考虑接触非线性的航行体出水结构动力学分析  

Dynamic analysis of underwater launched vehicle during water exit considering contact nonlinearity

作　　者：尤天庆[1] 王聪[1] 曹伟[1] 魏英杰[1] 何春涛[1] 

机构地区：[1]哈尔滨工业大学航天学院,哈尔滨150001

出　　处：《振动与冲击》2011年第8期28-31,50,共5页Journal of Vibration and Shock

基　　金：中国博士后科学基金项目(20080440884)

摘　　要：水下发射航行体在出水过程中,随着沾湿表面积减少,航行体与周围流体相互作用而产生时变流固耦合效应,并引起结构动力学特性的变化。同时,考虑到航行体通常采用舱段式结构,各舱段在连接处存在非线性接触问题,对结构动力学特性也存在实质性影响。在考虑上述因素影响的情况下,将航行体简化为Timoshenko梁模型并利用有限元方法对结构动特性和动响应进行计算分析,得到了出水过程时变流固耦合效应及连接刚度非线性对航行体结构固有频率及动力响应的影响规律,在此基础上进一步分析了连接结构、载荷及出水速度的变化对结构动响应特性的影响。While underwater launched vehicle crossing water free surface, time-varying fluid-structure-interacti effect is formed due to the interaction between the vehicle and surrounding water, accompanying with the decrease of surface. As a result, a variety of structure dynamic behaviors occur. Moreover, compartment structure is widely adoptd in underwater launched vehicle and the joint part between two compartments causes nonlinear contact problem, whi~ effects structural dynamic property. Considering the above factors, ti^e vehicle was simplified into a Timoshenko bean and the modal analysis and transient analysis were carried out. The specific effects of the time-varying fluid-structur interaction and the nonlinear stiffness at the joint part on the structural natural frequencies and dynamic responses we discussed. Besides, the effects of the joint construction, external load and water exit velocity on structure dynam responses were analyzed.

关 键 词：航行体 流固耦合 连接刚度 出水 有限元分析 

分 类 号：V214.3[航空宇航科学与技术—航空宇航推进理论与工程]