Investigation of Stick-Slip Vibration in a Commercial Vehicle Brake Assembly

Abstract

There are several types of disc brake instabilities associated with the brake systems; however, they are usually classified into two main categories depending on the frequency range: brake groan 0-300 Hz and brake squeal 1-16 kHz. The groan is associated with the stick-slip motion while the squeal is associated with the modal coupling. This paper presents a detailed analysis of low frequency noise (0-300 Hz) in a commercial vehicle trailer disc brake as a result of stick-slip vibration. A range of experimental techniques are used to understand the characteristic behaviour of the caliper and the brake pads during braking events on a laboratory test rig. The analysed brake system comprised a full disc brake assembly and the trailer suspension system with a beam axle. Laser-based optical displacement sensors were used to investigate the deformation of the caliper body and the brake pads during a braking application. The contact pressure distribution at the disc/pad interfaces were also measured to gain more insight into the contact profile of the pad surfaces. Results revealed that the stick-slip phenomenon, in this study, was a result of the combination of the deformation of the caliper and the friction material formulation of the brake pads. In addition, it was observed through the testing of two different sets of pads that a low compression modulus would help to reduce the stick-slip phenomenon.

ANALYSIS OF VIBRATION MODES OF SEMI-TRAILER AXLE AND their effects on FATIGUE LIFE

“…Higher frequency vibrations can also be transferred to the load. Source may be road irregularities when the truck is traveling at maximum speed or vibrations generated during braking [11,12].…”

Measurement method of tooth friction force for helical gears by laser displacement sensor

“…Laser displacement sensor has many advantages, such as high accuracy, high sensitivity and small hysteresis, which is widely used in mechanical vibration measurements [23][24][25]. Recently, laser displacement sensor was used to experimentally study the deformation of the mechanical component.…”

Surrogate model approach for investigating the stability of a friction-induced oscillator of Duffing’s type

“…These dynamic instabilities, also called stick-slip motion result in self-excited vibrations and drastic decreases in performance of some machine parts. Oscillating systems excited by dry friction are frequently encountered in many practical applications, including for instance brake systems [2,3], hydraulic cylinders [4], gears [5] or bearing [6]. Therefore the extensive analysis of these non-smooth dynamic systems to detect instabilities is a crucial point in engineering design.…”