一种新型磨床振动频率测量系统设计

A new kind of vibration frequency measure system of grinder

摘要:

设计了一种新型的磨床振动频率测量系统,采用MMA8451Q微加速度计作为测量元件,使用高性能低功耗单片机MSP430F5529作为控制核心。系统用滑动平均滤波算法对信号进行了降噪平滑处理,计算出振动数据的“虚拟过零点”,以此为基础计算出振动的频率。通过在标准振动源上的标定实验验证了滤波算法的有效性和频率测量的准确性,误差在0.2Hz以内,引用误差为0.25%。最后在曲轴磨床上进行了实际测量实验,得出测量结果和理论计算结果是吻合的,证明了系统的可行性。

Abstract:

Designed a new kind of frequency measure system of grinder based on micro accelerator MMA8451Q and the high performance micro controller unit MSP430F5529. Begin with the sliding average filtering algorithm, the signal was disposed smoothly. The “virtual zero passing point” was calculated, and it was used to calculate the frequency of the vibration. According to the demarcate experiments on the vibration source, the validity and veracity of sliding average filtering algorithm and frequency measurement were proved. The max error was less than 0.2Hz, fiducial error was 0.25%. The practical measure experiment was done on the bent axle grinder, the result show that it was fit with the theoretical arithmetic result, and the system was feasible.