Regarding the suspension system as a substructure ( subsystem ) appended on the car body , and considering the vibration transfer effect of the suspension system for the displacement excitation induced by unevenness of road surface , an explicit formula about the quantitative relationship between the sound pressure of low frequency interior noise and some of the suspension characteristic parameters of a vehicle , i . e . , the stiffness , the damping , the under suspension mass of suspension system , and the radial stiffness , the radial damping of tire , is deduced based on the dynamic substructure modification method for structure - acoustic coupling analysis of an automobile ' s passenger compartment 摘要基于车身乘坐室声振耦合的动态子结构修改方法，将汽车悬架系统视为附加于车身上的子结构（子系统） ，并结合悬架系统对路面不平度位移激励的振动传递效应，揭示出车内低频噪声的声压值与悬架系统刚度、阻尼、非悬挂质量以及轮胎径向刚度、径向阻尼间的直接定量关系。
The crank - set of motor is a special rotate machine , in which the inertia combined - force caused by running crank will tremble the whole automobile along with rack . therefore , it has practical meaning to locate the inertia combined - force and eliminating its influence on whole system , which can reduce the uncomfortable feeling of driver , also promote entire performance 发动机曲柄连杆是一种特殊的旋转机械，其工作时产生的惯性力的合力会使发动机工作时产生振动，这个振动传递到机架上，引起整车的振动，从而使驾驶者感到不适，同时对整车性能产生不利影响，因此，找出并消除这个惯性力的合力对于提高车辆的整体性能有着重要意义。
Trough the test of static pressure , impact and vibration to several kind of different cushions packing material , obtains the performance curves of cushion and vibration of different cushion packing material , and carries on the contrast analysis to these curves , establishes the database , provides the basis for the cushion packing design and the research 摘要通过对几种不同的缓冲包装材料进行静态、动态压缩及振动传递率试验，得到了它们的缓冲和振动性能曲线，并对这些曲线进行了对比分析，建立了相应的数据库，为缓冲包装的设计和研究提供了理论依据。
