Dissertations / Theses on the topic 'FEA'
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Spruegel, Tobias C., and Sandro Wartzack. "Das FEA-Assistenzsystem – Analyseteil FEdelM." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-215130.
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Die simulative Absicherung von Produkten in den frühen Phasen der Produktentwicklung wird immer wichtiger, um den Anforderungen nach steigender Effizienz gerecht zu werden. Da das Angebot an erfahrenen Berechnungsingenieuren mit langjähriger Berufserfahrung begrenzt ist gilt es weniger erfahrene Simulationsanwender bei der Durchführung von aussagekräftigen Finite-Elemente-Simulationen zu unterstützen. Die Autoren stellen im Rahmen des Beitrags das Konzept des Analyseteils FEdelM eines FEA-Assistenzsystems vor, welches strukturmechanische Finite-Elemente (FE) Simulationen auf Plausibilität überprüft und auftretende Fehler möglichst automatisiert zu erkennt und behebt. Hierbei werden die einzelnen Module und deren Verknüpfungen untereinander und zu anderen Anwendungen vorgestellt.
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Elgström, Eskil. "Practical implementation of hyperelastic material methods in FEA models." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-5654.
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This thesis will be focusing on studies about the hyperelastic material method and how to best implement it in a FEA model. It will look more specific at the Mooney-Rivlin method, but also have a shorter explanation about the different methods. This is due to problems Roxtec has today about simulating rubber takes long time, are instable and unfortunately not completely trustworthy, therefore a deep study about the hyperelastic material method were chosen to try and address these issuers. The Mooney-Rivlin method (which is a part of the hyperelastic material method) is reliant on a few constant to represent the material, how to obtain these constants numerical and later implement these is suggested in this thesis as well. The results is the methodology needed to obtain constants for Mooney-Rivlin and later how to implement these in FEA software. In this thesis the material Roxylon has been studied and given suggestion on these constants as well as an implementation of the given material.För en bra simulering utav hyperelastiska material, exempelvis för gummi, har detta examensarbete fokuserat på att undersöka hyperelastiska material metoder och hur man kan implementera det i FEA program.
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Schatt, Nathan A. "Finite Element Modeling of Ultrasonic Wire Bonding on Polyvinyl Acetate-Nanocomposite Substrates." Case Western Reserve University School of Graduate Studies / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=case1396634471.
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Lin, Bingcan. "A new FEA modelling of porous solids." Available from the University of Aberdeen Library and Historic Collections Digital Resources, 2009. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=59600.
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Urskog, Thorbjørn Solvoll. "ANALYSE AV ALUMINIUMEKSTRUDERING VED EKSPERIMENTER OG FEA." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for produktutvikling og materialer, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-24544.
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Denne rapporten er sammensatt av to deler, og starter med et bredt teoretisk fundament om ekstrudering, i sær grad, foroverekstrudering. Det meste av teori er hentet fra boken «APPLIED METAL FORMING» skrevet av Henry Sigvart ValbergDet er tidligere gjennomført laboratorieeksperimenter ved NTNU, der stangekstrudering er blitt belyst dersom bærekanalen ikke er parallell. Dessverre eksisterer det ikke grundige eller gode rapporter om disse eksperimentene, slik at en del av denne oppgaven har vært å beskrive, samt rapportere hvilke testresultater som kom frem i disse eksperimentene. Under laboratorieeksperimentene fremkom det for to av fire tester et uventet mønster på ekstrudatet, såkalt bambooing. Det ble derfor interessant å se på om dette fenomenet også kom frem ved datasimuleringer. Modeller av matrisene er blitt konstruert og testet i programvaren DEFORM og sammenlignet med de tidligere laboratorieeksperimentene. Etter flere testforsøk var det mulig å se enkelte sammenhenger mellom presskraft og bambusmønsteret. Simuleringene viste at dersom bæreveggen er tilstrekkelig lang oppstår det luftlommer mellombærevegg og bolt. Dette fører til ujevn friksjon og lugging for stempelet. Slike luftlommer danner sannsynligvis bambusmønster på ekstrudatet I del to av denne rapporten er modellen fra prosjektoppgaven optimalisert. Siden den ikke kunne gjennomføres i prosjektoppgaven ble modellen endret, etter anbefaling fra SFTC, og retestet.Resultater fra undersøkelser, prøver og simuleringer er oppsummert og diskutert i eget kapittel. Rapporten er skrevet i Microsoft Word, de mest komplekse figurene er bygd i Microsoft NX 8.0, mens datasimuleringer er gjennomført i DEFORM 2D og DEFORM 3D versjon 10.1.2.
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Weerakoon, Prasad. "Multi-User Methods for FEA Pre-Processing." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3255.
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Collaboration in engineering product development leads to shorter product development times and better products. In product development, considerable time is spent preparing the CAD model or assembly for Finite Element Analysis (FEA). In general Computer-Aided Applications (CAx) such as FEA deter collaboration because they allow only a single user to check out and make changes to the model at a given time. Though most of these software applications come with some collaborative tools, they are limited to simple tasks such as screen sharing and instant messaging. This thesis discusses methods to convert a current commercial FEA pre-processing program into a multi-user program, where multiple people are allowed to work on a single FEA model simultaneously. This thesis discusses a method for creating a multi-user FEA pre-processor and a robust, stable multi-user FEA program with full functionality has been developed using CUBIT. A generalized method for creating a networking architecture for a multi-user FEA pre-processor is discussed and the chosen client-server architecture is demonstrated. Furthermore, a method for decomposing a model/assembly using geometry identification tags is discussed. A working prototype which consists of workspace management Graphical User Interfaces (GUI) is demonstrated. A method for handling time-consuming tasks in an asynchronous multi-user environment is presented using Central Processing Unit (CPU) time as a time indicator. Due to architectural limitations of CUBIT, this is not demonstrated. Moreover, a method for handling undo sequences in a multi-user environment is discussed. Since commercial FEA pre-processors do not allow mesh related actions to be undone using an undo option, this undo handling method is not demonstrated.
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Vareskic, Srdjan. "Utmattningsanalys av tryckkärl i enlighet med SS-EN 13445-3." Thesis, Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-28737.
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Detta examensarbete har utförts i samarbete med Fagerström Industrikonsult AB i Helsingborg. Fagerström Industrikonsult AB är ett ingenjörsföretag som har specialiserat sig på mekaniska och mekatroniska produkter inom flera branchområden. Ett av företagets tidigare projekt, som bland annat bygger på tryckbärande kärl och som kommer återanvändas för ett nytt projekt, är i behov av en uppdaterad analys mot utmattningsbrott.För att en tryckbärande utrustning skall kunna säljas och användas inom Europa, måste tillverkarna följa det Europeiska direktivet 97/23/EG, även kallat PED-direktiv. Detta direktiv sätter regler för konstruktion, tillverkning, märkning och kontroll. I Sverige finns denna beskrivning i Arbetsmiljöverkets författnings-samling (AFS 1999:4 2011). För att uppfylla alla de konstruktionsmässiga och tillverkningsmässiga krav på tryckkärlet som ställs i PED direktivet, så måste harmoniserade standarder användas. I detta arbete används tryckkärlsstandarden (SS-EN 13445-3: 2014) som sätter regler för design och verifiering av tryckbärande anordningar.Ett av projekten som finansierats av den Europeiska kommissionen, visade att 25% av alla tryckbärande anordningars haverier beror på utmattning. Tryckkärl är den typ av tryckbärande anordning, som är mest utsatt för skador orsakade av utmattning. Utmattningsbrott har varit känt sedan början på 1800-talet och man har länge studerat detta fenomen. Man har efter lång tids arbete hittat metodik för att ta fram analytiska modeller och prediktionstekniker samt säkra och noggranna livslängdsberäkningar för stålkonstruktioner. Fagerström Industrikonsult AB söker idag en metod för att utföra utmattningsanalys på tryckkärl i enlighet med tryckkärlsstandarden där linjärstatisk analys utförs med finita elementmetoden. Företaget eftersträvar också mer kunskap inom ämnet för att ge konstruktörerna bättre kännedom om utmattningsproblematiken samt ge möjlighet att redan i konstruktionsstadiet kunna sätta rimliga krav på tillverkning ur mekaniskt utmattningsperspektiv.This master thesis has been carried out in collaboration with Fagerström Industrikonsult AB in Helsingborg. Fagerström Industrikonsult AB is an engineering company, specialized in mechanical and mechatronic products across a wide range of industry segments. One of the company's previous project, which is among other sub-products based on pressurized vessels, and that will be reused for a new project, needs an updated analysis against fatigue failure.In order to sell or use a pressurized equipment in Europe, the manufacturers must comply with the European Directive 97/23/EC, also called PED-directive. This directive sets the rules for design, production, marking and inspections. In Sweden, this directive is described in “Arbetsmiljöverkets Författningssamling” (AFS 1999:4 2011). In order to meet all the design and manufacturing requirements for pressure vessels that are required by the PED Directive, it is required to use harmonized standards. In this thesis, pressure vessel standard (SS-EN 13445-3: 2014) is used, which sets the rules for design and verification of pressure vessel.One of the projects funded by the European Commission, showed that 25 % of all pressure equipment failure are caused by fatigue. Pressure vessel is one type of these pressure equipment, which is most vulnerable to damage caused by fatigue. Fatigue failure has been known since the beginning of 19th century and this phenomenon has been studied for a long time. Under this extensive period of time, methods have been succefully developed for analytical models and prediction techniques as well as safe and accurate life calculations for steel structures. Fagerström Industrikonsult AB is today seeking a method to perform fatigue analysis of pressure vessels in accordance with European pressure vessel standard, where the linear static analysis is performed using the finite element method. The company is also pursuing more knowledge of the subject so its designers have more understanding of fatigue phenomena in order to be able to set reasonable requirements during design stage for production and in order to prevent this phenomena.
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Prathan, Kanthee. "Optimization of sprue design for advanced investment casting through FEA analysis." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-50027.
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Investment casting is a complex manufacturing method with many challenges that must be solved before components of the right quality can be produced. TPC is a company that utilizes investment casting to produce a variety of products, lately the company has higher ambition in wanting to cast higher technical demanding component like heat resistant gas turbine blades. This requires a sprue that can control the filling process, by allowing the fallen stream of molten metal to enter the moulds cavity in a laminar manner. This study has implemented the product development process by (Ulrich, 2012) to develop the requested sprue. The primary support for this study is study material given by the company also known as "PMG running spreadsheet TPC" base on theory and equations from (Jolly, 2002), which is believed to have origin in sand casting manufacturing process. The project began with recreating the textbook model after establishing a number of control parameter such as critical velocity. Then simulation software Nova flow was used to evaluate the velocity and FEM in Solidworks to study if the dimension of the model can be directly use for investment casting process. The results show that it was not possible, therefore in the concept generating phase only theory of casting was used to create new concept. Then 3 existing sprues were chosen for benchmarking to gain deeper understanding about their design intension. One of the concepts was inspired by the CEO Mark Irwin “concentric pipe design” and in total 10 concepts were created of which 6 were tested for both flow and FEM analysis. 2 concepts were chosen for further development which also became 2 final concepts, after 3 iterations of improvement. These concepts show that many improve in terms of laminar filling and higher yield than the existing benchmark sprues. Although further development is required. The analysis shows that every step in the project has its own flaws, but that is the nature of being an engineer, as long as the problem encountered can be viewed with critical and analytical eyes. A well-considered and balanced solution can be provided, although nothing of this can be certain before a trail of test can provided to confirm any assumptions which is not included in this work. The discussion section processes the thoughts, experience, and doubts about the project in general and the decision making leading to this report and what could have been done differently. The most significant lesson learn from this is that section is when solving a complex issue there must be very clear delimitations and well-defined goals to every specific solution. Otherwise the workload will be extensive and cause more harm than necessary. The conclusion of this project shows that two concepts generated with the help from the product development process work better than the case study, which can be found in section 4.3, that was based on “PMG running spreadsheet TPC” calculation model, from the velocity perspective. To achieve this, the sprue uses its own geometry constrain and constricts the flow by collecting the molten metal in a “well” before the calmer stream could be distributed throughout the whole cavity. Indirectly this means that the studied material given from TPC AB could not be directly implemented into the investment production process. The given material should be seen as a complement and guidance when creating new sprues. Concerning the FEM analysis tool, it was helpful in this project in evaluating the sprues geometry expose to the assumed force in the production process to avoid unnecessary failure and therefore waste. Although if the company do not intend further work with the development of other sprues then this method is not necessary and would not have significant value to their current manufacturing process.
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Koskenranta, Mikael. "Optimisation of ceiling attachment for AVPOS using FEA." Thesis, Högskolan i Skövde, Institutionen för teknik och samhälle, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-11143.
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In product manufacture and assembly it is important to lower materials usage and assembly timewhile retaining a safety margin against structural failure. In this project the ceiling attachment of theAVPOS offloading arm is redesigned based on objectives identified by Löfs Specialmaskiner. Theoriginal ceiling attachment is analysed using finite element analysis to identify any structuralweaknesses to be addressed during redesign. Based on information gained during the FEA threeconcepts are generated and rated based on their estimated assembly times, material usage, partscount and the cutting length for machining.One concept is selected for further topology optimisation and iterative FEA, where material isremoved from the selected concept design while maintaining safety objectives. The optimised designdeveloped during this project is shown to have a lower number of parts, lower usage of material andassembly time while retaining an overall FOS value of 4.In addition to redesigning the ceiling attachment, alternative bearings are also investigated whichchanges the existing ball bearings to a self-aligning sliding bearing with self-lubricating properties,lowering the machining tolerances as well as lowering the needs for service.This project contributes to lowering material usage and ease of assembly in the product AVPOS thatis manufactured by Löfs Specialmaskiner. The redesigned ceiling attachment along with thesuggested bearings will likely simplify future manufacturing as well as lower any concerns for damageto people and property as a result of structural failure.
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Lim, Chee Wang. "Dynamic analysis of aerostatic guideway and FEA model development." Thesis, Cranfield University, 2009. http://dspace.lib.cranfield.ac.uk/handle/1826/4485.
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A dynamically optimal design is essential for a motion system to perform high speed operation without compromising its accuracy, settling time and vibration specification. Good design practice which accounts for dynamic characteristics in the modelling of a motion system warrants higher performance precision machines and cuts down redevelopment effort to ‘patch’ inherent shortcoming of the machine dynamics. This research aimed to accurately describe the non-linear dynamics of a non-mechanical contact aerostatic guideway system in order to achieve an accurate FEA model of the design stage. The single axis aerostatic guideway is comprised of several machine in¬terfaces that impact the dynamic behaviour of the guideway. Modelling each air bear¬ing pad by a single stiffness element is not adequate to predict the guideway modal behaviour accurately. The aerostatic guideway has been broken down into several key machine interface elements. In-depth investigation of the air film and the air bearing mounting mechanism was carried out. A dedicated air film test rig was designed and built to acquire insight of the air film dynamic characteristics. It is observed that the mounting mechanism of the air bearing constitutes to a signifi-cant dynamic effect to the entire air bearing setup. Based on the findings of the mount-ing mechanism’s stiffness properties, a method was developed to estimate ‘true’ air gap heights which cannot be easily assessed and measured directly in most aerostatic guideway carriages. The estimation method enables a more rigorous FE model of the aerostatic guideway system. The comprehensive dynamic analysis methodology pro-posed in this research greatly increases the confidence and accuracy of the aerostatic guideway’s FE model.
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Haas, Trevor Neville. "Numerical (FEA) evaluation of crane end buffer impact forces." Thesis, Lilnk to the online version, 2007. http://hdl.handle.net/10019/633.
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Maan, Franz Sanderson. "Extension and development of the fixed grid FEA method." Thesis, University of Leeds, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.511135.
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Bhamidipati, Prasanna Subbarao. "FEA ANALYSIS OF NOVEL DESIGN OF CYLINDRICAL ROLLER BEARING." Cleveland State University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=csu1324152802.
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Goller, Daniel, Christian Glenk, and Frank Rieg. "Entwicklung und Implementierung einer Finite-Elemente-Software für mobile Endgeräte." Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-172479.
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Cheng, Wan. "Large deformation nonlinear FEA and applications for metal forming processes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1995. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/NQ42732.pdf.
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McGee, Caleb. "NUMERICAL EVALUATION OF ADHESIVE JOINTS IN COMPOSITE STRUCTURES USING FEA." OpenSIUC, 2015. https://opensiuc.lib.siu.edu/theses/1743.
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The increasing use of composite materials in many industries such as aerospace, automotive, and civil industries has increased the need for the development of effective techniques to detect defects in the bondlines of adhesive joints in composite structures. Currently, composite structures used in commercial applications such as modern aircraft use mechanical fasteners in redundancy to adhesive bonds to ensure structural integrity due to a lack of methods to reliably detect defects in the bondline of composite structure. As such, this thesis facilitates the development of nondestructive evaluation techniques for detecting bondline defects by using finite element (FE) modeling to simulate the effects of disbond defects caused by contamination of the bondline. These models were developed for single-lap joint specimens made of metal, composite, and dissimilar materials (metal bonded with composite) with contamination induced disbonds. The created FE models were used to generate whole-field strain data for single-lap joints under tensile loading. This generated strain data was then used to provide a model for evaluating and interpreting experimental strain measurements captured by digital image correlation (DIC). Finally, conclusions were drawn outlining the observed capability of strain measurement in the evaluation of bondline contamination in single-lap joints.
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Gustafsson, Anton, and Mario Zivkovic. "Metodikutveckling och optimering av lankarm i hogprestandafordon genom FEA och Reverse Engineering." Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-23391.
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Med strängare krav på miljöpåverkan och en konstant efterfrågan på högre prestanda är optimering en essentiell del av vår vardag. Genom korrekt arbetsmetodik och optimering kan den växande efterfrågan på både prestanda och minskad miljöpåverkan överträffas. Att utveckla ett optimalt koncept av en länkarm hos en prestandabil är ett konkurrenskraftigt steg med stor betydelse. Genom att i ett tidigt skede i produktutvecklingsprocessen kunna skapa en optimal design minskar risken för stora kostnader på grund av ändringar i de senare faserna och bidrar således till en ökad lönsamhet. Att utnyttja Finita Elementmetoden som en del av en CAE driven produktutvecklingsprocess är således en utmärkt väg att gå och bidrar starkt till ändamålet genom att lösa avancerade problem med en simpel och adaptiv metodik. Bilindustrin präglas av innovativa och effektiva lösningar där både FEM och RE är välkända metoder. Projektet ska upplysa innebörden av en strukturerad arbetsmetodik vid optimering genom implementering av ett flertal produktutvecklingsfilosofier kombinerat med FEM/FEA. Genom att optimera en länkarm från en Audi R8 Coupé V10 quattro tillämpas och utvecklas välfungerade och starkt begrundade metoder. Produktutvecklingsfilosofier såsom Reverse Engineering och ett iterativt arbetssätt resulterade i en förbättrad länkarm med lägre vikt såväl som minskade spänningar och deformation. En viktminskning på 22%, en spänningsminskning på 47% och en minskad teoretisk elastisk deformation på 33% uppnåddes. Utöver dessa förbättringar ökade även robustheten med 25%.With harsher regulations of environmental impact combined with a consistent demand on increased performance, optimization becomes an essential part of our everyday lives. Through a well-developed methodology and optimization process, the tougher demands of both performance and environmental impact could be exceeded. Developing an optimal concept of a control arm in a high-performance vehicle application is a competitive step of great importance. By creating an optimal design in early development stages of the product development process, the economic impact could be minimized. This therefore leads to an increase in profitability. Involving the Finite Element Method as a part of the product development process is therefore an excellent path toward solving advanced problems through a simple and adaptive work methodology. The automotive industry is characterized by innovative solutions where both the Finite Element Method and Reverse Engineering are well-known methods. The project has a foundation that strongly represents the meaning of a systematical optimization methodology through various product development philosophies combined with FEM/FEA. Through optimization of a control arm from an Audi R8 Coupé V10 quattro proved and well-grounded methods are applied and further developed. Product development philosophies such as Reverse Engineering and an iterative work process resulted in an improved control arm with lower weight as well as decreased stresses and deformation. A weight loss of 22%, stress reduction of 47% and a reduced theoretical elastic deformation of 33% was achieved. Beyond these improvements an increased robustness of 25% was achieved.
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Touma, Johannes, and Simon Kasselia. "Konstruktion av upphängningsanordning till T22 provrigg." Thesis, KTH, Hållbar produktionsutveckling (ML), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-276725.
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Detta examensarbete går ut på att konstruera en upphängningsanordning för en provrigg på Scania. Scania har i dagsläget ett flertal olika provriggar, en provrigg de har är T22. Syftet med detta arbete är att utveckla en fixtur som har egenskapen att stödja en tung växellåda så den utgående axeln på växellådan kan provas i provriggen T22. Metoden som används för denna utveckling består av flera moment där den första delen är att mäta nuvarande mått på växellådan och modellera en fixtur med hjälp av de mått som tagits i CAD-programmet CATIA. Därefter kan fixturen som konstruerats i CATIA sammanställas ihop med växellådan för att se om dimensionerna stämmer. När sammanställningen har genomförts kan mekaniska analyser utföras och sedan avslutas med tester. Resultatet av projektet blev en upphängningsanordning som monteras på Scanias växellådor som i sin tur kopplas ihop med provrigg T22. Scanias befintliga komponenter som lyftbalk och cirkulär konsol användes och kompletterades med armar som möjliggör att montera växellådan bakifrån i provrigg T22. Av det här resultatet kan vi dra slutsatsen att Scania kan montera fixturen på de allra flesta GW växellådorna och utföra mätningar via provriggen T22.This thesis is about designing a suspension device for a test rig at Scania. Scania currently has several different test rigs, one test rig they have is T22. The purpose of this work is to develop a fixture that has the property of supporting a large gearbox so that the output shaft of the gearbox can be tested in the test rig T22. The method used for this development consists of several parts where the first part is to measure the current dimensions of the gearbox and then create a fixture in the CAD program CATIA V5 adapted to the dimensions taken before on the gearbox. Then the fixture constructed in CATIA V5 can be assembled with the gearbox to check if the dimensions are correct and fits together. Once the compilation has been completed, mechanical analyzes can be performed and then conclude with tests.The result of the project was a suspension device that is mounted on Scania's gearboxes which in turn are connected to test rig T22. Scania's existing components such as lifting beam and circular adapter were used and supplemented with arms that allow the gearbox to be mounted from behind in test rig T22.From this result we can conclude that Scania can mount the fixture on most GW gearboxes and perform measurements using the test rig T22.
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Ferranto, Justin. "Experimental characterization and FEA simulation of hyperelastic membranes under large deformation." abstract and full text PDF (free order & download UNR users only), 2005. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1436029.
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Haas, Andreas. "Production integrity for hydroforming and preceding forming process using FEA techniques." Thesis, University of Wolverhampton, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369651.
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Kestel, Philipp, and Sandro Wartzack. "Wissensbasierter Aufbau konstruktions-begleitender Finite-Elemente-Analysen durch ein FEA-Assistenzsystem." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-215029.
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Aus der Einleitung:
"Aufgrund der wachsenden Produktanforderungen bei gleichzeitig immer kürzeren Entwicklungszeiten gewinnen computergestützte Simulationsverfahren, wie die Finite-Elemente-Analyse (FEA), in der Produktentwicklung zunehmend an Bedeutung [Müller 2009]. Für eine effiziente Nutzung der FEA muss diese jedoch frühzeitig in der Produktentwicklung angewendet werden. Darüber hinaus wird für einen erfolgreichen Einsatz umfangreiches Expertenwissen vorausgesetzt. Dieses Wissen konzentriert sich in den Unternehmen hauptsächlich auf erfahrene Berechnungsingenieure, die aufgrund zeitlicher Engpässe Simulationen meist nur zur Nachrechnung bereits ausdetaillierter Produktmodelle durchführen. Konstruktionsbegleitende Simulationen werden hingegen zu selten eingesetzt oder sind nicht aussagekräftig genug, wenn diese nicht von Berechnungsexperten erstellt werden. Um den steigenden Anforderungen an die Produktentwicklung gerecht zu werden, muss das erforderliche Simulationswissen daher auch weniger erfahrenen Benutzergruppen, wie Konstruktionsingenieuren, zugänglich gemacht werden. Darüber hinaus müssen wiederkehrende Arbeitsschritte für den Simulationsaufbau standardisiert und automatisiert werden, um die Qualität der Berechnungsergebnisse abzusichern und diese Prozesse zu beschleunigen. ..."
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Kestel, Philipp, and Sandro Wartzack. "Wissensbasierter Aufbau konstruktionsbegleitender Finite-Elemente-Analysen durch ein FEA-Assistenzsystem [Präsentationsfolien]." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-214044.
Full textAbstract:
Motivation
- Steigende Produkt- und Prozessanforderungen bei gleichzeitig verkürzten Entwicklungszeiten
- Verstärkter Einsatz von Finite-Elemente-Analysen (FEA) in der Produktentwicklung notwendig
- Erforderliches Expertenwissen jedoch hauptsächlich auf erfahrenen Berechnungsingenieure konzentriert
- Konsturktionsbgleitende FEA bisher zu selten durchgeführt oder zu wenig aussagekräftig
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Qian, Cheng. "Simulation of Mechanical Shock with Finite Element Analysis and Estimation of Shock Attenuation." Thesis, KTH, Hållfasthetslära, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-294549.
Full textAbstract:
Space equipment is often subjected to mechanical shocks. Some devices like electronics are sensitive to shocks, and they can easily be damaged. To protect these devices, it is important to study shock penetrations in space structures. The Finite Element Method is an effective tool to simulate response to transient excitations. Unlike Statistical Energy Analysis (SEA) which can ensure sufficient accuracy in high frequency range, Finite Element Analysis (FEA) is limited to low frequency range, but has no spatial restrictions. In this thesis, Tuma’s digital filter method and Irvine’s recursive digital method were combined to calculate the Shock Response Spectrum (SRS). FEA models based on a given experimental system, i.e., shock table were used to predict the structural response to Haversine shaped forces. The modal transient structural analysis in ANSYS Workbench was used as the solver. Transient analysis based on modal results neglects material and structural non-linearities, so it uses less memory and computation time. FEA and the Bernoulli beam equation were employed to simulate the shock response of cantilever beams and fixed-pinned beams to validate the FEA models. SRS calculated from FEA results were compared with those from the beam equation results. Almost no difference between Bernoulli beam equation results and FEA results for thin beams reveals that the FEA models were validated. The SRS of two beam models calculated from FEA using solid elements were compared with those using beam elements. The results from two different element types are almost consistent with each other. Response at different positions on the shock table were measured to predict the shock attenuation. The attenuation was described in the way of remaining percentage from shock source, and the curve from FEA simulation roughly agreed with the attenuation rule from the ESTEC database.Rymdutrustning utsätts ofta för mekaniska stötar, s.k. mekanisk chock. Vissa enheter, som elektronik, är känsliga för stötar och de kan lätt skadas. För att skydda dessa enheter är det viktigt att studera chockdämpningen i rymdstrukturer. Finita elementmetoden är ett effektivt verktyg för att simulera responsen vid transienta excitationer. Till skillnad från statistisk energianalys (SEA) som kan säkerställa tillräcklig noggrannhet i högfrekvensintervall, är finit elementanalys (FEA) begränsad till lågt frekvensområde, men har inga rumsliga begränsningar. I detta examensarbete kombinerades Tumas digitala filtermetod och Irvines rekursiva digitala metod för att beräkna Chockresponsspektrum (SRS). FEA-modeller baserade på ett givet experimentellt system, d.v.s. chockbord, användes för att förutsäga den strukturella responsen på Haversine-formade krafter. Den modala transienta strukturanalysen genomfördes med ANSYS Workbench. Den transienta analysen baserad på modala resultat försummar icke-linjäriteter i material och struktur för att använda mindre minne och förkorta beräkningstiden. FEA och Bernoulli-balkekvationen användes för att simulera chockresponsen av konsolbalkar och balkar med fast inspänning i ena änden och fri uppläggning i den andra änden, för att validera FEA-modellerna. SRS beräknat från FEA-resultaten jämfördes med resultat från balkekvationen. Ingen avgörande skillnad noteras mellan Bernoullis balkekvationsresultat och FEA-resultat för tunna balkar, vilket validerar FEA-modellerna. SRS för två balkmodeller beräknade från FEA med solida element jämfördes med de som använde balkelement. Resultaten från de två olika elementtyperna överensstämmer mycket bra. Responsen vid olika positioner på chockbordet mättes för att förutsäga chockdämpningen. Chockdämpningen beskrivs som kvarvarande procent av responsen vid chockkällan och kurvan från FEA-simulering överensstämde ganska bra med tumregeln för chockdämpning från ESTEC-databasen.
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Dai, Yang. "Feedback Control of Multi-Story Structures under Seismic Excitations." Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/26742.
Full textAbstract:
This dissertation studies the feedback control of the dynamic response of multi-story structures to seismic excitations. The seismic excitations are represented by arbitrary unknown stochastic disturbances. The research consists of modeling of the structure with a control system and a control design in the state space. A combination of the extended Hamilton's principle and the Hierarchical Finite Element Method (HFEM) was used to derive the discrete differential equations of motion. This method exhibits superior accuracy with fewer degrees of freedom (DOF). The discrete equation were realized in the state space, where the Multiple Channel Control (MCC) model, the Single Channel Control (SCC) model and the Special Single Channel Control (SSCC) model were proposed. The MCC model is a general multiple input/multiple output (MIMO) dynamic system; the SSCC model is a single input/multiple output (SIMO) dynamic system; which requires only one actuator acting on the base; the SCC model has duality. On one hand, the system can be classified as MIMO when control actuators are regarded as the input. On the other hand, it can be regarded as a SIMO system when control signal as the input.
Moreover, three different types of control methodologies, the Linear Quadratic Gaussian (LQG) control, the Disturbance Accommodating Control (DAC), and the hybrid LQG/DAC approaches, were successfully developed to actively mitigate the vibration of the multi-story structures subjected to the seismic disturbance. In addition, the Kalman filter was used as an optimal observer to estimate the state of the system in the LQG and the LQG/DAC design.
Finally a numerical simulation of a four-story structure was carried out under nine cases. The cases covered various combinations of the three models and the three control designs to verify the effectiveness of control technique developed in this study. The simulation results found were quite encouraging. The results show each combination has its preponderance corresponding to special priority. In general, the hybrid LQG/DAC control in conjunction with the SSCC model is the best choice.Ph. D.
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Kenningley, Scott David Peter. "High temperature thermal and mechanical load characterisation of a steel fibre reinforced aluminium metal matrix composite (AlMMC) for automotive diesel pistons." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/high-temperature-thermal-and-mechanical-load-characterisation-of-a-steel-fibre-reinforced-aluminium-metal-matrix-composite-almmc-for-automotive-diesel-pistons(5cc789fc-d64e-4905-bc1c-beb0e3b9c0df).html.
Full textAbstract:
In modern automotive engines, the vast majority of light vehicle diesel (LVD) pistons are made from gravity die cast monolithic AlSi based alloy systems. Presently, the market drivers for reduced emissions, more efficient fuel consumption and increased specific power output are providing cyclic thermal and mechanical fatigue loading above the safe life durability threshold for the current AlSi based alloy systems. Peak temperatures in the diesel piston’s fatigue critical combustion bowl region are presently 420 °C for the AlSi based alloys, which represents a homologous TH value in excess of 0.8. In combination with peak temperatures of 420 C, the pistons are subject to cylinder pressures up to 220 bar, inducing mechanical stress amplitudes 15-20% greater than the allowable component fatigue strength for 1x108 cycles, in some applications. This durability deficit naturally leads to a requirement for new material and process solutions aimed at improving thermal and mechanical fatigue resistance at temperatures in excess of 420 C.One solution to this problem is to locally reinforce the pistons combustion bowl edge with a metal matrix composite (MMC) system. In this study, an aluminium based metal matrix composite (AlMMC) has been investigated and has shown some promise with increases in iso-thermal high cycle (1x 107) fatigue strength of 50 % compared to standard monolithic piston alloys. The AlMMC consists of a premium AlSi based LVD piston alloy matrix reinforced with 0.15 Vf of an interconnected network of 2-4 mm long Fe based fibres. The AlMMC is manufactured by pressure assisted infiltration of a sintered metallic fibre preform with as cast materials having a pore density of 0.2 %. In contrast to the use of ceramic fibre reinforcement systems generally requiring high pressure infiltration techniques, preform infiltration is considered possible with a comparably inexpensive manufacturing route. The Fe based fibre preforms can be infiltrated at lower pressure due to the reactivity between the Fe based fibres and the AlSi based matrix alloy. Unfortunately, this increased reactivity, although an advantage for preform infiltration, can result in (FeAlXX)Si(+X) interfacial reaction products forming between the fibre and matrix at operating temperatures of greater than 440 °C. These interfacial reactions result in a 15-20 m interfacial intermetallic layer after prolonged periods of exposure (>500 hrs), resulting in depleted fibre Vf and void formations on the matrix side of the interface.
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Bail, Justin L. "Non-desctructive investigation & FEA correlation on an aircraft sandwich composite structure." Akron, OH : University of Akron, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=akron1196702586.
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Thesis (M.S.)--University of Akron, Dept. of Civil Engineering, 2007."December, 2007." Title from electronic thesis title page (viewed 02/25/2008) Advisor, Wieslaw Binienda; Faculty readers, Craig Menzemer, Robert Goldbert; Department Chair, Wieslaw Binienda; Dean of the College, George K. Haritos; Dean of the Graduate School, George R. Newkome. Includes bibliographical references.
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Liu, Hongquan. "Ply clustering effect on composite laminates under low-velocity impact using FEA." Thesis, Cranfield University, 2012. http://dspace.lib.cranfield.ac.uk/handle/1826/7310.
Full textAbstract:
With the development of the design and manufacture technology, composite
materials are widely used in the aeronautical industry. But, one of the main
concerns which affects the application of composites is foreign object impact.
The damages induced by the Low Velocity Impact (LVI), which can significantly
reduce the strength of the structures, can’t be easily inspected routinely. The
so-called Barely Visible Impact Damages (BVID) due to LVI typically includes
interlaminar delamination, matrix cracks and fibre fracture at the back face.
Previous researches have shown that the results of LVI test are similar to that of
the Quasi-Static Load (QSL) test. The initiation and propagation of delamination
can be detected more easily in the QSL test and the displacement and reaction
force of the impactor can be controlled and measured much more accurately.
Moreover, it is easier to model QSL tests than dynamic impacts.
To investigate the impact damage induced by LVI, a Finite Element (FE) model
employing cohesive elements was used. At the same time, the ply clustering
effect, when several plies of the same orientation were stack together, was
modelled in the FE model in terms of damage resistance and damage size. A
bilinear traction-separation law was introduced in the cohesive elements
employed to simulate the initiation and propagation of the impact damage and
delamination.
Firstly, a 2D FE model of the Double Cantilever Beam (DCB) and End Notched
Flexure (ENF) specimens were built using the commercial FEM software
ABAQUS. The results have shown that the cohesive elements can be used to
simulate mode I and mode II delamination sufficiently and correctly.
Secondly, an FE model of a composite plate under QSL but without simulating
damage was built using the continuum shell elements. Agreement between the
FEA results with published test results is good enough to validate the capability
of continuum shell elements and cohesive elements in modelling the composite
laminate under the transverse load condition (QSL). Thirdly, an FE model containing discrete interface delamination and matrix
cracks at the back face of the composite plate was built by pre-setting the
cohesive failure elements at potential damage locations according to the
experimental observation. A cross-ply laminate was modelled first where fewer
interfaces could be delaminated. Good agreement was found in terms of the
delamination area and impactor’s displacement-force curve.
Finally, the effect of ply clustering on impact damage resistance was studied
using Quasi-Isotropic (QI) layup laminates.
Because of the limited time available for calculation, the simulation was only
partly completed for the quasi-isotropic laminates (L2 configuration) which have
more delaminated interfaces. The results showed that cohesive elements
obeying the bilinear traction-separation law were capable of predicting the
reaction force in quasi-isotropic laminates. However, discrepancies with the test
results in terms of delamination area were observed for quasi-isotropic
laminates. These discrepancies are mainly attributed to the simplification of
matrix cracks simulation and compressive load at the interface in the thickness
direction which is not taken into account.
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Gregefors, Carl. "Correlation study between FEA and physical testing for a hypoid gear set." Thesis, KTH, Hållfasthetslära (Inst.), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-190100.
Full textAbstract:
This thesis describes a correlation study of gear tooth bending stresses between physical testing and Finite Element modelling. It was conducted after a discovery at GKN that there were inconsistencies between the measured and calculated tooth root stresses for a hypoid gear set. The aim of the thesis was to investigate to what extent the stresses are correlated and if the program used is reliable for bending stress calculation. This would then be used to create S/N-curves for the gear set. The correlation was studied for several different aspects of the gear set. The contact pattern for the gear set was compared visually for a range of torque levels to see how well they matched and if this would contribute to the discrepancy. The root bending stress had been measured using a number of strain gauges in the root of the teeth. The location of these strain gauges was measured using a digital microscope and coordinate-measuring machine and the strain in the corresponding location in the Finite Element model was evaluated. The calculated contact pattern showed a slight under-approximation for lower torque levels but the agreement increased with increasing torque levels. The stress showed good correlation in the highly stressed middle area of the tooth for both the pinion and the ring gear while the lowly stressed heel and toe were worse. As the maximum stress is the deciding factor for bending fatigue the program was deemed reliable and the results used to evaluate fatigue life for the gear set.Detta examensarbete beskriver en korrelationsstudie för böjspänningen i kuggrötter där finita element-simuleringar jämförs med fysiska testresultat. Korrelationsstudien utfördes då GKN upptäckte att det var inkonsekvent överensstämmelse mellan uppmätta och beräknade böjspänningar i kuggroten i en hypoidkuggväxel. Syftet var således att säkerställa till vilken grad spänningarna var korrelerade och om det program som använts är pålitligt vad gäller böjspänningsberäkningar. Ett flertal aspekter undersöktes i korrelationsstudien. En okulär jämförelse mellan det den beräknade och den uppmätta kontaktarean gjordes för ett intervall av momentnivåer för att fastställa hur väl de stämde och för att se om det kunde bidra till diskrepansen i spänningsjämförelsen. Böjspänningen mättes i testet med ett antal trådtöjningsgivare monterade i kuggroten. Dessa givares position mättes upp med hjälp av ett digitalt mikroskop och en koordinatmätningsmaskin. Samma spänning mättes sedan upp i motsvarande område i den finita element-modellen. Den uppmätta kontaktarean var något underskattad för låga momentnivåer men vid högre nivåer var korrelationen god. I områden med hög böjspänning i kuggroten var korrelationen mellan test och simulering god. I kuggtändernas tå och häl var korrelationen sämre. Då det intressanta området är det med hög spänning ansågs programmet var tillräckligt exakt för att användas för att skapa utmattningsdiagram från testdata.
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Bail, Justin. "Non-Destructive Investigation & FEA Correlation on an Aircraft Sandwich Composite STructure." University of Akron / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=akron1196702586.
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Bidkar, Niraj Sudhir. "Prediction of slip systems in notched FCC single crystals using 3D FEA." [Gainesville, Fla.] : University of Florida, 2003. http://purl.fcla.edu/fcla/etd/UFE0000645.
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TAVARES, V. G. B. "Nom quer eu donzela fea: misoginia nas cantigas satíricas de Afonso X." Universidade Federal do Espírito Santo, 2018. http://repositorio.ufes.br/handle/10/9222.
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Previous issue date: 2018-02-28RESUMO Estuda as personagens femininas nas cantigas satíricas de Afonso X (1221-1284), rei de Castela e Leão e trovador, fundamentando-se em estudos interdisciplinares: filológicos, crítico-literários, historiográficos e filosóficos. Aborda os discursos clericais, jurídicos e filosóficos da Antiguidade e Idade Média que consolidaram a tradição misógina ocidental e engendraram a condição social das mulheres entre os séculos XII e XIV, identificando os modelos estéticos e comportamentais prescritos para as nobres e plebeias. Por meio da investigação de critérios sociais relativos à beleza e feiura, reconhece a fealdade feminina como um dos motivadores do riso no escárnio e maldizer galego-português, observando algumas estratégias poético-retóricas empregadas pelos trovadores para a descrição de senhoras, velhas e soldadeiras e de suas particularidades físicas e morais condenadas pelos paradigmas vigentes no medievo. Diante disso, constata que as cantigas satíricas produzidas por Afonso X, embora voltadas para o entretenimento, configuram-se igualmente como uma literatura que, ao apontar o desajuste das satirizadas aos modelos de beleza e conduta prescritos para as mulheres, tornava-se um meio de difusão e manutenção da misoginia medieval, isto é, dos discursos essencialistas que promoveram o apagamento social e histórico do gênero feminino. Palavras-chave: Sátira galego-portuguesa Afonso X. Cantigas de escárnio e maldizer Afonso X. Feiura feminina Tema literário. Misoginia medieval na poesia.
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Taran, Narges. "Optimum Design of Axial Flux PM Machines based on Electromagnetic 3D FEA." UKnowledge, 2019. https://uknowledge.uky.edu/ece_etds/145.
Full textAbstract:
Axial flux permanent magnet (AFPM) machines have recently attracted significant attention due to several reasons, such as their specific form factor, potentially higher torque density and lower losses, feasibility of increasing the number of poles, and facilitating innovative machine structures for emerging applications. One such machine design, which has promising, high efficiency particularly at higher speeds, is of the coreless AFPM type and has been studied in the dissertation together with more conventional AFPM topologies that employ a ferromagnetic core.
A challenge in designing coreless AFPM machines is estimating the eddy current losses. This work proposes a new hybrid analytical and numerical finite element (FE) based method for calculating ac eddy current losses in windings and demonstrates its applicability for axial flux electric machines. The method takes into account 3D field effects in order to achieve accurate results and yet greatly reduce computational efforts. It is also shown that hybrid methods based on 2D FE models, which require semi-empirical correction factors, may over-estimate the eddy current losses. The new 3D FE-based method is advantageous as it employs minimum simplifications and considers the end turns in the eddy current path, the magnetic flux density variation along the effective length of coils, and the field fringing and leakage, which ultimately increases the accuracy of simulations.
After exemplifying the practice and benefits of employing a combined design of experiments and response surface methodology for the comparative design of coreless and conventional AFPM machines with cores, an innovative approach is proposed for integrated design, prototyping, and testing efforts. It is shown that extensive sensitivity analysis can be utilized to systematically study the manufacturing tolerances and identify whether the causes for out of specification performance are detectable.
The electromagnetic flux path in AFPM machines is substantially 3D and cannot be satisfactorily analyzed through simplified 2D simulations, requiring laborious 3D models for performance prediction. The use of computationally expensive 3D models becomes even more challenging for optimal design studies, in which case, thousands of candidate design evaluations are required, making the conventional approaches impractical. In this dissertation a new two-level surrogate assisted differential evolution multi-objective optimization algorithm (SAMODE) is developed in order to optimally and accurately design the electric machine with a minimum number of expensive 3D design evaluations.
The developed surrogate assisted optimization algorithm is used to comparatively and systematically design several AFPM machines. The studies include exploring the effects of pole count on the machine performance and cost limits, and the systematic comparison of optimally designed single-sided and double-sided AFPM machines. For the case studies, the new optimization algorithm reduced the required number of FEA design evaluations from thousands to less than two hundred.
The new methods, developed and presented in the dissertation, maybe directly applicable or extended to a wide class of electrical machines and in particular to those of the PM-excited synchronous type. The benefits of the new eddy current loss calculation and of the optimization method are mostly relevant and significant for electrical machines with a rather complicated magnetic flux path, such is the case of axial flux and of transvers flux topologies, which are a main subject of current research in the field worldwide.
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Ulfberg, Adrian. "Probabilistic non-linear finite element analysis of concrete buttress dams." Thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-72701.
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Assessment of concrete buttress dams today consists of using analytical methods to investigate the stability in different failure modes. However, they simplify the problem at hand and neglect certain important features linked to geometry and thus not truthfully appraise the structures real stability. This could be economically costly in assessments of both existing dam structures as this would eventually lead to unwarranted rehabilitation. The same can be said for dams under design. Kalhovd dam is a concrete buttress dam that has recently undergone assessment where certain sections proved unstable in either failure mode. This study focused specifically on a buttress, numbered 49, of said dam which was deemed in the assessment to be unstable in the overturning and sliding failure mode. The methodology used was to assess and compare stability for different methods of calculation, meaning analytical versus numerical analysis. The numerical analysis was performed with two-dimensional finite element analyses in a commercial FEM-software called ATENA which focuses on reinforced concrete structures. The numerical models made, were then probabilistically analysed by randomizing various material parameters to see their effect on stability. Some FEA models discarded the conventional way of modelling loads, as required by standards, to more realistically portray load actions on dams based on historical measurement. Results from this study showed dissimilarity of stability for buttress 49 depending on which method of analysis was performed. Analytical methods proved to yield the most conservative results and concluded the structure unsafe, while including an accurate representation of the geometry in FEA models improved the stability such that it can be considered stable against load actions stated in guidelines. Furthermore, material parameters randomized in the probabilistic analysis substantiated that various concrete variables had relatively little effect on structural overall strength in the most common failure modes.
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PADUR, DIVYACHAPAN SRIDHARAN. "DEVELOPMENT AND TESTING OF AN ENHANCED PREPROCESSOR FOR CREATING 3D FINITE ELEMENT MODELS OF HIGHWAY BRIDGES AND A POST PROCESSOR FOR EFFICIENT RESULT GENERATION." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1078472870.
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Di, Nicola Felice. "Decommissioning of an offshore platform as a wind turbine support by using digital twin." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022.
Find full textAbstract:
The aim of the research project is the decommissioning of an existing oil and gas platform located in the Adriatic Sea and the re-utilization of the three-legs jacket as wind turbine support
The project consists of two main phases.
In the first phase, the existing structure, the oil and gas platform, is examined through the structural analysis using an RB-FEA software considering the in-place loads applied. Further, the fatigue analysis is performed in order to assess the resistance of the structure respect the long terms environmental actions caused by waves.
In the second phase, the top side, hence the transition piece and the deck, is decommissioned and replaced by a wind turbine using the jacket as a basement. As already done in the first phase, the resistance of the jacket is assessed through the structural analysis and the fatigue analysis
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Warnert, Steven Paul. "Design and Analysis of the Impact Diffusion Helmet Through a Finite Element Analysis Approach." DigitalCommons@CalPoly, 2016. https://digitalcommons.calpoly.edu/theses/1669.
Full textAbstract:
By applying the finite element approach to the design and analysis of the impact diffusion helmet, many helmet configurations were able to be analyzed. Initially it was important to determine what design variables had an influence on the impact reducing abilities of the helmet design. The helmet was run through a series of Abaqus simulations that determined that a design with two oval shaped channels running along the length of the helmet was best. Next, these options were optimized to generate the helmet that produced the greatest impact reduction. The optimization simulations determined that a helmet that pushed the channels as far from the impact zone as possible reported the lowest acceleration. This indicated that removing the channels from play was most advantageous from an impact reduction perspective. Finally, a 3-D printed experimental helmet was impact tested and compared to a 3-D printed control helmet. The experimental helmet brought the channels back into the impact zone in order to judge if they had a physical effect on the acceleration. Both the simulations and the subsequent physical testing indicated that the Impact Diffusion Helmet design has a negative influence on the concussion reducing properties of a football helmet.
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Larsson, Jesper. "Spring Element Evaluation Using Finite Element Analysis." Thesis, Högskolan i Jönköping, Tekniska Högskolan, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-45837.
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BRANZ, LORENZO. "STUDY AND DEVELOPMENT OF ANALYTICAL AND ANALYTICAL-NUMERICAL METHODS FOR THE STUDY OF ELECTRICAL MACHINES." Doctoral thesis, Università degli Studi di Trieste, 2016. http://hdl.handle.net/11368/2908058.
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L’attività di ricerca si è focalizzata sulla determinazione di metodi analitici e analitico-numerici per la soluzione di alcuni problemi “aperti” di interesse nella progettazione e l'analisi di macchine elettriche. La tesi include una gamma piuttosto ampia di argomenti, ma è stata sviluppata seguendo una singola linea di indagine unitaria, che consiste nel tentativo di cercare e, dove possibile, definire e implementare, metodi matematici sufficientemente veloci ma accurati per eseguire calcoli su macchine elettriche in modo da evitare l'uso massiccio di tecniche basate su analisi agli elementi finiti. Queste infatti sono note per essere precise ed affidabili, ma allo stesso tempo richiedono ingenti risorse computazionali e sono quindi poco adatte quando è necessario esplorare un gran numero di varianti di progetto, come nel caso di programmi di ottimizzazione progettuale basati su algoritmi genetici. I metodi agli elementi finiti non sono stati esclusi, naturalmente, ma piuttosto utilizzati come “benchmark” per valutare la validità delle tecniche di calcolo alternative proposte, ove non fosse possibile effettuare un confronto diretto con dati sperimentali. I tipi di macchine elettriche a cui si sono applicati i metodi di calcolo sviluppati in questa tesi sono diversi e vanno dai motori a magneti permanenti superficiali con cave statoriche a motori a magneti permanenti superficiali con statore slotless ,dalle macchine sincrone a riluttanza alle macchine sincrone a rotore avvolto, per finire con motori a induzione a gabbia di scoiattolo. Tutti questi tipi di macchine sono sempre più importanti nelle applicazioni odierne, sia nel settore industriale che per i sistemi di trazione. Per affrontare lo studio di queste macchine si sono di volta in volta sviluppati approcci di calcolo analitico diversi, anche in funzione degli obiettivi da raggiungere. Esempi di questi approcci analitici impiegati sono i seguenti: la teoria della “winding function” applicata al calcolo della coppia di macchine a magneti superficiali; la teoria della “permeance function” applicata al calcolo delle macchine con eccentricità di rotore ; l'approccio mediante circuito equivalente magnetico o reti di riluttanze in combinazione a tecniche basate sulle mappe conformi per lo studio dei motori sincroni a riluttanza; la soluzione delle equazioni di Laplace e di Poisson per determinare il campo magnetico nelle macchine a magneti permanenti superficiali slotless e a gabbia di scoiattolo. Inoltre, l'applicazione degli algoritmi di calcolo proposti è illustrata mediante opportuni casi di studio ed i risultati ottenuti sono sempre convalidati mediante confronto con tecniche di calcolo alternative (in particolare l’analisi agli elementi finiti)
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Zeng, Sai. "Knowledge-based FEA Modeling Method for Highly Coupled Variable Topology Multi-body Problems." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4772.
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The increasingly competitive market is forcing the industry to develop higher-quality products more quickly and less expensively. Engineering analysis, at the same time, plays an important role in helping designers evaluate the performance of the designed product against design requirements. In the context of automated CAD/FEA integration, the domain-dependent engineers different usage views toward product models cause an information gap between CAD and FEA models, which impedes the interoperability among these engineering tools and the automatic transformation from an idealized design model into a solvable FEA model. Especially in highly coupled variable topology multi-body (HCVTMB) problems, this transformation process is usually very labor-intensive and time-consuming.
In this dissertation, a knowledge-based FEA modeling method, which consists of three information models and the transformation processes between these models, is presented. An Analysis Building Block (ABB) model represents the idealized analytical concepts in a FEA modeling process. Solution Method Models (SMMs) represent these analytical concepts in a solution technique-specific format. When FEA is used as the solution technique, an SMM consists of a Ready to Mesh Model (RMM) and a Control Information Model (CIM). An RMM is obtained from an ABB through geometry manipulation so that the quality mesh can be automatically generated using FEA tools. CIMs contain information that controls the FEA modeling and solving activities. A Solution Tool Model (STM) represents an analytical model at the tool-specific level to guide the entire FEA modeling process. Two information transformation processes are presented between these information models. A solution method mapping transforms an ABB into an RMM through a complex cell decomposition process and an attribute association process. A solution tool mapping transforms an SMM into an STM by mimicking an engineers selection of FEA modeling operations.
Four HCVTMB industrial FEA modeling cases are presented for demonstration and validation. These involve thermo-mechanical analysis scenarios: a simple chip package, a Plastic Ball Grid Array (PBGA), and an Enhanced Ball Grid Array (EBGA), as well as a thermal analysis scenario: another PBGA. Compared to traditional methods, results indicate that this method provides better knowledge capture and decreases the modeling time from days/hours to hours/minutes.
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Binde, Peter [Verfasser]. "Wissensbasierte Unterstützung des integrierten CAD-FEA-Prozesses mit einem CBR-Assistenzsystem / Peter Binde." Aachen : Shaker, 2005. http://d-nb.info/1181620031/34.
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Vieira, Maricy Machado Cavalca. "Estudos da obtenção de esteres por lipase de Rhizopus sp LB-FEA-14." [s.n.], 1999. http://repositorio.unicamp.br/jspui/handle/REPOSIP/256689.
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Orientador: Glaucia M. PastoreDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia de Alimentos
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Resumo: Ésteres de ácidos graxos tem larga aplicação como emulsificantes em alimentos, cosméticos e produtos farmacêuticos. Além do seu efeito conservante, os ésteres podem ser utilizados como aromatizantes naturais na indústria alimentícia. Lipases são enzimas pertencentes a classe das Hidrolases que atua em ésteres de ácidos graxos e glicerol na interface óleo-água em um sistema insolúvel ou heterogêneo. Esta característica peculiar se deve ao fato de serem solúveis em água e atuarem em substratos insolúveis em água. O objetivo deste estudo foi verificar as condições ótimas de produção de ésteres em meio reacional aquoso e em solvente orgânico por lipase microbiana. Neste trabalho, foram selecionadas lipases de diferentes microrganismos para produção de ésteres. A lipase de Rhizopus sp FEA-LB-14 foi a enzima mais ativa para a produção de ésteres. As condições ideais para produção de ésteres de sacarose e ácido oléico foram com relação molar de 0,05mol/L:0,05mol/L, respectivamente em tampão acetato O,05M pH 5,6 à 40°C por um período de 96h, usando 4g/L de enzima bruta de Rhizopus sp. A mesma enzima mostrou melhor atividade para a produção de Butil Laurato, em solvente orgânico, frente a outros substratos. As condições ótimas de reação foram: relação molar de butanol e ácido láurico de 1: 1, em hexano, à temperatura de 50°C por 2 horas. A reação de esterificação entre glicerol e diferentes ácidos graxos foi examinada e verificou-se que a enzima esterifica o ácido láurico e glicerol com maior rendimento, produzindo mono, di e triglicerídeos
Abstract: Fatty acid esters are widely applied as emulsifiers in food, cosmetics and pharmaceutical products. Besides their activity in inhibiting microbial growth, these esters can be used as natural flavouring in the food industry. Lipases are enzymes classified as Hidrolases, that act on fatty acid esters and glycerol, at the oil - water in interface, insoluble or heterogeneous systems. This special characteristic is due to its solubility in water and its action on water insoluble substrates. The objective of this work was to verify the optimum conditions for ester production by microbial lipase in an aqueous system and in an organic solvent. In this work, lipases from different microorganisms were selected for ester production. Rhizopus sp. FEA-LB-14 lipase was the most active enzyme found for the production of esters. For oleic acid esters of sucrose, the best conditions for production were obtained with a sucrose: oleic acid molar ratio of: 0.05 Mol/L: 0.05 Mol/L in 0.05 M acetate buffer pH 5.6 at 40°C for 96 hours, using 4g/L Rhizopus sp crude enzyme. Butyllaurate ester was the product with the highest yield, obtained by a lipase catalysed esterification of different fatty acids and alcohol. The optimum reaction conditions were: 1: 1 molar ratio of butanol and lauric acid in hexane at 50° C for 2 hours. The esterification reaction between glycerol and different fatty acid was examined. It was verified that the enzyme gives the greatest yields by esterifying lauric acid and glycerol, producing, monoglyceride, diglyceride and triglyceride
Mestrado
Mestre em Ciência de Alimentos
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Kareaga, Laka Zorion. "Dynamic stiffness and damping prediction on rubber material parts, FEA and experimental correlation." Thesis, London Metropolitan University, 2016. http://repository.londonmet.ac.uk/1125/.
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The final objective of the present work is the accurate prediction of the dynamic stiffness behaviour of complex rubber parts using finite element simulation tools. For this purpose, it becomes necessary to perform a complex rubber compound material characterisation and modelling work; this needs two important previous steps. These steps are detailed in the present document together with a theoretical review of viscoelastic visco-elasto-plastic models for elastomers. Firstly, a new characterisation method is proposed to determine the degree of cure of rubber parts. It is known that the degree of cure of rubbers bears heavily on their mechanical properties. This method consists of the correlation of swelling results to rheometer data achieving a good agreement. Secondly, the influence of the strain rate used in static characterisation tests is studied. In this step, a new characterisation method is proposed. The latter characterisation method will be used to fit extended hyperelastic models in Finite Element Analysis (FEA) software like ANSYS. The proposed method improves the correlation of experimental data to simulation results obtained by the use of standard methods. Finally, the overlay method proposed by Austrell concerning frequency dependence of the dynamic modulus and loss angle that is known to increase more with frequency for small amplitudes than for large amplitudes is developed. The original version of the overlay method yields no difference in frequency dependence with respect to different load amplitudes. However, if the element in the viscoelastic layer of the finite element model are given different stiffness and loss properties depending on the loading amplitude level, frequency dependence is shown to be more accurate compared to experiments. The commercial finite element program Ansys is used to model an industrial metal rubber part using two layers of elements. One layer is a hyper viscoelastic layer and the other layer uses an elasto-plastic model with a multi-linear kinematic hardening rule. The model, being intended for stationary cyclic loading, shows good agreement with measurements on the harmonically loaded industrial rubber part.
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Deere, Matthew. "Guided wave evaluation of pipes using the first and second order torsional wave mode." Thesis, Brunel University, 2017. http://bura.brunel.ac.uk/handle/2438/15307.
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Guided wave inspection is a form of ultrasonic testing used for non-destructive testing (NDT). Guided waves are capable of propagating long distances bounded by the geometries of the specimen, such as pipes and plates. The technique is commercially used to detect defects in pipelines and is capable of a full volumetric screening many metres (often up to around 100m) from one location. Fundamental axisymmetric wave modes are used to inspect pipelines and are used to quantify defects and features. However, as the technology has progressed, a demand for improving defect sensitivity, spatial resolution and developing the technology into new fields has been recognised. Operating at medium range frequencies is one possibility that could provide the increase in defect sensitivity and spatial resolution required that may not be achieved at low range frequencies. The use of higher order wave modes could also provide additional information useful for defect sizing. Guided wave inspection is a complex ultrasonic technique due to the many wave modes that exist and testing at medium range frequencies requires some challenges to be overcome. The research presented here investigates the potential of using the second order torsional wave mode at medium range frequencies and provides a new sizing technique that for some applications is likely to offer advancement in guided wave inspection and monitoring. The approach firstly included the design and implementation of a setup for analysing the complex signal responses in order to access the higher order torsional wave mode T(0,2) for defect sizing. An efficient method of using FEA has been presented using segmented models to provide the capability of analysing defects with small increment changes that could not be achieved using a full 3D model of the pipe. Using a pipe segment to virtually represent the full pipe also allowed small changes in defect size to be investigated, which would otherwise be extremely difficult to accurately machine experimentally. The FEA modelling technique is also based on broadband signals in comparison to the conventional approach of using narrowband signals and is capable of obtaining a wide frequency spectrum from one model, which significantly reduces the number of models needed to conduct a frequency analysis. Following on from this work, a high density transducer array was developed and compared against a conventional transducer array used in guided wave inspection for the purpose of medium range frequency inspection, which can also be applied to conventional low range frequency inspection. Finally, a new defect sizing method using T(0,2) is presented, which is capable of predicting the depth using peak amplitude responses from spectral analysis and by comparing this to the cut-off frequency of the remaining wall thickness of the defect. The technique has the potential to improve defect sizing, defect sensitivity, increase spatial resolution, and increase the performance of medium range inspection.
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Hu, Yajie. "Thermal Barrier Coating Modeling for Stress Analysis." Thesis, Université d'Ottawa / University of Ottawa, 2021. http://hdl.handle.net/10393/42668.
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Thermal barrier coatings (TBCs) have been used widely in aerospace and land-based gas turbines. The TBC system consists of a top coat layer, a thermally grown oxide (TGO), a bond coat layer and a substrate. The growth kinetics of the TGO significantly affects the durability of TBCs. At a critical TGO thickness, the growth stresses exceed the ceramic-bond coat interface strength, resulting in TBC system failure. Regardless of the deposition method used, it is vitally important to accurately predict the TBC lifetime by investigating the determinants of the failure. The main objective of this study was to investigate the effect of oxidation stress induced by TGO layer in high temperature cycling environment through a series of reliable numerical simulations. Indeed, this oxidation stress is a known factor of interface degradation, and may result in failure of the ceramic-metal interface.
A 2-D finite element model of the TBC was built via ANSYS APDL software, to conduct parametric studies of increasing complexity. The model accounted for elasticity first, before creep was integrated. Then, the model included swelling induced by phase transformation associated with oxidation, incorporating the effect of volumetric expansion of the newly grown TGO. This coupled oxidation constitutive approach was implemented for a typical air plasma spray deposited TBC coating. The interfacial radial stresses induced by the gradual oxidation were investigated. Different morphologies of the TBC interface were also considered to analyze the roughness effect on interface stresses. A complete model including swelling, creep, aging effects on the TBC layers at a given roughness was finally investigated.
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Matzinger, Thomas. "An Overview of Body Armor and Single Plate Impact Dynamics." DigitalCommons@CalPoly, 2018. https://digitalcommons.calpoly.edu/theses/1808.
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In the past, personal body armor was constructed of simple plates of high- strength alloys. However, with the advancement of modern combat and weaponry, particularly armor-piercing ammunition, personal body armor has evolved into more complex and effective metal, ceramic, and composite structures. This paper lays the groundwork for experimental and modeling methods used to understand the effectiveness of new armor designs. Focusing on the first layer of modern body armor, the ”High Impedance” layer. Experiments measuring the change in velocity of bullets passing through aluminum and titanium plates were conducted. These experiments were then replicated through FEA simulation.
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Mahadevan, Sankar. "Developing a Vehicle Hydroplaning Simulation using Abaqus and CarSim." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/79699.
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Tires are the most influential component of the vehicle as they constitute the only contact between the vehicle and the road and have to generate and transmit forces necessary for the driver to control the vehicle. Hydroplaning is a phenomenon which occurs when a layer of water builds up between the tires of a vehicle and the road surface which leads to loss of traction that prevents the vehicle from responding to control inputs such as steering, braking or acceleration.
It has become an extremely important factor in the automotive and tire industry to study the factors affecting vehicle hydroplaning. Nearly 10-20% of road fatalities are caused by lack of traction on wet surfaces. The tire tread pattern, load, inflation pressure, slip and camber angles influence hydroplaning to a great extent. Finite Element Analysis, although computationally expensive, provides an excellent way to study such Fluid Structure Interactions (FSI) between the tire-water-road surfaces. Abaqus FSI CEL approach has been used to study tire traction with various vehicle configurations.
The tire force data obtained from the Finite Element simulations is used to develop a full vehicle hydroplaning model by integrating the relevant outputs with the commercially available vehicle dynamics simulation software, CarSim.Master of Science
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Ishii, Kohki. "Design and Stress Analysis of Dynamic Spinal Stabilizers." OpenSIUC, 2010. https://opensiuc.lib.siu.edu/theses/270.
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A dynamic lumbar spinal stabilizer with a helical machined spring element was created in the first stage. The stabilizer was built with 30 N/mm of axial stiffness because if the human body is moved to flexion and extension, this amount of a compressive and tensile load would be applied to the intervertebral disc. The stabilizer supports the loads instead of the disc. The stiffness was influenced by the number of coils, the thickness of coils, and length of the coil element. The stiffness can be determined by analytical equations or by finite element analysis (FE), such as ANSYS Workbench. In the second stage, the lumbar spine FE model was successfully constructed by using Autodesk Inventor 2010. There were three different analyzed models; (1) intact model, (2) fused model, and (3) dynamically stabilized model. This intact model is a simplified and basic model used for fused model and dynamically stabilized model. The range of motion (ROM) was the key term in this study. In other words, examination of each model was based on how much ROM was shown when the flexion, extension, and bending moments have been applied on the spine. The ROM of each model with three moments produced appropriate values compared to the references. The stress analysis is also important to optimize the design of the dynamic stabilizer. The maximum stress was 472 MPa on the stabilizer that is less than yield strength of Titanium alloy.
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Abu, Sharkh Abdal Aziz. "Improving the Numerical Efficiency of a High Accuracy Shell Element for Soft Tissues." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39626.
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For the finite element (FE) simulation of relatively thin organs under complex dynamic loadings that are relevant in the biomedical engineering field, shell elements, compared to volume elements, have the potential to capture the whole thickness of the organ at once. Shell elements, are also known to feature efficiently large critical time steps, ensuring competitive computational times in dynamic structural analysis projects. As an improvement to the tools available for modelling and analysis, a new general nonlinear thick continuum-based (CB) shell FE embedded in an updated Lagrangian formulation and an explicit time integration scheme was recently developed. It can account for irregular and complex geometries, and hyper-elastic, large, nearly incompressible anisotropic 3D deformations characteristic of soft tissues. The original proof of concept was developed in MATLAB, which despite known advantages, is very slow. As a result, computational times, even for simple problems, have not been competitive. Therefore, the present work focused on re-writing the code in an efficient programming language with execution speed in mind in order to compete with the available elements which, in spite of having inferior capabilities, have better running times. In addition, a programming algorithm was needed to improve running time. Once it was implemented, the running time was reduced in half on a benchmark problem. Optimization was then exploited to introduce workarounds and design improvements that reduced running time further to 95% of its original value. The new version of the code was implemented in C++ and reached the goal of reducing running time while maintaining the expected functionality.
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Persson, Petter. "Finite element analysis of hot rolling in the blooming mill." Thesis, Högskolan Dalarna, Materialteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:du-22676.
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During this thesis work a coupled thermo-mechanical finite element model (FEM) was builtto simulate hot rolling in the blooming mill at Sandvik Materials Technology (SMT) inSandviken. The blooming mill is the first in a long line of processes that continuously or ingotcast ingots are subjected to before becoming finished products. The aim of this thesis work was twofold. The first was to create a parameterized finiteelement (FE) model of the blooming mill. The commercial FE software package MSCMarc/Mentat was used to create this model and the programing language Python was used toparameterize it. Second, two different pass schedules (A and B) were studied and comparedusing the model. The two pass series were evaluated with focus on their ability to healcentreline porosity, i.e. to close voids in the centre of the ingot. This evaluation was made by studying the hydrostatic stress (σm), the von Mises stress (σeq)and the plastic strain (εp) in the centre of the ingot. From these parameters the stress triaxiality(Tx) and the hydrostatic integration parameter (Gm) were calculated for each pass in bothseries using two different transportation times (30 and 150 s) from the furnace. The relationbetween Gm and an analytical parameter (Δ) was also studied. This parameter is the ratiobetween the mean height of the ingot and the contact length between the rolls and the ingot,which is useful as a rule of thumb to determine the homogeneity or penetration of strain for aspecific pass. The pass series designed with fewer passes (B), many with greater reduction, was shown toachieve better void closure theoretically. It was also shown that a temperature gradient, whichis the result of a longer holding time between the furnace and the blooming mill leads toimproved void closure.
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Cerchiari, Candice Quinelato Baptista. "Fea, velha, sandia: imagens da mulher nas cantingas de escárnio e maldizer galego-portuguesas." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/8/8138/tde-19112009-145140/.
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O objetivo desta pesquisa é buscar as imagens da mulher nas cantigas de escárnio e maldizer galego-portuguesas. Para caracterizar o ambiente de produção dessa poesia, usaremos como contraponto às fontes literárias uma documentação de caráter mais objetivo e descritivo: compilações legais peninsulares, As Sete Partidas, de Leão e Castela, e o Livro das Leis e Posturas e as Ordenações Afonsinas, de Portugal, numa tentativa de compreender os problemas concretos relativos ao papel social da mulher no âmbito do casamento e da herança que ensejaram a composição das cantigas satíricas. Por meio dos comentários feitos pelos trovadores, dirigidos a mulheres ou a homens a elas relacionados, buscaremos compreender os juízos de valor que norteiam sua visão dos vícios e das virtudes da figura feminina e, assim, identificar facetas da mulher que, vistas à luz do momento histórico-literário que procuramos caracterizar, perfarão nosso objetivo de descrever a figura da mulher que nos foi legada por meio das cantigas satíricas ibéricas medievais.The goal of this research is to find womens images in the Galician-Portuguese cantigas de escárnio e maldizer. In order to characterize the ambience of production of this kind of poetry, it will be used as counterpoint to the literary fonts a more objective and descriptive documentation: the peninsular legal compilations, As Sete Partidas, from Leon and Castille, and the Livro das Leis e Posturas and the Ordenações Afonsinas, from Portugal, as an attempt to understand concrete problems related to womens social part as it is pertinent to marriage and inheritance, which instigated the writing of the satirical ballads. By means of the comments made by the troubadours, about women or men related to them, we shall seek comprehension of the value-judgments which guide their vision of the vices and virtues of the feminine figure and, thus, identify the woman facets that, seen in light of the historical-literary moment characterized, will make our objective to describe the womens images bequeath to us by the Iberian medieval satiric ballads.