考虑热效应的气动伺服弹性分析方法研究

Aeroservoelasticity Analysis of Aircrafts Under Thermal Effects

高速飞行器气动加热效应会影响飞行器结构动力学特性,从而影响飞行器气动伺服弹性(ASE)稳定性,这就是热气动伺服弹性问题。在考虑热效应的飞行器动力学特性分析的基础上,结合非定常气动力分析,提出了一种考虑气动加热效应的飞行器ASE分析方法。结合工程算例,验证了该方法的有效性,并研究了热效应对飞行器ASE稳定性的影响。最后,对飞行器热气动伺服弹性设计提出了一些建议。

A novel analysis method for aeroservoelasticity of hypersonic aircrafts under thermal effects was presented. Firstly, the natural structural modes under thermal circumstances were calculated with the nonlinear additional stiffness caused by thermal stress introduced. Secondly, the aerodynamic influence coefficient matrices were conducted based on the unsteady aerodynamic theory. Then the influence of temperature elevation on the aeroservoelasticity characteristics of an aircraft under thermal effects was analyzed with this method. The numerical results indicate that the method meets the requirement in engineering. Meanwhile, the influence of aerodynamic heating on the natural frequencies and aeroservoelasticity characteristics of the aircraft is discussed.