大型薄壁缠绕型复材壳体的振动特性研究

Research on vibration characteristics of wound composite shell

为研究大型薄壁缠绕型复材壳体的结构振动特性,基于复合材料层合板理论,采用有限元方法建立了某型号整流罩壳体结构细观分析模型,开展了整流罩壳体的模态仿真,以工程中常用的随机振动输入条件进行了振动特性分析研究,并进一步仿真分析了铺层方式、壳体厚度等关键参数对于整流罩壳体结构振动特性的影响规律。结果表明:壳体厚度对整流罩壳体呼吸模态的影响较大,随着模态阶数的升高,在同一振型情况下,厚度对材料结构的性能影响愈来愈大,在工程中常用的随机振动输入条件作用下,厚度变化对结构低频振动响应的影响较小;铺层方式对整流罩壳体的振动特性影响显著,当0°、45°和90°铺层同时存在的情况下,其低频振动特性相对较好,故通过优化铺层方式来提高整流罩壳体刚性是更为有效的措施。

In order to investigate the vibration characteristics of wound composite shell,based on the composite laminate theory,using finite element method,the meso analysis model of fairing shell has been built.The modal simulation and random vibration of the fairing shell is also developed.Through the simulation analysis,the effect of ply sequences and shell thickness to the vibration characteristic of fairing shell has been studied.The results show that the thickness of the shell has a great effect on the breathing mode of the fairing shell.Under the commonly random vibration input,the thickness has little effect on the low frequency vibration response of the structure.The shell has better performances if 0°,45°and 90°directional layers co existed at the same time.The ply sequences have a significant impact on the vibration characteristics of the fairing shell,and it is more effective to improve the rigidity of the fairing shell by optimizing the layering method.