In the vehicle industry, noise issues have become more evident. Vehicle noise source identification is an important prerequisite for noise control. In recent years, new methods of vehicle noise source identification have been developed, but it is necessary still for them to improve and optimize. The different methods for identifying noise sources are reviewed in this paper. All methods are divided into three categories, i. e. the traditional analysis method, the method based on signal processing, and method based on acoustic array technology. The features of various identification method are described and compared. Finally, some prospects of noise source identification method are given.

It is difficult to establish a precise physical model for simulation of traditional leaf spring. In this paper the physical model of a leaf spring was built with some nonlinear effects, such as large deformation, interleaf friction and contact, considered simultaneously. The method for analyzing the distributions of contact pressure and friction in the contact interface between the adjacent leaves was put forward. The deformation, Von Mises equivalent stress, and contact and friction forces were determined for different friction coefficients and loads, and their influences on mechanics characteristics of the leaf spring were studied. The relation of contact pressures, friction stress and contact stress in the contact interfaces of the leaves was studied. The paper provides a reference for studying the nonlinear states between the adjacent leaves in the leaf spring.