Development of arbitrary waveform torsional vibration signal generator

In order to more accurately evaluate or calibrate the electronic torsional vibration test analyzer and analysis method, a torsional vibration signal generator is developed in the present study. The developed device generates a tooth pulse interval sequence based on the inverse solution of the shaft torsional equation. Moreover, a single-frequency signal, inter-harmonic signal, time-varying harmonic signal, and noise-containing time-varying inter-harmonic signal are simulated. The pulse width modulation module of TMS320F28335 is used to generate the instantaneous speed gear pulse signal, while the external expanded digital to analog conversion module is utilized to generate the corresponding speed analog signal. The hardware structure of the proposed generator has remarkable advantages, including simple structure, low-cost operation and easy to use interface. Moreover, it can be applied to evaluate or calibrate the torsional vibration test analyzer and analytical methods.