Abstract This paper presents a nonlinear multi-modal energy harvester and vibration absorber (EHVA) for both energy harvesting and vibration suppressing in low-medium frequency band. Two different methods are applied to broaden the effective bandwidth. Not only the multi-modal shapes of EHVA are designed, but also the hysteresis property of nonlinear softening spring is realized by a novel permanent magnets structure proposed in this paper. The simulation results illustrate that the magnetic repelling force reduces significantly when the oscillator magnet is close to the stator magnet, causing the nonlinearity of the softening spring. The linear and nonlinear stiffness parameters, natural frequencies and damping values of the oscillator are experimentally identified. The analytical model of flux density in the space is established to obtain the induced voltage. Then, the identified parameters are used to obtain the analytical nonlinear frequency response. It indicates that the effective bandwidth is widened by the nonlinear softening spring. The experiments demonstrate that the designed EHVA can help attenuate the vibration more than 15 dB and harvest 47 mV maximum voltage in the bandwidth from 11 Hz to 24 Hz. Comparing with the harvester using hard spring, the size of EHVA proposed in this paper can be decreased theoretically.

中文翻译：

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使用磁软化弹簧的非线性多模态能量收集器和减振器

摘要 本文提出了一种非线性多模态能量收集器和振动吸收器（EHVA），用于中低频段的能量收集和振动抑制。应用两种不同的方法来加宽有效带宽。不仅设计了 EHVA 的多模态形状，而且通过本文提出的新型永磁体结构实现了非线性软化弹簧的磁滞特性。仿真结果表明，当振荡器磁铁靠近定子磁铁时，磁排斥力显着降低，导致软化弹簧的非线性。振荡器的线性和非线性刚度参数、固有频率和阻尼值是通过实验确定的。建立空间磁通密度解析模型，得到感应电压。然后，识别的参数用于获得解析非线性频率响应。这表明有效带宽被非线性软化弹簧加宽。实验表明，设计的 EHVA 可以帮助将振动衰减 15 dB 以上，并在 11 Hz 至 24 Hz 的带宽内获得 47 mV 的最大电压。与使用硬弹簧的收割机相比，本文提出的 EHVA 的尺寸在理论上可以减小。实验表明，设计的 EHVA 可以帮助将振动衰减 15 dB 以上，并在 11 Hz 至 24 Hz 的带宽内获得 47 mV 的最大电压。与使用硬弹簧的收割机相比，本文提出的 EHVA 的尺寸在理论上可以减小。实验表明，设计的 EHVA 可以帮助将振动衰减 15 dB 以上，并在 11 Hz 至 24 Hz 的带宽内获得 47 mV 的最大电压。与使用硬弹簧的收割机相比，本文提出的 EHVA 的尺寸在理论上可以减小。