Piezoelectric-based dither control for automobile brake squeal suppression under various braking conditions

Abstract

Automobile brake squeal noise, which is nonlinear, friction-induced vibration in the frequency range 1–16 kHz, still remains a major problem for the automotive industry. This article presents analytical and experimental investigations into the application of dither control for active suppression of automobile disc brake squeal. Dither is a concept of active control that introduces high-frequency actuation into a system to suppress a much lower frequency disturbance. In this study, a specially designed brake system is built, in which a piezoelectric stack actuator in the piston of a floating caliper brake applies the dither input. In the experiments, squeal noise generated under the drag mode and various dynamic modes are considered. The results indicate that this piezoelectric-based dither control could effectively suppress the brake squeal noise by 5–10 dB and the squeal occurrence by up to 60% under various braking conditions.

Vibration Performance Analysis and Multi-Objective Optimization Design of a Tractor Scissor Seat Suspension System

“…Step 1: Normalization process The DOE method is used to obtain experimental samples between design variables and performance objectives. The design variables have different design spaces, and the contribution values vary from the design space, requiring normalization of the sample data inputs using Equation (7).…”

“…Due to the strong vibration caused by the complex working conditions of the tractor [4], the driver's long-term work in this environment will impact his physical and mental health [5]. Tractors are bound to produce certain vibrations during farming operations, and the main reasons for these vibrations are the vibration of the whole vehicle caused by uneven road surfaces [6]; vibrations caused by sudden acceleration, braking, and steering of the vehicle while driving on the road [7]; the vibration caused by coupling when the engine and transmission mechanism is rotating [8]; among them, the uneven road surface is the main cause of vehicle vibration. Therefore, it is meaningful to study the vertical vibration caused by uneven road surfaces [9].…”

An overview of the development of intelligent materials and active vibration isolation systems for vehicles

“…Figure 11.Calculated SPL spectra at the virtual point of driver's right ear in the cavity model[20]. Literature[21] designed a piezoelectric laminated actuator for jitter control experiments on the squeal noise of automotive disc brakes. The result is that a piezoelectric ceramic vibration control can reduce the squeal noise of brake under random braking state and control its occurrence at around 60%.…”