中文摘要：

为研究高速列车运行时结构表面产生的强声压对乘坐环境和结构破坏的影响,针对某型高速列车建立车厢声-振耦合有限元模型,研究车厢的结构模态、室内声场模态及结构-声场耦合系统模态;针对其所处特殊动态环境,计算耦合系统谐响应,考察其振动特点及室内噪声分布情况.计算结果表明,车厢结构低阶模态显示出良好的整体性,在较高频段内以局部模态为主;空腔声场各阶模态振型对称,耦合系统模态大部分与结构模态相似;车厢结构的振动以车头、车顶、侧墙为主,其中车头鼻锥处、车底及车顶局部位移响应较大,车头鼻锥及其车厢壁板处声压响应较大.

英文摘要：

As to the issues that the strong acoustic pressure which is generated on structure surface by running high speed train would lead to a series of problems such as deterioration of ride environment and structure damage,a finite element model of acoustic-vibration coupling is established for a high speed train to study the structure modes of carriages,interior acoustic field modes and structure-acoustic coupling system modes;for the special dynamic environment,the harmonic response of coupling system is calculated to study the vibration characteristics and interior noise distribution.The results show that,the structural modes appear a good wholeness at lower frequencies and mostly appear local modes at higher frequencies;the vibration shapes of cavity acoustic fields are symmetrical and the coupling system modes are same as the structural modes mostly;the vibration of carriage structure mainly occurs at train head,roof and wall;the displacement responses are bigger at the nose cone,the bottom and the roof,and the sound pressures are greater at the head and the wall.