Study on the dynamic characteristics of electro-hydraulic resonant fatigue test rig

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Journal of Vibration and Shock ›› 2013, Vol. 32 ›› Issue (9) : 95-99.

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Study on the dynamic characteristics of electro-hydraulic resonant fatigue test rig

BAI Ji-ping1,2, RUAN Jian1, JIA Wen-ang1

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Abstract

Electro-hydraulic resonant fatigue test rig is mainly composed of an asymmetric cylinder and a two-way three-position two-dimensional high rotational valve (Abbr. 2D valve). With this, the change of natural frequency of the electro-hydraulic fatigue test rig can be achieved by changing the initial length of the non-rod chamber of the asymmetric cylinder. Thanks to its broad bandwidth and high-frequency, 2D valve outperforms conventional electro-hydraulic servo valves which are constrained by bandwidth limit. The system’s frequency and amplitude can be controlled by changing the rotation speed of the valve spool and axial opening size. The paper establishes mathematical and simulation models for the variable resonant electro-hydraulic fatigue test rig which uses 2D valve control technology. Simulation and experimental studies of the test rig’s resonant working condition are also conducted. The results show that, when the fatigue test rig is working at resonant condition, the output waveform of the displacement (load force) and the exciting force is better, and the energy consumption is lower.

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electro-hydraulic / fatigue test rig / resonant / dynamic characteristics

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BAI Ji-ping;RUAN Jian;JIA Wen-ang. Study on the dynamic characteristics of electro-hydraulic resonant fatigue test rig[J]. Journal of Vibration and Shock, 2013, 32(9): 95-99