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首页> 外文期刊>International journal of non-linear mechanics >Analysis, design and experiment of continuous isolation structure with Local Quasi-Zero-Stiffness property by magnetic interaction
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Analysis, design and experiment of continuous isolation structure with Local Quasi-Zero-Stiffness property by magnetic interaction

机译：具有局部准零刚度特性的电磁相互作用连续隔震结构的分析，设计与实验

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摘要

In this study, magnetic interaction is applied to a continuous structure as local negative-stiffness components to improve the vibration isolation performances and to extend the vibration isolation band. According to the theory of electromagnetic fields, the mechanical model of interaction force is established. This model is used to discover that the magnetic interaction can induce the negative stiffness property locally using appropriate structural parameters. Because different structural parameters of the magnets can increase the negative stiffness strength with different effects, the parameters of the continuous beam and magnets are adjusted for the design of accurate zero stiffness property locally. Then, the relationship between structural parameters and effective isolation bandwidth is established by deriving the solution of steady state around zero equilibrium. As the nonlinearity and zero-stiffness property only occur locally around zero equilibrium and the system displays the positive-stiffness property for large vibration amplitudes, the effective isolation band is significantly extended, and the amplitude-frequency curve is similar to the linear system at resonance. The relevant experiments demonstrate the remarkable tuning characteristic of structural parameters of magnets on the isolation features, which realize the improvement of isolation/protection effectiveness for time-lasting excitation at a low frequency. This study not only demonstrates the advantages of nonlinearity induced by local magnetic interaction on the improvement of isolation performances but also realizes a continuous structure with local quasi-zero stiffness applied in fields of low-frequency engineering structures.
机译：在这项研究中，将磁相互作用作为局部负刚度分量应用于连续结构，以改善隔振性能并扩展隔振带。根据电磁场理论，建立了相互作用力的力学模型。使用该模型可以发现，磁性相互作用可以使用适当的结构参数局部感应负刚度特性。由于磁体的不同结构参数可以以不同的效果增加负刚度强度，因此连续梁和磁体的参数被调整以局部地设计精确的零刚度特性。然后，通过推导零平衡附近的稳态解，建立结构参数与有效隔离带宽之间的关系。由于非线性和零刚度特性仅在零平衡附近局部出现，并且系统在大振幅时显示正刚度特性，有效隔离带显着扩展，并且振幅-频率曲线类似于共振时的线性系统。 。相关实验表明，磁体的结构参数在隔离特征上具有显着的调谐特性，从而实现了对低频持续激励的隔离/保护效果的提高。这项研究不仅证明了局部磁相互作用引起的非线性在提高隔离性能方面的优势，而且还实现了具有局部准零刚度的连续结构在低频工程结构领域中的应用。

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