Dissertations / Theses on the topic 'CRASP'
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Zuber-Skerritt, Ortrun Dorothea, and mikewood@deakin edu au. "Action research in higher education: The advancement of university learning and teaching." Deakin University. School of Education, 1987. http://tux.lib.deakin.edu.au./adt-VDU/public/adt-VDU20050902.102949.
Full textMartin, Michael T. "Christian Crash Course." Digital Commons at Loyola Marymount University and Loyola Law School, 2010. https://digitalcommons.lmu.edu/etd/116.
Full textJaneček, Milan. "Crash Analysis Portal." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2008. http://www.nusl.cz/ntk/nusl-235982.
Full textArgenta, Marshall. "Crash Tested: Galactic Modern." Kent State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=kent1524434869769979.
Full textUribe, Vidal José Patricio. "Opacidad, retorno y crash." Tesis, Universidad de Chile, 2015. http://repositorio.uchile.cl/handle/2250/134564.
Full textSin lugar a dudas, la creciente preocupación por la eficiencia de los mercados1, tanto en el ámbito académico como entre profesionales y autoridades reguladoras, viene motivada por los múltiples escándalos financieros en las últimas décadas2 y se ha enfocado en cómo fortalecer este aspecto vía el mejoramiento de la transparencia de la información divulgada por las empresas. Particularmente, las autoridades reguladoras han tomado conciencia acerca del rol que cumple la información financiera y han promulgado una serie de reformas a los sistemas financieros, incluyendo aquellas relacionadas con el gobierno corporativo, las normativas contables y el papel que cumple la función de auditoría (Klapper y Love, 2004; Kothari et al., 2010; Baxter y Cotter, 2009). Casos como el de Worldcom (2002) y Enron (2001) en el contexto norteamericano y La Polar (2011) para el caso chileno han generado grandes pérdidas para accionistas y acreedores. Cabe señalar, que ex –ante al caso La Polar, Chile no había presentado mayores problemas relacionados con un engaño sistemático al mercado a través de información contable. Otros escándalos, como el de Enron, han traído consigo la promulgación de leyes como la Sarbanes-Oxley3, la cual introdujo muchos cambios a la regulación y prácticas financieras, así como al gobierno corporativo, lo que ha ayudado a disminuir el manejo arbitrario de los estados financieros respecto a los ingresos de las firmas (Cohen, Dey & Lys 2008). No cabe duda que la transparencia de los estados financieros es crucial, especialmente dado que en los últimos años el mercado Chileno ha crecido de forma sostenible. Según el Reporte de competitividad global del Foro Económico Mundial 2013-2014, Chile está en el lugar 20 de 148 países respecto al Desarrollo del Mercado Financiero y tiene el puesto 8 respecto al tamaño total de las firmas nacionales en bolsa (capitalización bursátil) como porcentaje del PIB (117,67%) para el año 2012 de la región, en ambos casos por sobre muchas economías desarrolladas, y con PIB parecido por lo que es un tema relevante para estudiar en Chile, tomando en cuenta que la literatura es relativamente nueva (1990 en adelante) y que en la región y el país existen muy pocas investigaciones al respecto.
Alfallaj, Ibrahim Saleh. "Analysis of Crash Location and Crash Severity Related to Work Zones in Ohio." University of Dayton / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1406912337.
Full textDoohan, Isabelle. "Surviving a major bus crash : experiences from the crash and five years after." Doctoral thesis, Umeå universitet, Kirurgi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-140198.
Full textBakgrund Stora trafikskadehändelser kan ha en betydande inverkan på de överlevande och deras närståendes liv, likaså på sjukvårdspersonal, vittnen, och andra som är involverade. Trots detta så är de överlevandes perspektiv sällsynta eller saknas i forskning om stora trafikskadehändelser i Sverige. Det saknas även en helhetsförståelse av överlevande och deras erfarenheter. Genom att studera hur det är att överleva en busskrasch kan omhändertagande och stöd anpassas och förbättras. Det övergripande syftet är att öka förståelsen av kort- och långsiktiga konsekvenser och erfarenheter av att överleva en stor busskrasch. Metod Kontexten är två busskrascher som inträffade i februari 2007 och december 2014 i Sverige. Antal deltagare är 110 av 112 överlevande och data samlades in en månad, tre månader och fem år efter krascherna, via telefonintervjuer, officiella rapporter och medicinska journaler. Analysmetoder inkluderar kvalitativ innehållsanalys, deskriptiv statistik, tematisk analys och mixad metod. Resultat En månad efter kraschen upplevde överlevande fysiskt obehag och/eller psykisk stress i varierande grad i sin vardag (Studie I). Gällande upplevelser av det initiala omhändertagandet (Studie II) identifierades fyra huvudresultat; obehag på skadeplats, brister i omhändertagande och bemötande, missnöje med krisstöd, och tillfredsställande initialt omhändertagande och stöd. Betydelsen av empati och medkänsla från personal och frivilliga samt samhörighet med medpassagerare lyftes fram av de överlevande. Fem år efter busskraschen i Rasbo (Studie III) fanns det överlevande som fortfarande kämpade med fysiska skador och psykiska problem. Andra tydliga långsiktiga konsekvenser var en bestående gemenskap mellan medpassagerare, en tacksamhet över livet, samt oro och rädsla i trafiken, speciellt vid bussåkande. Uppföljningen efter busskraschen i Tranemo (Studie IV) indikerade att sociala aspekter var betydelsefulla för återhämtningsprocessen hos överlevande och att skadornas svårighetsgrad inte var betydande för det psykiska välbefinnandet. En stark samhörighet upplevdes bland de närstående som reste tillsammans och de verkade följa varandras återhämtning. Slutsatser Ett starkt behov av kort- och långsiktigt socialt och psykologiskt stöd i form av gemenskap och empati är tydligt i samtliga studier. De överlevande bör uppmärksammas som aktörer med kapacitet och resurser till att bidra till sin egen och medpassagerares återhämtning och hälsa. Det behövs en ökad förståelse för hur olika de överlevande är, med varierande fysiska, psykologiska, sociala, och existentiella behov.
Burvall, Caroline, Mireille Elin Fumba, and Nina Koukara. "Crash Boom Bang : Tvärkulturell kommunikation." Thesis, University of Kalmar, Baltic Business School, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hik:diva-1898.
Full textCan the lack of functional cross-cultural communication among individuals within an international organization be the reason for cultural clashes to occur, and lead to conflict between two cultures within the same organization?
Our aim is to try to create a potential model of how cross-cultural problems can be studied, in order to contribute to the solution of the problem. And to examine whether the theories, which form the basis of our model can be applied in reality.
The research have assumed from the hermeneutical approach for a holistic view of the problem area. The deductive approach has been used in order to distinguish whether the theories can be applied to reality, and qualitative research method for collecting data.
The focus lies within cross-cultural communications, which defines the various cultural factors that can affect organizational culture. Hofstede dimensions and the social structure are mentioned and cultural factors as language and religion. The piece includes the national and organizational culture theory and the establishment strategies. Subsequently the culture clashes, the international business relations and conflict resolution.
Our conclusion is that culture clashes occur and the further away from our own values, attitudes and norms, we get, the more tolerant we relate to other cultures. We note that organizational culture is influenced by individuals which constitutes in it and the theory and reality may not always correspond. That culture is a complexity to study, where tolerance, acceptance and understanding are the most important tools for cross-cultural communication.
Svensson, Irene, and Tony Wingård. "Crash Memory : SAAB Automobile AB." Thesis, University West, Department of Technology, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-402.
Full textLieb, Claudia. "Crash der Unfall der Moderne." Bielefeld Aisthesis-Verl, 2006. http://d-nb.info/991115597/04.
Full textTurkoglu, Ata. "Natural time and crash risk." Thesis, University of Essex, 2015. http://repository.essex.ac.uk/16099/.
Full textDias, Ishani Madurangi. "Work zone crash analysis and modeling to identify factors associated with crash severity and frequency." Diss., Kansas State University, 2015. http://hdl.handle.net/2097/20517.
Full textCivil Engineering
Sunanda Dissanayake
Safe and efficient flow of traffic through work zones must be established by improving work zone conditions. Therefore, identifying the factors associated with the severity and the frequency of work zone crashes is important. According to current statistics from the Federal Highway Administration, 2,372 fatalities were associated with motor vehicle traffic crashes in work zones in the United States during the four years from 2010 to 2013. From 2002 to 2014, an average of 1,612 work zone crashes occurred in Kansas each year, making it a serious concern in Kansas. Objectives of this study were to analyze work zone crash characteristics, identify the factors associated with crash severity and frequency, and to identify recommendations to improve work zone safety. Work zone crashes in Kansas from 2010 to 2013 were used to develop crash severity models. Ordered probit regression was used to model the crash severities for daytime, nighttime, multi-vehicle and single-vehicle work zone crashes and for work zones crashes in general. Based on severity models, drivers from 26 to 65 years of age were associated with high crash severities during daytime work zone crashes and driver age was not found significant in nighttime work zone crashes. Use of safety equipment was related to reduced crash severities regardless of the time of the crash. Negative binomial regression was used to model the work zone crash frequency using work zones functioned in Kansas in 2013 and 2014. According to results, increased average daily traffic (AADT) was related to higher number of work zone crashes and work zones in operation at nighttime were related to reduced number of work zone crashes. Findings of this study were used to provide general countermeasure ideas for improving safety of work zones.
Kusano, Kristofer Darwin. "Methodology for Determining Crash and Injury Reduction from Emerging Crash Prevention Systems in the U.S." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/23672.
Full textThe methodology developed for this research includes the following components: 1) identification of the target population, 2) development and validation of a driver model, 3) development of injury risk functions, 4) development of a crash severity reduction model, and 5) computation of fleet-wide benefits. This dissertation presents a general methodology for each of these components that could be used for any active safety system. Then a specific model is constructed for FCAS.
FCAS could potentially be applicable to 31% of all collisions, 6% of serious injury crashes, and 7% of fatal crashes. Annually, this accounts for 3.3 million collisions and 18,367 fatal crashes. We developed a model of driver braking in response to a forward collision warning. Next we used logistic regression to develop injury risk functions that predicted the probability of injury given the crash severity ("V) and occupant characteristics. Finally, we simulated 2,459 real-world rear-end collisions as if the driver had an FCAS with combinations of warnings, brake assist, and autonomous braking. We found that between 3.4% and 7.2% of crashes could be prevented and that many more could be mitigated in severity. These systems reduced the number of injured (MAIS2+) drivers in rear-end collisions between 32% and 55%. In total, the systems could prevent between $184 and $338 million in economic costs associated with crashes per year.
Ph. D.
Daouacher, Maria. "Evaluation of occupant kinematics in crash using the PIPER model : in frontal and oblique crash simulations." Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-74250.
Full textBlåberg, Christian. "Chest Observer for Crash Safety Enhancement." Thesis, Linköping University, Department of Electrical Engineering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-12229.
Full textFeedback control of Chest Acceleration or Chest Deflection is believed to be a good way of minimizing the risk of injury. In order to implement such a controller in a car, an observer estimating these responses is needed. The objective of the study was to develop a model of the dummy’s chest capable of estimating the Chest Acceleration and the Chest Deflection during frontal crashes in real time. The used sensor data come from car accelerometer and spindle rotation sensor of the belt, the data has been collected from dummies during crash tests. This study has accomplished the aims using a simple linear model of the chest using masses, springs and dampers. The parameters of the model have been estimated through system identification. Two types of black-box models have also been studied, one ARX model and one state-space model. The models have been tested and validated against data coming from different crash setups. The results show that all of the studied models can be used to estimate the dummy responses, the physical grey-box model and the black-box state-space model in particular.
Genom att använda återkoppling av storheterna bröstacceleration och bröstintryck antas man kunna minska risken för skador vid krockar i personbilar. För att kunna implementera detta behövs en observatör för dessa storheter. Målet med denna studie är att ta fram en modell för att kunna skatta accelerationen i bröstkorgen samt bröstintrycket i realtid i frontala krockar. Sensordata som använts kom från en accelerometer och en givare för att mäta rotationen i bältessnurran. Detta har gjorts genom att modellera bröstkorgen med linjära fjädrar och dämpare. Dess parametrar har skattats från data från krocktester från krockdockor. Två s.k. black-box-modeller har också tagits fram, en ARX-modell och en på tillståndsform. Modellerna har testats och validerats mha data från olika sorters krocktester. Resultaten visar att alla studerade modeller kan användas för att skatta de ovan nämnda storheterna, den fysikaliska modellen och black-box-modellen på tillståndsform fungerade bäst.
Hua, Tan Cuong. "Uncertain crash model, theory and applications." Thesis, Imperial College London, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.440514.
Full textHopkins, Roisin. "System identification for crash victim simulation." Thesis, Loughborough University, 1995. https://dspace.lboro.ac.uk/2134/7053.
Full textChen, Haogang. "Certifying a crash-safe file system." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/107325.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (pages 93-99).
File systems are a cornerstone for storing and retrieving permanent data, yet they are complex enough to have bugs that might cause data loss, especially in the face of system crashes. FSCQ is the first file system that (1) provides a precise specification for the core subset of POSIX file-system APIs; and the APIs include fsync and fdatasync, which allow applications to achieve high I/O performance and crash safety, and that (2) provides a machine-checked proof that its I/O-efficient implementation meets this precise specification. FSCQ's proofs avoid crash-safety bugs that have plagued file systems, such as forgetting to insert a disk-write barrier between writing the data from the log and writing the log's commit block. FSCQ's specification also allows applications to prove their own crash safety, avoiding application-level bugs such as forgetting to invoke fsync on both the file and the containing directory. As a result, applications on FSCQ can provide strong guarantees: they will not lose data under any sequence of crashes. To state FSCQ's theorems, FSCQ introduces the Crash Hoare Logic (CHL), which extends traditional Hoare logic with a crash condition, a recovery procedure, and logical address spaces for specifying disk states at different abstraction levels. CHL also reduces the proof effort for developers through proof automation. Using CHL, the thesis developed, specified, and proved the correctness of the FSCQ file system. FSCQ introduces a metadata-prefix specification that captures the properties of fsync and fdatasync, based on Linux ext4's behavior. FSCQ also introduces disk sequences and disk relations to help formalize the metadata-prefix specification. The evaluation shows that FSCQ enables end-to-end verification of application crash safety, and that FSCQ's optimizations achieve I/O performance on par with that of Linux ext4.
by Haogang Chen.
Ph. D.
Lavaud, Gael. "Optimisation robuste appliquée au crash automobile." Ecully, Ecole centrale de Lyon, 2007. http://bibli.ec-lyon.fr/exl-doc/TH_T2092_glavaud.pdf.
Full textThis PhD thesis deals with robust design of complex systems with numerical simulations. The analysis of RENAULT design strategy suggests us concrete improvements based on the FIRST DESIGN methodology. This strategy relies on Engineering System ant the concept of robustness applied to all design step of the product. It uses all new design tools, as well statistical as modeling. This strategy allows designers to avoid design resource consuming and time demanding iterations. We use two concrete case study to illustrate our work. These cases take place in the context of costly simulations, that is why we will have to save them. First case study is about shape optimization of a pedestrian hood panel. We develop an industrial optimization tool and use it to find a satisfying shape. To save simulations, we also develop a special parameterization and a progressive validation of new shapes. Second case study is about robust design of a frontal crash. As traditional approaches could not fit our problem, we develop an original strategy based on crash scenarios. This method allows designers to identify unstable structural elements and to stabilize their behavior during the crash in the best conditions. All the tools developed along this work tend to take the best advantage of both new simulations tools and designers experience. Improvements of performance and design time on both cases study prove the interest of modifying the traditional design strategy to incorporate new numerical design tools
KASHAYI, NAGARAJU C. "MODELING BASE CRASH RATES FOR INTERSECTIONS." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1163775240.
Full textMeadows, M. L. "Psychological correlates of road crash types." Thesis, University of Manchester, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.517146.
Full textWilliams, Brian. "Bicycle Crash Detection: Using a Voice-Assistant for More Accurate Reporting." Thesis, University of Oregon, 2018. http://hdl.handle.net/1794/23760.
Full textGraziani, Luca. "Cosmological radiative transfer through metals in CRASH." Diss., lmu, 2012. http://nbn-resolving.de/urn:nbn:de:bvb:19-149355.
Full textChiang, K. (Kuoning). "Parallel processing approach for crash dynamic analysis." Diss., Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/17917.
Full textAl-Senan, Shukri Hasan. "A study of head-on crash sites." Diss., Georgia Institute of Technology, 1985. http://hdl.handle.net/1853/21466.
Full textKoether, Paul. "GARCH-like models with dynamic crash-probabilities." [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=976610248.
Full textMandavilli, Srinivas. "Data mining the Kansas traffic-crash database /." Search for this dissertation online, 2006. http://wwwlib.umi.com/cr/ksu/main.
Full textKumblekere, Jaikanth B. "A parametric evaluation of vehicle crash performance." Ohio : Ohio University, 1996. http://www.ohiolink.edu/etd/view.cgi?ohiou1178299084.
Full textCauchi, Savona Silvano. "Energy absorbing composites for crash energy management." Thesis, Queen Mary, University of London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.409297.
Full textPike, Scott Mason. "Distributed resource allocation with scalable crash containment." Connect to this title online, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1092857584.
Full textTitle from first page of PDF file. Document formatted into pages; contains xiv, 154 p.; also includes graphics, map. Includes bibliographical references (p. 148-154). Available online via OhioLINK's ETD Center
Bruch, Olaf. "Materialbeschreibungen für die Crash-Berechnung von Kunststoffbauteilen." Aachen Shaker, 2009. http://d-nb.info/994690061/04.
Full textMuthyala, Monica. "Design and Crash Analysis of Ladder Chassis." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-18475.
Full textLi, Yating. "Currency crash risk in the carry trade." Thesis, University of Glasgow, 2017. http://theses.gla.ac.uk/8393/.
Full textBiakeu, Guy. "Modélisation multicorps : application au crash des structures." Ecully, Ecole centrale de Lyon, 2000. http://www.theses.fr/2000ECDL0023.
Full textIndustrial norms in terms of security and comfort of the passengers cars, aiplanes or boats are becoming more and more draconian. The constructors are now obliged to succeed severe tests like the resistance of their products to crashes or their stability. Moreover, these aspects happenned to be excelent arguments for the marketing departements as consumers prefer solid cars or trains to beautifull ones. On another hand, economic reasons bring industrials to reduce the number of real tests on the full structure and to increase the use of numerical simulation during the conception of vehicules. In this thesis we develop a technique based on multibody modelling of beams. It takes large displacements and large rotations in charge. We called it the Large Curvature Description (LCD). In the plane, the shape of the beam are interpolated with arcs of circle. In the space, we use Euler angles to describe the orientation of the sections and we introduce elementary angles to keep the same linear evolution of the orientation as in the plane. Only bending and torsion deformations are studied but we can extend the formulation to traction and shear. Plastic regions are modelled as nonlinear hinges. The behaviour of these hinges is represented by a mathematical expression in which the collapse appears as a negative exponential The hinges are located with an interpolation of the bending moments and the torsion moment built as a norm on the structure. Constraints systems are solved with the Lagrange multipliers technique and we use an explicit scheme to solve the equations of motion. We compare our results to those of simulation under explicits codes as ABAQUS/Explicit or to techniques developped by authors in the literature
Roussel, Stephane M. "Sensor Integration for Low-Cost Crash Avoidance." DigitalCommons@CalPoly, 2009. https://digitalcommons.calpoly.edu/theses/184.
Full textVrachnou, Amalia. "An Analysis of Emergency Vehicle Crash Characteristics." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/34612.
Full textMaster of Science
Kanke, Jennifer S. "Crash Course in the Philosophy of Passion." Ohio University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1242835565.
Full textJacot-Guillarmod, Paul. "Sobriety of crisp and fuzzy topological spaces." Thesis, Rhodes University, 2004. http://hdl.handle.net/10962/d1005228.
Full textAbdullah, Ahmad Sufian. "Crash simulation of fibre metal laminate fuselage." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/crash-simulation-of-fibre-metal-laminate-fuselage(fd254489-243f-4071-8dea-ca9e2dd9d3bc).html.
Full textSharma, Sanjeev. "Sandwich steels for crash energy absorption applications." Thesis, University of Warwick, 2014. http://wrap.warwick.ac.uk/74157/.
Full textKřižák, Michal. "Využití počítačové podpory při řešení předstřetového pohybu vozidel." Master's thesis, Vysoké učení technické v Brně. Ústav soudního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-232640.
Full textDurrenberger, Laurent Molinari Alain. "Analyse de la pré-déformation plastique sur la tenue au crash d'une structure crash-box par approches expérimentale numérique." [S.l.] : [s.n.], 2007. ftp://ftp.scd.univ-metz.fr/pub/Theses/2007/Durrenberger.Laurent.SMZ0741.pdf.
Full textFrisch, Norbert. "Verfahren zur Unterstützung der Arbeitsabläufe bei der Crash-Simulation im Fahrzeugbau." [S.l. : s.n.], 2004. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB11051841.
Full textMannila, Kranthi Kiran. "ANALYSIS OF VARIOUS CAR-TRUCK CRASH TYPES BASED ON GES AND FARS CRASH DATABASES USING MUTLINOMIAL AND BINARY LOGIT MODEL." Master's thesis, University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2583.
Full textM.S.
Department of Civil and Environmental Engineering
Engineering and Computer Science
Civil Engineering
Durrenberger, Laurent. "Analyse de la pré-déformation plastique sur la tenue au crash d'une structure crash-box par approches expérimentale et numérique." Thesis, Metz, 2007. http://www.theses.fr/2007METZ041S/document.
Full textTo preserve the integrity of vehicle passengers during a crash constitutes a major goal for the automotive manufacturers since many years. The aim of this Ph-D thesis is to analyze the effect of a plastic prestrain on crash properties of a crash-box structure. The loading history is composed of at least two phases. The first phase is the forming process, in general under quasi-static conditions. The subsequent loading is due to a crash event. The behavior of three steels frequently used in the automotive industry has been studied (BH260, DP600, TRIP800). The experimental characterization of the steels shows the effect of a quasi-static prestrain on subsequent dynamic tensile curves. In addition, a large experimental crushing campaign of structures revealed that the prestrain process improves the crash behavior despite a reduction of the wall thickness. Two phenomenological models are then proposed to describe the strain-hardening effects and strain-rate sensitivity of metals. The model predictions show a very good agreement with experimental results for a wide range of strain-rate. Strain-rate history effects are well accounted for by one of the models. Finally, a numerical approach is performed where the variables calculated during the stamping (residual stress, equivalent plastic deformation, final thickness) are taken into account during the crash simulation under dynamic loading
Vuong, Thi Thanh Thuy. "Réduction de modèle de crash automobile : application en optimisation." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEC025.
Full textThe numerical simulation is more and more applied in the industry in order to reduce the physical tests costs. A crash simulation (pre-processing, processing and post-processing) takes about one or two days. Renault uses the optimization, so numerous crash simulations, to size cars. To cut back the total cost of a whole crash simulations, the aim of this thesis is to propose a or some Reduced-Order Model (ROM) methods that can be applied in a parametric space. The suggested methods in this thesis are nonintrusive and neither the solver nor the model should not be modified . The first tested method is the Proper Orthogonal Decomposition. This method allows reducing the behavior of a crash simulation and understanding the crash properties but not interpolating in a parametric space. The second method, ReCUR, is a variant of the classical decomposition CUR. It will be demonstrated as a general form of the non-intrusive methods. It allows overcoming two important limits of actual ROM methods : size of the model and the interpolation
Schönebeck, Kai. "Ein Inertialmesssystem zur Bewegungserfassung von Dummypuppen in Kfz-Crashtests." Aachen Shaker, 2009. http://d-nb.info/994908539/04.
Full textKieliszewski, Cheryl A. "Twisted Metal: An Investigation into Observable Factors that Lead to Critical Traffic Events." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/29859.
Full textPh. D.
Tatem, Whitney M. "The Crash Injury Risk to Rear Seated Passenger Vehicle Occupants." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/96550.
Full textDoctor of Philosophy
Historically, if a passenger vehicle such as a sedan or SUV is in a crash, occupants who are rear-seated were less likely to be hurt than someone who was front-seated. In other words, rear-seated occupants have been at a lower risk of injury than front-seated occupants. Indeed, safety for front seat occupants has improved drastically in the 21st century due to advancements in airbag and seatbelt technologies, among others, but has it improved so much that the front seat is now safer than the rear? Today, of all vehicle occupants who are killed in crashes on U.S. roadways, 10% are rear-seated. During this time when conversations surrounding vehicle safety are focused on achieving zero traffic deaths, the safety of rear-seated occupants must be further studied. This dissertation looked at national databases of all police-reported crashes that occur each year in the United States. The risk of injury to rear-seated passenger vehicle occupants was quantified and compared to that of front-seated occupants. Factors that may increase or decrease this risk of injury and fatality such as crash type, vehicle type, and occupant demographics were further explored and reported. In vehicles that were rear-ended, the risk of injury was greater for rear-seated occupants than their front-seated counterparts. When a vehicle crashes into something front-first (the most common type of impact in a vehicle crash), evidence is presented that the risk of fatality is greater in the rear seats than the front seats in model year 2007 and newer vehicles which generally are equipped with the most recent airbag and seatbelt technology. When a vehicle is hit on either of its sides, the risk of injury is closer between rear- and front-seated occupants than it was in the rear-end or frontal crashes previously studied. That said, differences in occupant protection were still observed between the rear and front seats, especially when the occupants studied were seated on the closest side of impact, or the near-side, and the vehicle was struck by another vehicle rather than sliding into an object such as a pole. Finally, this work projects great injury reduction benefits if a rear seat belt reminder system were to be widely implemented in the U.S. vehicle fleet. This dissertation presents a comprehensive investigation of the factors that contribute to rear-seated occupant injury and/or fatality through retrospective studies on rear, front, and side impacts. The overall goal of this dissertation is to better quantify the current risk of injury to rear-seated occupants under a variety of crash conditions, compare this to the current risk to front-seated occupants, and, when possible, identify how exactly injuries are occurring and ways in which they may be prevented in the future. The findings can benefit automakers who seek to improve the effectiveness of rear seat safety systems as well as regulatory agencies seeking to improve was vehicle tests targeting rear seat passenger vehicle safety.
Baltacioglu, Cem. "Production Of Chips And Crisp From Jerusalem Artichoke." Phd thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614084/index.pdf.
Full textC, 170°
C, 180°
C and 190°
C. When microwave oven was used samples were cooked for 60s, 75s, 90s, 105s, 120s, 135s and 150s at 600 Watt and 900 Watt. Rheological properties of Jerusalem artichoke puree were investigated and Xanthan gum (2%wb) and sodium metabisulphite (1%wb) added for the desired puree consistence and color. After the production of puree Jerusalem artichoke flour was produced and water added to this flour then dough obtained again. Rheological behaviour of the original puree and these prepared from the containing 1- 4.5 and 1 - 5.0 part water were quite similar. In the light of the experimental results obtained as frying temperature and treatment time increased, moisture content and lightness of the Jerusalem artichoke products have decreased but a*and b* values, hardness, fracture and oil content increased. The best results for frying of Jerusalem artichoke seem to be 180°
C with about 240s treatment time for the chips and the same temperature for 180s for the crisps. As microwave power level and duration of treatment increased, moisture content and lightness of the microwave cooked Jerusalem artichoke products have decreased, but a* and b* values increased. Hardness and fracturability values of the products first increased with time and then decreased. When microwave oven was used, the best results were obtained for about 105s treatment time at 600W for the Jerusalem artichoke chips and about 60s processing time at 900W for the crisp. Since treatment time for cooking was significantly reduced when microwave cooking was used, this method could be recommended as an alternative to conventional deep fat frying, as oil is not used as well.