04-10-2017, 02:45 PM
17-10-2017, 04:56 PM
It can be understood in the following image:
![[Image: slide-10.jpg]](http://www.campusoxide.com/userfolder/1166/document/804/images/slide-10.jpg)
Since the comfort of the vehicle has become such an important factor in indicating the quality of a passenger car, eliminating or reducing the noise and vibration of a vehicle structure and system seems to provide a market advantage for manufacturers of vehicles. With the progress towards other aspects of vehicle design, improved vehicle vibration and noise through improvement, refinement in vibrations and brake noise is inevitable. This can be seen in the literature where awareness about vibration and brake noise problems began as early as the 1930s.
Early studies on noise and vibration of brakes attempted to identify techniques to eliminate and / or reduce noise and vibration and later gradually focused on their generation mechanisms. Since then, the problem of noise and vibration in the brake has been studied with experimental, analytical and computational methods, but there is still no method to completely suppress the noise and vibration of the brake in general and the screech in particular. In addition, a complete understanding of the problem has not yet been achieved. Papinniemi et al (2002) suggested that these are due to the complexity of the mechanisms themselves and the competitive nature of the automotive industry, which limits the amount of cooperative research, ie, published in the open literature.
There are several categories of noise and vibration of the brakes and can be defined according to the mechanism of generation. Lang and Smales (1983) classified various types of vibration problems such as migraine, groaning, buzzing, screeching, screeching and wire brushing. In a recent review, Ouyang et al (2005) suggested three major categories of noise and brake vibration as follows: creep-groan, judder and squeal. Of these categories, squealing is the most irritating and bothersome to both customers and the environment, and it is costly for vehicle manufacturers due to warranty payments. The scream has been the main subject of previous studies on the noise and vibration of the disc brake and is the focus of this research.