薄壳非线性气动弹性系统初始缺陷敏感度研究

项目名称： 薄壳非线性气动弹性系统初始缺陷敏感度研究

项目编号： No.11302181

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 范晨光

作者单位： 西南交通大学

项目金额： 26万元

中文摘要： 近空间高速飞行器具有薄壳形式的气动外形，薄壳在制造流程或服役阶段会存在初始缺陷，将影响薄壳非线性气动弹性系统的运动稳定性及非线性动力学行为。研究系统对这些缺陷的敏感度具有重要的理论意义和工程应用价值。本研究拟从现有的初始缺陷敏感度理论和薄壳非线性气动弹性理论出发，建立薄壳非线性气动弹性系统初始缺陷敏感度的理论分析方法，以期揭示初始缺陷影响下系统的复杂非线性动力学现象及其产生机理，为高速飞行器的风洞实验、气动弹性设计、振动控制等问题提供理论依据和技术支持。主要研究内容为：建立含有初始缺陷的薄壳非线性气动弹性力学模型，研究圆柱形扁壳和完全截锥壳非线性气动弹性系统的初始缺陷敏感度，建立初始缺陷敏感度理论评价体系，将基本薄壳气动弹性模型向其它薄壳模型演化,并建立薄壳气动弹性系统统一分析方法，进行模型地面模拟实验等。

中文关键词： 初始缺陷；敏感度；薄壳；非线性；超声速

英文摘要： Thin shells are fully used in the aerodynamic shape design of near space high speed vehicles. In the manufacture process or service stage, some initial imperfections will be formed, which can significantly affect the stabilities and the nonlinear dynamic behaviors of the aeroelastic shell systems. To investigate these sensitivities of initial imperfections is an important work with theoretical and practical significance. In this project, the new analytic method to solve this problem will be established based on the theories of the shell imperfection sensitivities and the nonlinear aeroelasticities, which will reveal the effects of initial imperfections on the complicated nonlinear dynamic behaviors and the mechanisms, and can provide the theoretical reference and technical support for wind tunnel experiment, aeroelastic design and vibration control. The main research contents include: the establishment of nonlinear aeroelastic models of the imperfect shells, the imperfection sensitivities of aeroelastic shallow cylindrical shells and conical shells, the initial imperfection sensitivities evaluating system, the deduction of the basic shell aeroelastic models to other shell forms, the unified analysis method for aeroelastic shells, and the ground model experiments.

英文关键词： initial imperfection；sensitivity；thin shell；nonlinear；supersonic