Abstract
Vibration isolation is an effective method to mitigate unwanted disturbances arising from dynamic loading conditions. With smart materials as suitable substitutes, the conventional passive isolators have attained attributes of semi-active as well as the active control system. In the present study, the non-homogenous field-dependent isolation capabilities of the magnetorheological elastomer are explored under torsional vibrations. Torsional natural frequency was measured using the serial arrangement of accelerometers. Novel methods are introduced to evaluate the torsional stiffness variations of the isolator for a semi-definite and a motor-coupled rotor system. For the semi-definite system, the isolation effect was studied using the frequency response functions from the modal analysis. The speed-dependent variations for motor-coupled rotor system were assessed using the shift in frequency amplitudes from torque transducers. Finite element method magnetics was used to study the variations in the non-homogenous magnetic field across the elastomer. The response functions for the semi-definite rotor system reveal a shift in the frequency in the effect of the magnetic field. Speed-dependent variations in the frequency domain indicate an increment of 9% in the resonant frequency of the system.
摘要
隔振是一种减少在动态加载条件不必要干扰的有效方法. 以智能材料作为合适的替代品, 传统的无源隔离器具有主动控制和半主动控制的特点. 在本研究中, 探讨了磁流变弹性体在扭转振动下的非均匀场相关隔离能力, 利用加速度计的串联方式测量扭转固有频率, 介绍了一种新的方法来评估半定转子系统和电机耦合转子系统的隔振器的扭转刚度变化. 利用模态分析中的频响函数, 研究了半定系统的隔振效果. 利用转矩传感器的频率幅值的位移来评估电机耦合转子系统的速度相关变化. 用有限元方法研究了非均匀磁场在弹性体表面的变化. 半定转子系统的响应函数揭示了磁场作用下频率的变化. 频率域的速度相关变化表明系统的共振频率增加了 9%.
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Acknowledgements
The authors acknowledge the support from SOLVE: The Virtual Lab @ NITK (Grant number: No.F.16-35/2009-DL, Ministry of Human Resources Development) and experimental facility provided by Centre for System Design (CSD): A Centre of Excellence (http://csd.nitk.ac.in/) at National Institute of Technology Karnataka, India. The authors would also wish to thank Mr Umanath Poojary, Senior Research Fellow, CSD, for his invaluable inputs.
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Praveen, S.K., Kuchibhatla, S.A.R., Singh, A.K. et al. Performance of magnetorheological elastomer based torsional vibration isolation system for dynamic loading conditions. J. Cent. South Univ. 27, 144–154 (2020). https://doi.org/10.1007/s11771-020-4284-3
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DOI: https://doi.org/10.1007/s11771-020-4284-3
Key words
- torsional vibration isolation
- semi-definite system
- magnetorheological elastomer
- speed-dependent isolation