车用扭振减振器性能检测试验台

Torsional vibration test system based on virtual instrument

为解决车用扭振减振器与发动机匹配实验危险系数较高的问题,基于虚拟仪器技术开发了一套车用扭振减振器性能检测试验台。试验台控制系统模拟车用发动机产生扭转振动,通过变频器及变频电机实现了扭振激励的转速、频率及振幅可调。信号采集系统由多路磁电传感器及NI-DAQ采集设备组成。试验台采用高频记数原理,记录测速齿盘旋转过程中每一齿对应的脉冲个数,根据脉冲个数计算瞬时转速及角速度波动,对多路传感器信号初始时刻进行标定调整,得到相对扭角参数。整个系统的信号采集控制及数据计算处理由基于图形化编程语言LabVIEW开发的应用程序完成。对加装某减振器后的试验台进行了试验,其结果表明该试验系统能够进行较精确的扭振减振器性能匹配测试,可有效降低扭振减振器实车检测的危险,提高检测效率。

In order to solve the high risk problem when doing match test between torsional vibration damper and real engine,a new torsional vibration damper test system was developed based on virtual instrument.The control part of the system simulated torsional vibration in automobile,the rotate speed,frequency and amplitude of the torsional vibration exciting device can be changed through frequency converter and variable frequency motor.The signal acquisition part was composed of multiply sensor and NI-DAQ equipment.A high frequency crystal oscillator was employed to produce pulses,the counters recorded the pulses of fluted disc,according to the pulse number,the rotate speed,torsinoal angel can be figured out.Both the control part and calculate part were finished by software based on LabVIEW.The experiment was carried out with some torsional vibration damper.The experiment result proves that the system can test the match performance between the damper and the engine,and this will reduce the danger of testing on real cars and improve the testing efficiency.