摘要
先进的航空航天器结构暴露在严酷的工作载荷环境中,包括复杂的机械力载荷、压力载荷、声载荷和热载荷,这些载荷会导致结构以非线性方式响应。研究了随机压力载荷作用下高温薄壁结构动态响应计算方法,并构建了计算模型。首先讨论了温度对结构刚度的影响,分析表明屈曲前结构刚度随温度升高而降低,屈曲后结构刚度随温度升高而升高。在此基础上着重讨论了随机压力载荷作用下高温薄板跳变响应,对热载荷作用下的结构屈曲,以及在随机压力载荷作用下呈现出的复杂非线性动态响应特征进行了分析。
Exposure to severe operation environment, including complex mechanical, pressure, acoustic, and thermal loads, can cause advanced aircraft and spacecraft structures to respond in a nonlinear fashion and exhibit complex response characteristics. This paper builds a model to calculate the dynamic response of thin-wall structure under combined loads. First, this paper analyzes stiffness changes of thin-wall structure under thermal loading, which shows that as temperature inceases the structure＇s pre-buckling stiffness de- creases and its post-buckling stiffness increases. Based on this phenomena, this paper examines the dynamic thermal buckling induced by random loading and complex response characteristics of thin-walled structure.
出处
《沈阳航空航天大学学报》
2011年第1期5-9,共5页
Journal of Shenyang Aerospace University
基金
航空基础科学基金资助基金项目(项目编号:02C54007)
关键词
高温薄壁结构
随机压力载荷
热屈曲
跳变响应
thin-wall structure
random pressure loading
thermal buckling
snap-through
