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Experimental evaluation of an inertial mass damper and its analytical model for cable vibration mitigation

机译：惯性质量阻尼器的实验评估及其减轻电缆振动的分析模型

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摘要

Cables are prone to vibration due to their low inherent damping characteristics. Recently, negative stiffness dampers have gained attentions, because of their promising energy dissipation ability. The viscous inertial mass damper (termed as VIMD hereinafter) can be viewed as one realization of the inerter. It is formed by paralleling an inertial mass part with a common energy dissipation element (e.g., viscous element) and able to provide pseudo-negative stiffness properties to flexible systems such as cables. A previous study examined the potential of IMD to enhance the damping of stay cables. Because there are already models for common energy dissipation elements, the key to establish a general model for IMD is to propose an analytical model of the rotary mass component. In this paper, the characteristics of the rotary mass and the proposed analytical model have been evaluated by the numerical and experimental tests. First, a series of harmonic tests are conducted to show the performance and properties of the IMD only having the rotary mass. Then, the mechanism of nonlinearities is analyzed, and an analytical model is introduced and validated by comparing with the experimental data. Finally, a real-time hybrid simulation test is conducted with a physical IMD specimen and cable numerical substructure under distributed sinusoidal excitation. The results show that the chosen model of the rotary mass part can provide better estimation on the damper's performance, and it is better to use it to form a general analytical model of IMD. On the other hand, the simplified damper model is accurate for the preliminary simulation of the cable responses.
机译：电缆由于固有的低阻尼特性而易于振动。近年来，负刚度阻尼器由于其有希望的能量消散能力而受到关注。粘性惯性质量阻尼器（以下称为VIMD）可以看作是惰轮的一种实现。它是通过将惯性质量部分与常见的能量耗散元素（例如，粘性元素）平行来形成的，并且能够为诸如电缆之类的柔性系统提供伪负刚度特性。先前的研究检查了IMD增强斜拉索阻尼的潜力。因为已经有通用能量消耗元件的模型，所以建立IMD通用模型的关键是提出旋转质量分量的分析模型。通过数值和实验测试，对旋转质量的特性和所提出的分析模型进行了评估。首先，进行了一系列谐波测试，以显示仅具有旋转质量的IMD的性能和特性。然后，分析了非线性的机理，并通过与实验数据的比较介绍了一个分析模型并进行了验证。最后，在分布式正弦激励下，使用物理IMD标本和电缆数值子结构进行了实时混合仿真测试。结果表明，所选择的旋转质量部件模型可以更好地估计减振器的性能，最好将其用于形成IMD的通用分析模型。另一方面，简化的阻尼器模型对于电缆响应的初步仿真是准确的。

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