摘要
研制了桥梁节段模型颤振导数测定的二维强迫振动实验装置,采用变频调速技术实现对振动频率的控制,模型惯性力、气动力的测量采用了特殊设计的测力元件,模型运动用压电式加速度计进行测量。实验时,模型分别作单自由度的竖弯或扭转的简谐运动,通过测量模型所受到的气动力及模型位移,应用谱分析方法和非线性曲线拟合算法实现了对八个颤振气动导数的辨识,并通过平板模型实验数据与Theodorsen理想平板数据及国外文献数据对比对实验装置及辨识算法进行了检验。
A 2D forcedvibration driver for ADs identification of longspan bridge sectionmodel has been developed, by which the sectionmodel is forced to perform 1D or coupled torsional/vertical sinusoidal motion. In each test, lift force and torsional moment are both measured by force balances, the motions of the model are measured by accelerators, then the eight ADs are obtained by a hybrid method of spectrum analysis and nonlinear optimization. The results of a flat plate sectional model obtained in wind tunnel tests by this driver are compared with the solutions of Theodorson flat plate and other published datas,the comparison shows that all of the datas share the same trends.
出处
《国防科技大学学报》
EI
CAS
CSCD
北大核心
2003年第5期22-25,共4页
Journal of National University of Defense Technology
基金
国家自然科学基金资助项目(59778043)
关键词
强迫振动
节段模型
颤振导数
参数辨识
风洞实验
桥梁
forced vibration
section-model
Flutter derivatives
parameter identification
Wind tunnel tests
