结构抗振动疲劳设计动力学优化方法研究

项目名称： 结构抗振动疲劳设计动力学优化方法研究

项目编号： No.51265040

项目类型： 地区科学基金项目

立项/批准年度： 2013

项目学科： 机械、仪表工业

项目作者： 贺红林

作者单位： 南昌航空大学

项目金额： 50万元

中文摘要： 近年来航空航天领域内振动疲劳现象大增，严重地危及飞行器的安全可靠性。本项目针对飞行器的复杂结构振动及其引发的振动疲劳问题，拟在约束阻尼结构拓扑优化研究的基础上，探索构建飞行器振动疲劳设计优化方法。首先研究多约束态无阻尼结构优化方法；然后，基于模态损耗因子最大化目标，研究多约束态附加阻尼结构的动力学优化及多约束态约束阻尼结构渐进结构优化法（ESO）；拟将模糊数学理论引入ESO以构建结构的多目标分层渐进优化架构，探讨结构柔度和共振频率等目标下的模糊分层渐进优化问题；进而以模态参数尤以结构共振和反共振频率为依据，研究动力学拓扑优化法在结构抗振动疲劳设计中的应用；最后通过飞行器典型振动件的模态试验与疲劳试验，验证结构抗振动疲劳优化设计的效果。项目将结构拓扑优化引入疲劳设计学，探寻实现结构动力学优化与振动疲劳理论的融合，着力创生抗振动疲劳设计新方法，对推进疲劳设计理论及抗疲劳技术的发展具有重要意义。

中文关键词： 振动疲劳理论；粘弹阻尼减振；动力学优化；拓扑渐进法；变密度法

英文摘要： It is reported that the phenomenon of vibration fatigue of the mechanical struture is increasing greatly in the field of aviation and aerospace in recent years,which endangers the aircrafts' safety and reliabilithe seriously. In order to solve this problem,taking into accounting the complicated structure vibration of the aircrafts and the vibration fatigue which is caused mainly by the mecahanical structure resonace vibration,and based on method of constrained damping structural topology optimization, this project is going to investigate the dynamic optimization of the aircraft structure systematacially so as to reduce or lessen the vibration fatigue phenomenon to some extent in the aircrafts. Firstly, the dynamics optimization of structure with non-damping but multiple constraints will be discussed. Then,aimed to maximizing the structure modal factor of the aircraft structure,both the dynamics optimization method and the evolutionary structural optimization method for the structures with multiple constraints and additional damping will be studied deeply.Meanwhile,the mathematical fuzzy optimization theory will be drawn into the evolutionary structural optimization so that the multi-objective layered dynamic structure optimization method could be developed, which is mainly oriented to optimize both the flexibi

英文关键词： vibration fatigue；vibration reduction with damping；structural dynamics optimization；evolutionary structural optimization；alterable density method