scholarly journals Elastic Properties of the Fabric Liner and Their Influence on the Wear Depth of the Spherical Plain Bearing

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Xuejin Shen ◽  
Pandong Gao ◽  
Zhaolei Liu ◽  
Xiaoyang Chen
Keyword(s):  
Optimal Design ◽  
Theoretical Analysis ◽  
Elastic Properties ◽  
Woven Fabric ◽  
Wear Depth ◽  
Plain Bearing ◽  
Analysis Model ◽  
Compliance Matrix ◽  
Wear Reduction ◽  
Spherical Plain Bearing

The major failure mechanism of typical spherical plain bearings with self-lubrication is the wear of the woven fabric liner, which is an orthotropic composite of different elastic properties in different directions. The elastic properties of the liner are required for studying the tribological properties of the spherical plain bearings. This paper aims to develop an elastic property analysis model suitable for three commonly used fabric liners through a theoretical analysis of the elastic properties in order to obtain the parameter expression of the compliance matrix. The influence of the elastic properties on the wear depth of the spherical plain bearings is further investigated. Suggestions are made for the optimal design of the spherical plain bearings based on wear reduction.

Study on the Elastic Properties of the Woven Fabric Liner of Spherical Plain Bearing with Self-Lubricating

2010 ◽  
Vol 139-141 ◽  
pp. 190-193
Author(s):  
Zhao Lei Liu ◽  
Xue Jin Shen
Keyword(s):  
Elastic Properties ◽  
Theory Model ◽  
Woven Fabric ◽  
Plain Bearing ◽  
Analysis Model ◽  
Compliance Matrix ◽  
Calculation Results ◽  
Weave Pattern ◽  
Spherical Plain Bearing ◽  
Good Agreement

The structure of the woven fabric liner of spherical plain bearing with self-lubricating is introduced, according to the microstructure and the actual weave pattern of the liners, the fibre yarns undulation and the distance between two fibre yarns are taken into account. A general elastic properties analysis model adjusting to the stain woven fabric liner is built. The elastic properties of the fabric liner are obtained using the method of micromechanical through getting the material and geometric parameters of the fiber yarns in the basis of stiffness average. The parameter expression of the compliance matrix and nine elastic constants are obtained and the theory model of fabric liner is validated by the experiment. The calculation results are in good agreement with the experimental data.

Modeling and verification of comprehensive errors of real-time wear-depth detecting for spherical plain bearing tester

2017 ◽  
Vol 24 (3) ◽  
pp. 533-545 ◽  
Author(s):  
Wei Li ◽  
Zhan-qi Hu ◽  
Yu-lin Yang ◽  
Bing-li Fan ◽  
Hai-li Zhou
Keyword(s):  
Real Time ◽  
Wear Depth ◽  
Plain Bearing ◽  
Spherical Plain Bearing

The Discussion about Thermal Stress Analysis of Spherical Plain Bearings

2012 ◽  
Vol 479-481 ◽  
pp. 305-308
Author(s):  
Yu Feng Huang ◽  
Xue Jin Shen ◽  
Shuai Lv ◽  
Lei Cao
Keyword(s):  
Finite Element ◽  
Simulation Method ◽  
Plain Bearing ◽  
Sliding Velocity ◽  
Analysis Model ◽  
Element Analysis ◽  
Finite Element Analysis Model ◽  
The Mean ◽  
Spherical Plain Bearing ◽  
Bearing System

Spherical plain bearing was applied widely in industry. In the paper, with the finite element code Abaqus, a sequentially coupled, 3D, and thermal-mechanical finite element analysis model of the bearing system was built up based on the theories of heat transfer, tribology and composite material mechanics. The paper focused on effects of the mean sliding velocity and the load. In the end, the paper mentioned a simulation method of computing wear.

Comprehensive error modeling of real-time wear-depth detecting of spherical plain bearing tester

2016 ◽  
Vol 24 (4) ◽  
pp. 844-854 ◽  
Author(s):  
李巍 LI Wei ◽  
胡占齐 HU Zhan-qi ◽  
杨育林 YANG Yu-lin ◽  
周海丽 ZHOU Hai-li ◽  
郑晓强 ZHENG Xiao-qiang
Keyword(s):  
Real Time ◽  
Error Modeling ◽  
Wear Depth ◽  
Plain Bearing ◽  
Spherical Plain Bearing

scholarly journals Molecular Simulation and Theoretical Analysis of Slide-Ring Gels under Biaxial Deformation

Gels ◽  
2021 ◽  
Vol 7 (3) ◽  
pp. 129
Author(s):  
Kotaro Tanahashi ◽  
Tsuyoshi Koga
Keyword(s):  
Theoretical Analysis ◽  
Molecular Mechanism ◽  
Elastic Properties ◽  
Mechanical Characteristics ◽  
Slip Model ◽  
Biaxial Deformation ◽  
New Type ◽  
Cross Links ◽  
Nonlinear Stretching ◽  
Stretching Effect

Slide-ring (SR) gels, a new type of gels that have cross-links moving along the chains, are known to have unique mechanical characteristics. In the case of biaxial deformations, it has been experimentally shown that the stress–strain (S–S) relationships of SR gels can be well described by the neo-Hookean (NH) model. This behavior is quite different from that of conventional chemical gels, where the S–S curves deviate from the NH model. To understand the molecular mechanism of such peculiar elastic properties of SR gels, we studied the effects of movable cross-links by using molecular simulations and theoretical analysis. We calculate the S–S relationships in biaxial deformation for two types of models: slip model, where the cross-links can slide along chains representing SR gels, and non-slip model, which corresponds to conventional chemical gels. In the theoretical analysis, we calculate the S–S relationships by using the models with the Gaussian and the Langevin chains to investigate the nonlinear stretching effect of the chain in the slip and non-slip models. As a result, we found that the peculiar elastic behaviors of SR gels in biaxial deformations are well explained by the effect of movable cross-links suppressing the nonlinear stretching of the chain.

Experimental Research on Parameters Identification of Dynamic Characteristic for Parallel Machine Tool

2013 ◽  
Vol 300-301 ◽  
pp. 181-184
Author(s):  
Chun Xia Zhu ◽  
Zhi Wen Chen ◽  
Bo Liu ◽  
Jing Wang
Keyword(s):  
Optimal Design ◽  
Theoretical Analysis ◽  
Machine Tool ◽  
Dynamic Characteristic ◽  
Parallel Machine ◽  
Vibration System ◽  
Flexible Coupling ◽  
Vibration Model ◽  
Experiment Method ◽  
Parallel Machine Tool

The dynamic characteristics of parallel 3-TPT machine tool are researched by experiment in this paper. Firstly, modal analysis principle of machine tool was analyzed in theory, and the parameters of dynamic characteristic were identified by theoretical analysis. Then vibration model of parallel machine tool was built and formed vibration system of rigid and flexible coupling for analysis. Then, the modal experiment method and steps were introduced, and the experiment parameters also were identified according to the experiment results. The result dates are showed that the result dates are validated. So the experiment method is feasible by experimental verification, which provides reference for dynamic optimal design.

scholarly journals Performance Analysis of Switched Control Systems Under Common-source Digital Upsets Modeled by MDHMM

Complexity ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Rui Wang ◽  
Yanxiao Li ◽  
Hui Sun ◽  
Youmin Zhang ◽  
Yigang Sun
Keyword(s):  
Theoretical Analysis ◽  
Control Systems ◽  
Systems Design ◽  
Performance Degradation ◽  
Common Source ◽  
Complex Environments ◽  
Analysis Model ◽  
Redundant Design ◽  
Control Systems Design ◽  
The Relationship

This paper proposes the theoretical model to analyze the performance degradation of control systems subject to common-source digital upsets. In this paper, a multidimensional hidden Markov model (MDHMM) is used to characterize the correlated upsets and reveals the relationship between complex environments and stochastic random digital upsets injected into the control systems. These digital upsets coming from artificial complex environments are operated on distributed redundant processing controllers. Furthermore, this paper develops the theoretical analysis model for performance degradation of control systems under common-source digital interferences modeled by MDHMM. Theoretical estimations for different redundant configurations are analyzed. Then corresponding simulation verifications for a specific control system are also conducted in details and compared with the theoretical analysis results. These analyses can help to select an optimal redundant design and provide an example for control systems design. This analysis also helps to balance the performance of system, reliability of system, and costs of system design in applications.

Study of Liquid-Metal Based Heating Method for Temperature Gradient Focusing Purpose

2013 ◽  
Vol 135 (9) ◽  
Author(s):  
M. Gao ◽  
L. Gui ◽  
J. Liu
Keyword(s):  
Optimal Design ◽  
Temperature Gradient ◽  
Liquid Metal ◽  
Theoretical Analysis ◽  
Numerical Simulations ◽  
Microfluidic Channels ◽  
Heating Method ◽  
Electrical Heater ◽  
Temperature Gradient Focusing ◽  
A New Technique

Temperature gradient focusing (TGF) is a highly efficient focusing technique for the concentration and separation of charged analytes in microfluidic channels. The design of an appropriate temperature gradient is very important for the focusing efficiency. In this study, we proposed a new technique to generate the temperature gradient. This technique utilizes a microchannel filled with liquid-metal as an electrical heater in a microfluidic chip. By applying an electric current, the liquid-metal heater generates Joule heat, forming the temperature gradient in the microchannel. To optimize the temperature gradient and find out the optimal design for the TGF chip, numerical simulations on four typical designs were studied. The results showed that design 1 can provide a best focusing method, which has the largest temperature gradient. For this best design, the temperature is almost linearly distributed along the focusing microchannel. The numerical simulations were then validated both theoretically and experimentally. The following experiment and theoretical analysis on the best design also provide a useful guidance for designing and fabricating the liquid-metal based TGF microchip.

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