基于多阈值截取和不等概率抽样技术的随机减量法  

Random Decrement Method Based on Multiple Threshold Values Selection and Varying Probability Sampling Technique

作　　者：史文海[1,2] 李正农[2] 

机构地区：[1]温州大学建筑与土木工程学院,温州325035 [2]湖南大学土木工程学院,长沙410082

出　　处：《武汉理工大学学报》2010年第9期56-59,共4页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(50778072);"十一.五"国家科技支撑计划基金(2006BAJ06B05);温州市科技计划基金(S20090009)

摘　　要：将多阈值截取和不等概率抽样方法与随机减量法结合起来,对结构响应信号段长度不足时如何能较准确地识别结构系统的自振频率和阻尼比问题进行了研究,并给出了结构系统自振频率和阻尼比估计量的表达式。数值算例结果表明,当结构系统响应信号长度不足时,文中方法可较好地解决信号段长度与参数识别精度的矛盾,有效提高结构响应信号的利用率。This research addresses the application problem of multiple threshold values selection and varying probability sampling technique on random decrement method for parameter identification of a structural dynamic system.The issue of how to identify the structural frequency and damping ratio from insufficient measured response data of a structure system was studied.Then the expressions of identified structural parameter estimators were presented.The numerical results showed that the new method provides a good solution for solving the contradiction between signal length and identification precision when the structural response signal length is insufficient.

关 键 词：随机减量法 不等概率抽样 阻尼比 频率 多阈值截取 

分 类 号：TU311.4[建筑科学—结构工程]