Simulating Multibody Dynamics With Rough Contact Surfaces and Run-in Wear

Abstract

Abstract. The overall dynamics of a multibody system is actually a multi-scale problem because it depends a great deal on the local contact properties (coefficient of restitution, friction, roughness, etc). In this paper we found that the briefly presented force-based theory of plane dynamics for a multibody system with unilateral contacts was appropriate for simulating detailed multi-contact situations of rough contacting surfaces.The focus of the paper is on a geometrically detailed description of rough surfaces. To achieve the run-in effect of the contacting surfaces under dynamical loads the contacting surfaces need to be re-shaped. For the re-shaping a wear model based on the local loss of mechanical energy under dynamical loads is presented.The new ideas are presented for a numerical analysis of measuring the coefficient of friction at the rim of a wheel (rotating body). With the help of the analysis the experimentally observed change in the measured coefficient of friction of up to 30% for only slightly altered experimental conditions is explained.

A comprehensive survey of the analytical, numerical and experimental methodologies for dynamics of multibody mechanical systems with clearance or imperfect joints

“…The results indicated that for solving contact problems with friction and wear, the proposed method could avoid the singularity problem of the classic quasi-static assumption. Using the LCP algorithm, Slavič and Boltežaer [428] modeled and simulated a planar multi-rigid-body system with rough contacting surfaces. In this work, a wear model based on the local loss of mechanical energy was proposed to reshape the rough contacting surfaces under dynamical loads.…”

Non-smooth dynamic analysis of curved bridges considering the earthquake-induced end-pounding

“…As the number of contacts increases, the detection process is very complex and becomes computationally demanding. Non-smooth approaches allow solving rigid bodies' dynamic response and contact interactions by converting unilateral constraints into a linear complementarity problem (LCP) [23][24][25][26][27]. LCP methods represent rigorous and effective ways to detect the actual contact events in non-smooth systems.…”

A Method of Assessing the Service Life and Reliability of Motor Brushes Based on Wear Under Variable Current and Environmental Conditions

“…Slavicˇ J et al have studied a wear model on the local loss of mechanical energy under dynamic loads. The result has shown the dynamic relationship of the brush with the rough contact surface and determined the coefficient of friction for different temperatures and currents [27,28]. Alesˇ Turel et al, have studied the wear and contact resistance of sliding contacts and are typically researched with a pin-on-disk experiment that prevents dynamic excitation.…”