Dynamic Response Analysis of Planar Multilink Mechanism considering Wear in Clearances

Abstract

Clearance wear is one of the factors that affects dynamics for mechanical systems. A numerical methodology suitable for modeling and calculation of wear at multiple revolute clearance pairs in the field of the planar multilink mechanism is proposed. In this paper, the 2-DOF nine-bar mechanism considering two revolute clearance joints is regarded as the study object. Normal contact force and friction force models of revolute clearance joints used Lankarani–Nikravesh (L-N) and LuGre models, respectively. The iterative wear prediction process based upon Archard’s model has been applied to calculate wear characteristics. The wear prediction procedure is integrated with multibody dynamics, wear depths at revolute clearance joints are calculated, and the surface of shaft and bearing is reconstructed twice. The dynamic responses of mechanism considering two nonregular revolute clearances caused by wear are studied in depth. The nonlinear characteristics of the mechanism after wear are studied by the phase diagram and Poincaré map. Influences of different initial constant clearance values and different driving speeds on wear of two revolute joints are also researched. The results show that it is necessary to consider the factor of irregular clearances caused by wear in analysis of dynamics of precision mechanisms. Initial constant clearance values and driving speeds have some influence on wear phenomenon. This research provides a theoretical basis for studying dynamics of the planar multilink mechanism considering wear in multiple clearances.

Modeling and simulation for wear prediction in planar mechanical systems with multiple clearance joints

“…When the two parts are in contact and move relative to each other, the wear phenomenon occurs, which directly results in the gradual loss of material on the surface of these two parts [68,69]. Most of the previous wear prediction methods are based on the Archard wear model, which is a linear wear model and relates the wear amount to the contact conditions, such as the contact pressure, sliding distance and tribological data that reflecting the material information and the operating conditions in contact.…”

Modeling and Simulation for Wear Prediction in Planar Mechanical Systems with Multiple Clearance Joints

“…The generalized force corresponding to the generalized coordinates x , 1  , 2  , c x and c y can be written as: 24) and ( 25) into Eq (20), where the number of generalized coordinates is five, the dynamic information of this mechanism in each step can be obtained after some iterations. 4 Wear model of revolute joint with clearance When the two parts are in contact and move relative to each other, the wear phenomenon occurs, which directly results in the gradual loss of material on the surface of these two parts [68,69]. Most of the previous wear prediction methods are based on the Archard wear model, which is a linear wear model and relates the wear amount to the contact conditions, such as the contact pressure, sliding distance and tribological data that reflecting the material information and the operating conditions in contact.…”

Dynamic Responses of Planar Multilink Mechanism considering Mixed Clearances

“…Some scholars studied dynamic responses of planar simple mechanisms with revolute clearances by using the LuGre model to build friction, such as slider-crank mechanism. Studies on dynamical responses of planar multilink mechanisms containing multiple revolute clearances by combining the LuGre friction model are few [23][24][25][26]. Muvengei et al [23] analyzed dynamical responses of the crank-slider mechanism with clearances considering stickslip friction.…”

“…Muvengei et al [23] analyzed dynamical responses of the crank-slider mechanism with clearances considering stickslip friction. Jiang et al [24] studied on the wear characteristics of the multilink mechanism with multiple revolute pair clearances. Marques et al [25] examined and compared 21 different friction force models on dynamics of the crankslider mechanism with clearance.…”