一个关于FFT应用的例子，This program calculates the Waterfall FFT of a time history，by Tom Irvine -With regard to the application of a FFT example, This program calculates the Waterfall FFT of a time history, by Tom Irvine

轴系测试程序，多通道输入输出，实现时域、频域、轴心轨迹、瀑布图等功能。-Shafting test program, multi-channel input and output, to achieve time domain, frequency domain, orbit, waterfall and other functions.