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针对转子高速动平衡过程转速高、振动问题突出以及相位波动等特点,提出了一种高速动平衡的数据采集与处理方法,运用多线程技术准确测量转速信号并且同步采集振动信号。根据转速变化情况迅速切换暂态与稳态,减少状态切换时间,方便测试人员操作,提高试车的效率。以转速脉冲信号为基准,对振动信号进行整周期截取与插值处理,并对平衡记录进行多次平均,解决转速波动时振动幅值与相位的跳动问题。建立试验转子模型,进行动力学特性的计算与试验。结果表明:一阶临界转速计算值与实测值相对误差不超过1%,不平衡响应的相对误差不超过10%。仿真计算与试验结果相吻合,这对提高相位测量的准确度和稳定性,具有一定的工程应用价值。
Aiming at the characteristics of high speed dynamic balancing process, prominent vibration and phase fluctuation, a new method of data acquisition and processing for high speed dynamic balancing is proposed. The multi-thread technology is used to accurately measure the rotational speed signal and synchronously acquire the vibration signal. According to the change of speed, the transient and steady state can be switched quickly, the state switching time can be reduced, the operation of the tester can be facilitated, and the efficiency of the test run can be improved. Taking the speed pulse signal as the reference, the whole period of the vibration signal is intercepted and interpolated, and the average value of the balance record is used to solve the problem of the vibration amplitude and phase jitter during the rotation speed fluctuation. The experimental rotor model is established to calculate and test the dynamic characteristics. The results show that the relative error between the calculated value of first order critical speed and the measured value does not exceed 1% and the relative error of unbalanced response does not exceed 10%. The simulation calculation is in good agreement with the experimental result, which has a certain engineering application value for improving the accuracy and stability of phase measurement.