Abstract
Contact stiffness and friction coefficient are excitation sources and key influencing factors to frictional squeal with obvious inhomogeneous characteristic that is always neglected. In this paper, a multipoint contact flexible pin-on-disc system is established considering tangential stiffness. Then influence of contact stiffness and friction coefficient with heterogeneous distribution on frictional squeal is studied using the complex modal analysis. The research shows that contact stiffness and friction coefficient heterogeneities influence the likelihood of occurrence of the squeal, the frequency of the squeal, and the real part of the complex eigenvalue of the system. And when the contact stiffness and friction coefficient are close to the boundary of the region of mode-coupling instability, flexible pin-on-disc system with homogeneous contact stiffness and friction coefficient cannot predict whether frictional squeal occurs or not. Besides, uncertain distribution of contact stiffness and friction coefficient can induce the uncertainty of brake squeal.
Highlights
Frictional squeal has high frequency and high intensity and it exists widely in various mechanical systems such as brake system, clutch, and train wheel/rail [1, 2]
The mean values of the normal contact stiffness and friction coefficient indicate the magnitude of the normal contact stiffness and friction coefficient, and the coefficient of dispersions of the normal contact stiffness and friction coefficient indicate the degree of heterogeneity
This paper describes the development of a complex eigenvalue analysis of a flexible pin-on-disc system considering tangential contact stiffness
Summary
Frictional squeal has high frequency and high intensity and it exists widely in various mechanical systems such as brake system, clutch, and train wheel/rail [1, 2]. It is of great importance to study the influence of contact stiffness and friction coefficient with heterogeneous distribution in contact surface on frictional squeal. The influence of the friction coefficient and contact stiffness was always investigated based on analytical models [9, 10] and finite element models [11, 12], and it has been accepted that high values for friction coefficient lead to high levels of dynamic instability [13, 14]. Some studies investigated the influence of heterogeneous contact stiffness on frictional squeal but heterogeneous friction coefficient was neglected [15]. This hinders further understanding of the mechanism of frictional squeal and reduced the prediction accuracy of frictional squeal frequency
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