弹性飞行器非定常气动力的递推识别

 本文提出了一种识别弹性飞行器非定常气动力的滤波递推方法。该法由飞行试验数据识别出各气动指示函数的时域离散值,若经适当拟合处理,可为弹性飞行器动态分析提供较为理想的非定常气动模态。对某飞行器进行初步试算的结果表明,该方法所需数据易于采集,计算不十分繁杂,所得结果较好。

RECURRENT IDENTIFICATION OF UNSTEADY AERODYNAMIC FORCES OF ELASTIC VEHICLES

A method for identifying unsteady aerodynamic torees of elastic vehicles is presented. A standard measurement equation satisfied by aerodynamic indicial functions is derived from longitudinal small-disturbance equations of elastic vehicles with unsteady aerodynamic forces described by Duhamel's integral.The discrete values of aerodynamic indicial functions in time domain are obtained by using recurrent filter technique. In comparison with other methods, this method has the following advantages: （1） convenience to take the effects of structure deformation into account; （2） capability to identify the unsteady aerodynamic parameters of the w.hole vehicle; （ 3 ） ease to collect initial data; （ 4 ） simplicity of the calculation. Finally, some results of the preliminary calculation for a vehicle are given.