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| Dynamic Modeling and Experiment of A Hybrid Passive/Active Stewart Vibration Isolation Platform |
| Xie Xiling1,2, Wang Chaoxin1,2, Chen Yanhao1,2, Zhang Zhiyi1,2 |
1. Institute of Vibration & Noise, Shanghai Jiaotong University, Shanghai 200240;
2. State Key Laboratory of Mechanical System and Vibration, Shanghai Jiaotong University, Shanghai 200240 |
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Abstract A Stewart platform of cubic configuration was presented for hybrid passive/active vibration isolation. In the platform, the six struts are connected with the base and the payload through spherical joints lubricated by graphite, and each strut comprises a voice coil actuator and a force transducer. The Stewart platform was treated as an elastic system and an FRF (frequency response function) model was built by using the FRF-based substructure synthesis method. This model was validated by the finite element method and used in subsequent simulation. Vibration isolation with embedded feedback was analyzed and the effectiveness was evaluated. Experiments were also conducted to verify the hybrid passive/active vibration isolation performance. The results demonstrated that the passive isolation has approximately -36dB/dec attenuation rate in the frequency range of 30-200Hz, and the active isolation can achieve a maximum attenuation of 20dB in the frequency range of 3-100Hz, moreover, the RMS values of dynamic forces in the struts were reduced by about 75-80% within 200Hz.
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Received: 30 March 2016
Published: 15 June 2017
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