Zeitschriftenartikel: „Structural analysis of the piston“

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Lalvani, J. Isaac Joshua Ramesh, E. Prakash, M. Parthasarathy, S. Jayaraj und K. Annamalai. „Structural Analysis on Swirling Grooved SCC Piston“. Advanced Materials Research 984-985 (Juli 2014): 452–55. http://dx.doi.org/10.4028/www.scientific.net/amr.984-985.452.

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This journal describes a study on the structural effects of DI diesel engine conventional piston and modified pistons. To enhance the combustion efficiency of the engine conventional piston has been modified as shallow depth piston bowl with swirling grooves on the piston crown. Three different widths (5.5mm, 6.5mm and 7.5mm) and constant depth (00 to 50) swirling grooves added on the shallow depth combustion chambered piston crown. The conventional piston and modified pistons has been modeled in CATIA software and structural analysis done in ANSYS 14. In structural analysis observed that deformation for the modified pistons are same and negligible as compared to the conventional piston.

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Higashimachi, Takao, Takahide Nakayama, Takenori Hirakawa und Hisato Sasahara. „Structural Analysis of a Universal Holding Mechanism for Piston Rings“. Journal of Robotics and Mechatronics 13, Nr. 3 (20.06.2001): 245–53. http://dx.doi.org/10.20965/jrm.2001.p0245.

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By fixing pistons of different diameters with 6 gripping nails, we clarified deformation of piston rings and stress during tightening by simulation based on the finite element method (FEM) as part of development of a universal holding mechanism to insert it into the cylinder block automatically. Nonlinear FEM was used to analyze slidingat contact parts between the ring and the gripping nail when fastening the piston ring. Final defohnation of the piston ring and stress on different parts were verified in detail. We confirmed that insertion of the piston by this method is possible.

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Tandon, Adhir. „Design, Optimization and Analysis of a 4-stroke Diesel Engine Piston and Piston rings using Different Materials“. SAMRIDDHI : A Journal of Physical Sciences, Engineering and Technology 10, Nr. 01 (25.07.2018): 71–80. http://dx.doi.org/10.18090/samriddhi.v10i01.10.

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Modern Automobiles expect a high performance from its engines, which in turn places its requirements on the piston and cylinder components. Hence the piston has to deal with harsher, and tougher thermal and mechanical conditions. It has to undergo higher operating temperatures and pressures as well as higher speeds and at the same time keeping a check on the emissions. Pistons play a key role in increasing engine efficiency by reducing weight and frictional losses. This has made it essential to devise and search unique and creative concepts and materials for Pistons repeatedly, which offers what the engine demands. In this work Aluminium Alloy-4032 has been selected as the piston material of a 4-Stroke Diesel Engine and the piston rings are made of grey cast iron and alloy steel. Piston is designed by analytical methods taking both thermal and structural effects into consideration, then modelled on CATIA V5 and the analysis of structural deformation due to thermal stresses has been done using Finite Element Analysis of Steady State Thermal and its effect on static structure using Analysis software ANSYS

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Kumar, Chandan, und Nilamber Kumar Singh. „Responses of Aluminium Alloy Pistons under Mechanical and Thermal Loads“. Materials Science Forum 969 (August 2019): 231–36. http://dx.doi.org/10.4028/www.scientific.net/msf.969.231.

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A comparative study of three different aluminium alloys, Al2618, Al4032 and Al6061 made internal combustion engine pistons is done on their responses under mechanical and thermal loads using finite element methods. In this study, a 3D solid model of piston is created in CATIA and the simulations of the static structural analysis, steady-state thermal analysis and transient thermal analysis are carried out in ANSYS. Stress and temperature distributions on critical areas of piston are pointed out for appropriate modification in piston design. The temperature and heat flux variations with time are presented in transient thermal analysis. Taguchi method and topological optimization are applied to optimize the process parameters and to select the appropriate material for the piston.

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Xie, Qiang, Cun Yun Pan, Hu Chen, Zheng Zhou Zhang und Lei Zhang. „Structural Modal Analysis of a New Twin-Rotor Piston Engine“. Applied Mechanics and Materials 390 (August 2013): 256–60. http://dx.doi.org/10.4028/www.scientific.net/amm.390.256.

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With the finite analysis software ANSYS, the key parts and the whole structure of a new twin-rotor piston engine is analyzed, and then the structural modal parameters are obtained by using finite element method in the cases of free modality. Furthermore, the natural vibration characteristics of the twin-rotor piston engine are analyzed, as well as the influence of structural parameters on vibration transfer and radiation noise. The research is expected to lay a foundation for the vibration reduction design of the twin-rotor piston engine.

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Folęga, Piotr, Rafał Burdzik und Łukasz Konieczny. „State of Stress Analysis for Structural Solutions of Combustion Engine Piston Pins“. Solid State Phenomena 236 (Juli 2015): 70–77. http://dx.doi.org/10.4028/www.scientific.net/ssp.236.70.

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This paper addresses a study undertaken to develop spatial numerical models of a piston, a piston pin and a connecting rod with reference to real components of a combustion engine crank system. The numerical studies conducted comprised an analysis of how the mechanical strength of piston pins was influenced depending on the change in their inner shape. For the purposes of calculations, various scenarios of shape modification were proposed for piston pins currently in use, enabling their weight to be reduced.

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Wang, Yan Xia, und Hui Gao. „Fatigue Strength& Analysis of Diesel Engine Piston on Finite Element Analysis“. Advanced Materials Research 156-157 (Oktober 2010): 1086–89. http://dx.doi.org/10.4028/www.scientific.net/amr.156-157.1086.

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In this work, the variational trend of the stresses for the diesel engine piston under the operation conditions is analyzed by using finite element method (FEM) and the fatigue strength of the diesel engine piston is evaluated. The muhiaxial stress was converted into the uniaxial stress with the maximum principal stress method, and the material curve is amended by Goodman’s amendment. Finally the fatigue life and the fatigue safety factor of the diesel engine piston is obtained, which provides a better reference for structural improvements and optimization for the design of the piston.

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Tian, Jingyi, Huihua Feng, Yuanjie Feng, Zhengwei Yang, Chengjun Zhu und Jiegui Li. „Piston dynamics analysis considering skirt-liner dynamic clearance“. Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 233, Nr. 13 (08.02.2019): 3538–53. http://dx.doi.org/10.1177/0954407019827339.

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Piston slap force is one of the main sources of mechanical engine noise. To obtain a more accurate determination of the piston slap force and minimize piston slap noise, a new simulation model that considers dynamic clearance of the piston skirt and liner has been established in this study. The skirt-liner dynamic clearance is caused mainly by the elastic deformation and thermal deformation of the piston. Comparing three different models, it was found that the impact of dynamic clearance on the piston slap force is reflected mainly in the medium-high frequency, which is the sensitive frequency of the slap noise. Therefore, it is necessary to consider dynamic clearance in the simulation model. In addition, the mechanisms behind the dynamic clearance effect on fluid lubrication, piston dynamics, and piston slap noise were observed. In particular, three typical structural parameters in piston dynamics (the piston pin offset, piston-liner clearance, and piston skirt profile) were studied. The analyses provide guidance for the design of low-noise engines.

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Hao, Ming, und Xiao Ye Qi. „Modeling Analysis and Simulation of Hydraulic Axial Piston Pump“. Advanced Materials Research 430-432 (Januar 2012): 1532–35. http://dx.doi.org/10.4028/www.scientific.net/amr.430-432.1532.

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Based on characteristics of AMESim software and structural characteristics of aviation piston pump, the model of a rational aviation piston pump was constructed after simplified. In this issue, the equations of motion of the piston and the process of oil suction and oil discharge for a single piston are theoretically analyzed. The effects of the four kinds of leakage to the loss of flow rate and to the pulsing of the pump are emphatically analyzed. Through build the model of axial piston pump, which provides certain theoretical basis for design different kinds of model of the piston pump.

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Gao, Sheng Yao, De Shi Wang und Qi Zheng Zhou. „Finite Element Analysis of the Thermal Field of Piston in an External Combustion Cam Engine“. Applied Mechanics and Materials 66-68 (Juli 2011): 1240–44. http://dx.doi.org/10.4028/www.scientific.net/amm.66-68.1240.

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As the most dominative component under stress in an external combustion cam engine, the working condition of piston is very rigor. Once new design type and technical improvement is applied, it is necessary to analysis its thermal load and take secure steps. And the finite element model on each conditions of thermal is calculated, which is used to estimate the temperature field and provide a theoretical basis for further structural strength analysis and optimization design. Choosing analysis results of the piston as reference and taking five structural parameters of the piston as design variables, two objective functions including piston mass and maximal Von Mises stress are respectively considered. The optimum design of the piston is executed and the results indicate that it is feasible to improve temperature field and strength of the piston. These results enrich and develop the research on structural analysis and optimization of spatial engine, which are of guiding significance for analyzing engine strength and related problem in theoretically.

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Sathishkumar, S., und Dr M. Kannan. „STRUCTURAL, THERMAL AND THERMO-MECHANICAL ANALYSIS OF FOUR STROKE PETROL ENGINE PISTON USING CAE TOOLS“. Acta Mechanica Malaysia 3, Nr. 1 (05.02.2020): 05–10. http://dx.doi.org/10.26480/amm.01.2020.05.10.

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As we are known numerous reciprocating parts is contained in IC Engine which are responsible for giving the motion. The abnormal piston working is given poor performance in comparison of other parts. The main intention of this research is to investigate and analyse the stress distribution of automobile piston at definite engine Condition. In this paper pressure (Mechanical), thermal (Heat) and thermo-mechanical analysis is accomplished by help of CAE Tool. The constraint used for the analysis is pressure of operating gas, temperature and material properties of piston. In this research piston are designed for a single cylinder four stroke petrol engine using CATIA V5R20 and analysis is performed by ANSYS 14. Two different material are induced in this investigation. First one is Aluminium alloy and second is Cast Iron. In this end of the Results are shown and a comparison is made to find the most suited material for splendour automobile vehicle piston by various CAE analyses.

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He, Zhenpeng. „Piston skirt friction loss and dynamic analyses based on FEM method“. Industrial Lubrication and Tribology 70, Nr. 4 (08.05.2018): 656–72. http://dx.doi.org/10.1108/ilt-12-2016-0320.

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Purpose The analysis carried out in this study can provide guidance for manufacturers and researchers to design a piston for the development of engines. Design/methodology/approach Running conditions for pistons have become very severe because of the high combustion pressure and increase in piston temperature in the past 10 years. The precision of the model has a great effect on the power transmission, vibration noise emission. In this paper, the model was established with lubrication and dynamic governing equations, which were solved using finite element method coupled with Runge–Kutta method. A piston of an inline six-cylinder engine was studied, and some structural parameters were used to investigate its effect on the friction loss with lubrication and dynamic motion theory. Findings Based on the analyses, the effect of the friction load at the oil groove and thermal deformation of piston skirt were added to the model, and some useful information about the friction loss and dynamic characteristics were compared. Originality/value All the results will provide guidance for the development of the piston and reduction in the friction loss and wear.

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Yu, Cheng Guo, Ze Bin Yu, Zong Zheng Liu und Huan Lai. „The Research on Vibration Analysis of Blow-Down Wind Tunnel Pressure Regulating Valves“. Applied Mechanics and Materials 397-400 (September 2013): 621–24. http://dx.doi.org/10.4028/www.scientific.net/amm.397-400.621.

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The pressure regulating valves are crucial segments to control the pressure of the stability chambers in the transonic and supersonic blow-down wind tunnels. To solve the valves vibration problem, the pistons and their supporting structures of three typical pressure regulating valves in China Aerodynamics Research and Development Center (CARDC) were analyzed based on the modal analysis theory. From the analysis, two conclusions were obtained that the supporting structures are more rigid than the pistons, and a rigid piston is of critical importance to the valves stiffness. The structural parameters comparing results of the pistons showed the same viewpoint. A new design pressure regulating valve demonstrating the successful application according to the conclusion above was presented.

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Du, Yun Peng, Guo Liang Hu und Fei Dong. „Study on Structural Design and Optimization Analysis for 2V80 Engine Piston Based on Finite Element Analysis“. Advanced Materials Research 753-755 (August 2013): 1188–91. http://dx.doi.org/10.4028/www.scientific.net/amr.753-755.1188.

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According to the experiment of engine bench test and piston's temperature field, the thermal boundary conditions and the mechanical conditions of piston are obtained. Under the condition of mechanical load and thermal load playing, the stress and strain of original engine is simulated and analyzed. Stress concentration and weak structure of original engine is found. The parameter of piston structure is optimized and the optimizations are put forward and analyzed to verify the optimizations' effectiveness. These provide a reference for the digital modeling and numerical analysis to solver engineering problems.

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Feng, Kai Lin, Yi Peng Chen, Guan Guo Ma und Qiang Li. „Force Analysis on Piston Assembly of Mine Rotor Wet Spraying Machine“. Applied Mechanics and Materials 668-669 (Oktober 2014): 189–92. http://dx.doi.org/10.4028/www.scientific.net/amm.668-669.189.

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The force of the concrete pumping work of mine rotor wet spraying machine is analysis in this paper, focusing on the piston assembly and cylinder bore rotor stress analysis during nesting, selecting the important structural parameters and optimizing the structure, to ensure the normal and efficient function of wet spraying working to improve the stability of wet spray machine work and life, and providing an important reference for the structural design of the piston assembly.

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Zhang, Hong Xin, Yu Qin Jiao, Tie Zhu Zhang und Lian Jun Cheng. „Structural Principle of Hydraulic Engine“. Applied Mechanics and Materials 709 (Dezember 2014): 28–31. http://dx.doi.org/10.4028/www.scientific.net/amm.709.28.

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Hydraulic engines can be widely used in many fields, such as agricultural machinery, construction machinery, duty vehicle, and many other fixing or mobile devices. The development analysis and study on their structural principle, technical and operational characteristics will be undoubtedly very useful for putting forward new type hydraulic engines. The structural principle of Hydraulic Free Piston Engine, Hydraulic Confined Piston Engine was introduced. The structural principle of Half Crank Hydraulic Engine (HCHE), which inherits the merits of traditional engine, HFPE and HCPE, was put forward.

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Zavos, Anastasios, und Pantelis George Nikolakopoulos. „Waviness and straightness of cylinder and textured piston ring tribo pair“. International Journal of Structural Integrity 6, Nr. 2 (13.04.2015): 300–324. http://dx.doi.org/10.1108/ijsi-07-2013-0014.

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Purpose – The purpose of this paper is to review and to provide a dipper understanding of what happens to piston rings and cylinder surfaces when manufacturing errors depicted, such as waviness and straightness. The mechanism of friction and the piston ring structural integrity, due to the surface irregularities, are analyzed either for smooth ring surface or for artificial textured, while piston ring floats into the piston groove or not. Design/methodology/approach – In this work two tribological models of a piston ring- cylinder package are presented using CFD analysis. Initially, the piston ring is considered as a secured ring in the groove of piston (secured ring) while in second model, the piston ring floats into the piston groove (free ring). Findings – Increasing the number of waves across the piston ring thickness, the structural integrity of the ring is strongly influenced. Piston ring with surface texturing reduces the mean friction force, under the consideration of cylinder straightness. The gas leaks due to existence of the ring gap, affects significantly the maximum mechanical stresses. Originality/value – The novelty of this paper is the analysis of manufacturing errors, such as waviness and straightness either for smooth or for artificial textured piston ring. In particular, the piston ring structural integrity investigated while chamber gas pressure leaks through the ring gap or not. The number of the waves, their amplitude and the fluid velocity are also taken into consideration.

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HIGASHIMACHI, Takao, Takahide NAKAYAMA, Takenori HIRAKAWA und Hisato SASAHARA. „Contact Problem Structural Analysis of Universal Gripper for Piston Ring“. Proceedings of the JSME annual meeting 2000.2 (2000): 303–4. http://dx.doi.org/10.1299/jsmemecjo.2000.2.0_303.

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Rastogi, Vinamra Kumar. „Static Structural Analysis of a Forged Aluminum High-Performance Piston“. International Journal of Engineering Trends and Technology 47, Nr. 6 (25.05.2017): 356–60. http://dx.doi.org/10.14445/22315381/ijett-v47p258.

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Srinivas, E. Krishna. „Design and Analysis of Piston Rings by Using Hyper Elastic Materials of Dynamic Engine Assembly“. International Journal for Research in Applied Science and Engineering Technology 9, Nr. VII (20.07.2021): 1808–15. http://dx.doi.org/10.22214/ijraset.2021.36704.

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The piston ring is one of the main components of an internal combustion engine. Its main purposes are to seal the combustion chamber of engine. The main objective of this work is to develop the design modeling and then analysis of stress and deformation of the piston rings by using different materials like Grey cast iron, elastomer and Titanium alloy by using ansys software and to investigate these three materials behavior which are used for the piston ring. The project shows the components involved in the single cylinder engine assembly and their operation. Finally we are checking out three materials behaviors which are used for piston rings. This research paper deals with to reduce the friction of a piston ring while maintaining a Large oil film load-carrying capacity, an approach comprising of the inverse method, modeling and analysis of piston rings using Structural and rigid dynamics is deliberated in order to quantify the stress that the rings can bear. Many researchers had considered that the entire surface of the ring was enveloped in an oil film, but much experimental research has discovered that not all the entire surface was soaked. The various parameters studied under structural analysis are displacement and ultimate stress limit using three Different composition materials. A cumulative analysis is performed which considers the combined effect of mechanical and load for determination of the dimensions of the rings.

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Zhang, Junhui, Bing Xu und Bin Zhang. „58812 ANALYSIS OF THE PISTON/CYLINDER PAIR OF AXIAL PISTON PUMP BASED ON VIRTUAL PROTOTYPE(Fluid-Structure Interaction in MBS)“. Proceedings of the Asian Conference on Multibody Dynamics 2010.5 (2010): _58812–1_—_58812–9_. http://dx.doi.org/10.1299/jsmeacmd.2010.5._58812-1_.

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Guan, Dong, Li Jing, Harry H. Hilton und Junjie Gong. „Dynamic lubrication analysis for a spherical pump“. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 233, Nr. 1 (28.02.2018): 18–29. http://dx.doi.org/10.1177/1350650118762603.

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Dynamic lubrication analyses for a spherical pump, consisting of a piston and cylinder, are presented. Contact forces between piston and cylinder are modeled first using an equivalent ball-on-plane model. Both the effects of external loads and operating conditions are considered in a dynamic elastohydrodynamic lubrication model, which is derived from Reynolds equation. Two assumed time-dependent sine-wave and square-wave loads are applied to the model. Fluid film thicknesses are estimated using the model and assumed loads, effects of different structural, and operational parameters, such as piston diameter, radial clearance, applied load, piston speed, lubricant viscosity, and surface roughness, on fluid film thickness are investigated. Fluid film thickness reactions of more realistic smooth and continuous sine wave loads are compared to discontinuous ones in order to verify whether or not assumed ideal loads are acceptable and reliable. Results indicate that piston diameter, speed, lubricant viscosity have positive relations on the dynamic lubrication performance, and increasing these values can improve the dynamic lubrication regime. While the parameters such as radial clearance, applied load, and surface roughness have the verse effects. Furthermore, the impacts of all the above parameters on fluid film are different either. These obtained results can be used to effectively optimize spherical pump lubrication performance.

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Faisal, M. H., und S. Prabagaran. „Micro structural and static structural analysis of LM6/B4C and LM6/B4C/GR hybrid aluminium metal matrix composites“. International Journal of Engineering & Technology 7, Nr. 1.1 (21.12.2017): 37. http://dx.doi.org/10.14419/ijet.v7i1.1.8919.

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This research work was performed to interpret the fabrication and mechanical characteristics of LM6/B4C and LM6/B4C/Gr aluminium matrix composites. The aluminium matrix composites were manufactured by reinforcing B4C particles with varying wt % of 3, 5, 7 using stir casting technique. LM6/B4C 7% composite was made hybrid by adding 2% Graphite into it. The presence of graphite in such composites provide the self-lubricating effect, replacing conventional sliding contacts (bearings, sheaves, pistons, pulleys) with them. This also helps to reduce the lubricating oil and fuel consumption along with environmental benefits reducing energy wastage in industrial and automotive components. The properties of the composites were collated with the base alloy to analyse the enhancement in mechanical characteristics that had been transmitted by the reinforcement particles to the composites. The specimen microstructure was inspected using an optical microscope to ensure the uniform distribution of reinforcement particles in the matrix. The piston was modelled in CREO and using ANSYS 14.5 workbench static structural analysis of LM6 alloy, LM6/B4C composite and LM6/B4C/Gr hybrid aluminium composites are executed. Compared to LM6 alloy, better static structural properties were obtained in composites and hybrid composite.

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Heitzman, R. C. „Design of an Articulated Piston for Caterpillar® 3500 Engines Utilizing Computer-Aided Design and Analysis“. Journal of Engineering for Gas Turbines and Power 112, Nr. 3 (01.07.1990): 276–79. http://dx.doi.org/10.1115/1.2906492.

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The purpose of this paper is to describe the concept, design, and analysis of a two-piece articulated piston for the Caterpillar 3500 diesel engine. Utilization of computer design and analysis enabled the piston to be optimized for structural capability, weight, and performance. Extensive analysis was performed on the steel upper structure. Models generated in two and three dimensions evaluated mechanical, thermal, and combined load cases. The result of this design and analysis is a piston that meets the engine’s objectives and provides additional value to the engine product.

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Nie, Song-lin, De-kui Xin, Hui Ji und Fang-long Yin. „Optimization and performance analysis of magnetorheological fluid damper considering different piston configurations“. Journal of Intelligent Material Systems and Structures 30, Nr. 5 (13.02.2019): 764–77. http://dx.doi.org/10.1177/1045389x19828526.

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This article presents the design and multi-physics coupling analysis of a shear-valve-mode magnetorheological fluid damper with different piston configurations. The finite element model is built to study the effects of the shape of the piston slot and magnetism-insulators at both ends of the piston yoke on the performance of the magnetorheological damper. Particle swarm optimization and finite element simulation are combined to optimize the structural parameters of the magnetorheological damper. The influences of different piston configurations on the magnetic flux density in the working gap, the shear stress, the viscous stress, and the dynamic range are investigated. The simulation results reveal that the magnetorheological damper, in which the corners of the piston slot are chamfered and the edges of the magnetism-insulators are filleted, exhibits a better damping performance. Furthermore, magnetorheological dampers with and without magnetism-insulators are fabricated. The influences of control current, displacement, and velocity on the mechanical performance of the magnetorheological dampers are experimentally investigated, and the experiment results are in accordance with the theoretical derivation and finite element simulation results.

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Kumar, Chandan, und Nilamber Kumar Singh. „Structural and Thermal Analysis of an I.C. Engine Piston using ANSYS“. Advanced Science, Engineering and Medicine 10, Nr. 3 (01.03.2018): 369–73. http://dx.doi.org/10.1166/asem.2018.2140.

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Wu, Xiaofeng, Chihkeng Chen, Chihwei Hong und Yafeng He. „Flow ripple analysis and structural parametric design of a piston pump“. Journal of Mechanical Science and Technology 31, Nr. 9 (September 2017): 4245–54. http://dx.doi.org/10.1007/s12206-017-0823-8.

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Guan, Dong, Harry H. Hilton, Zhengwei Yang, Li Jing und Kuan Lu. „Lubrication regime analysis for spherical pump“. Industrial Lubrication and Tribology 70, Nr. 8 (12.11.2018): 1437–46. http://dx.doi.org/10.1108/ilt-07-2017-0207.

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Purpose This paper aims to investigate the lubrication regime in spherical pump, especially under different structural parameters and operational conditions. Design/methodology/approach A ball-on-plane configuration is adopted to represent the contact model between spherical piston and cylinder cover. The governing equations, which include the Reynolds and elasticity equations, are solved and validated by Jin–Dowson model. Both minimum film thickness and lambda ratio (ratio of minimum fluid film thickness to combined surface roughness of the piston and cylinder cover) of the equivalent model are obtained using an established model. Findings The results indicate that piston diameter and radial clearance are the two main factors affecting the pump lubrication regime. Other related parameters such as rotation speed of the piston, load, viscosity of working medium, material matching and surface roughness of piston and cylinder cover also have different impacts on the lubrication regime of the spherical pump. Originality/value These results emphasize the importance of the design and manufacturing parameters on the tribological performance of spherical pumps and these are also helpful in improving the spherical pump lubrication regime and enlarging its life cycle. This is to certify that to the best of the authors’ knowledge, the content of this manuscript is their own work. This manuscript has only been submitted to this journal and never been published elsewhere. The authors certify that the intellectual content of this manuscript is the product of their own work and that all the assistance received in preparing this manuscript and sources has been acknowledged.

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Yang, Lijie, Shuai Yin und Qingna Niu. „Water hydraulic axial piston motor cavitation characteristics based on CFD technology“. World Journal of Engineering 14, Nr. 3 (12.06.2017): 231–36. http://dx.doi.org/10.1108/wje-11-2016-0144.

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Purpose The purpose of this paper is to analyze the cavitation characteristics of a water hydraulic axial piston motor (WHAPM) to improve the water motor performance, to reduce the vibration and noise and to prolong the service life of the motor. Design/methodology/approach The computational fluid dynamics (CFD) software PumpLinx is chosen to do cavitation analysis of the WHAPM. In this case, first, cavitation mechanism of the water piston motor is analyzed in depth. Then, considering the effects of bubble dynamics, the rate of phase transition, turbulence effects and non-condensable gas, the full cavitation model is selected, the dynamic CFD numerical model of internal flow field on the water hydraulic piston motor is established based on PumpLinx software and the fluid cavitation inside is numerically studied. Finally, the influence of the valve plate and pistons on motor cavitation is analyzed. Findings Research results show that there are two serious cavitation regions: one is the pressure transition region of the valve plate that is near the top dead center, and the other is the low-pressure region of the piston that is near the low-pressure transition area. Moreover, the more serious cavitation area is on the valve plate region. Originality/value The simulation results show that the proposed algorithm is able to detect the cavitation characteristics of the water piston motor. Besides, it is deduced that valve-plate structure optimization is more important than pistons to reduce cavitation influence.

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Lu, Yanjun, Sha Li, Peng Wang, Cheng Liu, Yongfang Zhang und Norbert Müller. „The Analysis of Secondary Motion and Lubrication Performance of Piston considering the Piston Skirt Profile“. Shock and Vibration 2018 (2018): 1–27. http://dx.doi.org/10.1155/2018/3240469.

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The work performance of piston-cylinder liner system is affected by the lubrication condition and the secondary motion of the piston. Therefore, more and more attention has been paid to the secondary motion and lubrication of the piston. In this paper, the Jakobson-Floberg-Olsson (JFO) boundary condition is employed to describe the rupture and reformation of oil film. The average Reynolds equation of skirt lubrication is solved by the finite difference method (FDM). The secondary motion of piston-connecting rod system is modeled; the trajectory of the piston is calculated by the Runge-Kutta method. By considering the inertia of the connecting rod, the influence of the longitudinal and horizontal profiles of piston skirt, the offset of the piston pin, and the thermal deformation on the secondary motion and lubrication performance is investigated. The parabolic longitudinal profile, the smaller top radial reduction and ellipticities of the middle-convex piston, and the bigger bottom radial reduction and ellipticities can effectively reduce the secondary displacement and velocity, the skirt thrust, friction, and the friction power loss. The results show that the connecting rod inertia, piston skirt profile, and thermal deformation have important influence on secondary motion and lubrication performance of the piston.

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Mazouzi, Ridha, Ahmed Kellaci und Abdelkader Karas. „Effects of piston design parameters on skirt-liner dynamic behavior“. Industrial Lubrication and Tribology 68, Nr. 2 (14.03.2016): 250–58. http://dx.doi.org/10.1108/ilt-07-2015-0103.

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Purpose – This paper aims to study the effect of piston skirt design parameters on the dynamic characteristics of a piston–cylinder contact. Design/methodology/pproach – This paper focuses on an analysis of the piston dynamic response. The oil-film pressure and the structural deformation were approximated, respectively, by finite difference method and finite element method. Findings – The results show that the design parameters such as clearance, offset and the axial location of piston pin have a great influence on the dynamics of the piston and hence on the piston slap phenomenon and the frictional power loss. Originality/value – All the results mainly focus on the slap noise of the engine and can be used in the piston–liner development at the development of the engine.

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Liu, Wei, An Lin Wang, Xue Wen Shan, Xiao Lu Zhang und Tao Jiang. „Valve Plate for Piston Pump Cavitation Problem with the Damp Groove Structural Optimization“. Applied Mechanics and Materials 543-547 (März 2014): 154–57. http://dx.doi.org/10.4028/www.scientific.net/amm.543-547.154.

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To reduce the cavitation occurring on valve plate of typical Swashplate piston pump, an optimization design method was introduced to quantitively analyse the accurate relationship between structural jet grooves parameters and cavitation.Using the CFD method, the sunking and discharging process in piston pump was simulated dynamically.The damp grooves structure effect on both jet angle and pressure shock were analysed visually with a series of different parametrical grooves.By establishing parametrical damp groove model, the piston pumps dynamic analysis was integrated with the technologies of CFD analysis, experimental design and approximation model, etc.The mathematical model of plunger pressure in oil back period, jet angle and structural parameters of damp groove were established in the form of second-order RSM model. The damp groove structure of valve plate was optimized on the basis of the RSM model.Test data show that the anti-cavitation performance of optimized valve plate was increased obviouslyAnd this method provided theoretical foundation for the structure design of damp groove.

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Ganapathy Pandian, Sakthinathan, Srivathsan Puzhuthivakkam Rengarajan, Terrin P. Babu, Vignesh Natarajan und Harikrishnan Kanagasabesan. „Thermal and Structural Analysis of Functionally Graded NiCrAlY/YSZ/Al2O3 Coated Piston“. SAE International Journal of Materials and Manufacturing 8, Nr. 2 (01.05.2015): 578–85. http://dx.doi.org/10.4271/2015-01-9081.

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34

Frătița, M., F. Popescu, K. Uzuneanu, I. V. Ion und C. M. Angheluță. „About Structural and Thermal Analysis of Diesel Engine Piston Using Ansys Software“. IOP Conference Series: Materials Science and Engineering 595 (20.09.2019): 012041. http://dx.doi.org/10.1088/1757-899x/595/1/012041.

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35

Perera, M. S. M., S. Theodossiades und H. Rahnejat. „A multi-physics multi-scale approach in engine design analysis“. Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics 221, Nr. 3 (01.09.2007): 335–48. http://dx.doi.org/10.1243/14644193jmbd78.

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Vibration behaviour of an internal combustion engine depends on rigid body inertial dynamics, structural modal characteristics of its elastic members, tribological behaviour of loadbearing contacts, and piston-cylinder interactions. Therefore, it is essential to use a multi-physics approach that addresses all these physical properties in a single integrative model as presented in this paper. This approach can be regarded as holistic and a good aid for detailed design. Particular attention is paid to the critical elements in the system, such as load-bearing conjunctions (crankshaft main bearings) and piston-cylinder wall interactions. Another important feature is the integrated analysis across the physics of motion from microscale fluid film formation to submillimetre structural deformations and onto large displacements of inertial members. In order to succeed in predictions within sensible industrial time scales, analytical methods have been used as far as possible rather than numerical approaches. Model predictions show good agreement with fired engine test data.

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Cihan, Ö., und M. Bulut. „A Comparative Fatigue Analysis of GFRP, CFRP and Structural Steel for Connecting Rod Using ANSYS“. International Polymer Processing 36, Nr. 2 (01.05.2021): 144–55. http://dx.doi.org/10.1515/ipp-2020-3992.

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Abstract The connecting rod, as an important part in internal combustion engines, has been most widely used in automotive industry, and its main function is to transfer the reciprocating motion of the piston into the rotatory motion of the crankshaft. In this study, fatigue analysis of the connecting rod is performed numerically for different engine speeds. With this aim, it is attempted to reduce the weight of the connecting rod by choosing the low density and high strength of GFRP and CFRP composite materials instead of structural steel. In this way, it is possible to improve the engine efficiency with saving unnecessary balancing weights as well as reducing the cost of the connecting rod. In the current study, the connecting rod was modeled using Solidworks software, and its CAD model was transferred to the ANSYS/Workbench software for Finite Element Analyses (FEA). In FEA, fatigue analyses were performed to determine fatigue parameters such as alternating stress, deformation, fatigue life and safety factor according to Soderberg’s fatigue model. Results from this study showed that alternating stress and safety factor reached a critical value between piston pin end and crank end near to the piston pin end. Alternating stress values of the GFRP and CFRP connecting rods were much lower than those of structural steel rod. In contrast to reduction of the weight by 1/5, fatigue life of the connecting rod with structural steel material was much greater than those of GFRP and CFRP providing a higher safety factor compared with composite materials.

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Chen, Jin Zhou, Cun Yun Pan, Wen Min Li, Lei Zhang und Hu Chen. „The Study of Friction Power Loss of Piston Group of a Twin-Rotor Engine“. Applied Mechanics and Materials 620 (August 2014): 375–81. http://dx.doi.org/10.4028/www.scientific.net/amm.620.375.

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Compared with the conventional piston engines, the new rotary engine has many significant advantages, such as smaller volume and higher power density. Current studies at home and abroad are mainly focusing on aspects of its structural design, kinematics, dynamics analysis, except mechanical efficiency. In conventional piston engines, frictional loss of the piston group accounted for 65% of the total friction power loss[1]. In order to provide the scientific basis for designing low friction piston of the rotary engine, this paper combine the average two-dimensional Reynolds equation, the asperity contacts equation, viscosity-temperature equation and loads balance equation, proposing a method for calculating the friction power loss, and the applying the method to calculate the friction power loss of piston group of a new rotary engine.

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Yang, Lijie, Guimei Wang und Songlin Nie. „Speed characteristics analysis and simulation of the water hydraulic axial piston motor“. World Journal of Engineering 13, Nr. 6 (05.12.2016): 524–28. http://dx.doi.org/10.1108/wje-09-2016-0086.

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Purpose The purpose of this study is to analyze the speed characteristics of the water hydraulic axial piston motor. The speed performance of water hydraulic piston motor which uses water as medium is different from that mineral oil one. Design/methodology/approach To analyze the speed characteristics of the water hydraulic motor, the speed model of a swash plate water hydraulic piston motor is developed theoretically and a simulation model with AMESim is built. Findings The effects of clearance between friction pairs and input pressure on the speed are analyzed and compared between the theoretical and numerical models. Originality/value The results of the theoretical and simulation models both verify that the clearance of friction pairs is the key factor in the hydraulic piston motor’s speed.

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Zhang, Bao Cheng, Tong Li, Hai Fei Zhan und Yuan Tong Gu. „Impact of the Piston Secondary Motion on its Slap Force“. Applied Mechanics and Materials 553 (Mai 2014): 582–87. http://dx.doi.org/10.4028/www.scientific.net/amm.553.582.

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A theoretical model is developed for the analysis of piston secondary motion. Based on this model, the slap force of a specific L6 diesel engine was compared when considering different boundary conditions, such as lubricating oil on cylinder liner, surface roughness, deformation of cylinder liner and piston skirt. It is concluded that it is necessary to consider the secondary motion of piston in the analysis of the inner excitation for an internal combustion engine. A more comprehensive consideration of the boundary condition (i.e., more close to the actual condition) will lead to a smaller maximum slap force, and among all boundary conditions considered in this paper, the structural deformation of the piston skirt and cylinder liner is the most influential factor. The theoretical model developed and findings obtained in this study will benefit the future analysis and design of advanced internal combustion engine structures.

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Kim, Jeong-Hwa, und Mi-Jung Shin. „A Study on the Analysis of Structural Behaviors the Swash-Type Piston Pump“. Journal of the Korean Society of Industry Convergence 19, Nr. 3 (30.09.2016): 125–32. http://dx.doi.org/10.21289/ksic.2016.19.3.125.

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41

Zhang, Hongning, Zhichuan Guan, Yuqiang Xu, Yongwang Liu und Yang Zhao. „Failure Analysis and Structural Optimization of Piston Check Valve in Pulsed-Jet Generator“. Journal of Computational and Theoretical Nanoscience 13, Nr. 1 (01.01.2016): 520–27. http://dx.doi.org/10.1166/jctn.2016.4835.

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42

Chen, Hu, Cun-yun Pan, Hai-jun Xu, Hao Deng und Chen Han. „Analysis on structural characteristics of rotors in twin-rotor cylinder-embedded piston engine“. Journal of Central South University 21, Nr. 6 (Juni 2014): 2240–52. http://dx.doi.org/10.1007/s11771-014-2175-1.

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Chen, Hu, Cun Yun Pan, Xiao Jun Xu, Xiang Zhang und Hai Jun Xu. „Modeling and Analysis on Mean Effective Torque of Rotors in Twin-Rotor Cylinder-Embedded Piston Engine“. Advanced Materials Research 1016 (August 2014): 630–34. http://dx.doi.org/10.4028/www.scientific.net/amr.1016.630.

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Torque, as an important indicator of the engine, is the reflection of performance of cylinder-embedded piston engine. In power stroke, torque varies at different moments, so if the impact of structural parameters on torque needs to be analyzed, the values of torque in power stroke need to be added together and divide lasting time. The average effective torque is the average of the torque generated by explosive force during the entire power stroke, which overcomes the disadvantages of the instantaneous torque which can not reflect the changes in power process. Therefore, the influence of each structure size on the force transmission performance can be analyzed with maximizing the average effective torque. It is concluded that for increasing the average effective torque, the radius of the hinge center trajectory of cap R should be increased, and the length from rotating center O to the trajectory of piston H should be decreased. The length of rod L has little influence on the average effective torque. However, if there is a too large D-value between R and H, the rod may deflect seriously, so that the piston side force increases, causing the piston wear and tear. So the values of R and H should be selected with specified conditions in the design.

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Lin, Ji Jing, und Yan Hong Chen. „The Finite Element Analysis and Optimization of Micro Free Piston Swing Engine’s Strain Interference“. Advanced Materials Research 139-141 (Oktober 2010): 938–42. http://dx.doi.org/10.4028/www.scientific.net/amr.139-141.938.

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MFPSE, Micro Free Piston Swing Engine, is a new type of miniature internal combustion engine based on the working principle of two-stroke swing engine. The successful development and operation of this type of miniature internal combustion engine provide important significance for the miniaturization of the internal combustion engine, and provide a number of important research theory, computation method and experimental data. In this article, according to the work characteristics and co-ordination requirements of MFPSE (Micro Free Piston Swing Engine), whose strain interference is analyzed using finite element analysis software, the problems and interference of the center pendulum and cylinder is found evidently. The data of analysis provides theory basis for the MFPSE’s structural optimization, and is critical to improve the performance of MFPSE.

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Zhao, Wei Tao, Tian Jun Yu und Xiao Dong Yang. „Flutter Analysis of Viscoelastic Panels in Supersonic Flow“. Advanced Materials Research 710 (Juni 2013): 256–59. http://dx.doi.org/10.4028/www.scientific.net/amr.710.256.

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In this paper, dynamic instability behavior of a linear viscoelastic panel in supersonic flow is investigated. The quasi-steady piston theory of supersonic flow is employed for the aerodynamic pressure. The partial differential governing equation of isotropic flat panel is derived by introducing viscoelastic structural damping based on Kelvins model. The panel governing equation is transformed into a set of ordinary differential equations via the Galerkin approach. First-order state equations are afterwards obtained and solved by means of a standard eigenvalue calculation. The dynamic instability of viscoelstic panels is predicted by the feature of characteristic roots. The phenomena of coupled-mode flutter without structural damping and single-mode flutter with structural damping induced by the supersonic flow are observed for the different dynamic pressure values. Results indicate that structural damping plays an important role for the stability of panels flutter. Flutter threshold keeps decreasing as viscoelastic structural damping is increased.

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Liu, Yu C., Mayra A. Machuca, Simone A. Beckham, Menachem J. Gunzburg und Anna Roujeinikova. „Structural basis for amino-acid recognition and transmembrane signalling by tandem Per–Arnt–Sim (tandem PAS) chemoreceptor sensory domains“. Acta Crystallographica Section D Biological Crystallography 71, Nr. 10 (30.09.2015): 2127–36. http://dx.doi.org/10.1107/s139900471501384x.

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Chemotaxis, mediated by methyl-accepting chemotaxis protein (MCP) receptors, plays an important role in the ecology of bacterial populations. This paper presents the first crystallographic analysis of the structure and ligand-induced conformational changes of the periplasmic tandem Per-Arnt-Sim (PAS) sensing domain (PTPSD) of a characterized MCP chemoreceptor. Analysis of the complex of theCampylobacter jejuniTlp3 PTPSD with isoleucine (a chemoattractant) revealed that the PTPSD is a dimer in the crystal. The two ligand-binding sites are located in the membrane-distal PAS domains on the faces opposite to the dimer interface. Mutagenesis experiments show that the five strongly conserved residues that stabilize the main-chain moiety of isoleucine are essential for binding, suggesting that the mechanism by which this family of chemoreceptors recognizes amino acids is highly conserved. Although the fold and mode of ligand binding of the PTPSD are different from the aspartic acid receptor Tar, the structural analysis suggests that the PTPSDs of amino-acid chemoreceptors are also likely to signal by a piston displacement mechanism. The PTPSD fluctuates between piston (C-terminal helix) `up' and piston `down' states. Binding of an attractant to the distal PAS domain locks it in the closed form, weakening its association with the proximal domain and resulting in the transition of the latter into an open form, concomitant with a downward (towards the membrane) 4 Å piston displacement of the C-terminal helix.In vivo, this movement would generate a transmembrane signal by driving a downward displacement of the transmembrane helix 2 towards the cytoplasm.

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Dong, Chao, und Wei Gang Zheng. „The Improved Structure of Swash Plate Axial Piston Pump“. Applied Mechanics and Materials 496-500 (Januar 2014): 733–35. http://dx.doi.org/10.4028/www.scientific.net/amm.496-500.733.

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in order to change China's shipbuilding capacity continues to rise, while the ship equipment localization rate decreased and the situation of reality , the national defense science and Industry Committee put forward the strategic planning of shipbuilding, coordinated development. Marine auxiliary is the largest number, the most species of ship equipment. Based on the analysis of structural weaknesses of the previous ship swash plate axial piston pump, designed a kind of improved fixed swash plate axial piston pump

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Luo, Sheng Mei, Wei Liu, Fu Fang Luo, Wei Wei Yu und Zhi Hong Ma. „Kinematics Analysis of the New Type of Offset Radial Piston Motor“. Advanced Materials Research 889-890 (Februar 2014): 463–66. http://dx.doi.org/10.4028/www.scientific.net/amr.889-890.463.

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This paper introduces the structural principle of a new offset radial type motor. Through analyzing the kinematic characteristics of the motor piston theory, the result shows that the motor has characteristics of good startup performance at low speed, good sliding performance with sliding boots, smooth operation, low noise and so on, so the performance is superior to the general motor of low speed and high torque. Besides, comparing with other types of hydraulic motor, its lifetime increases and it is also easier to produce and repair. Moreover, beside the use of common hydraulic system, it can also be used in pure water hydraulic system under certain conditions.

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Hartsock, D. L. „Partially Stabilized Zirconia Piston Bowl Reliability“. Journal of Engineering for Gas Turbines and Power 109, Nr. 4 (01.10.1987): 367–73. http://dx.doi.org/10.1115/1.3240050.

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The Weibull based “Simplified Structural Ceramic Design Technique” [1] was used to calculate the reliability of a partially stabilized zirconia (PSZ) piston bowl design. The details of the method and a set of sample calculations are presented. Test results of the piston bowl showed cracks in regions which had a high calculated probability of failure. In addition cracks developed in a region of high compressive/shear stress. Since Weibull reliability analysis only uses tensile stresses this area did not have a high calculated probability of failure. Several hypotheses are presented for the mode of failure in this region. The simplified technique was used to predict what the necessary material properties would have to be for successful PSZ insert of the design shown.

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Pham, Minh-Ngoc, Chang-Jo Yang, Jun-Ho Kim und Bu-Gi Kim. „Transient Structural Analysis of Piston and Connecting Rods of Reciprocating Air Compressor Using FEM“. Journal of the Korean Society of Marine Environment and Safety 23, Nr. 4 (31.08.2017): 393–99. http://dx.doi.org/10.7837/kosomes.2017.23.4.393.

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