Theory,Experiment and Numerical Calculation of Vibration Superposition

The problem of vibration superposition was discussed.Beat phenomenon and Lissa-jous figure were investigated theoretically and experimentally,at the same time they were simulated by Matlab software.The phase difference and the difference of frequency of signal's influence on Lissa-jous figure were analyzed in theory and by numerical calculation method,and the reason of rotation of Lissa-jous figure was explained.