Relevant bibliographies by topics / Thermo Mechanical system

Academic literature on the topic 'Thermo Mechanical system'

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Published: 14 March 2023

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Journal articles on the topic "Thermo Mechanical system"

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Venkatesan, J., S. P. Chidambaram, G. Nagarajan, Anand Suresh, and K. Saravanan. "Analysis of Thermo-Mechanical Behaviour of Air Compressor in Automotive Braking System." International Journal of Materials, Mechanics and Manufacturing 6, no. 3 (June 2018): 233–37. http://dx.doi.org/10.18178/ijmmm.2018.6.3.382.

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Kim, Sang-Woo, Dawit Zenebe Segu, and Seock-Sam Kim. "The Thermo-mechanical Cracking Analysis of Break System." Procedia Engineering 68 (2013): 586–92. http://dx.doi.org/10.1016/j.proeng.2013.12.225.

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Guo, Jianxia. "Calculation accuracy of mathematical homogenization method for thermo-mechanical coupling problems." Thermal Science 25, no. 4 Part B (2021): 2957–64. http://dx.doi.org/10.2298/tsci2104957g.

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The paper analyzes the thermo-mechanical couplinag phenomenon under the condition of sliding contact, establishes the finite element analysis continuous model of thermo-mechanical coupling, and proposes the system dynamic equilibrium equation and thermodynamic equilibrium equation. The article analyzes the contact conditions between the objects in the system and obtains the objects? contact conditions? mathematical expression. On this basis, the constraint function is used to express the mathematical homogenization. We apply the variation principle to the constraint function and form a non-linear equation group with the system balance equation solve the thermal-mechanical coupling problem. The example shows that we use the constraint function method to solve the thermo-mechanical coupling problem, which has good convergence, stable algorithm, and the calculation result can reflect the actual situation.
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Zeinali, Seyed Morteza, and Sherif L. Abdelaziz. "Identifying thermo-mechanical induced microstructural changes." E3S Web of Conferences 205 (2020): 09005. http://dx.doi.org/10.1051/e3sconf/202020509005.

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Robust engineering of geomaterials for energy applications requires a clear understanding of the impacts of temperatures and pressures applied to the soil on their microstructures. Such understandings will facilitate better designs of new geomaterials and technologies via ensuring accurate assessments of the performance of the existing ones. In this study, we assess the changes in the microstructure—specific surface area and pore size distribution—of a saturated clay subjected to stress and temperature cycle. Clay specimens were subjected to the desired mechanical stresses and thermal cycles in a triaxial system. Then, the specimens were swiftly extracted from the triaxial, flush frozen in liquid nitrogen, then freeze-dried to preserve their microstructure. The preserved specimens were then used for specific surface area and pore size distribution assessments using nitrogen (N2)-gas adsorption and mercury intrusion porosimetry. The results established qualitative explanations of the expected microstructural changes in geomaterials under operational conditions, which facilitate the development of new geomaterials that can overcome such alternations.
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Ouyang, C. "On crack propagation in a nonlinear coupled thermo-mechanical system." Mathematical Modelling 8 (1987): 519–23. http://dx.doi.org/10.1016/0270-0255(87)90636-1.

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Wang, Songke, Xiang Ji, Yuntao Song, Shanwen Zhang, Zhongwei Wang, Youwen Sun, Minzhong Qi, Xufeng Liu, Shengming Wang, and Damao Yao. "Thermo-mechanical analysis of RMP coil system for EAST tokamak." Fusion Engineering and Design 89, no. 7-8 (October 2014): 991–95. http://dx.doi.org/10.1016/j.fusengdes.2014.03.087.

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Saaly, Maryam, Pooneh Maghoul, and Hartmut Holländer. "Investigation of the effects of heat loss through below-grade envelope of buildings in urban areas on thermo-mechanical behaviour of geothermal piles." E3S Web of Conferences 205 (2020): 05010. http://dx.doi.org/10.1051/e3sconf/202020505010.

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Harvesting geothermal energy through the use of thermo-active pile systems is an eco-friendly technique to provide HVAC energy demand of buildings. Mechanical behaviour of thermo-active piles is impacted by thermal cycles. Moreover, in urban areas, the temperature of the ground is higher than non-constructed areas due to the heat loss through the below-grade enclosure of buildings. This heat dissipation increases the thermal capacity of the soil and affects the mechanical response of the geothermal pile foundation subjected to thermo-mechanical loading. To investigate the effect of buildings heat loss on thermo-active piles, a numerical thermo-mechanical (TM) analysis was carried out on a proposed energy foundation system for an institutional building, the Stanley Pauley Engineering Building (SPEB) in the campus of the University of Manitoba, Winnipeg, Canada. The mechanical response of the geothermal piles to the thermal cycles with and without considering heat leakage through the basement of the SPEB is compared. Results showed that the cooling loads induced a maximum vertical pile head displacement of -1.18 mm. After 5 years operation of the system, the maximum vertical pile head displacement decreased to -1.05 mm for the case in which heat loss through the basement in considered in the models. In addition, the maximum axial load effective along the pile axis was 6% higher for the case that considers heat loss through the basement compared to the case without considering heat leakage through the building’s below-grade envelope.
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Le Mercier, Kevin, Michel Watremez, Laurence Fouilland, Jean Dominique Guérin, and Laurent Dubar. "Thermo-Mechanical Behaviour of Spheroidal Graphite Iron." Key Engineering Materials 611-612 (May 2014): 1250–57. http://dx.doi.org/10.4028/www.scientific.net/kem.611-612.1250.

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The main objective of this paper is to identify the thermo-mechanical behaviour of the spheroidal graphite (SG) iron EN-GJS-700. In the first instance, compression tests are carried out using Gleeble 3500 system enabling a precise control on testing temperature and strain rate. The effects of these testing parameters on the SG iron behaviour are studied. Through this, the occurrence of dynamic recrystallization phenomenon is highlighted. Specific rheological models based on metallurgy are introduced. Finally, shear tests on hat shaped specimens are performed to reach higher strain rates.
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Ignaszak, Zenon, and Paweł Popielarski. "Sensitivity Tests of Simulation Models Used in Chosen Calculation Codes on Uncertainty of Thermo-Mechanical Parameters during Virtual Mechanical Stress Estimation for Ferrous Alloy Castings." Defect and Diffusion Forum 312-315 (April 2011): 758–63. http://dx.doi.org/10.4028/www.scientific.net/ddf.312-315.758.

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Simulation systems used for many years in foundry industry such as MAGMASOFT, NovaFlow&Solid and ProCAST, contain thermo-mechanical modules permitting the estimation of mechanical stresses and hot tears appearing in casting during its cooling. It is also known that these modules are rarely used because of the very limited thermo-mechanical database especially for ceramic materials such as foundry sand moulds. These technologies – castings pouring in non-permanent sand moulds, particularly iron alloys are most often applied in foundry. In our study the method of evaluating the algorithms quality applied in thermo-mechanical phenomena models based on parameters sensitivity testing from the proper database of the simulation system was used [1]. The comparative analyses of both experimental and virtual results were realized (by stress estimation). The methodology of experimental research was similar to that described where gray cast iron castings of stress bars (grid) were casted in sand mould bonded by organic resins.
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Lv, Jun, Minjie Shao, Yuting Xue, Xiaowei Gao, and Zhaoqian Xie. "A New Strong Form Technique for Thermo-Electro-Mechanical Behaviors of Piezoelectric Solids." Coatings 11, no. 6 (June 8, 2021): 687. http://dx.doi.org/10.3390/coatings11060687.

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Piezoelectric materials are widely fabricated and investigated for potential applications in microelectromechanical systems as direct converters between mechanical and electrical signals, where some show pyroelectric features involving thermo-electro-mechanical interactions. This study aimed to introduce a novel numerical technique to predict the thermo-electro-mechanical behaviors of piezoelectric structures, based on a strong-form numerical framework called the element differential method. In this method, the shape functions of the isoparametric element and their first two derivatives were derived analytically by interpolating the temperature, displacement, and electric potentials. Then, a point collocation method based on node positions in the elements was proposed to generate the final system of equations without any domain integrations. Thus, the coupled behaviors of thermal piezoelectric structures, including the pyroelectric features, can be simulated by the strong-form formulation of the governing equations. Several numerical examples, including the piezoelectric composites structures, are presented, and the coupled thermo-electro-mechanical responses have been analyzed to validate the proposed method.
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Dissertations / Theses on the topic "Thermo Mechanical system"

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Olofsson, Joel. "Thermo-mechanical analysis of cryo-cooled electrode system in COMSOL." Thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-353895.

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In the planned linear accelerator called Compact Linear Collider, CLIC, electrons and positrons will be accelerated to velocities near the speed of light. A limiting factor in accelerating structures are vacuum breakdowns, which are electrical discharges from a surface as a result of a large electric field being applied. In the preparatory studies for the CLIC, Uppsala University in collaboration with The European Organization for Nuclear Research, CERN, is building a DC Spark system to analyze vacuum breakdowns. This system containing large planar electrodes will be cooled down all the way down to around 4 K in order to limit the rate of wich vacuum breakdowns happen. When cooling a system like this, which consists of different components made of different materials there is the question of how the system will be affected. The objective of this project is to investigate how the cooling will affect the stability in terms of stresses and to analyze the cool down time of the system. Another goal is to make a material recommendation for a few parts based on the results. This will be done by simulating the cooling in COMSOL Multiphysics, which is a program that uses finite element analysis to solve complex problems where different branches of physics interact. The conclusion is that the system will most likely be stable as it is and there is no need to redesign it. The choice of recommended material is alumina with the reason being it should cause the least stress and the smallest gap between the electrodes when the cooling is done. There was no big difference in the cool down time between the materials. Further studies and simulations on the system is also recommended since there are many factors not taken into consideration in this study.
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Elschich, Ahmed. "Thermo-mechanical Fatigue of Electrical Insulation System in Electrical machine." Thesis, Karlstads universitet, Avdelningen för maskin- och materialteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-62579.

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Electrical machines in electrified heavy-duty vehicles are subjected to dynamic temperature loadings during normal operation due to the different driving conditions. The Electrical Insulation System (EIS) in a stator winding is aged as an effect of these dynamic thermal loads. The thermal loads are usually high constant temperatures and thermal cycling. The high average constant thermal load is well-known in the electrical machine industry but little is known about the effect of temperature cycling. In this project, the ageing of the EIS in stator windings due to temperature cycling is examined. In this project, computational simulations of different simplified models that represent the electrical insulation system are made to analyse the thermo-mechanical stresses that is induced due to thermal cycling. Furthermore, a test object was designed and simulated to replicate the stress levels obtained from the simulations. The test object is to ease the physical testing of electrical insulation system. Testing a complete stator takes time and has the disadvantage of having a high mass, therefore a test object is designed and a test method is provided. The results from the finite element analysis indicate that the mechanical stresses induced will affect the lifetime of the electrical insulation system. A sensitivity study of several thermal cycling parameters was performed, the stator core length, the cycle rate and the temperature cycle amplitude. The results obtained indicate that the stator core length is too short to have a significant effect on the thermo-mechanical stresses induced. The results of the sensitivity study of the temperature cycle rate and the temperature cycle amplitude showed that these parameters increase the thermo-mechanical stresses induced. The results from the simulations of the test object is similar to the results from the simulations of the stator windings, which means that the tests object is valid for testing. The test method that is most appropriate is the power cycling test method, because it replicates the actual application of stator windings. The thermally induced stresses exposing the slot insulation exceeds the yield strength of the material, therefore plastic deformation may occur only after one thermal cycle. The other components in the stator are exposed to stresses below the yield strength. The thermally induced stresses exposing the slot insulation are high enough to low cycle fatigue the electrical insulation system, thus thermo-mechanical fatigue is an ageing factor of the electrical insulation system.
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Chang, Gary Carleton University Dissertation Engineering Systems and Computer. "System identification and control of a thermo-mechanical pulping refiner." Ottawa, 1995.

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Krishnan, Ganesh. "Thermo-mechanical reliability of ultra-thin low-loss system-on-package substrates." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26474.

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Thesis (M. S.)--Materials Science and Engineering, Georgia Institute of Technology, 2009.
Committee Chair: Tummala, Rao; Committee Member: Pucha, Raghuram V.; Committee Member: Wong, C.P. Part of the SMARTech Electronic Thesis and Dissertation Collection.
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Christian, Corey D. (Corey Dwight). "Breaking the thermo-mechanical coupling of thermoelectric materials : determining the viability of a thermoelectric generator." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/121790.

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Thesis: S.M. in Engineering and Management, Massachusetts Institute of Technology, System Design and Management Program, 2019
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 69-70).
Thermoelectric power generators (TEGs) convert a temperature difference into electricity. This temperature difference can be created from waste heat. Since up to 50% [1] of US industrial energy input is lost as waste heat, an economical means of recovering waste heat and converting it into useful electricity could represent significant energy savings. Coupled with our integrative system design which involves creating application specific thermoelectric arrays, this technology can also help enable low power generation for off-grid needs in the developing world. Although conversion efficiencies as high as 20.9% [2] (heat to electrical energy) have been predicted from simulations of TEGs systems, in practice the efficiencies are typically only a few percent. Moreover, conventional systems often require expensive components to manage heat flow through the system.
As a result of the low efficiency and high system cost, electricity generated by thermoelectric energy harvesting from waste heat is currently not competitive with conventional electricity generation on a dollars-per-watt basis. This realization has led researchers to not only focus on increasing TEG device efficiency limits but to devise cheaper manufacturing processes and methods. A system design constraint that has not been fully investigated is the coupling of thermal and mechanical properties in thermoelectric materials. The extent to which this coupling affects the performance of the TEGs will be studied. This thesis develops an approach for decoupling the thermal and mechanical properties and tests it through a variety of simulations. We propose a mechanically compliant attachment strategy which could be integrated in various waste heat recovery applications.
The strategy involves breaking the thermal and mechanical bond formed by the brittle thermoelectric elements and its substrate. Copper wire, which is more pliable, is then used to connect the thermoelectric element to the substrate. A system analysis was performed for waste heat recovery from a vehicles exhaust pipe. We found that utilizing the proposed strategy should not only lead to increased mechanical compliance but can also lead to cost savings on a dollars-per-watt basis. We found that 84% power retention could be obtained when up to 16x less material is used under most apparent conditions¹.
by Corey D. Christian.
S.M. in Engineering and Management
S.M.inEngineeringandManagement Massachusetts Institute of Technology, System Design and Management Program
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Bitadze, Alexander. "Thermo-dynamical measurements for ATLAS Inner Detector (evaporative cooling system)." Thesis, University of Glasgow, 2014. http://theses.gla.ac.uk/5186/.

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During the construction, installation and initial operation of the Evaporative Cooling System for the ATLAS Inner Detector SCT Barrel Sub-detector, some performance characteristics were observed to be inconsistent with the original design specifications, therefore the assumptions made in the ATLAS Inner Detector TDR were revisited. The main concern arose because of unexpected pressure drops in the piping system from the end of the detector structure to the distribution racks. The author of this theses made a series of measurements of these pressure drops and the thermal behavior of SCT-Barrel cooling Stave. Tests were performed on the installed detector in the pit, and using a specially assembled full scale replica in the SR1 laboratory at CERN. This test setup has been used to perform extensive tests of the cooling performance of the system including measurements of pressure drops in different parts of system, studies of the thermal profile along the stave pipe for different running conditions / parameters and coolant flow measurements in the system. The pressure drops in the system and the associated temperatures in the barrel cooling loops have been studied as a function of the system variables, for example; input liquid pressure, vapour back pressure, module power load and input liquid temperature. Measurements were performed with 10, 11, 12, 13 barabs inlet liquid pressure in system, 1.2, 1.6, 2.0, 2.5, 3.0, 4.0, 5.0, 6.0 barabs vapour back pressure in system, and 0 W, 3 W, 6 W, 9 W, 10.5W power applied per silicon module. The measurements clearly show that the cooling system can not achieve the design evaporation temperature of -25C in every part of the detector (SCT Barrel loops) in case of 13 barabs nominal inlet liquid pressure, 1.2 barabs minimum possible back pressure and 6W nominal power per SCT Barrel silicon module and especially at the end of the ATLAS ID operation period when modules will work on full power of 10.5 W. This will lead to the problem of thermal run-away of the ATLAS SCT, especially near the end of the operational period after significant radiation exposure has occurred. The LHC luminosity profile, depletion voltage and leakage current values and the total power dissipated from the modules were revised. Thermal runaway limits for the ATLAS SCT sub-detector were also revised. Results show that coolants evaporation temperature necessary for the sub-detector's safe operation over the full lifetime (10 years) is -15C with a safety factor of 2. Laboratory measurements clearly show that the cooling system can not achieve even this necessary evaporation temperature of -15C. It is now impossible to make mechanical modifications to the cooling system, for example; changing the diameter of the cooling pipes, or the thermal performance of the in-system heat exchanger or reducing the vapour back pressure. It was therefore decided to investigate changes to the cooling fluid and to test mixtures of Hexafluoroethane (R116) C2F6 and Octafluoropropane(R218) C3F8 at differing ratios instead of just pure C3F8 coolant presently used. For this purpose, a new "blending" machine was assembled in the SR1 laboratory, with a new device an "on-line acoustic flow meter and fluorocarbon coolant mixture analyzer" (Sonar Analyzer) attached to it. The Machines were connected to the already existing laboratory test station and new extensive tests were performed to investigate different proportion of C3F8/C2F6 blends to find the mixture ratio which resulted in the best operational performance as measured by: the temperature distribution, pressure drops and flow parameters over the system, to ensure best cooling performance of SCT Barrel cooling loops for long term ATLAS SCT operation. Measurements were performed with different percentage of C2F6 (1%, 2%, 3%, 5%, 10%, 20%, 25%) coolant in the C3F8/C2F6 mixture, for different power (0 W, 3 W, 6 W, 9 W, 10.5W) applied to dummy modules on the SCT cooling stave, with 13 barabs inlet liquid pressure and for different vapour back pressures (1.2, 1.6, 2.0, 2.5, 3.0 barabs) in the system. Results prove that with 25% of C2F6 in the blend mixture, it is possible to lower the evaporation temperature by ~10C in the case of nominal operation parameters of the system. The ATLAS Inner Detector Evaporative Cooling System can therefore reach the necessary evaporation temperature and therefore can guarantee thermal stability of the SCT, even at the end of the operation period.
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Popov, Anton. "Three-dimensional thermo-mechanical modeling of deformation at plate boundaries : case study San Andreas Fault System." Phd thesis, Universität Potsdam, 2008. http://opus.kobv.de/ubp/volltexte/2009/3187/.

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It has always been enigmatic which processes control the accretion of the North American terranes towards the Pacific plate and the landward migration of the San Andreas plate boundary. One of the theories suggests that the Pacific plate first cools and captures the uprising mantle in the slab window, and then it causes the accretion of the continental crustal blocks. The alternative theory attributes the accretion to the capture of Farallon plate fragments (microplates) stalled in the ceased Farallon-North America subduction zone. Quantitative judgement between these two end-member concepts requires a 3D thermomechanical numerical modeling. However, the software tool required for such modeling is not available at present in the geodynamic modeling community. The major aim of the presented work is comprised basically of two interconnected tasks. The first task is the development and testing of the research Finite Element code with sufficiently advanced facilities to perform the three-dimensional geological time scale simulations of lithospheric deformation. The second task consists in the application of the developed tool to the Neogene deformations of the crust and the mantle along the San Andreas Fault System in Central and northern California. The geological time scale modeling of lithospheric deformation poses numerous conceptual and implementation challenges for the software tools. Among them is the necessity to handle the brittle-ductile transition within the single computational domain, adequately represent the rock rheology in a broad range of temperatures and stresses, and resolve the extreme deformations of the free surface and internal boundaries. In the framework of this thesis the new Finite Element code (SLIM3D) has been successfully developed and tested. This code includes a coupled thermo-mechanical treatment of deformation processes and allows for an elasto-visco-plastic rheology with diffusion, dislocation and Peierls creep mechanisms and Mohr-Coulomb plasticity. The code incorporates an Arbitrary Lagrangian Eulerian formulation with free surface and Winkler boundary conditions. The modeling technique developed is used to study the aspects influencing the Neogene lithospheric deformation in central and northern California. The model setup is focused on the interaction between three major tectonic elements in the region: the North America plate, the Pacific plate and the Gorda plate, which join together near the Mendocino Triple Junction. Among the modeled effects is the influence of asthenosphere upwelling in the opening slab window on the overlying North American plate. The models also incorporate the captured microplate remnants in the fossil Farallon subduction zone, simplified subducting Gorda slab, and prominent crustal heterogeneity such as the Salinian block. The results show that heating of the mantle roots beneath the older fault zones and the transpression related to fault stepping, altogether, render cooling in the slab window alone incapable to explain eastward migration of the plate boundary. From the viewpoint of the thermomechanical modeling, the results confirm the geological concept, which assumes that a series of microplate capture events has been the primary reason of the inland migration of the San Andreas plate boundary over the recent 20 Ma. The remnants of the Farallon slab, stalled in the fossil subduction zone, create much stronger heterogeneity in the mantle than the cooling of the uprising asthenosphere, providing the more efficient and direct way for transferring the North American terranes to Pacific plate. The models demonstrate that a high effective friction coefficient on major faults fails to predict the distinct zones of strain localization in the brittle crust. The magnitude of friction coefficient inferred from the modeling is about 0.075, which is far less than typical values 0.6 – 0.8 obtained by variety of borehole stress measurements and laboratory data. Therefore, the model results presented in this thesis provide additional independent constrain which supports the “weak-fault” hypothesis in the long-term ongoing debate over the strength of major faults in the SAFS.
Seit jeher rätselhaft sind die Prozesse, die die Akkretion der Nordamerikanischen Terranen in Richtung der Pazifischen Platte sowie die Wanderung der Plattengrenze der San-Andreas-Verwerfung in Richtung Festland bestimmen. Eine Theorie besagt, dass sich die Pazifische Platte erst abkühlt und den aufsteigenden Mantel im „Slab Window“ fängt und somit die Akkretion der kontinentalen Krustenblöcke bewirkt. Die andere Theorie geht von einer Akkretion durch das Fangen von Teilen der Farallon-Platte (Mikroplatten) aus, die in der inaktiven nordamerikanischen Farallon-Subduktionszone fest stecken. Die quantitative Beurteilung dieser beiden gegensätzlichen Konzepte erfordert eine thermomechanische numerische 3-D-Modellierung. Das dafür benötigte Software Tool steht jedoch der geodynamischen Modellierung derzeit noch nicht zur Verfügung. Das Hauptziel der vorliegenden Arbeit umfasst im Wesentlichen zwei miteinander verbundene Aufgaben. Die erste besteht in der Entwicklung und Erprobung des Finite-Element-Codes, dessen Eigenschaften den hohen Anforderungen an die Ausführung der dreidimensionalen Simulationen lithosphärischer Deformation auf geologischer Zeitskala gerecht werden müssen. Die zweite Aufgabe ist die Anwendung des entwickelten Tools auf die neogenen Deformationen der Kruste und des Mantels entlang der San-Andreas-Verwerfung in Zentral- und Nordkalifornien. Die Modellierung auf geologischer Zeitskala lithosphärischer Deformation bringt für die Software Tools in Bezug auf Konzept und Durchführung zahlreiche Herausforderungen mit sich. Unter anderem gilt es, den Brittle-Ductile-Übergang in einem einzigen Modell sowie die Gesteinsrheologie in einer breiten Spanne unterschiedlicher Temperaturen und Spannungen adäquat darzustellen und die extremen Deformationen der freien Oberfläche und internen Grenzen aufzulösen. Im Rahmen der vorliegenden Arbeit erfolgte die erfolgreiche Entwicklung und Erprobung des neuen Finite-Element-Codes (SLIM3D). Dieser Code beinhaltet eine gekoppelte thermomechanische Behandlung von Deformationsprozessen und ermöglicht eine elasto-visko-plastische Rheologie mit Diffusion, Dislokation, Peierls Kriechmechanismen und Mohr-Coulomb-Plastizität. Der Code verbindet eine Arbitrary Lagrangian-Eulerian kinematische Formulierung mit freien Oberflächen- und Winkler-Randbedingungen. Das entwickelte Modellierungsverfahren wird für die Untersuchung der Aspekte verwendet, die die neogene lithosphärische Deformation in Zentral- und Nordkalifornien beeinflussen. Die Modellanordnung konzentriert sich auf die Interaktion zwischen drei großen tektonischen Elementen in dieser Region: die Nordamerikanische Platte, die Pazifische Platte sowie die Gorda-Platte, die sich in der Mendocino-Triple-Junction treffen. Unter anderem verdeutlicht die Modellierung den Einfluss des Aufsteigens der Asthenosphäre in das sich öffnende „slab window“ der übergelagerten Nordamerikanischen Platte. Die Modelle beziehen auch die angelagerten Überreste der Mikroplatten in der fossilen Farallon-Subduktionszone, die vereinfachte subduzierende Gorda-Platte sowie markante Heterogenitäten der Kruste, wie beispielsweise den „Salinian Block“, mit ein. Die Ergebnisse zeigen, dass die Erwärmung der Mantellithosphäre unter den älteren Störungszonen sowie die Transpression eine Abkühlung im „Slab Window“ als alleinige Begründung für die Ostwärtsbewegung der Plattengrenze nicht zulassen. Aus Sicht der thermomechanischen Modellierung bestätigen die Ergebnisse das geologische Konzept, welches durch das mehrmalige Fangen von Mikroplatten den Hauptgrund für die Wanderung der Plattengrenze der San-Andreas-Verwerfung in Richtung Festland über die letzten 20 Millionen Jahre sieht. Die Überreste der Farallon-Platte, die in der fossilen Subduktionszone gefangen sind, verursachen im Mantel eine wesentlich stärkere Heterogenität als die Abkühlung der Asthenosphäre und stellen somit den effizienteren und direkteren Weg für die Anlagerung der nordamerikanischen Gebiete an die Pazifische Platte dar. Die Modelle demonstrieren, dass ein hoher effektiver Reibungskoeffizient an großen Störungen nicht in der Lage ist, die eindeutigen Zonen der Dehnungslokalisierung in der spröden Kruste vorherzusagen. Die Größe des Reibungskoeffizienten, die sich aus der Modellierung ableitet, beträgt etwa 0,075 und ist damit wesentlich kleiner als die durch unterschiedliche Bohrlochmessungen und Labordaten ermittelten Spannungswerte zwischen 0,6 und 0,8. Daher liefern die in dieser Arbeit präsentierten Ergebnisse der Modelle in der seit langem geführten Debatte über die Stärke von großen Störungen in der San-Andreas-Verwerfung eine zusätzliche unabhängige Begründung der „Weak-Fault“-Hypothese.
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Amin, Abdullah Al. "MULTISCALE MULTIPHYSICS THERMO-MECHANICAL MODELING OF AN MGB2 BASED CONDUCTION COOLED MRI MAGNET SYSTEM." Case Western Reserve University School of Graduate Studies / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=case151385068164148.

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Ngaradoumbe, Nanhornguè Ronel. "Sensitivity analysis applied to fem models for coupled multiphase system." Doctoral thesis, Università degli studi di Padova, 2010. http://hdl.handle.net/11577/3421559.

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Coupled multiphysics problems are very actual research topics in civil engineering. In this work we focus on multiphase models for concrete exposed to high temperature, applicable to the evaluation of re resistance in industrial and civil concrete structures. Many non-linear phenomena and interactions are involved in concrete behaviour when temperatures higher than the standard ones are considered. Such phenomena involve not only heat conduction and vapour diffusion, but also liquid water ow caused by pressure gradients, capillary effects, adsorbed water content gradients, as well as latent heat transfer due to water phase change inside the pores. Moreover, high temperatures induce severe micro-structural changes and several interacting physical and chemical phenomena, resulting in signicant changes of the material inner structure and properties. During modelling of hygro-thermal-mechanical behaviour of concrete, one should use models considering possibly the whole complexity and mutual interactions of the analysed physical processes. The use of fully coupled multiphase models, based on mechanics of multiphase porous media, is therefore necessary to correctly predict the hygro, thermal, chemical and mechanical behaviour of this material, including damage effects. These models are nevertheless very complex and sophisticated because they are dealing with several elds strongly coupled, they are characterized by sets of coupled, nonlinear, differential equations and they require a large number of material parameters. Moreover, as it is well known, the computer solution of such large set of equations needs rather long computer times when applied to real life problems and can be therefore quite expensive. From this stems the necessity to reduce both the number of parameters to be determined accurately by experiments, and the computing time. Hence, a sensitivity analysis of the model with respect to variations of its parameters is needed, to be able to distinguish how sensitive is the solution to variations of the parameters of the equation set. Such an analysis reveals which are the main control parameters in the model and which are the effects of parameter changes, suggesting which parameters should be determined in an accurate way and which can simply be found from literature. The identication of parameters inuence should also allows to proceed to a simplication of the mathematical model (model reduction). The aim of this thesis is the sensitivity analysis of a nite element model (Comes-HTC) for the analysis of the behaviour of concrete exposed to high temperature; the sensitivity analysis has been performed with the automatic differentiation (AD) technique. The application of AD to the fem code Comes-HTC has allowed to develop an ecient tool for the computation of the sensitivity coecients, which has enabled to quantify the effect and relative importance of the material parameters with regards to the different model outputs. The results obtained allow for a better understanding of physical phenomena described by the Comes-HTC; they also highlight the full coupling between the hygral, thermal and mechanical eld that impacts on the link between model variables and material parameters.
I problemi che accoppiano vari campi della sica sono temi molto attuali nell'ambito dell'ingegneria civile. Il presente lavoro prende in esame modelli multifase per lo studio di calcestruzzi sottoposti ad alte temperature, applicabili per la valutazione della resistenza al fuoco di strutture civili o industriali. Numerosi fenomeni non lineari interessano il comportamento del calcestruzzo quando si considerano temperature elevate; tali fenomeni riguardano non solo la conduzione di calore e la diffusione di vapore, ma anche il trasferimento di calore latente provocato dal cambiamento di fase dell'acqua all'interno dei pori ed il usso d'acqua causato da gradienti di pressione, da effetti capillari, da gradienti del contenuto di acqua adsorbita. Inoltre le alte temperature causano forti cambiamenti microstrutturali e fanno sì che si sviluppino diversi fenomeni sici e chimici interagenti fra di loro, che provocano variazioni signicative della struttura interna e delle proprietà del materiale. Nella modellazione del comportamento igro-termo-meccanico del calcestruzzo, si dovrebbero utilizzare modelli che considerano la complessità e le interazioni dei processi sici descritti in precedenza. L'utilizzo di modelli accoppiati multifase, basati sulla meccanica dei mezzi porosi, si dimostra pertanto uno strumento necessario per una corretta previsione del comportamento igrometrico, termico, chimico e meccanico di tale materiale. Questi modelli sono tuttavia molto complessi e sosticati, perché hanno a che fare con parecchi campi fortemente accoppiati, sono caratterizzati da sistemi accoppiati di equazioni differenziali non lineari e richiedono un gran numero di parametri del materiale. Inoltre, nelle applicazioni di interesse pratico, la soluzione numerica di tali sistemi di equazioni richiede notevoli tempi di calcolo risultando quindi piuttosto costosa. Nasce quindi l'esigenza di ridurre sia l'onere richiesto dalla determinazione sperimentale dei parametri necessari, sia i tempi computazionali. Per poter procedere in questo senso serve quindi un'analisi della sensitività del modello rispetto alla variazione dei suoi parametri, per poter individuare in che modo la soluzione venga inuenzata dalla variazione dei parametri che compaiono nei sistemi di equazioni. Tale analisi rivela quali sono i parametri che controllano il modello e quali sono gli effetti delle loro variazioni, permettendo quindi di individuare i parametri la cui determinazione precisa è essenziale per l'accuratezza dei risultati e distinguerli da quelli la cui determinazione può essere meno precisa o che possono essere reperiti in letteratura. Dopo aver eseguito tale analisi, si potrà procedere ad una semplicazione del modello matematico, con effetti beneci anche sui tempi di calcolo, ed avviare in questo modo un processo di "model reduction". Lo scopo di questa tesi è l'analisi di sensitività di un modello agli elementi finiti (Comes-HTC) per l'analisi del comportamento del calcestruzzo esposto ad alte temperature; l'analisi di sensitività è stata eettuata attraverso la differenziazione automatica (AD). L'applicazione di questa tecnica al codice fem Comes-HTC ha permesso di sviluppare uno strumento eciente per il calcolo dei coecienti di sensitività, attraverso il quale è stato possibile quanticare gli effetti e l'importanza relativa dei parametri del materiale sull'insieme di soluzioni calcolate dal modello. I risultati ottenuti hanno consentito una migliore comprensione dei fenomeni sici descritti dal codice Comes-HTC, evidenziando anche il forte accoppiamento tra il campo igrometrico, termico e meccanico che inuisce sul legame tra le variabili del modello e i parametri del materiale.
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Ismail, Dahman, and Alexis Andrei. "Thermomechanical stress analysis of the main insulation system of traction electrical machines." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-20305.

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More efficiency heavy-duty vehicles are developed with higher range, updated electronic and mechanical parts. The fuel efficiency and pollution of carbon dioxide need to be lower to achieve new EU regulations. The global population increases with an increased number of heavy-duty vehicles. This, in turn, increases the emission. By taking the electrical and mechanical parts to the next step, the global emission problems can be massively reduced. Electrical machines are the next step towards a cleaner future. The main goal of this study to investigate the electrical machine’s insulation system. Thermo-mechanical stresses due to thermal cycling affect the electrical machines and its sub-components. By using a FEM application with simplified models of the electrical machine, results are obtained and discussed. Specifically, if 2D-models are sufficient enough to represent a 3D-model. How good different 2D-models can represent the 3D-model is compared and discussed in this study. A physical experimental analysis is done to verify and calibrate the FE-models. Which one of the less frequent higher amplitude or more frequent, lower amplitude thermal cycling affects the insulation system most is determined. The simulations could be done with either, coupled-temperature displacement analysis or sequentially coupled analysis. Coupled-temperature displacement is the fastest method to use in the simulation models. A 3D-model is the best way to describe an object and is therefore implemented. Two additional 2D-models are developed for faster computation and to investigate if the models can represent the three-dimensional geometry. All the models have specific boundary conditions to make the models more simplified. Sensitivity studies have been done to determine which parameter affects the induced thermo-mechanical stresses the most. A physical experimental setup is also implemented to validate and calibrate the simulation model. The result of the 3D-model is most accurate when simulating a three-dimensional object. Simulation results have shown that epoxy, one of the main components in the insulation system, is most critical in terms of reaching breakdown first, followed by paper insulation and copper coating. This is a typical result of all three simulation models. Whereas it is concluded that some 2D-models can present the 3D-model, others can’t. The dependent factor is the different cross-section of the electrical machine. The physical experiment shows similar results between simulation in terms of strain at a lower temperature, and the deviation gets larger as the temperature increases. The 3D-model is the model that has the best representation of a real electrical machine as it accounts for all the normal and shear stress components in all directions, but also because it has better boundary conditions compared to the 2D-models. The 2D-model in XY-plane has shown similar results to the 3D-model. One of the main insulation system components, epoxy, is exposed to the highest stresses compared to its yield and ultimate strength, followed by the paper insulation and copper coating. The sensitivity study has concluded that the axial length of the stator does not affect the stress amplitudes. The most critical parameter that affects the thermo-mechanical stresses is the temperature amplitude, the materials CTE and the thickness of the jointed layer. All maximum stress amplitudes of all the components are located at the free end.
Mer effektiva tunga fordon utvecklas med högre räckvidd, uppdaterade elektroniska och mekaniska delar. Bränsleeffektiviteten och föroreningen av koldioxid måste vara lägre för att uppnå nya EU-förordningar. Antalet tunga fordon ökar i takt med att den globala befolkningen ökar, detta leder i sin tur till ökad utsläpp av bland annat koldioxid. Genom att ta de elektriska och mekaniska delarna till nästa steg kan de globala utsläppsproblemen minskas massivt. Elektriska maskiner för framdrivning är nästa steg mot en renare framtid. Studiens huvudmål för att undersöka den elektriska maskinens isoleringssystem. Termomekaniska påfrestningar på grund av termisk cykling påverkar de elektriska maskinerna och dess delkomponenter. Genom att använda en FEM-applikation med förenklade modeller av den elektriska maskinen erhålls och diskuteras resultat. Specifikt om 2D-modeller är tillräckliga för att representera en 3D-modell. Hur tillräckligt de olika 2D-modeller kan representera 3D-modellen jämförs och diskuteras i denna studie. Ett fysiskt experiment utförs för att validera och kalibrera FEA-modellerna. Vilken av de mindre frekventa cykler med högre amplitud eller mer frekventa cyckler med lägre amplitud påverkar isoleringssystemet mest har undersökts. Simuleringarna kan göras med antingen, temperatur kopplad förskjutnings analys eller sekventiellt kopplad analys. Temperatur kopplad kopplad förskjutning är den snabbaste metoden att använda i simuleringsmodellerna. En 3D-modell är det bästa sättet att beskriva ett objekt och har därför implementerats. Ytterligare två, 2Dmodeller är framtagna i FEM-miljö för snabbare beräkning och för att undersöka om 2D-modellerna kan representera den tredimensionella geometrin. Samtliga tre modeller har specifika randvillkor för att förenkla modellerna. Känslighetsstudier görs för att bestämma vilken parameter som påverkar de inducerade termomekaniska spänningarna mest. Ett fysiskt experiment har utförsts för att validera och kalibrera simuleringsmodellerna. Resultatet visar att 3D-modellen representerar ett tre dimensonellt objekt bäst. Simuleringsresultat har visat att epoxy, som är en av huvudkomponenterna i isoleringssystemet, är mest kritisk när det gäller att först nå brott- och sträckgräns, följt av pappersisolering och koppar beläggningen. Detta är ett typiskt resultat av alla tre simuleringsmodeller. Slutsatsen visar att vissa 2D-modeller kan presentera 3D-modellen, andra kan inte. Den beroende faktorn beror på ur vilket tvärsnitt man tittar på den elektriska maskinen. Det fysiska experimentet visar liknande resultat jämfört med simuleringen när det gäller belastning vid en lägre temperatur, och avvikelsen blir större när temperaturen ökar. 3D-modellen, är den modell som har den bästa representationen av en riktig elektrisk maskin eftersom den inkluderar normal- och skjuvspänningskomponenter i alla riktningar. Anledningen är att den har bättre randvillkor jämfört med 2Dmodellerna. 2D-modellen i XY-planet har visat liknande resultat som 3D-modellen. En av huvudkomponenterna i isoleringssystemet, epoxy, utsätts för de högsta spänningarna jämfört med dess sträck- och den brottgräns, följt av pappersisolering och koppar beläggning. Känslighetsstudien har kommit fram till att statorns axiella längd inte påverkar spänningsamplituderna. Den mest kritiska parametern som påverkar de termomekaniska spänningarna är temperatur amplituden, materialens CTE och tjockleken på det skarvade skiktet. Alla maximala spänningsamplituder för samtliga tre komponenter är belägna i den fria änden.
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Books on the topic "Thermo Mechanical system"

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United States. National Aeronautics and Space Administration., ed. Mechanical system reliability for long life space systems: Final report. Nashville, Tenn: Dept. of Mechanical Engineering, Vanderbilt University, 1994.

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1938-, Stephansson Ove, Hudson J. A, and Jing Lanru, eds. Coupled thermo-hydro-mechanical processes in geo-systems: Fundamentals, modelling, experiments, and applications. Boston: Elsevier, 2004.

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GeoProc2003, (2003 Stockholm Sweden). Coupled thermo-hydro-mechanical-chemical processes in geo-systems: Fundamentals, modelling, experiments and applications. Amsterdam: Elsevier, 2004.

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E, Kennedy F., United States. Office of Naval Research., and Workshop on Thermomechanical Effects in Sliding Systems (3rd : 1984 : Dartmouth College), eds. Thermomechanical effects in sliding systems. Lausanne: Elsevier Sequoia S.A., 1985.

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A, Bajura R., Marston C. H. 1932-, Tsatsaronis G, American Society of Mechanical Engineers. Winter Meeting. (1989 : San Francisco, Calif.), American Society of Mechanical Engineers. Advanced Energy Systems Division., American Society of Mechanical Engineers. Advanced Energy Systems Division. Systems Analysis Committee., and Symposium on the Analysis and Design of Energy Systems (1989 : San Francisco, CA), eds. Analysis and design of energy systems: Computer-aided engineering : presented at the Winter Annual Meeting of the American Society of Mechanical Engineers, San Francisco, California, December 10-15, 1989. New York, NY: The Society, 1989.

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H, Amon Cristina, American Society of Mechanical Engineers. Heat Transfer Division., American Society of Mechanical Engineers. Electrical and Electronic Packaging Division., and International Mechanical Engineering Congress and Exposition (1995 : San Francisco, Calif.), eds. Cooling and thermal design of electronic systems: Presented at the 1995 ASME International Mechanical Engineering Congress and Exposition, November 12-17, 1995, San Francisco, California. New York: American Society of Mechanical Engineers, 1995.

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Karl-Heinz, Remmers, and Schnauss Martin, eds. Solar thermal systems: Successful planning and construction. Berlin: Solarpraxis, 2002.

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Yuriy, Pyr'yev, ed. Nonsmooth dynamics of contacting thermoelastic bodies. New York, NY: Springer, 2009.

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Evtushenko, Sergej, and Viktor Logvinov. Resistance of materials. Laboratory works. 4th edition. 4th ed. ru: Publishing Center RIOR, 2016. http://dx.doi.org/10.12737/16966.

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Data on laboratory works on resistance of materials are provided, the assessment of errors of results of measurements and experiments is given, statistical processing of experimental data is in detail stated. The book contains information on nondestructive methods and control devices of characteristics and diagnostics of materials and designs. In a grant the International system of units (SI) (tab. 1 of the Appendix) is used, designations of sizes are accepted according to the international recommendations of ISO. Data on physicomechanical characteristics of steel, cast iron, non-ferrous metals, wood and polymers and the allowed tension for them are provided in tab. 2-8 of the Appendix. The grant is intended for the students studying courses of resistance of materials, mechanics of materials and designs, applied mechanics, construction mechanics and construction designs.
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Nazarov, Vyacheslav, Roman Sandu, and Dmitriy Makarenkov. Technique and technology of combined processing of solid waste. ru: INFRA-M Academic Publishing LLC., 2020. http://dx.doi.org/10.12737/996365.

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The educational manual provides information about industrial and domestic waste. The properties of the lithosphere and the soil components. The estimation of soil pollution by industrial and household waste. The peculiarities of classification of wastes and provides criteria for determining risk. Describe the General pattern of the combined methods of processing that use mechanical, physical, thermal and biothermal recycling processes. In detail the construction described granulating equipment, methods of intensification of processes, process flow sheets and engineering calculation methods. Special attention is given to the thermal methods of waste treatment, process lines, constructions of furnaces and reactors. On the basis of the system approach with use of data of environmental monitoring are considered the methodology for selecting the most available technology. Meets the requirements of Federal state educational standards of higher education of the last generation. Intended for independent work of undergraduates majoring in 20.04.01 "Technospheric safety" (master level), 20.03.01 "Technosphere safety" (bachelor level), 18.03.01 "Chemical technology" 18.03.02 "Energy and resource saving processes in chemical technology, petrochemistry and biotechnology". Can be useful for engineers and technicians of chemical industry and related industries.
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Book chapters on the topic "Thermo Mechanical system"

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Balanza, R., and J. Román. "CESA-1. Control, System & Cycle Operation & Status Report." In Thermo-Mechanical Solar Power Plants, 221–25. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5402-1_34.

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Geyer, M. "A Modularized Sensible Heat Storage System for Process Heat Generation." In Thermo-Mechanical Solar Power Plants, 352–62. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5402-1_53.

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Yoshikawa, H., and N. Ikeda. "Evaluation of Sodium and Steam System Design for the Solar Power Plant with Central Receiver Tower." In Thermo-Mechanical Solar Power Plants, 194–99. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5402-1_30.

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De Benedetti, A., and C. Sala. "The Advanced Sodium Receiver (ASR) for the IEA/SSPS Central Tower Plant: Operative Conditions, Control System Design and Performances." In Thermo-Mechanical Solar Power Plants, 200–208. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5402-1_31.

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Hao, Zhili. "Electro-Thermo-Mechanical System: Thermoelastic Damping in Resonators." In Encyclopedia of Thermal Stresses, 1222–37. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-2739-7_309.

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Cavalleri, P., V. Bedogni, and A. di Meglio. "Relevant Aspects in the Design and Construction of the Advanced Sodium Receiver ASR for the IEA-SSPS Central Receiver System Plant (Almeria — Spain)." In Thermo-Mechanical Solar Power Plants, 155–61. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5402-1_24.

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White, G., A. Mueller, and G. Torrington. "A Thermal Imaging System for Crack Growth Quantification in Thermo-Mechanical Fatigue Specimens." In Review of Progress in Quantitative Nondestructive Evaluation, 1961–67. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-0383-1_257.

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Moakhar, Sonda, Hamdi Hentati, Maher Barkallah, Jamel Louati, and Mohamed Haddar. "Analysis of a Three Dimensional Multiphysics System—Application to Thermo-Mechanical Simulation of Shearing." In Lecture Notes in Mechanical Engineering, 113–23. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-46729-6_12.

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MohammadiFirouz, Reza, Eduardo Pereira, and Joaquim Barros. "Thermo-mechanical Bonding Behaviour of CFRP NSM System Using Cement-Based Adhesive." In Lecture Notes in Civil Engineering, 287–99. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-88166-5_24.

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Gayen, Debabrata, Rajiv Tiwari, and Debabrata Chakraborty. "Thermo-Mechanical Analysis of a Rotor-Bearing System Having a Functionally Graded Shaft with Transverse Breathing Cracks." In Lecture Notes in Mechanical Engineering, 93–104. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5701-9_8.

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Conference papers on the topic "Thermo Mechanical system"

1

Al-Khalil, Kamel. "Thermo-Mechanical Expulsive Deicing System - TMEDS." In 45th AIAA Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2007. http://dx.doi.org/10.2514/6.2007-692.

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Saettler, P., M. Hecker, M. Boettcher, C. Rudolph, and K. J. Wolter. "TSV-annealing: A thermo-mechanical assessment." In 2014 Electronics System-Integration Technology Conference (ESTC). IEEE, 2014. http://dx.doi.org/10.1109/estc.2014.6962712.

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Gielen, Alexander W. J., and Fidel Valega McKenzie. "Thermo-mechanical challenges for quantum devices." In 2014 Electronics System-Integration Technology Conference (ESTC). IEEE, 2014. http://dx.doi.org/10.1109/estc.2014.6962755.

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Solano, Rafael Familiar, Fa´bio Braga de Azevedo, Malcolm Carr, Leanne Tindall, Anderson Dolinski, and Carlos Eduardo Ingar Valer. "Thermo-Mechanical Design of Canapu PIP System." In ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/omae2009-79713.

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This paper discusses the thermo-mechanical design of the pipe-in-pipe (PIP) flowline installed in the Canapu field, located in Espi´rito Santo State, offshore Brazil. The pipeline is approximately 20km in length and connects the gas producing well 4-ESS-138 positioned in a depth of 1608m to Cidade de Vito´ria FPSO, located in Golfinho field. The Canapu PIP will operate under high pressure and temperature (HP/HT) conditions and is laid on the seabed. Due to the operational conditions, the thermo-mechanical design evaluated the susceptibility of the pipeline to the phenomenon of lateral buckling and pipeline walking in addition to free spanning and on-bottom stability. The lateral buckling behavior of the PIP is the major challenge for the design. It can be a safe and effective way to accommodate the thermal expansion of a hot pipeline, however high stress and strains can be developed in the buckles and a conventional stress based approach is not suited to design a pipeline that buckles laterally. The conventional stress limits are therefore relaxed and replaced by a strain limit. For this the methodology and recommendations of the SAFEBUCK JIP were adopted. The thermo-mechanical analysis selected a buckle initiation strategy based on distributed buoyancy. The strategy combines three distributed buoyancy triggers along the route together with the beneficial effect of the bathymetric out-of-straightness. The analysis shows that this initiation strategy is robust and highly reliable. From the start, this project represented a great challenge for Petrobras; it is the first PIP in Petrobras; has a low value specified for OHTC; and the pipeline is susceptible to lateral buckling. Besides all that, since the Canapu project was included among the priorities of Petrobras Plangas, it was executed as a fast track project.
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Sleiti, Ahmad K., and Mohammed Al-Khawaja. "Heat Transfer Analysis of Regenerative Thermo-Mechanical Refrigeration System." In ASME 2020 Heat Transfer Summer Conference collocated with the ASME 2020 Fluids Engineering Division Summer Meeting and the ASME 2020 18th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/ht2020-8901.

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Abstract Refrigeration systems contribute to the critical environmental concerns including global warming and ozone depletion. It is necessary to develop new systems that use renewable energy resources and waste heat to perform the cooling function with eco-friendly working fluids. This improves the energy efficiency of the power systems and minimizes the harmful effects of conventional refrigeration systems. This paper introduces an analysis of a regenerative thermo-mechanical refrigeration system that is powered with renewable heat sources (solar, geothermal) or waste heat (from internal combustion engines, gas power plants, and steam power plants). The system operates at the supercritical conditions of the working fluids. The performance of the system is evaluated based on power efficiency, the COP, and the expander-compressor diameters. Also, a number of working fluids were compared with each other based on their performance and environmental effects. There is a trade-off between high-performance fluids and their environmental effects. Using R32 as a working fluid at Th = 150 °C and Tc1 = 40 °C, the system produces a cooling capacity of 1 kW with power efficiency of 10.23%, expander diameter of 53.12 mm and compressor diameter of 75.4mm. The regenerator increases the power efficiency by about 1%. However, the size of the regenerator is small (Dr = 6.5 mm, Lr = 142 mm].
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Esparta, J. E., and S. M. Giusti. "Topological derivatives for thermo-mechanical semi-coupled system." In 10th World Congress on Computational Mechanics. São Paulo: Editora Edgard Blücher, 2014. http://dx.doi.org/10.5151/meceng-wccm2012-19623.

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Hintz, M., R. Dudek, I. Koch, F. Schindler-Saefkow, and A. Steinke. "Thermo mechanical behaviour of dies in multi material stacks." In 2010 3rd Electronic System-Integration Technology Conference (ESTC). IEEE, 2010. http://dx.doi.org/10.1109/estc.2010.5642886.

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Pillai, P. V., and I. W. Hunter. "Thermo-mechanical characterization of polypyrrole compliance using stochastic system identification." In 2009 Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 2009. http://dx.doi.org/10.1109/iembs.2009.5334477.

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Batarev, Sergey Vasilievich, Alexey Valerievich Grishin, Anton Aleksandrovich Zastylov, Mikhail Valerievich Zauzolkov, Oksana Nikolaevna Mansurova, and Pavel Aleksandrovich Sergeev. "SYSTEM OF CONTROL AND REGISTRATION OF THERMO-MECHANICAL TEST BENCH." In Молодежь в науке. Саров: ФГУП «Российский федеральный ядерный центр – Всероссийский научно-исследовательский институт экспериментальной физики», 2022. http://dx.doi.org/10.53403/9785951505200_494.

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Fischer, Wolfgang P. P., Mark Mueller, and Heiko Reinkober. "ULTIMATE: Metallic Thermal Protection System for Future RLV'S - Design and Thermo-mechanical Analyses –." In International Conference On Environmental Systems. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2003. http://dx.doi.org/10.4271/2003-01-2469.

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Reports on the topic "Thermo Mechanical system"

1

Hardy, Robert Douglas, David R. Bronowski, Moo Yul Lee, and John H. Hofer. Mechanical properties of thermal protection system materials. Office of Scientific and Technical Information (OSTI), June 2005. http://dx.doi.org/10.2172/923159.

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Hemphill, Jeff. Unsettled Issues in Drive-by-Wire and Automated Driving System Availability. SAE International, January 2022. http://dx.doi.org/10.4271/epr2022002.

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While many observers think that autonomy is right around the corner, there many unsettled issues. One such issue is availability, or how the vehicle behaves in the event of a failure of one of its systems such as those with the latest “by-wire” technologies. Handling of failures at a technical actuation level could involve many aspects, including time of operation after first fault, function/performance after first fault, and exposure after first fault. All of these and other issues are affected by software and electronic and mechanical hardware. Drive-by-wire and Automated Driving System Availability discusses the necessary systems approach required to address these issues. Establishing an industry path forward for these topics will simplify system development and provide a framework for consistent regulation and liability, which is an enabler for the launch of autonomous vehicles.
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Trubac, Kathryn, Caitlin Callaghan, Caylin Hartshorn, Tyler Elliott, Douglas Punt, and Christopher Donnelly. Cold regions vehicle start : cold performance of ultracapacitor-based batteries for Stryker vehicles. Engineer Research and Development Center (U.S.), October 2022. http://dx.doi.org/10.21079/11681/45640.

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Reliable vehicle start is necessary to support mission success, especially for response time. At Department of Defense installations in cold regions, vehicles using rechargeable battery and starter technologies have significant issues starting in the cold. Ultracapacitor engine start modules (ESMs) are an alternate technology to rechargeable lead-acid or lithium-ion batteries. The project develops a performance baseline for the ESM used in the M1126 Stryker Combat Vehicle under cold conditions. To test the performance of the ESMs in a cold room, a mechanical load system was constructed to replicate the load of starting a Stryker engine and instrumented with sensors to monitor parameters such as voltage, torque, and temperature. The ESMs were tested with the load system at temperatures from 24°C to −40°C. The results of the tests showed that there was some degradation of the ultracapacitor’s performance at the colder temperatures, which was expected, but no permanent damage. This work provides a test protocol and capability to evaluate next-generation vehicle battery systems for cold regions applications. Additionally, the ESM cold performance data establish a baseline to compare next-generation vehicle battery storage systems and to support cold regions missions and identify potential performance requirements for future vehicle battery system acquisition.
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Chopra, O. K. Estimation of mechanical properties of cast stainless steels during thermal aging in LWR systems. Office of Scientific and Technical Information (OSTI), October 1991. http://dx.doi.org/10.2172/142528.

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Mracek Dietrich, Anna, and Ravi Rajamani. Unsettled Issues Regarding the Certification of Electric Aircraft. SAE International, March 2021. http://dx.doi.org/10.4271/epr2021007.

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The aerospace industry is beginning to grapple with the reality of certifying electric aircraft (EA), signaling the maturing of the field. Many players are ramping up their activities to respond to imminent technical, safety, and regulatory requirements. While there are gaps in EA knowledge as well as the processes for certifying them, some leading standards development organizations (SDOs) such as SAE International, ASTM International, and RTCA—ably supported by representatives from regulatory agencies—are stepping in to address many of these issues. Of special importance are the new rule changes in the normal category (14 CFR Part 23, Amendment 64) that shift from a prescriptive philosophy to “performance-based rules.” Regarding system knowledge, there has been a trend in the use electrical energy to power systems that have long employed mechanical hydraulics. In the new EA paradigm, these components will be employed at criticality levels not previously witnessed in conventional aircraft, calling for a specific set of certification demands. Unsettled Issues Regarding the Certification of Electric Aircraft tackles the certification challenges faced by EA manufacturers in both the small (normal) and large (transport) categories, addressing technical, business, and process issues.
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Riveros, Guillermo, Felipe Acosta, Reena Patel, and Wayne Hodo. Computational mechanics of the paddlefish rostrum. Engineer Research and Development Center (U.S.), September 2021. http://dx.doi.org/10.21079/11681/41860.

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Purpose – The rostrum of a paddlefish provides hydrodynamic stability during feeding process in addition to detect the food using receptors that are randomly distributed in the rostrum. The exterior tissue of the rostrum covers the cartilage that surrounds the bones forming interlocking star shaped bones. Design/methodology/approach – The aim of this work is to assess the mechanical behavior of four finite element models varying the type of formulation as follows: linear-reduced integration, linear-full integration, quadratic-reduced integration and quadratic-full integration. Also presented is the load transfer mechanisms of the bone structure of the rostrum. Findings – Conclusions are based on comparison among the four models. There is no significant difference between integration orders for similar type of elements. Quadratic-reduced integration formulation resulted in lower structural stiffness compared with linear formulation as seen by higher displacements and stresses than using linearly formulated elements. It is concluded that second-order elements with reduced integration and can model accurately stress concentrations and distributions without over stiffening their general response. Originality/value – The use of advanced computational mechanics techniques to analyze the complex geometry and components of the paddlefish rostrum provides a viable avenue to gain fundamental understanding of the proper finite element formulation needed to successfully obtain the system behavior and hot spot locations.
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Saptsin, Vladimir, and Володимир Миколайович Соловйов. Relativistic quantum econophysics – new paradigms in complex systems modelling. [б.в.], July 2009. http://dx.doi.org/10.31812/0564/1134.

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This work deals with the new, relativistic direction in quantum econophysics, within the bounds of which a change of the classical paradigms in mathematical modelling of socio-economic system is offered. Classical physics proceeds from the hypothesis that immediate values of all the physical quantities, characterizing system’s state, exist and can be accurately measured in principle. Non-relativistic quantum mechanics does not reject the existence of the immediate values of the classical physical quantities, nevertheless not each of them can be simultaneously measured (the uncertainty principle). Relativistic quantum mechanics rejects the existence of the immediate values of any physical quantity in principle, and consequently the notion of the system state, including the notion of the wave function, which becomes rigorously nondefinable. The task of this work consists in econophysical analysis of the conceptual fundamentals and mathematical apparatus of the classical physics, relativity theory, non-relativistic and relativistic quantum mechanics, subject to the historical, psychological and philosophical aspects and modern state of the socio-economic modeling problem. We have shown that actually and, virtually, a long time ago, new paradigms of modeling were accepted in the quantum theory, within the bounds of which the notion of the physical quantity operator becomes the primary fundamental conception(operator is a mathematical image of the procedure, the action), description of the system dynamics becomes discrete and approximate in its essence, prediction of the future, even in the rough, is actually impossible when setting aside the aftereffect i.e. the memory. In consideration of the analysis conducted in the work we suggest new paradigms of the economical-mathematical modeling.
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Doyle, Jesse D., Nolan R. Hoffman, and M. Kelvin Taylor. Aircraft Arrestor System Panel Joint Improvement. U.S. Army Engineer Research and Development Center, August 2021. http://dx.doi.org/10.21079/11681/41342.

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Aircraft Arresting Systems (AAS) for military applications utilize sacrificial panels made of Ultra-High Molecular Weight polyethylene (UHMWPE) that are embedded into the pavement beneath the AAS cable to protect the pavement from cable damage. Problems have been observed with the materials and practices used to seal the UHMWPE panel joints from water and debris. Data obtained from laboratory and field studies were used make improvements to current practice for sealing UHMWPE panel joints. The study evaluated four joint-sealant materials, eight alternative surface treatment and preparation techniques to promote adhesion to UHMWPE, and seven joint-edge geometries. Bond-strength testing of joint-sealant specimens was conducted in the laboratory, followed by field evaluation of construction techniques. Field performance of the joint systems was monitored for 24 months after installation. Additionally, a thermal response model was developed to refine the joint design dimensions. Results confirmed that the best material to use was self-leveling silicone joint sealant. It was recommended that a dovetail groove be cut into the edge of UHMW panels to provide positive mechanical interlock and to reduce adhesive failures of the sealant. It was also recommended that the panel-to-panel joint-sealant reservoir be widened to prevent sealant compression damage.
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Yoozbashizadeh, Mahdi, and Forouzan Golshani. Robotic Parking Technology for Congestion Mitigation and Air Quality Control Around Park & Rides. Mineta Transportation Institute, June 2021. http://dx.doi.org/10.31979/mti.2021.1936.

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A lack or limited availability for parking may have multiple consequences, not the least of which is driver frustration, congestion, and air pollution. However, there is a greater problem that is not widely recognized by the public, namely the negative effect on the use of transit systems due to insufficient parking spaces close to key transit stations. Automated parking management systems, which have been successfully deployed in several European and Japanese cities, can manage parking needs at transit stations more effectively than other alternatives. Numerous studies have confirmed that quick and convenient automobile access to park-and-ride lots can be essential to making public transit competitive with the automobile in suburban areas. Automated parking systems use a robotic platform that carries each vehicle to one of the locations in a custom designed structure. Each location is designed compactly so that considerably more vehicles can be parked in the automated garages than the traditional parking lots. Central to the design of these systems are three key technologies, namely: 1. Mechanical design and the operation of vehicle transfer, i.e., the robotic platform 2. Structural and architectural requirements to meet safety and earthquake standards, among other design imperatives, 3. Automation and intelligent control issues as related to the overall operation and system engineering. This article concerns the first technology, and more specifically the design of the robotic platform for vehicle transfers. We will outline the overall design of the robot and the shuttle, followed by a description of the prototype that was developed in our laboratories. Subsequently, performance related issues and scalability of the current design will be analyzed.
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Mohanty, Subhasish, William Soppet, Saurin Majumdar, and Ken Natesan. System-Level Heat Transfer Analysis, Thermal- Mechanical Cyclic Stress Analysis, and Environmental Fatigue Modeling of a Two-Loop Pressurized Water Reactor. A Preliminary Study. Office of Scientific and Technical Information (OSTI), January 2015. http://dx.doi.org/10.2172/1179020.

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