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为了提高函数替换法的适用范围,对现有的函数替换法进行了分析,提出了一种改进的函数替换法,并使用该方法建立了变形无人机的纵向LPV模型。首先,对现有的LPV系统建模方法进行了总结,通过在函数替换法基础上引入部分线性化,使变参数的选取更为灵活,增强了函数替换法的实用性;然后,以变形无人机纵向系统为例,给出了基于所提出方法的纵向LPV系统模型;最后,对所建立模型的有效性进行了验证。结果表明,所建立的模型与原始非线性模型近似程度很高,证明了该方法的有效性。
In order to improve the application range of function substitution method, the existing function substitution method is analyzed, an improved function substitution method is proposed and used to establish the longitudinal LPV model of the deformation UAV. First of all, the existing LPV system modeling methods are summarized. By introducing partial linearization based on the function substitution method, the selection of variable parameters is more flexible, and the practicability of function substitution method is enhanced. Secondly, As an example, the longitudinal LPV system model based on the proposed method is given. Finally, the validity of the model is verified. The results show that the established model is close to the original nonlinear model and the validity of the method is proved.