Hazardous failures of engineering structures can be prevented by implementing passive vibration absorbers. Although tuned mass dampers (TMD) are used most frequently in practice, nonlinear energy sinks (NES) offer a broader frequency performance due to their targeted energy transfer (TET) mechanisms. However, this behavior occurs only in a limited amplitude range. In this work, the vibration suppression of novel monostable and bistable magnetic rotary nonlinear energy sinks (MRNESs) are studied numerically and experimentally over a range of excitation magnitudes for impulse and harmonic excitation. The MRNESs are tuned to achieve hybrid TMD and NES-like behavior. The medley of in-well, cross-well, and rotational TET mechanisms responsible for their performance are related to their underlying Hamiltonian systems and lower boundaries of chaos. For impulse excitation, rotational, subharmonic, and nonlinear beat responses lead to efficient energy dissipation. For harmonic excitation, the MRNEs’ frequency responses can resemble a TMDs’ or exhibit chaotic-like cross-well and rotational strongly modulated responses. Consequently, MRNESs can overcome the shortcomings of many NESs, which are inefficient at low excitation magnitudes, while also outperforming linear TMDs when the systems’ parameters are detuned at large excitation magnitudes, for both impulse and harmonic excitation. The MRNESs’ TET mechanisms and efficient performance over a broad range of excitation magnitudes were validated experimentally for both types of excitation. The MRNES may be more viable for practical use than other hybrid NESs since it is compact, highly customizable, and does not rely on impacts or complicated spring arrangements for its non-linearity.

中文翻译：

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旋转磁性非线性能量阱的多面振动吸收


通过实施被动减振器，可以防止工程结构的危险故障。尽管调谐质量阻尼器 （TMD） 在实践中使用最频繁，但非线性能量阱 （NES） 由于其目标能量转移 （TET） 机制而提供更宽的频率性能。但是，此行为仅发生在有限的振幅范围内。在这项工作中，在脉冲和谐波激励的激励幅度范围内，对新型单稳态和双稳态磁性旋转非线性能量阱 （MRNES） 的振动抑制进行了数值和实验研究。MRNES 经过调整以实现 TMD 和 NES 样混合行为。负责其性能的井内、交叉井和旋转 TET 机制的混合与其底层哈密顿系统和混沌下限有关。对于脉冲激励，旋转、次谐波和非线性拍频响应可实现高效的能量耗散。对于谐波激发，MRNE 的频率响应可能类似于 TMD 的频率响应，或者表现出类似混沌的交叉井和旋转强调制响应。因此，MRNES 可以克服许多 NES 的缺点，即在低激发幅度下效率低下，同时当系统参数在大激发幅度下失谐时，脉冲和谐波激发的性能也优于线性 TMD。对于两种类型的激发，MRNES 的 TET 机制和在广泛的激发幅度范围内的高效性能都经过了实验验证。MRNES 可能比其他混合 NES 更适用于实际使用，因为它结构紧凑、高度可定制，并且不依赖于冲击或复杂的弹簧布置来实现其非线性。