基于两种不同内装结构高速车厢(X车和Y车)的大量现场对比试验，对现役国产高速动车组表现出的X车内异常振动、噪声问题进行详细调查研究。试验中考虑两种车厢同样的运营速度、相近外部气动激扰和相近的轨道激扰条件，同时两种被试验车辆在同列车中相邻编组，同为动车。对该型号多列动车组的两种车厢振动、噪声特性及磨耗轮进行长期跟踪测试，重点关注车内异响特性及车轮非圆化对其的影响，同时得到不同运行里程下车轮非圆化及车内噪声水平发展规律。试验研究表明，高速动车组的X车相比于Y车，存在异常振动及噪声现象，这种异常振动和噪声对高阶车轮非圆化敏感，同时X车异常振动、噪声还与其特殊车内结构布置有关。

Based on field tests of high-speed coaches X and Y, the characteristics and mechanisms of the abnormal interior noise and vibration occurred in the type X coach are investigated. In the field tests, the test coaches are running at the same operation speed and similar exterior air turbulence and track excitation. The two types of coaches are contiguously marshaled in the adjacent positions of a same train, both of which are motors. A long-term monitoring and analysis of the wheel wear status and the interior vibration-noise of coaches X and Y marshaled in trains are conducted focusing on the relationship between the interior abnormal noise and the non-circular wear of wheels. The test results shows that the type X coach generates higher abnormal vibration and noise than type Y coach. The abnormal vibration and noise are sensitive to the high-order polygonal wear of the coach wheels. It is also found that the higher vibration and noise on type X coach is related to its special interior structural.