System for gear online fault diagnosis based on DSP and envelope demodulation method

A online fault diagnosis system is designed using TI´s digital signal processor DSP-TMS320F2812 as the core processor. The system can run independently without the upper monitor, its hardware is built by the various peripheral modules of F2812, which includes the acquisition of vibration signal, rotating speed signal, digital signal, and communicates with the upper monitor by RS-232 protocol and CAN (Controller Area Network) bus. According to the common faults occured in gears, the digital filter algorithm, time domain statistical index, power spectrum and envelope demodulation spectrum are used in data processing to extract fault feature. It can get the type, location and extent of the fault by the fault feature vector. Tests show that the system can realize on-line monitoring for a long time, and can correctly identify the faults.