桥梁断面颤振导数识别的耦合自由振动方法

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (24) : 5-8.

论文

桥梁断面颤振导数识别的耦合自由振动方法

丁泉顺王景朱乐东

作者信息 +

Coupled free vibration technique for identifying flutter derivatives of bridge decks

Ding Quanshun, Wang Jing,, Zhu Ledong

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文章历史 +

摘要

通过对系统复模态的特征分析发现，只要给定一个折减风速，就可以唯一地确定出系统的振动模态参数；反之，如果已知某一折减风速(或折减频率)时系统的振动模态参数，将可以确定出对应于该折减风速的桥梁断面各颤振导数。基于该思想，建立了从系统振动模态参数确定桥梁断面颤振导数的方法，该方法理论严密，并根本上克服了现有耦合自由振动颤振导数识别方法存在的缺陷。通过数值算例对该桥梁断面颤振导数识别方法的可靠性和适用性进行了有效的验证，且该识别方法能够对桥面颤振发散后的颤振导数进行识别。

Abstract

Based on the characteristic analysis of the system mode, it has been noted that the complex modal parameters of the system could be computed from a characteristic analysis when the reduced wind velocity is known. On the contrary, the corresponding flutter derivatives of bridge decks can be determined in a unique manner on condition that the complex modal parameters of the system at one reduced wind velocity (reduced frequency) are obtained. Based on the idea, a new method for identifying the flutter derivatives of bridge decks from the complex modal parameters of the system is proposed and it is theoretically exact and can overcome the main shortcoming of the existing method. The reliability and applicability of the proposed method to extract the flutter derivatives from coupled free vibration are proved with numerical examples and it could work even then the flutter occurred.

导出引用

丁泉顺王景朱乐东. 桥梁断面颤振导数识别的耦合自由振动方法[J]. 振动与冲击, 2012, 31(24): 5-8

Ding Quanshun;Wang Jing;Zhu Ledong. Coupled free vibration technique for identifying flutter derivatives of bridge decks[J]. Journal of Vibration and Shock, 2012, 31(24): 5-8