求翻译：排气系统噪声是整车车外加速噪声的一个主要噪声源，对整车噪声贡献量为16.6%。本章利用GT-Power对某款乘用车排气系统进行数值模拟，为降低进、排气系统噪声提供整改依据。整车的排气噪声以低频和中频为主，因此该车型的排气消声器应具有良好的低频及中频的消声特性。是什么意思？

Vehicle exhaust system noise is noise outside the car to accelerate a major noise source, the amount of vehicle noise contribution of 16.6%. This chapter using GT-Power exhaust system of a passenger car models to simulate, in order to reduce the intake and exhaust system noise to provide corrective

Exhaust system noise is noise of speeding up the whole car, one of the main noise source, the whole car noise contribution to 16.6 % in volume. Use this chapter to a subsection multiplied by Power GT - Used Car exhaust systems for numerical simulation, in order to reduce noise, exhaust system to pro

三种声学指标都可以用于评价消声元件或者整个系统的声学性能。传递损失与声源特性、元件出口的阻抗没有关系，因此是评价单个消声元件的指标; 插入损失不仅与消声元件的消声性能有关。还与源阻抗、元件声学出口阻抗有关，因此它是评价整个系统的消声效果的; 消声量与消声元件的消声性能和元件声学出口的阻抗有关，因此他也可以用于评价消声元件和整个系统，但它与声源阻抗无关。

Is vehicle exhaust system noise outside the car acceleration noise a noise sources, on vehicle noise contribution to 16.6%. This chapter uses GT-Power for numerical simulation of a passenger car exhaust systems, providing noise reduction of intake and exhaust system with rectification and reform acc

Exhaust system noise is of accelerated vehicle car noise a noise sources, on vehicle noise contribution of 16.6%. This chapter uses GT-Power for numerical simulation of a passenger car exhaust systems, providing noise reduction of intake and exhaust system with rectification and reform according to.