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提出了一种在 ANSYS中实现颤振时程分析的有限元模型和分析方法。该模型采用 MA-TRIX2 7单元来模拟桥面主梁受到的自激力 ,依据刚度和阻尼等效的原则 ,推导了该单元的刚度矩阵、阻尼矩阵与颤振导数之间的关系 ,然后对整个系统的运动方程进行数值积分来确定系统的响应 ,通过位移时程曲线来判断结构的颤振稳定性。最后 ,以一简支梁为例介绍了在 ANSYS中颤振时程分析实现的过程 ,其分析结果与精确解、频域分析结果吻合很好
A finite element model and analysis method of flutter time history analysis in ANSYS is proposed. The model uses MA-TRIX2 7 element to simulate the self-excitation of the bridge deck girder. Based on the principle of stiffness and damping equivalence, the relationship between the stiffness matrix and the damping matrix of the element is derived. Then, The whole system of equations of motion is numerically integrated to determine the response of the system and the dither stability of the structure is judged by the displacement history curve. Finally, taking a simple supported beam as an example, the process of chatter time history analysis in ANSYS is introduced. The analysis results are in good agreement with the exact solution and frequency domain analysis