Torsional vibration test system based on virtual instrument

LI Jie1， YU Xiao-li1， ZHANG Peng-wei1，2， LIU Hai-jun1，2
（1. The Department of Energy Engineering， Zhejiang University， Hangzhou 310027， China；
2. Weichai Power Co.Ltd.，Weifang 261001，China）

Abstract： 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.
Key words： torsional vibration damper； virtual instrument； LabVIEW； performance test bench