项目名称: 梁板结构的分布动载荷识别技术
项目编号: No.51305197
项目类型: 青年科学基金项目
立项/批准年度: 2014
项目学科: 机械、仪表工业
项目作者: 姜金辉
作者单位: 南京航空航天大学
项目金额: 25万元
中文摘要: 动载荷识别(或重构)属于动力学研究的第二类逆问题,也是动力学研究的难点问题之一,特别是针对分布动载荷模型的识别,研究难度更大。本项研究以Bernoulli -Euler梁结构、弹性薄板结构为研究对象,在结构线弹性体系范畴内,系统和深入地研究了复杂分布动载荷识别技术。将矩量法、不适定问题的正则化方法与结构动力学逆分析相结合,探讨复杂形式的分布动载荷识别理论。主要研究内容包括:建立梁板结构复杂分布的确定性分布动载荷的时域识别理论;将确定性分布动载荷模型引申至随机性分布动载荷,研究随机分布动载荷的识别方法;探讨分布动载荷识别过程中的不适定问题,指出改善识别精度的方法,同时针对动载荷识别精度的影响因素进行归纳和总结;通过本项研究,旨在从理论上完善和发展动力学逆问题,另一方面为工程上特别飞行器结构潜在的动载荷识别问题做技术铺垫。
中文关键词: 分布动载荷;逆问题;离散;正则化;试验验证
英文摘要: The identification (or reconstruction) of dynamic load is the second kind of the inverse problem in structural dynamic analysis, which is difficult problem especially for distrubuted dynamic load in dynamics domain. Based on linear elastic theory, the project presents systematic study of identification technology for Bernoulli-Euler beam and elastic thin plate. Combining Method of moments, the ill-posed problems, regularization method with the inverse analysis of structural dynamics,the research foucuses on the identifcation of complex distrubuted dynamic load. The contents of this study are as follows: (1)Establishing identification theory in time domain for complex distributed dynamic load acting on the beam and plate.(2)Researching identificaton Methodology of distributed random dynamic load.(3) Investigating ill-posed problem of the distributed dynamic load identification, pointing out the method to improve the reconstruction accuracy. Meanwhile, summarizing the factors affect identification accuracy. This study is to improve and develop theory of dynamical inverse problem and provide the technology support for the potential application of dynamic load identification problem, especially for aircraft structural engineering.
英文关键词: distributed dynamical load;inverse problem;discretization;regularization;experiment verification