We also give the effect results of running in different line and using different operating method in train longitudinal dynamics performance . it can be made use of by railway different department 评价了现有缓冲器的纵向动力学性能，分析采用不同制动阀和闸瓦的利弊、线路状况及操纵方式对列车纵向动力学性能的影响，以供有关部门参考。
According to above two calculation method , different type drawing piece results are obtained , automobile install pull valve for example , is used by this calculation method , it is very useful to practice press production . ideal workpiece is on assemble obtained 利用上述两种计算方法得到的不同类型的拉深结果，应用于实际冲压生产，如汽车制动阀安装板，获得了较理想的装配要求。
Study on the pressure balance time affected by the different input signal will have very important meaning in theory and practice for the research and development on the performance test system of automobile brake valves . at the same time , it makes instructing reference to develop other test systems 不同输入信号对压力平衡时间的影响的研究，对汽车气制动阀类件性能测试系统的开发只有重要的理论意义，同时也为其它测试系统的研制提供了有参考价值的实践依据。
In this paper , through stress analysis of region about conical and spherical parts during drawing , a calculating formula of maximum tangential compressive stess in unsupported wall region is deduced . and this is condition of causing internal wrinkle . then on the premise to guarantee not breaking workpiece , a critical calculating formula is presented 通过圆筒形及盒形件拉深前后网格变化分析，并确定变形区和非变形区，由此得到不规则盒形件毛坯展开形状由不变形区和参与变形拉深线组成，并用此方法计算出汽车制动阀安装板的毛坯形状和尺寸，在试模时一次即获得成功，具有一定的实用价值。
This thesis regards virtual instrument technology of pc - daq bus as the theoretical foundation , use the similar principle simulation real car operating mode , pneumatic to control and combine together with electro - mechanical integration technology , develop and manufacture this set to apply the pneumatic brake valve spare part performance tests the system synthetically 本论文以pc - daq总线的虚拟仪器技术为理论基础，应用相似原理模拟，实车工况，将气动控制与机电一体化技术相结合，开发研制出了这套气制动阀类零部件性能综合测试系统。
