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首页> 外文期刊>The Journal of Strain Analysis for Engineering Design >Optimal normal load variation in wedge-shaped Coulomb dampers
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Optimal normal load variation in wedge-shaped Coulomb dampers

机译：楔形库仑阻尼器的最佳法向载荷变化

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摘要

Wedge-shaped frictional dampers are widely used in civil, mechanical and aeronautical engineering with the purpose to limit and damp vibrations, increase component fatigue life, or resist seismic loads. The wedge shape induces normal load variations which complicates the analysis. Here, we study a model which can be considered a generalization of the Griffin model, originally devised for underplatform dampers in turbine blade attachments. The model has a mass element (the body whose vibrations are to be damped) linked to the wall by means of a spring and to a massless Coulomb damper via a contact stiffness". In Griffin's work the normal load acting on the Coulomb damper was kept constant. We introduce cyclic amplitude of the normal load, and phase shift between tangential and normal load. It is found that the optimization curves maintain the minimum for the mean normal load expected by Griffin's model. However, a lower vibration amplitude is found for in-phase loading with respect to the constant load, over the entire frequency range. When the contact stiffness" is higher than the structure stiffness (as it is generally expected), the maximum vibration decrement for in-phase loading is around 40%.
机译：楔形摩擦阻尼器广泛用于土木，机械和航空工程，其目的是限制和阻尼振动，延长部件疲劳寿命或抵抗地震载荷。楔形会引起法向载荷变化，这会使分析复杂化。在这里，我们研究的模型可以看作是Griffin模型的推广，该模型最初是为涡轮机叶片附件中的平台下阻尼器设计的。该模型具有一个质量元件（要阻尼振动的主体），该质量元件通过弹簧连接到墙壁，并通过接触刚度连接到一个无质量的库仑阻尼器。”在格里芬的工作中，保持了作用在库仑阻尼器上的法向载荷我们引入了法向载荷的循环振幅，以及切向载荷和法向载荷之间的相移，发现优化曲线对格里芬模型所期望的平均法向载荷保持最小值，但是对于在整个频率范围内，相对于恒定负载的最大相位衰减。当“接触刚度”高于结构刚度（通常是期望的）时，同相负载的最大振动衰减约为40％。

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