空气舵气动力-脉动压力-结构耦合响应分析  

Analysis of aerodynamic force-fluctuating pressure-structure coupled response for air rudder

作　　者：郭静[1] 张忠[1] 谷迎松[2] 王建民[1] 李海波[1] 高博[1] GUO Jing;ZHANG Zhong;GU Yingsong;WANG Jianmin;LI Haibo;GAO Bo(National Key Laboratory of Science and Technology on Reliability and Environmental Engineering,Beijing Institute of Structure and Environment Engineering,Beijing 100076,China;School of Aeronautics,Northwestern Polytechnical University,Xi’an 710072,China)

机构地区：[1]北京强度环境研究所可靠性与环境工程技术重点实验室,北京100076 [2]西北工业大学航空学院,西安710072

出　　处：《航天器环境工程》2020年第3期235-239,共5页Spacecraft Environment Engineering

基　　金：国家自然科学基金项目(编号:11502024,11502023,11402028,51805036)。

摘　　要：气动力、脉动压力、结构振动相互作用,组成复杂的多场耦合系统,给动力学分析带来极大的挑战。文章基于PCL和DMAP语言自主研发了气动力–脉动压力–结构耦合响应分析软件,以复合材料空气舵为研究对象,建立其有限元模型,并开展模态分析;进而,建立基于Van Dyke修正活塞理论的气动模型,基于模态法分析了气动力–脉动压力–结构三者耦合的空气舵响应,并与不考虑气动力效应的非耦合结构响应进行对比,探究了气动力耦合效应对空气舵响应的影响规律。结果表明,气动弹性效应能使得空气舵振动响应从随机振动变为发散极限环振荡形式的高阶运动,显著改变脉动压力响应谱。可以预测,结构声疲劳分析中必须考虑气动弹性效应。The aerodynamic force,the fluctuating pressure,and the structural vibration together constitute a multi-field coupled system with complicated interactions,which poses an extremely challenging problem for the dynamic analysis.With the PCL and DMAP languages,a program for analyzing the aerodynamic forcefluctuating pressure-structure coupled response is developed.For an air rudder made of composite materials,a finite element model is established,and the modal analyses are carried out.An aerodynamic model based on the Van Dyke updated piston theory is established.The dynamic response of the air rudder with consideration of the coupling effect of aerodynamic force-fluctuating pressure-structure is obtained based on the modal analyses.Then the results are compared with the uncoupled response of the air rudder under the fluctuating pressure condition leaving out the coupling effect of the aerodynamic force.The influence of the aerodynamic force on the dynamic response of the air rudder is explored.It is indicated that due to the additional aeroelastic effect,the air rudder would shift from the random vibration to a high-order motion way in a pattern of diffused limit cycle oscillations(LCOs),and thus remarkably alter the spectrum of the fluctuating pressure response.It can therefore be said that the aeroelastic effect should be considered in the acoustic fatigue analysis for structures.

关 键 词：气动力 脉动压力 活塞理论 耦合响应 有限元模型 模态分析 

分 类 号：TB115.7[理学—数学] V414.8[理学—应用数学]