摘要
本文通过对现有沉浮模态各种近似解析解的分析比较，修正了经典解析法完全略去△α自由度的假设，计及了对此模态有相当影响的气动导数Ｃ＿（ｍａ）和Ｃ＿（ｍｑ）的作用，导出了沉浮模态二阶近似方程。算例结果证实，本方法具有较高精度，优于现有的几种近似解析解。
An improved analytical-method for the longitudinal phu-goid mode of aircraft is presented in this pape. Before now,there havebeen several approximate analytical-solutions for the phugoid mode, suchas,the method introduced by Lanchester, the classical method,“Bairstowand Ashkenas”method ,etc. Unfortunately, all of them are not exactenough when used in engineering design.The proposed method in the paper,in contrast to the classical method, takes account of the effects of aero-dynamic derivatives and in the △α-degree of freedom on the phu-goid mode. Thus, the accuracy of the method is obviously improved. Asknown, the analytical-solutions for the longitudinal phugoid mode of air-craft is specially useful as used to analyze the effects of aircraft parame-ters and flight conditions on the mode characteristics, in special, to designthe active control system for suppression of atmospheric turbulence.Final-1y it is worth to be specially mentioned that the proposed method isapplied to the flight conditions with different flight path angles.
出处
《空气动力学学报》
CSCD
北大核心
1995年第4期457-462,共6页
Acta Aerodynamica Sinica
关键词
沉浮模态
周期
大气湍流
飞机
phugoid mode, period, damping, atmospheric turbulence.
