基于气动(气动噪声)/结构耦合仿真研究

摘要

Evaluating sound-vibration environment is a challenging task for vehicle. High-intensity acoustic loading which produced from the period of launching of shuttle, launch vehicle, spacecraft can excited local structure vibration, destroy apparatus of vehicle. Study about high noise intensity and prediction of random structure vibration received more and more attention in the aerospace-developed country. We summarized the present situation of integrated mechanics, presented the idea of aerodynamic noise/structure coupling, predicted the integrated mechanics of vehicle based on the coupling of three fields, physical acoustics, structural dynamics, and aerodynamic. Also, the key simulation technology about integrated mechanics of aerodynamic noise/structure coupling were analyzed, simulation method which presented in this paper inducted noise load into the existing research about aero elasticity, and constituted platform of three fields coupling. The modeling and simulation about Computing Fluid Dynamics / Computing Structure Dynamics /Computing Aero-Acoustics (CFD/CSD/CAA) coupling systems with the section were processed, and time domain structural response of section was acquired;also the feasibility of method was validated. We intended to develop the software of simulation and analysis of coupling analysis of multi-mechanics, structure, heat, aerodynamics, aerodynamic noise, and accumulated theoretical basic for advanced mechanics of hypersonic vehicles.%声振综合力学环境是航空航天飞行器的重要环境之一.航天飞机或运载火箭、飞船在起飞段产生强噪声环境,这种强噪声会激发局部结构振动,损伤飞行硬件,所以飞行器强噪声环境和随机结构振动预示受到了各航空航天大国的重视.综述了国内外综合力学环境研究现状,提出了气动(气动噪声)/结构耦合思想,即基于物理声学、结构动力学以及空气动力学的三场耦合,对飞行器综合力学环境进行预示.分析了气动(气动噪声)/结构耦合综合力学环境仿真的关键技术,提出的仿真基本思路是在已有气动弹性研究的基础上引入噪声载荷,建立三场耦合平台.以舱段为研究对象,进行了气动/结构/声学(CFD/CSD/CAA)耦合建模及仿真,获得舱段时域结构响应,验证了方法的可行性.研究目的是拟开发空间飞行器结构/热/气动/气动噪声多力学耦合分析的仿真环境分析软件.为研究用于高超声速飞行器复杂力学环境预示积累理论基础.