Data analysis and processing for Maglev vibration test systems

摘要

Maglev vibration measurement system model was designed and the kinetic equation of Maglev vibration test system was built. The vibration equation shows that the relative displacement of the variable between the magnetic levitation ball and the instrument housing constitute a second order linear differential equations. By amplitude-frequency characteristics and phase-frequency characteristics analysis confirmed that when the frequency of the vibration signal measured is higher the relative displacement between the magnetic levitation ball and instrument housing is inversely related to vibration signals measured. Theory confirmed that maglev vibration measurement system can achieve absolute vibration measurement without absolute reference point. In order to verify the correctness of the theory some standard vibration signals were generated by standard vibration platform. The vibration waveforms generated by vibration platform were measured by magnetic levitation vibration measurement system. Test shows that Maglev vibration test system can achieve absolute vibration measurements. The frequency-domain power spectrum signals of these vibration waveforms measured were obtained by FFT transform. In order to eliminate the influence of high-frequency interference signals, in the power spectrum, the high frequency component is removed. Then the vibration signals closer to vibration platform are obtained by FFT inverse transform. Maglev vibration measurement system has high sensitivity and eliminates mechanical clearance error, etc. This method is a new method of vibration measurement. Through data analysis and processing, it can reduce the distortion. This method lays the foundation for the practical application of the method.