Experimental and analysis on output waveform stability of dual-valve excitation system during vibration broaching

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (20) : 84-90.

MENG Zhen1， NI Jing1， WU Chuan-yu2

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Abstract

In order to investigate the output amplitude stability of excitation system during vibration broaching, a transfer function of dual-valve excitation system was established by considering the flow coupled linear model and the broaching force model. And the time domain response function of output force and displacement was obtained based on the transfer function. Then, the simulate results of aforementioned function was calculated by MATLAB, including Bode diagram and response curve of time domain. At last, the experimental data were compared with simulation results, which obtained from the novel vibration broaching platform. The results show that the frequency of the excitation signal affects the balance position and the amplitude of output waveform. The higher the frequency of the signal, the easier the output waveform can be adjusted. The oscillation frequency of the output waveform is mainly affected by the broaching force. The greater the force, the more unstable the output waveform was. Therefore, to make the output waveform more stable, the ratio of vibration cylinder bore and stroke should be improved, which could increase the response frequency. On the other hand, the energy storage device and flow type valve should be added, which could balance the pressure ratio of vibration cylinder cavity.

Key words

vibration broaching / electrical-hydraulic excitation / Bode diagram / waveform stability

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MENG Zhen1， NI Jing1， WU Chuan-yu2. Experimental and analysis on output waveform stability of dual-valve excitation system during vibration broaching[J]. Journal of Vibration and Shock, 2017, 36(20): 84-90

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