弹性预紧约束非线性对结构振动的影响
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装备预研基金资助课题(6140210010202)


Effect of nonlinear elastic preload on vibration of structures
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    摘要:

    针对大型空间可展开结构中存在的关节非线性间隙约束问题,研究弹性预紧约束非线性对结构动态特性的影响.首先,基于轴向拉伸力学模型,构造了轴向拉伸关节三维梁单元.其次,使用KelvinVoigt接触及Coulomb摩擦模型,建立了粘弹性预紧约束下整体结构非线性动力学方程,继而分析了不同预紧约束下关节对结构非线性振动的影响.结果表明,在关节非线性约束下,结构振动传递特性的高频响应增加,低阶振动能量传递到高阶振动上.

    Abstract:

    The paper studies the effect of elastic preloading constraints on structural dynamics of large space deployable structures with joint alearances. Based on the axial tension model, a 3D beam element of the axial tension joint was constructed. Then, considering the nonlinear mechanical behavior of the elastic pretensioned joint, the dynamic equations of the full structure were established based on KelvinVoigt contact model and Coulomb friction model. The influence of preload force on the structural vibrations was analyzed. The results showed that under the nonlinear joint constraints, the vibration transmission at high frequency increases, and the energy of low-order modes is transferred to the higherorder ones.

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陈金,金栋平.弹性预紧约束非线性对结构振动的影响[J].动力学与控制学报,2020,18(2):69~75; Chen Jin, Jin Dongping. Effect of nonlinear elastic preload on vibration of structures[J]. Journal of Dynamics and Control,2020,18(2):69-75.

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历史
  • 收稿日期:2019-01-19
  • 最后修改日期:2019-03-19
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  • 在线发布日期: 2020-05-07
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