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描述了旋翼飞行器飞行力学模型的系统辨识建模算法,从旋翼飞行器飞行动力学建模的共性问题入手,首先采用机理建模的方法分析了旋翼飞行器主要气动部件所受气动力。考虑旋翼挥舞运动对旋翼飞行器飞行动力学特性的影响,建立了旋翼飞行器的飞行力学系统辨识参数化模型集。其次以子空间方法辨识初始飞行动力学模型,采用加权频域预报误差法获得最优模型的两步辨识方法解决旋翼飞行器这一非线性不稳定,多输入-多输出系统辨识问题,且所辨识模型与机理模型具有相同的结构。最后对样例直升机的悬停飞行状态模型辨识进行了数值与试飞试验验证,表明了方法的有效性。
This paper describes the system identification modeling algorithm of rotorcraft flight dynamics model. Starting from the common problem of rotorcraft flight dynamics modeling, the aerodynamic force of the main aerodynamic components of rotorcraft is first analyzed by mechanism modeling method. Considering the influence of rotor-wielding waving motion on the flight dynamics of rotorcraft, a parameterized model set of rotorcraft aeromechanics system identification was established. Secondly, the initial flight dynamics model is identified by using the subspace method, and the two-step identification method of the optimal model is obtained by using the weighted frequency-domain prediction error method to solve the rotor-wing system identification problem of nonlinear instability and multiple-input-multiple-output Model and mechanism model have the same structure. Finally, the model helicopter hovering flight state model identification and test flight test results show the effectiveness of the method.