基于三维升力线方法的大变形飞机非线性静气动弹性配平问题
首发时间:2012-12-27
摘要:大展弦比飞机由于几何非线性现象显著,基于小变形假设的线性气动弹性分析方法已经不再适用。为此将升力线方法推广到三维情况,用于计算空间任意形状气动面的气动力。结合推广的多维曲面插值方法,解决大变形飞机曲面气动力与空间变形结构之间的信息传递问题。针对大变形机翼的几何非线性特点,推导非线性的静气动弹性全机配平方程,并用简单算例与线性方法进行对比验证,突出非线性计算结果的特点。基于以上理论所建立的针对大变形飞机的静气动弹性载荷及配平分析体系,因其方法简单快速,应用对象广泛,在初步设计和快速分析中有很大的应用前景。
关键词: 静气动弹性配平 几何非线性 曲面气动力 推广的升力线法 飞行载荷
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Aeroelastic trim analysis of flexible aircraft based on 3-D lifting-line theory
Abstract:An effective and easy way to analyses the very flexible aircraft with large aspect ratio wing has been established in this paper, focusing on the static aeroelastic trim considering the geometric nonlinearity of the structure and the nonplanar effects of aerody-namics. This new method is based on the 3-D lifting-line theory, which is applied to compute the nonplanar steady aerodynamics. Surface spline interpolation method is responsible for the struc-ture/aerodynamics coupling. By combing these creative methods above and using the iterative computation based on rigid aircraft trim, the results considering the nonlinear effects have been obtained and compared with the linear results, which indicate the new method is much more effective and reliable to the facts and very suitable for the rapid and efficient analysis in the preliminary stage of very flexible aircraft design.
Keywords: static aeroelasticity trim geometric nonlinearity nonplanar aerodynamics 3-D lifting-line thoery flight loads
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