Stabilizing slider-crank mechanism with clearance joints

2012 ◽  
Vol 53 ◽  
pp. 17-29 ◽  
Author(s):  
Ali Azimi Olyaei ◽  
Mohammad Reza Ghazavi
Keyword(s):  
Clearance Joints ◽  
Crank Mechanism

Analysis of the Dynamic Behavioral Performance of Mechanical Systems With Multi–Clearance Joints

2011 ◽  
Vol 7 (1) ◽  
Author(s):  
S.M. Megahed ◽  
A.F. Haroun
Keyword(s):  
Impact Force ◽  
Dynamic Performance ◽  
Mechanical Systems ◽  
Behavioral Performance ◽  
Clearance Joints ◽  
Revolute Joints ◽  
Clearance Joint ◽  
Computation Algorithm ◽  
Maximum Impact Force ◽  
Crank Mechanism

In this investigation, the effect of revolute joints’ clearance on the dynamic performance of mechanical systems is reported. A computation algorithm is developed with the aid of SolidWorks/CosmosMotion software package. A slider-crank mechanism with one and two clearance-joints is studied and analyzed when working in vertical and in horizontal planes. The simulation results point out that the presence of such clearance in the joints of the system understudy leads to high peaks in the characteristic curves of its kinematic and dynamic performance. For a multiclearance joints mechanism, the maximum impact force at its joints takes its highest value at the nearest joint to the input link. This study also shows that, when the mechanism works in horizontal plane, the rate of impacts at each clearance-joint increases and consequently the clearance-joints and actuators will deteriorate faster.

A Design Method for Reducing the Effects of Clearances at Revolute Joints

1985 ◽  
Vol 199 (2) ◽  
pp. 153-158 ◽  
Author(s):  
J K Shin ◽  
B M Kwak
Keyword(s):  
General Theory ◽  
Empirical Formula ◽  
Design Method ◽  
Mechanical Energy ◽  
Clearance Joints ◽  
Revolute Joints ◽  
Non Linear ◽  
Linear Spring ◽  
Crank Mechanism ◽  
Kinematic Properties

A method for designing a mechanism which is free of contact loss in clearance connections is developed. Only revolute joints are considered as possible clearance joints. Earles and Wu's empirical formula has been used for defining a perfect joint or contact loss free joint. A general theory for conditions of a perfect joint has been derived in terms of the mechanical energy and the kinematic properties of the joint. This general theory was applied to a slider crank mechanism and it was shown that designing a perfect joint is theoretically possible through balancing by a non-linear spring. Further it was shown that this technique gives a practical guide for balancing a mechanism with linear springs to reduce the possibility of contact loss in clearance joints.

Wear Analysis of Two Revolute Joints With Clearance in Multibody Systems

2016 ◽  
Vol 11 (1) ◽  
Author(s):  
Pei Li ◽  
Wei Chen ◽  
Desheng Li ◽  
Rufei Yu ◽  
Wenjing Zhang
Keyword(s):  
Dynamic Analysis ◽  
Multibody Systems ◽  
Mechanical Systems ◽  
Clearance Joints ◽  
Revolute Joints ◽  
Wear Analysis ◽  
Coupling Dynamics ◽  
System Life ◽  
Crank Mechanism

The wear of multiple joints with clearance is one of the main impacts on the life of mechanical systems while very limited study has been done on this subject. To be different with many existed researches focused on the dynamic analysis of multibody systems with multiple clearance joints, the wear of two revolute joints with clearance in multibody systems is analyzed in this paper by coupling dynamics with tribology. Based on a planar slider crank mechanism with two clearance joints, it is observed that the clearance sizes nonlinearly influence the wear depths of the two joints with clearance. Meanwhile, an appropriate relationship between the two joints' clearance sizes can significantly decrease the wear of the joints, which would greatly improve the system life. Both the independent and interactive influences of the two joints with clearances on the wear are investigated in this paper. The relation equations of the two clearances obtained in this work will significantly decrease the wear of the two clearance joints.

Complexity evaluation of nonlinear dynamic behavior of mechanisms with clearance joints by using the fractal method

2014 ◽  
Vol 228 (18) ◽  
pp. 3482-3495 ◽  
Author(s):  
Wuweikai Xiang ◽  
Shaoze Yan ◽  
Jianing Wu ◽  
Robert X Gao
Keyword(s):  
Dynamic Response ◽  
Dynamic Behavior ◽  
Nonlinear Dynamic ◽  
Correlation Dimension ◽  
Nonlinear Dynamic Response ◽  
Fractal Method ◽  
Motion Equations ◽  
Clearance Joints ◽  
Nonlinear Dynamic Characteristics ◽  
Crank Mechanism

Dynamic behavior of mechanisms with clearance joints often exhibits nonlinear dynamic characteristics due to the collisions between the journal and bearing. However, previous studies could not quantify the complexity of the dynamic response. In this paper, based on the Poincaré map and correlation dimension, a fractal method is proposed to evaluate the complexity of nonlinear dynamic response of mechanisms with clearance joints. Motion equations of mechanical systems with clearance joints are described. A slider–crank mechanism is employed to demonstrate the efficiency of the fractal method and to discuss the influence of the clearance size and crank speed on the complexity of the dynamic response.

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