Labview串口检测振动信号并声音报警电路，比较简单~以便交流学习-For learning and communicating!

基于EMD-ARmodel和支持向量基的非线性振动信号的文章，学习非线性的同学可以看下，外文的来自I-Feature Extraction & Application of Engineering Non-stationary Signals Based on EMD-AR Model and SVD

超声波发生器内部结构有两个压电晶片和一个共振板。当它的两极外加脉冲信号，其频率等于压电晶片的固有振荡频时，压电晶片将会发生共振，并带动共振板振动，便产生超声波。-Ultrasonic generator internal structure has two piezoelectric chip and a sounding board. When it is applied bipolar pulse signal having a frequency equal to the natural