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<p>Given the performance reduction caused by inherent nonlinearity in classic quasi-zero-stiffness vibration isolators (QZS-VIs) and the structural complexity in some enhanced variants, this work converts the additional load in the variants into a multifunctional element with anti-nonlinear dynamic behavior and energy harvesting. A series of hybrid QZS-VIs are developed by integrating spring-rod QZS-VIs with electromagnetic transducers in varied configurations, achieving distinct electromechanical stiffness (S), damping (D), inerter (I) properties, and energy harvesting capabilities, collectively termed QZS-ESDIEH-VIs. The QZS-VIs with nonlinear inerter (QZS-NI-VIs), which are crucial comparators to QZS-ESDIEH-VIs, replace electromagnetic transducers with equivalent mass blocks. The QZS-ESDIEH-VIs and QZS-NI-VIs are modeled as a consolidated coupled electromechanical dynamic equation, which is solved via harmonic balance and arc-length methods. The solutions are validated by Runge-Kutta method, and the stability criteria are established. The non-dimensional formulations for the average output energy and the energy harvesting efficiency are obtained. The investigation of the static and dynamic characteristics of various isolators reveals the superiority of the QZS-ESDIEH-VI, allowing for the adjustment of its dynamic behavior and energy harvesting. The results demonstrate that integrating electromagnetic transducers enhances the low-frequency vibration attenuation and nonlinearity suppression of the QZS-ESDIEH-VIs when compared to the corresponding QZS-NI-VIs. Among configurations, the improved Type I QZS-ESDIEH-VI performs best in low-frequency isolation, lowering peak transmissibility by 47.7% and isolation beginning frequency by 30.1%. Type II has the best energy harvesting efficiency, raising the maximum average power by 87.1%. Furthermore, Type I has better robustness, with its system response being the least vulnerable to disturbances across several excitations. This work outlines design objectives for combination of vibration attenuation and energy harvesting.</p>

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Incorporating electromagnetic transducers in quasi-zero stiffness isolators for nonlinearity mitigation and energy harvesting

  • 期刊论文

  • 发表日期：

    2025年4月6日

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  • Junjie Yuan,
  • Guoyong Jin,
  • Tiangui Ye,
  • Zexi Sun,
  • Jinlin Bai

摘要

Given the performance reduction caused by inherent nonlinearity in classic quasi-zero-stiffness vibration isolators (QZS-VIs) and the structural complexity in some enhanced variants, this work converts the additional load in the variants into a multifunctional element with anti-nonlinear dynamic behavior and energy harvesting. A series of hybrid QZS-VIs are developed by integrating spring-rod QZS-VIs with electromagnetic transducers in varied configurations, achieving distinct electromechanical stiffness (S), damping (D), inerter (I) properties, and energy harvesting capabilities, collectively termed QZS-ESDIEH-VIs. The QZS-VIs with nonlinear inerter (QZS-NI-VIs), which are crucial comparators to QZS-ESDIEH-VIs, replace electromagnetic transducers with equivalent mass blocks. The QZS-ESDIEH-VIs and QZS-NI-VIs are modeled as a consolidated coupled electromechanical dynamic equation, which is solved via harmonic balance and arc-length methods. The solutions are validated by Runge-Kutta method, and the stability criteria are established. The non-dimensional formulations for the average output energy and the energy harvesting efficiency are obtained. The investigation of the static and dynamic characteristics of various isolators reveals the superiority of the QZS-ESDIEH-VI, allowing for the adjustment of its dynamic behavior and energy harvesting. The results demonstrate that integrating electromagnetic transducers enhances the low-frequency vibration attenuation and nonlinearity suppression of the QZS-ESDIEH-VIs when compared to the corresponding QZS-NI-VIs. Among configurations, the improved Type I QZS-ESDIEH-VI performs best in low-frequency isolation, lowering peak transmissibility by 47.7% and isolation beginning frequency by 30.1%. Type II has the best energy harvesting efficiency, raising the maximum average power by 87.1%. Furthermore, Type I has better robustness, with its system response being the least vulnerable to disturbances across several excitations. This work outlines design objectives for combination of vibration attenuation and energy harvesting.