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一、引言近几年来,国外刊物发表了一些用影响系数法分析和计算弹性飞机动态特性问题的文章(见文献[1～7])。这些文章在准静弹性假设下处理飞机运动问题时,引入了一组惯性导数和方位角导数,从而使运动方程在形式上与习惯用的刚性飞机运动方程有了差别。这样,除增加了导数数目外,还使过去对刚性飞机建立起来的、关于某些导数的概念以及导数与运
I. INTRODUCTION In recent years, foreign publications have published some articles on the analysis and calculation of the dynamic characteristics of flexible aircraft using the influence coefficient method (see [1] ~ [7]). These papers introduce a set of inertial derivatives and azimuthal derivatives when dealing with aircraft motions under quasi-static elastic assumptions, so that the equations of motion differ in form from the conventions of rigid aircraft equations. In this way, in addition to increasing the number of derivatives, it also makes the concept of certain derivatives and the derivative and the fortune built up in the past for rigid aircraft