DO 28非线性多点模型的建立及其参数估计

 本文建立了DO 28试验机的非线性六自由度多点数学模型。该模型考虑了飞机运动的高度非线性,螺旋桨、机翼、尾翼空气动力特性,改进的推力计算,风场干扰以及飞行试验数据一致性检验和校正。与一点模型相比,该模型能更准确地描述飞机的运动,更适合飞机的参数估计。

NONLINEAR MULTI-POINT MODELING AND PARAMETER ESTIMATION OF THE DO 28 RESEARCH AIRCRAFT

The modeling and parameter estimation of the DORNIER DO 28 research aircraft is a part of the special research program 212 of West Germany "airtraffic safety" (SFB 212" Sicherheit im Luftve-rkehr"). In this paper a nonlinear multi-point mathematical model with six-degree-of-freedom for DO 28 parameter estimation is presented. The model considers not only the high nonlinearity of aircraft motions, the characteristics of the propller of the wings and of the horizontal stabilizer, but also the wind disturbance by reconstruction of a quasi-stationary windfield, the improved algorithm for thrust calculation and the necessary corrections of the measured input/output signals through flight-test-data-compatibility-check. Nonlinear Maximum-Likelihood method and modified Newton-Raphson optimization algorithm are applied to the estimation of the stability and control derivatives of the DO 28 aircraft. Compared with one-point model of aircraft motion it is shown that Multi-point model can more accurately describe the aircraft motion and is more suitable for aircraft parameter estimation.