垂尾抖振响应工程计算方法研究

Study on the Engineering Calculation Method for Vertical Tail Buffet Response

分析了突风响应计算与抖振响应计算在计算原理上的差异,并提出一种修改NASTRAN突风响应计算流程作为进行抖振响应计算的方法。该方法可以采用刚性模型风洞试验测得的参考点脉动压力数据作为输入激励,翼面运动产生非定常气动力贡献则可以突风响应计算中偶极网格法计算模块计算。在NASTRAN软件的基础上,应用DMAP语言进行SOL 146求解器求解流程的修改,实现了抖振响应计算程序的二次开发,实现了突风载荷计算的屏蔽和抖振激励载荷的表征和输入处理。算例验算表明了算法的可行性。

The differences between gust response computation and buffet response computation are analyzed,and a calculation method for buffet response by modifying gust response computational procedure of the NASTRAN software is proposed.This method uses the power spectral density of the fluctuation pressure obtained from the wind-tunnel test of a rigid model as the external excitation,and the aerodynamic forces due to vertical fin motion can be calculated using a subsonic doublet-lattice lifting surface method which has been involved in the gust response calculating module of NASTRAN solver.Base on the NASTRAN software,we re-developed a buffet response calculation software,which used the DMAP language to modify the computational procedure of NASTRAN gust response,and to shield the gust load calculation,and to realize the directly input of buffet force.Then,a numerical example was performed to validate the feasibility of the proposed method.