Fiber glass has been widely used for automotive exhaust muffler to achieve good performance of noise reduction from the middle to the high frequency range. In this paper, the classification of the raw material and component of domestic fiber glass was studied experimentally. The results indicated that the domestic fiber glass can completely meet the requirements of acoustic attenuation performance.

A multi-body dynamics model for analyzing power-train mounting system is established by adopting MSC ADAMS/View. The correctness of the model is verified by the measurement data of the vibration response of each component of the mounting system in idling condition. According to energy decoupling theory, the stiffness of each component of the mounting system is considered as the design variable, and the reasonable matching of natural frequency is taken as the restraint. Then, the best improvement of the energy decoupling of the power-train in the direction of stimulation is selected as optimization target to improve the vibration characteristics of an economic car in idling condition. The result shows that, considering stiffness as the design variable only can realize the improvement of decoupling property. To gain the complete decoupling, some other influencing factors should be taken into consideration.

The dynamic model of the gear transmission system is built in consideration of the time-varying mesh stiffness and the gear errors. Then the time history of the dynamic load of system is obtained. The gear box structural-acoustic coupling system is built and calculated by using BEM. The noise spectrum of the gear box and the panel contribution are obtained. The effect of the gear box structure improvement, structure damping and different gear style on the noise radiation is analyzed. The study provides useful theoretical guideline to the design of the gear box.

The testing of drivers attention quality and reaction character under vehicles interior noise condition are performed by means of psychometric detecting method. By analyzing the test data measured, the differences of these two parameters under different noise levels is obtained. The analysis and conclusion may have practical significance for improving driver’s traffic safety.