scholarly journals Frost Heave Deformation Analysis Model for Microheave Filler

2020 ◽  
Author(s):  
Ye Yangsheng ◽  
Du Xiaoyan ◽  
Zhang Qianli ◽  
Chai Jinfei
Keyword(s):  
Frost Heave ◽  
Deformation Analysis ◽  
Analysis Model

Space Optical Remote Sensor of the CAE Thermal Control Index Calculation Method

2011 ◽  
Vol 308-310 ◽  
pp. 2328-2333
Author(s):  
Li Fu Li
Keyword(s):  
Optical System ◽  
Thermal Loading ◽  
Surface Deformation ◽  
Thermal Control ◽  
Temperature Fields ◽  
Deformation Analysis ◽  
Analysis Model ◽  
Zernike Polynomial ◽  
Remote Sensors ◽  
Remote Sensor

The thermal control indicators CAE methods of Space optical remote sensor are analyzed in the presented work. We sat up a thermal optical analysis model for space optical remote sensor. By assuming fully covered by in-orbit temperature load, and using the finite element method for thermal deformation analysis, we obtained the optical remote sensor surface deformation and displacement under various thermal loading. Using ZERNIKE polynomial, wave was fitted to obtain ZERNIKE polynomial coefficients which were incorporated into the optical system design. Using CODE V optical calculation software, heat-ray machines under elastic deformation of the system point spread function, transfer function (MTF), wave front differential (WFE) etc. were calculated. Image quality changes of remote sensors are discussed in variety assumed cases such as temperature loads of quality change. By repeated iteration, critical value of temperature fields meeting the design requirements are obtained for the optical system. Optical indicators were converged to the temperature field indicator, then reasonable indicators of thermal control for remote sensors were obtained. For the thermal control design, this method provided a reliable basis for design.

An improved disk discontinuous deformation analysis model for simulating particle mixing process in rotary drums

2020 ◽  
Vol 368 ◽  
pp. 202-212 ◽  
Author(s):  
Gang-Hai Huang ◽  
Xiao-Feng Chen ◽  
Xiong-Wei Yi ◽  
Yuan-Zhen Xu ◽  
Shu Zhang ◽  
...  
Keyword(s):  
Discontinuous Deformation Analysis ◽  
Deformation Analysis ◽  
Mixing Process ◽  
Analysis Model ◽  
Particle Mixing ◽  
Discontinuous Deformation

scholarly journals Development and Performance Analysis of Pneumatic Soft-Bodied Bionic Basic Execution Unit

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Yu Zhang ◽  
Wenchuan Zhao ◽  
Ning Wang ◽  
Dengyu Lu
Keyword(s):  
Physical Model ◽  
Dynamic Characteristics ◽  
Structural Characteristics ◽  
Research Process ◽  
Leaf Spring ◽  
Deformation Analysis ◽  
Maximum Output ◽  
Analysis Model ◽  
Empirical Formulas ◽  
Execution Unit

This paper studies the design of pneumatic soft-bodied bionic basic execution unit with soft-rigid combination, which can be used as an actuator for pneumatic soft-bodied robots and soft-bodied manipulators. This study is inspired by structural characteristics and motion mechanism of biological muscles, combined with the nonlinear hyperelasticity of silica gel and the insertion of thin leaf spring structure in the nonretractable layer. Response surface analysis and numerical simulation algorithm are used to determine the optimal combination of structural dimension parameters by taking the maximum output bending angle of the basic executing unit as the optimization objective. Based on Odgen’s third-order constitutive model, the deformation analysis model of the basic execution unit is established. The physical model of pneumatic soft-bodied bionic basic execution unit is prepared through 3D printing, shape deposition, soft lithography, and other processing methods. Finally, the motion and dynamic characteristics of the physical model are tested through experiments and result analysis, thus obtaining curves and empirical formulas describing the motion and dynamic characteristics of the basic execution unit. The relevant errors are compared with the deformation analysis model of the execution unit to verify the feasibility and effectiveness of the design of the pneumatic soft-bodied bionic basic execution unit. The above research methods, research process, and results can provide a reference for the research and implementation of pneumatic and hydraulic driven soft-bodied robots and grasping actuators of soft-bodied manipulators.

Analysis of High-Speed Railway Roadbed Settlement in Seasonally Frozen Regions

2012 ◽  
Vol 204-208 ◽  
pp. 1740-1743 ◽  
Author(s):  
Gang Qiang Shi ◽  
Yu Zhi Zhang ◽  
Shi Yun Zhao ◽  
Lu Xin Zhang ◽  
Bao Chen Sun
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
High Speed ◽  
Deformation Analysis ◽  
Analysis Model ◽  
Element Analysis ◽  
High Speed Railway ◽  
Finite Element Analysis Model ◽  
Seasonally Frozen Regions ◽  
Passenger Dedicated Line

Relying on the roadbed in seasonally frozen region of Harbin-Dalian passenger dedicated line，a finite element analysis model was built to study the changing rules of roadbed settlement in construction and operation. The analog and actual results were in good consistence, the model is suitable for the roadbed deformation analysis of high-speed railway in seasonally frozen regions.

Compressive Residual Stresses Effect on Fatigue Life of Rolling Bearings

2007 ◽  
Author(s):  
Spiridon S. Cretu ◽  
Marcelin I. Benchea ◽  
Ovidiu S. Cretu
Keyword(s):  
Fatigue Life ◽  
Residual Stresses ◽  
Equivalent Stress ◽  
Rolling Contact ◽  
Deformation Analysis ◽  
Ball Bearings ◽  
Analysis Model ◽  
Loading Cycle ◽  
Von Mises ◽  
Compressive Residual Stresses

The fatigue life tests carried out on two groups of ball bearings confirm the positive influence of the compressive residual stresses induced by a previous loading in the elastic-plastic domain. The values of residual stresses are numerically evaluated by employing a three-dimensional strain deformation analysis model. The model is developed in the frame of the incremental theory of plasticity by using the von Mises yield criterion and Prandtl-Reuss equations. To consider the material behaviour the Ramberg-Osgood stress-strain equation is involved and a nonlinear equation is considered to model the influence of the retained austenite. To attain the final load of each loading cycle the two bodies are brought into contact incrementally, so that for each new load increment the new pressure distribution is obtained as the solution of a constrained system of equation. Conjugate gradients method in conjunction with discrete convolution fast Fourier transform is used to solve the huge system of equations. Both the new contact geometry and residual stresses distributions, are further considered as initial values for the next loading cycle, the incremental technique being reiterated. The cyclic evaluation process of both plastic strains and residual stresses is performed until the material shakedowns. Comparisons of the computed residual stresses and deformed profiles with corresponding measured values reveal a good agreement and validate the analysis model. The von Mises equivalent stress, able to include both elastic and residual stresses, is considered in Ioannides-Harris rolling contact fatigue model to obtain theoretical lives of the ball bearings groups. The theoretical analysis reveals also greater fatigue lives for the ball bearings groups with induced residual stresses than the fatigue lives of the group without induced residual stresses.

An Efficient Disk-Based Discontinuous Deformation Analysis Model for Simulating Large-Scale Problems

2020 ◽  
Vol 20 (7) ◽  
pp. 04020103 ◽  
Author(s):  
Gang-Hai Huang ◽  
Yuan-Zhen Xu ◽  
Xiong-Wei Yi ◽  
Ming Xia
Keyword(s):  
Large Scale ◽  
Discontinuous Deformation Analysis ◽  
Deformation Analysis ◽  
Analysis Model ◽  
Large Scale Problems ◽  
Discontinuous Deformation

Development of thermal deformation analysis model of multitasking machine tool with turrets considering bed

2018 ◽  
Vol 2018.31 (0) ◽  
pp. 192
Author(s):  
Masaru ABE ◽  
Jiro SAKAMOTO ◽  
Kenichi NAKANISHI
Keyword(s):  
Machine Tool ◽  
Thermal Deformation ◽  
Deformation Analysis ◽  
Analysis Model

Analysis of Temperature Field and Thermal Deformation for Lubricating Oil Transfer Pump

2012 ◽  
Vol 268-270 ◽  
pp. 1067-1070
Author(s):  
Jian Ning Xu ◽  
Wen Jie Lv ◽  
Bin Zhu ◽  
Duan Yin Zhu ◽  
Yan Xiong Gao
Keyword(s):  
Temperature Field ◽  
Thermal Deformation ◽  
Friction Pair ◽  
Lubricating Oil ◽  
Deformation Analysis ◽  
Analysis Model ◽  
Element Analysis ◽  
Screw Pump ◽  
Pump System ◽  
Twin Screw

Lubricating oil transfer pump is an important function subsystem in twin-screw pump system. The friction pair between Lubrication screw and shell also is heat source of the system, not only affect the temperature field of the subsystem and the whole system, and the excessive thermal deformation itself may exist can also cause drive failure. This paper established the temperature field and thermal deformation analysis model and boundary conditions of the lubrication screw by means of Finite Element Analysis, and analyzed temperature field and thermal deformation of the lubrication screw and shell as the coefficient of convective heat transfer is 1200W/m2∙°C in the oil production process, and proved thermal deformation of the lubrication screw and shell can not affect the normal work of Lubricating oil transfer pump in the condition.

Micro-Structural Model of Magneto-Rheological Composites With Magnetically Induced Stress for Harmonic Shear Deformation

2014 ◽  
Author(s):  
Yotsugi Shibuya ◽  
Hiroshi Nasuno ◽  
Katsuaki Sunakoda
Keyword(s):  
Magnetic Field ◽  
Applied Magnetic Field ◽  
Magnetic Particles ◽  
Structural Model ◽  
Large Strain ◽  
Deformation Analysis ◽  
Damping Capacity ◽  
Analysis Model ◽  
Induced Stress ◽  
Magneto Rheological

Magneto-rheological composites with magnetic particles are prepared. The magnetic particle is Fe-Si-B-Cr system and the average diameter is 10μm. Matrix of the composite is silicon gel. We characterized dynamic response of the material by shear test in magnetic field where intensities are 0 mT, 105 mT and 211 mT. The stiffness and damping capacity of the composite increase with increasing of the magnetic field. To understand mechanism of behavior of magneto-rheological composites, we make a model of the composite with periodical micro structure. The magneto-rheological composite undergoes magnetically induced internal stress field by applied magnetic field. The analysis model involved effect of the applied magnetic field as initial stress in the material. Particles and the magnetically induced stress make locally large strain field in the gel material. A large deformation analysis with the Ogden model using finite element method is made to demonstrate behavior of magneto-rheological composites. The simulation results are compared with experiment results and verified the effectiveness of the model.

scholarly journals Development and Performance Analysis of Pneumatic Soft-Bodied Bionic Actuator

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Wenchuan Zhao ◽  
Yu Zhang ◽  
Ning Wang
Keyword(s):  
Numerical Simulation ◽  
Silica Gel ◽  
Dynamic Characteristics ◽  
Design Method ◽  
Structural Characteristics ◽  
Simulation Method ◽  
Structure Design ◽  
Deformation Analysis ◽  
Analysis Model ◽  
Nonlinear Hyperelasticity

The design of a pneumatic soft-bodied bionic actuator derives from the structural characteristics and motion mechanism of biological muscles, combined with the nonlinear hyperelasticity of silica gel, which can improve the mobility and environmental adaptability of soft-bodied bionic robots. Based on Yeoh’s second-order constitutive model of silica gel, the deformation analysis model of the actuator is established, and the rationality of the structure design and motion forms of the actuator and the accuracy of the deformation analysis model are verified by using the numerical simulation algorithm. According to the physical model of the pneumatic soft-bodied bionic actuator, the motion and dynamic characteristics of the actuator are tested and analyzed, the curves of motion and dynamic characteristics of the actuator are obtained, and the empirical formula of the bending angle and driving torque of the actuator is fitted out. The results show that the deformation analysis model and numerical simulation method are accurate, and the pneumatic soft-bodied bionic actuator is feasible and effective, which can provide a design method and reference basis for the research and implementation of soft-bodied bionic robot actuator.

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