机身刚度对T尾颤振(发散)速度影响的分析研究

建立了T尾带后机身动力学模型,根据后机身截面刚度的不断变化,分别分析了它们的固有频率特性及颤振速度。本文为了简化计算规模,只进行一般地定性研究,并只考虑了平尾迎角为零的情况。用P-K法计算了临界颤振速度及发散速度,并分析了不同的颤振特性。最后,用线性最小二乘法得出后机身的不同支持刚度对T尾的临界颤振(发散)速度影响的趋势曲面。本次计算结果为以后的T尾颤振分析打下了基础,为后机身的刚度分配提供了宝贵的数据支持。

Flutter Analysis Research of T-tail According to the Different Supporting Stiffness

T-tail dynamical model with the aft fuselage is established in this article..The natural frequency and flutter characteristics of the model are analyzed respectively.The simulative model is simply treated,and qualitative investigation and analysis,generalization are presented.The critical flutter or divergent speeds of T-tail are attained by P-K method,while the horizontal tail only at zero attack angle is taken as the computation condition.Lastly,the relationship between the critical flutter or divergent velocity of T-tail and the different bending-torsional section stiffness of the aft fuselage is fitted to the flutter surface through Linear Least Square Method.These calculation results offer the fundamentals of flutter analysis of T-tail in the near future.They also provide the precious data for the section stiffness distribution of the aft fuselage.