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结合断面的颤振导数,采用阶跃函数对桥梁断面自激力进行模拟,并对模拟准确性进行了分析与校核;推导出时域颤振动力有限元分析中自激力的递推表达式。基于阶跃函数拟合气动力,利用APDL语言在ANSYS中实现了颤振时域分析;以一简支梁为例,介绍了在ANSYS中实现颤振时程分析的过程。数值算例计算结果和相关文献报道基本一致。研究表明:利用ANSYS的二次开发平台进行桥梁气动稳定性能的时域分析是可行的,该方法可提高桥梁颤振分析或颤抖振理论分析效率,降低自主开发大型软件过程中的算法错误或疏漏所带来的风险。
Combined with the flutter derivative of the cross section, the self-excitation of bridge section was simulated by step function, and the simulation accuracy was analyzed and checked. The recursion expression of self-excitation in time-domain flutter dynamic finite element analysis formula. Based on the step function fitting aerodynamic force, using the APDL language in the ANSYS to achieve the chatter time domain analysis; to a simple support beam, for example, introduced in the ANSYS chatter time history analysis process. Numerical calculation results are basically the same as those reported in the related literature. The research shows that it is feasible to use the secondary development platform of ANSYS to analyze the aerodynamic stability of the bridge in time domain. This method can improve the analysis efficiency of flutter analysis or chatter vibration theory and reduce the error or omission of the algorithm in large-scale software development The risks.