An Analytical Contact Model for Design of Compliant Fingers

2007 ◽  
Vol 130 (1) ◽  
Author(s):  
Chao-Chieh Lan ◽  
Kok-Meng Lee
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Structural Reliability ◽  
Contact Problems ◽  
Contact Forces ◽  
Constrained Minimization ◽  
The Other ◽  
One Dimension ◽  
Shear Deformations ◽  
Element Analysis

A compliant gripper gains its dextral manipulation by the flexural motion of its fingers. It is a preferable device as compared to grippers with multijoint actuations because of reduced fabrication complexity and increased structural reliability. The prediction of contact forces and deflected shape are essential to the design of a compliant finger. A formulation based on nonlinear constrained minimization is presented to analyze contact problems of compliant fingers. The deflections by flexural and shear deformations are both considered. For a planar finger, this formulation further reduces the domain of discretization by one dimension. Hence, it offers a simpler formulation and is computationally more efficient than other methods such as finite element analysis. This method is rather generic and can facilitate design analysis and optimization of compliant fingers. We illustrate some of these attractive features with two types of compliant fingers, one for object handling and the other for snap-fit assembly applications.

scholarly journals Research on Bridge Structure Reliability Evaluation due to Vessels Collison Based on a Statistical Moment Method

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Tao Fu ◽  
Yang Liu ◽  
Zhixin Zhu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Moment Method ◽  
Structural Reliability ◽  
Statistical Moment ◽  
Bridge Structure ◽  
Element Analysis ◽  
Performance Function ◽  
Structural Resistance ◽  
Collision Force

Damage to bridge structures caused by vessel collision is a risk for bridges crossing water traffic routes. Therefore, safety around vessel collision of existing and planned bridges is one of the key technical problems that must be solved by engineering technicians and bridge managers. In the evaluation of the reliability of the bridge structure, the two aspects of vessel-bridge collision force and structural resistance need to be considered. As there are many influencing parameters, the performance function is difficult to express by explicit function. This paper combines the moment method theory of structural reliability with finite element analysis and proposes a statistical moment method based on finite element analysis for the calculation of vessel-bridge collision reliability, which solves the structural reliability problem with a nonlinear implicit performance function. According to the probability model based on current velocity, vessel velocity, and vessel collision tonnage, the estimate points in the standard normal space are converted into estimate points in the original state space through the Rosenblatt reverse transform. According to the estimate points in the original state space and the simplified dynamic load model of vessel-bridge collision, the sample time-history curve of random vessel-bridge collision force is generated, the dynamic response of the bridge structure and the structural resistance of the bridge are calculated by establishing a finite element model, and the failure probability and reliability index of the bridge structure is calculated according to the fourth-moment method. The statistical moment based on the finite element analysis is based on the finite element analysis and the moment method theory of structural reliability. The statistical moment of the limited performance function is calculated through a quite small amount of confirmatory finite element analysis, and the structural reliability index and failure probability are obtained. The method can be widely used in existing finite element analysis programs, greatly reducing the number of finite element analyses needed and improving the efficiency of structural reliability analysis.

Damage Analysis and Limit Tending Design of Thrust Bearing in esPCP System

2007 ◽  
Vol 345-346 ◽  
pp. 525-528
Author(s):  
Shi Jie Wang ◽  
Kang Jian ◽  
Lv Jianhua
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Thrust Bearing ◽  
Contact Problems ◽  
Damage Analysis ◽  
Analysis Software ◽  
Element Analysis ◽  
Optimum Selection ◽  
Material Contact ◽  
Petroleum Oil

Thrust bearing is one of the most important components in esPCP system, which determines the lifespan of the whole system under the restriction of some factors such as the depth of downhole unit, the viscosity of petroleum oil to be pumped. To increase the high temperature bearing ability of the bearings under the limitation of radial size, the damage reason of pre-applied bearings was analyzed. Some different modified plans were put forward from two aspects of structure and material. Contact problems were researched for different plans with finite element analysis software of ANSIS. Comparison of results shows that, in the well of 5½" tube, the optimum selection is ball thrust bearing with 8 balls of radial size of 10mm without keeper.

Study on the Thermal Field Distribution of Steel Claws for Anode in Aluminium Electrolysis Cell

2015 ◽  
Vol 1120-1121 ◽  
pp. 1089-1092
Author(s):  
Qing Dong Qin
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Field Distribution ◽  
Thermal Field ◽  
Voltage Drop ◽  
The Other ◽  
Electrolysis Cell ◽  
Aluminium Electrolysis ◽  
Element Analysis ◽  
Anode Carbon

The electricity consuming of aluminium electrolysis cell is affected by the voltage drop of anode steel claws during the aluminium electrolysis course. The resistivity of anode steel claws is affected by the temperature. In the present study, the thermal field distribution of anode steel claws was studied by finite element analysis. The results show that the thermal energy of anode steel claws come from anode carbon blocks and environment. The temperature of steel claws less than 1/3 height is affected by anode carbon blocks, and the other part is affected by surrounding temperature. According the results, the principle of the new anode steel claw design is proposed.

Adaptive finite element analysis of fractal interfaces in contact problems

2000 ◽  
Vol 182 (1-2) ◽  
pp. 17-37 ◽  
Author(s):  
Guang-Di Hu ◽  
P.D. Panagiotopoulos ◽  
Panagouli ◽  
O. Scherf ◽  
P. Wriggers
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Contact Problems ◽  
Adaptive Finite Element ◽  
Element Analysis

Finite-Element Analysis and Reliability Test of Power Steering Gear on the Fatigue Performance

2012 ◽  
Vol 271-272 ◽  
pp. 927-931
Author(s):  
Ying Wu ◽  
Jun Li ◽  
Wen Hao Lu ◽  
Shi Yuan Xiong
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Developed Countries ◽  
The Other ◽  
Fatigue Properties ◽  
Reliability Test ◽  
Element Analysis ◽  
Input Shaft ◽  
Power Steering ◽  
Fea Model

The study on power steering gear is less than other auto parts at home or abroad. Compared with developed countries, the independent design and manufacture of power steering starts late, and lacks practical and effective evaluation standards. The combination of the theoretical analysis, numerical calculation and experimental verification is the key technology to optimize the design or test to evaluate the power steering gear’s function and performance. In this paper, the power steering gear’s finite element analysis(FEA) model was built to analyse the fatigue stress and fatigue life of the power steering gear’s components, such as housing, input shaft and output shaft. and the fatigue test of the power steering gear was also designed and implemented. Research showed that, the power steering gear fatigue properties of FEA and reliability test have the same results. The total damage of 4 A-B-C event cycles is less than 1, the steering gear system is judged safe after 4 event cycles per design requirements. Each component of the power steering gear has different maximum average stress. The stress of the sector shaft, the piston and the screws is very close to the yield stress, which is much larger than the other components, and needed to be treated with caution The maximum stresses of the gear housing are a little over the yield strengths at the stress of 6,118 lbs, which is more dangerous than the other components, and great attention should be paid to it.

Finite Element Analysis of Input Axis in Six-Speed Transmission

2013 ◽  
Vol 477-478 ◽  
pp. 45-48
Author(s):  
Qing Dun Zeng ◽  
Xin Pan
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fatigue Life ◽  
Simulation Analysis ◽  
Virtual Prototype ◽  
Contact Forces ◽  
Element Analysis ◽  
Virtual Prototype Technology ◽  
Gear Contact ◽  
D Model

The joint simulation of Virtual Prototype Technology and Finite Element Method was utilized to perform the analysis of both strength and fatigue life of the input axis in a six-speed vehicle transmission with three axes. Firstly, the software Pro/E was used to establish a 3-D model of the input axis and its gear engagement, and the model was then imported into a software ADMAS of the virtual prototype technology to perform a dynamic simulation analysis. Secondly, the gear contact forces obtained by above-mentioned analysis were used as the loading condition of finite element analysis of the input axis to check its strength. Finally, the fatigue of meshing teeth on the input axis was analyzed to determine the fatigue life of the input axis. The results show that the static strength of input axis can meet the requirement of safe use under the working condition of input torque T=1.5kN·m, and the minimum fatigue life on the place where the stress is maximum at flexural root of a tooth is about 2 million times.

scholarly journals Finite element analysis of general contact problems and application for excavation of shield tunnel.

1998 ◽  
pp. 1-10
Author(s):  
Hiroshi Takeda ◽  
Morito Kusabuka ◽  
Tamotsu Yoshida ◽  
Hiroshi Tanaka ◽  
Nobuko Kurokawa
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Contact Problems ◽  
Shield Tunnel ◽  
Element Analysis
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