摘要
复合材料壳结构在热声载荷下呈现复杂的振动响应。以四边简支复合材料壳结构为研究对象,采用有限元法计算了复合材料壳结构在不同温度和声压级组合下的振动响应。结合应力的时间历程、概率密度、功率谱密度进行研究。结果表明:屈曲前,应力概率密度基本服从正态分布;屈曲后,应力概率密度不服从正态分布,随着温度继续升高应力的概率密度变窄变尖,但是概率密度分布近似正态分布。热载荷产生的热应力会增加复合材料薄壁壳结构的刚度,改变壳结构基频,声载荷的增加会使复合材料薄壁壳结构的响应增大。
Composite shell structure presents complex vibration response under thermal acoustic loads. To calculate vibration response of simply supported composite shell structure under the different temperature and sound pressure levels,the finite element method is used. Combining with the time history of stress,vibration response of the probability density and power spectral density,the characteristic of vibration response is analyzed. The results showthat stress probability density is in normal distribution before buckling but after buckling it is not in normal distribution. As temperature rises continually,stress probability density narrows and sharpens in approximate normal distribution. The thermal stress caused by thermal load increases the stiffness of composite shell structure,which changes the fundamental frequency of shell structure. The acoustic load rise leads to more response of the shell structure.
出处
《沈阳航空航天大学学报》
2016年第2期6-11,共6页
Journal of Shenyang Aerospace University
基金
航空科学基金(项目编号:02C54007)
关键词
复合材料
壳结构
热声载荷
非线性响应
composite material
shell structure
thermal and acoustic loads
nonlinear response
