Time domain identification method with improved robustness for rotorcraft flight dynamics modeling

Abstract

A time domain identification method based on set-membership theory for rotorcraft flight dynamics modeling is developed in this paper. In order to solve the difficulties in applying standard set-membership identification algorithm to identify the flight dynamics model of a rotorcraft due to its inherent complexity, an improved Optimal Bounding Ellipsoid (OBE) method is established. The basic OBE algorithm for multi-input multi-output system is derived firstly, and then an indirect OBE algorithm for state space model is established. The concept of generalized noise is introduced and the noise bound optimization is implemented. Finally, the established identification method is used to identify the flight dynamics models of a helicopter and a quad-rotor aircraft separately. The results show that the method developed in this paper is able to identify the flight dynamics model of a rotorcraft with high accuracy as well as robustness.