Abstract
In recent years, the problem of automotive brake squeal during steering braking has attracted attention. Under the conditions of squealing, the loading of sprung mass is transferred, and lateral force is generated on the tire, resulting in stress and deformation of the suspension system. To predict the steering brake squeal propensity and explore its mechanism, we established a hybrid model of multibody dynamics and finite element methods to transfer the displacement values of each suspension connection point between two models. We successfully predicted the occurrence of steering brake squeal using the complex eigenvalue analysis method. Thereafter, we analyzed the interface pressure distribution between the pads and disc, and the results showed that the distribution grew uneven with an increase in the steering wheel angle. In addition, changes in the contact and restraint conditions between the pads and disc are the key mechanisms for steering brake squeal.
Highlights
Of various brake friction vibration and noise problems, brake squeal with high frequency (1∼16 kHz) and high intensity that often occurs under conditions of low automotive speed and low brake pressure [1] is a friction-induced vibration [2]. e brake squeal that occurs during steer braking is referred to as the steering brake squeal
Previous studies focused on squeal during straight-line braking, and they ignored the contact state changes between the pads and disc caused by the change in wheel angles and the deformation of the suspension system during steering operations. e six-dimensional wheel forces and wheel angles during straight and steer braking vary significantly; the suspension systems are affected by different forces. e main purpose of this study is to establish a hybrid model of multibody dynamics (MBD) and finite element (FE), predict the brake squeal propensity during automotive turning operations, and explore basic mechanism based on the abovementioned analysis. us, this study provides an effective reference for the design and engineering applications of brake systems
A hybrid model was developed for predicting the steering brake squeal propensity, and the mechanism of steering brake squeal was explored. e research established three clearly defined “stages” for steering brake squeal: Stage 1 consists of a road test of steering brake squeal based on a faulty vehicle and extracting the sound, vibration, and other characteristics when squeal occurs
Summary
Of various brake friction vibration and noise problems, brake squeal with high frequency (1∼16 kHz) and high intensity that often occurs under conditions of low automotive speed and low brake pressure [1] is a friction-induced vibration [2]. e brake squeal that occurs during steer braking is referred to as the steering brake squeal. Compared with the straight-line braking, the steering brake squeal is a new type of brake system noise, vibration, and harshness (NVH) problem, its frequency is low, and its dynamic phenomenon is more unstable. E parameters of the chassis corner system include the brake disc [10], lining, caliper, and bracket [11], and noise insulator [12] If these parameters remain unchanged, there is no squeal during straight-line braking. A three-dimensional dynamic model was employed to study the effect of the rich modal frequency of the brake disc on brake squeal [21]. Previous studies focused on squeal during straight-line braking, and they ignored the contact state changes between the pads and disc caused by the change in wheel angles and the deformation of the suspension system during steering operations. Previous studies focused on squeal during straight-line braking, and they ignored the contact state changes between the pads and disc caused by the change in wheel angles and the deformation of the suspension system during steering operations. e six-dimensional wheel forces and wheel angles during straight and steer braking vary significantly; the suspension systems are affected by different forces. e main purpose of this study is to establish a hybrid model of multibody dynamics (MBD) and FE, predict the brake squeal propensity during automotive turning operations, and explore basic mechanism based on the abovementioned analysis. us, this study provides an effective reference for the design and engineering applications of brake systems
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call