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| Design and analysis of quasi-zero stiffness torsional vibration isolator adapting to load changes |
| ZHANG Chunsong1, LI Xueyong1,2,3, ZHANG Shuo1, XU Dingmin1 |
1.School of Mechanical Engineering, Shandong University, Jinan 250061, China;
2．MOE Key Lab of High Efficiency and Clean Mechanical Manufacture, Shandong University, Jinan 250061, China;
3.National Experimental Teaching Demonstration Center of Mechanical Engineering, Shandong University, Jinan 250061, China |
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Abstract A new torsion Quasi-Zero-Stiffness vibration isolator is proposed. It can adjust the positive stiffness to adapt to the load change, and adjust the negative stiffness synchronously to make the isolator always work in the quasi-zero-stiffness state. The vibration isolator is composed of a torsion magnetic spring (TMS) and leaf springs. The TMS is composed of inner and outer ring magnets magnetized radially. Adjusting the relative axial positions of the inner and outer rings can change the negative stiffness. The torque calculation model of the TMS is obtained using the equivalent magnetic charge method. The influences of spring parameters on the stiffness characteristics were analyzed. The dynamic model of the system was established and the dynamic response of the isolator was solved using harmonic balance method. The influence of excitation amplitude and damping ratio on the isolation performance of the isolator was analyzed. The results show that the isolator has good isolation effect under different loads. Vibration isolator prototype was manufactured, the experiment of torque and angular displacement curve is in good agreement with theoretical calculation results. The experimental results show that the isolator can realize the synchronous adjustment of positive and negative stiffness by adjusting the relative axial position of TMS and the effective length of spring.
Key words: torsion vibration isolation; quasi-zero-stiffness; variable load; nonlinear analysis
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Received: 11 August 2021
Published: 15 December 2022
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