Abstract
Brake noise, a principal component of vehicle noise, is among the most critical measures of vehicle quality. The perceived quality of cars can be improved by reducing brake noise; therefore, vehicle manufacturers are extensively investigating the influencing factors, generating mechanism, and solutions of brake noise. Compressive strain is one of the most influential performance parameters of a brake pad and can be adjusted by regulating the material elastic modulus and by modifying the shape of the brake lining. In this study, the compressive strain of a brake pad was adjusted through four methods, and the noise characteristics of brake pads with different elastic modulus, section outlines, lining widths, and chamfers were studied through finite element analysis and the complex-eigenvalue method. The effects of compressive strain of a brake pad on brake noise were examined, and an optimized brake-pad scheme was developed. A dynamometer test conducted to validate the effectiveness of the optimized scheme confirmed a clear alleviation in brake noise.
Highlights
Brake noise, high-frequency brake squeal, is one of the principal components of vehicle noise; it can cause noise pollution and directly affect ride comfort [1]
The most common brake system, is widely used in passenger cars and light commercial vehicles. e ride comfort of a vehicle can be substantially improved by reducing brake noise; noise control of disk brakes has become a focal research area in vehicle noise, vibration, and harshness (NVH) engineering
Numerous studies have investigated the effects of geometrical characteristics and material properties of brake pads on brake noise
Summary
High-frequency brake squeal, is one of the principal components of vehicle noise; it can cause noise pollution and directly affect ride comfort [1]. Brake systems—in particular, the geometrical characteristics and material properties of brake-system components—are typically modeled and analyzed through finite element analysis, primarily the frequency-domain complexeigenvalue method and transient state dynamics analysis [3]; the former was first developed in the 1980s and has since become one of the most widely used approaches in brake design for predicting brake noise [4]. Compressive strain was used as the unified parameter; it was regulated through various technical methods, and the consequent effects on noise reduction were compared. The assembly of brake systems equipped with pads with different structural and material properties was analyzed through the finite element and complex-eigenvalue methods, and the effect of these brake pads on brake noise was studied
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