基于LabVIEW的高速机床主轴振动信号提取方法

Vibration Signal Processing Method of High Speed Machine Tool Spindle Based on LabVIEW

目的为了提高高速机床主轴振动信号的测试精度,开发基于虚拟仪器的振动测试系统.方法笔者提出一种基于时域平均和FIR滤波的自动跟踪相关滤波振幅提取算法,并基于LabVIEW虚拟仪器编写了算法程序,为了验证算法的正确性,进行了仿真和实验分析;并将笔者算法与常规的自动跟踪相关滤波提取算法进行对比.结果仿真和试验表明笔者算法测得的幅值精度控制在97%以上,且较之常规自动跟踪相关滤波法,振幅提取精度提高27%以上.结论与常规自动跟踪相关滤波法相比,笔者算法具有更高的幅值提取精度,且在不同主轴转速下提取振动幅值精度稳定,能够满足不同转速下的幅值提取要求.

In order to improve the vibration signal testing accuracy of the high-speed machine tool spindle,a vibration measurement system which based on virtual instrument was developed. According to the principle of relevant filter with automatic following,a vibration signal extraction arithmetic which based on time domain averaging and FIR filtering was proposed in this paper. The algorithm program was written on the LabVIEW virtual instrument. The correctness of the arithmetic was verified by simulation test and experiment. The writer algorithm was compared with the conventional relevant filter with automatic following extraction algorithm. The result of simulation test and experiment shows that the amplitude extraction precision of the writer algorithm is over 97%and compared with the conventional relevant filter with automatic following algorithm,the amplitude extraction accuracy improves by over 27%. Compared with the conventional relevant filter with automatic following algorithm,the writer algorithm has higher amplitude extraction accuracy and the measurement accuracy of amplitude is stable at different rotational speeds. It can satisfy the request of amplitude extraction at different speeds.