Experimental and numerical investigation of friction-induced vibration of a beam-on-beam in contact with friction

Abstract

International audienceThe vibrations generated by friction are responsible for various noises such as squealing, squeaking and chatter. Although these phenomena have been studied for a long time, it is not well-understood. In this study, an experimental and numerical study of friction-induced vibrations of a system composed of two beams in contact is proposed. The experimental system exhibits periodic steady state vibrations of different types. To model and understand this experimental vibratory phenomenon, complex eigenvalue and dynamic transient analyses are performed. In the linear complex eigenvalue analysis, flutter instability occurs via the coalescence of two eigenmodes of the system. This linear study provides an accurate value of the experimental frequency of vibration. To understand what happens physically during friction-induced instability, a dynamic transient analysis that takes account of the non-linear aspect of a frictional contact is performed. In this analysis, friction-induced instability is characterized by self-sustained vibrations and by stick, slip and separation zones occurring at the surface of the contact. The results stemming from this analysis show that good correlation between numerical and experimental vibrations can be obtained (in time and frequency domains). Moreover, time domain simulations permit understanding the physical phenomena involved in two different vibratory behaviours observed experimentally. (C) 2010 Elsevier Ltd. All rights reserved

Nonlinear transient and chaotic interactions in disc brake squeal

“…"Periodic intermittent" [39] bursts owing to partial pad lift-offs have been observed experimentally in transient selfexcited vibrations [40] and also in numerical/experimental investigations of a beam-on-beam setup [21]. Low-dimensional possibly chaotic dynamics of structural vibrations were experimentally observed by Wernitz and Hoffmann [33] during steady sliding conditions in friction brakes.…”

“…1(b)). [20] or in finite element time domain simulations [21]. Bursts of irregularity have been observed in analytical friction oscillators [41] and in dynamic systems and can be related to the intermittency route to chaos.…”

Experimental Evaluation of Brake Pad Material Propensity to Stick-Slip and Groan Noise Emission

“…As a function of the interface materials, the boundary conditions and the system dynamics, the system response can result in either stable or unstable vibrations [7][8][9]. This leads to different contact scenarios [10,11], such as stable sliding with "friction noise" [12][13][14][15], macroscopic stick-slip instability [16][17][18][19], or mode coupling instability [3,[20][21][22][23]. In the brake industry, the different noise emissions, resulting from the contact between the lining material and the disc surface during the braking phase, are associated to these different frictional scenarios.…”

The Friction-Induced Vibration of Water-Lubricated Rubber Bearings during the Shutdown Process

“…Deleau et al [16] simulated the contact and friction behavior of a rubber blade/windscreen by studying the friction behavior of the rubber/glass contact. It is a fact that the key to studying and reducing the friction-induced vibration and noise is to understand the generation of noise sources, and so far, many researchers have carried out experimental studies [17,18] and numerical simulations [19][20][21][22] and used finite element methods [23].…”