MODIFIED LEAST-SQUARE METHOD FOR IDENTIFICATION OF BRIDGE DECK AERODYNAMIC DERIVATIVES
MODIFIED LEAST-SQUARE METHOD FOR IDENTIFICATION OF BRIDGE DECK AERODYNAMIC DERIVATIVES
复制标题
DOI：
--
复制
发表时间：
2001
期刊：
影响因子：
--
通讯作者：
Ding Quanshun;Chen Airong;Xiang Hai-fan
中科院分区：
文献类型：
--
作者：
Ding Quanshun;Chen Airong;Xiang Hai-fan
本文在分析总体最小二乘法识别甲板气动导数存在问题的基础上，提出了一种新的识别方法--修正最小二乘法。为了避免迭代求解非线性参数时噪声引起的发散，提出了一种阶梯因子。对实验数据的模态参数识别结果表明，该方法具有较好的可靠性和鲁棒性，收敛速度较快。该方法能够识别临界颤振后的气动导数。
Based on the analysis of the problems in identifying deck aerodynamic derivatives by total least-square method, a new method-named as modified least-square method-is presented in this paper. To avoid the divergence caused by noise in solving the nonlinear parameters through iterations, a stepped factor is proposed. The results in identifying modal parameters from experimental data show that the present method has better reliability and robustness, which converges more quickly. The method is able to identify the aerodynamic derivatives after the critical flutter.