燃料电池汽车是采用燃料电池动力系统的新型零排放环保汽车，其噪声源是分布式的，车内噪声组成比较复杂，噪声的线性度没有传统汽车好，因此亟需改善其车内声音品质，使人们在享受能源环保的同时也能有舒适的乘坐环境。论文测试某型燃料电池轿车怠速工况车内噪声，进行车内噪声的频谱分析。以响度作为声品质评价指标，提出了改善车内声品质应着重考虑的频率范围，同时结合噪声频谱分析，采用参数化滤波方法对主要峰值频率进行处理，找出对人耳主观感觉影响较大的频率或频段。为了降噪和改善车内声品质，采取分别运行法进行物理问题识别，找出对乘员主观感觉影响较大的频率和频段产生的声振部件，实现从声品质问题到物理问题的转换，研究发现车内噪声上述频率和频段主要是由燃料电池辅助系统（氢泵和风机）产生的。

Fuel cell vehicle (FCV) is a sort of clean energy vehicle with zero emission. And its noise source layout spread out the front and rear part of the FCV. As a result, it is called distributed noise source. Because the interior noise of the FCV is composed of multiple noise sources, the linearity of the interior noise of the FCV is worse than that of the conventional cars. Therefore, the sound quality of the FCV should be improved so that the customers can enjoy the clean energy and comfortable environment simultaneously. Spectral characteristics of noises measured inside the FCV at idle are analyzed. The loudness value is used to evaluate the interior noise of the FCV. Based on evaluation results, the frequency ranges for improving the sound quality of interior noise are put forward. Combined with the spectral analysis results, the parametric filtering method is used to prepare 29 sound samples to find the critical frequency which affected the human ear’s subjective sensation seriously. A virtual validation about the effect of the design parameters on the improvement of the sound quality can be achieved by this method with advantage of time-saving and cost effective and without modifying the physical structure. Hence, the tendency of better solution will be found. To convert the sound quality problem identification into physical problem identification, the noise sources identification experiment is carried out by a single run method to quantify the noise sources which mainly contribute to the critical frequency of the interior noise spectrum. As a consequence, the main noise sources are identified as fuel cell auxiliary system.