空间一维结构分布动载荷时域识别方法  

A Time Domain Identification Method for Distributed Dynamic Loads on 1D Spatial Structures

作　　者：万成[1,2] 严波[1] WAN Cheng YAN Bo(College of Aerospace Engineering, Chongqing University, Chongqing 400044, P.R. China College of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, P.R. China)

机构地区：[1]重庆大学航空航天学院,重庆400044 [2]重庆交通大学土木工程学院,重庆400074

出　　处：《应用数学和力学》2017年第9期967-978,共12页Applied Mathematics and Mechanics

基　　金：国家自然科学基金(51277186)~~

摘　　要：提出一种适用于空间一维结构分布动载荷的时域识别方法.基于空间分段和时间分段的思想,推导了载荷时程识别的公式和过程.用MATLAB编写了载荷识别程序,以受分布动载荷简支梁和受随机风载荷输电导线的载荷识别对方法和程序进行验证,并通过仿真试验研究了噪声对载荷识别的影响.结果表明,该方法对于线性问题有很高的识别精度,对于弱非线性问题能够满足工程应用要求,为分布动载荷时域识别提供了有效的途径.A time domain identification method for distributed dynamic loads on 1D spatial structures was proposed. Based on the idea of spatial and temporal divisions,the formula and process for load time history identification were derived. The load identification program was compiled by means of MATLAB,and the identification method was verified through 2 examples： a simply supported beam subjected to distributed dynamic loads and a power line subjected to stochastic wind loads. Moreover,the effect of noise on the load identification was investigated through numerical simulation. It is shown that the distributed loads can be accurately identified for linear problems and approximately identified for weakly nonlinear problems with the presented method,which provides an efficient way to identify distributed loads on engineering structures.

关 键 词：分布动载荷 载荷识别 时域方法 

分 类 号：TH113[机械工程—机械设计及理论] TB123[理学—工程力学]