基于LabVIEW的发动机振动测试系统的开发

汽车发动机产生故障时,其关联部位的振动量将会有不同程度的增大,通过检测振动量可诊断发动机状态与故障信息.传统的检测仪器由于投资大、检测准确性及可靠性较差等缺陷,在实际应用中受到很大的制约.针对这种检测现状,基于先进的虚拟仪器技术,借助于传感器、信号调理器和数据采集卡等基本硬件,应用NI LabVIEW软件编制了振动数据采集与处理程序,研发了发动机振动测试系统,并将其应用于发动机缸盖螺栓拧紧力矩与机体振动量关系的振动测试中,得到了机体振动量较小时对应的螺栓最佳拧紧力矩范围,并与发动机生产厂家推荐的数据相吻合,从而验证了振动测试系统的可行性和正确性,为发动机振动测试提供了一种新的方法与途径,也为其他类似的振动测试与相关分析提供了参考.

The Development of the Engine Vibration Test System Based on Labview

When the automobile engine runs wrong,the vibration amount of its connection parts will have the aggrandizement of different degree,By means of inspecting the vibration amount of the engine on running,its appearance and fault could be diagnosed.Because of traditional inspection instrument having the great investment and worse examination accuracy and credibility etc,it would be very restricted in actually apply.Aimming at present inspection condition,basing on the advanced virtual instrument technique and depending on the basic hardware of the sensors,signal condition manager and the data sample card,we applied the software of NI LabVIEW to programme acquisition and process procedure of the vibration data and developed the engine vibration test system,when applying the system in studding the relationship between tightening torque of bolts set on cylinder cap and vibration of engine body,the optimum range of bolts tightening torque corresponding to lower engine body vibration amount was found out,the tightening torque was tally with the one that engine manufacturer recommended.thus the feasibility and validity of the vibration test system was verified,this would provide a new method and approach for engine vibration test,and also provide the reference for similar test and correlative analysis of other machines.