空气舵系统摩擦模型及参数识别方法研究  

Friction model and parameter identification method for an air rudder system

作　　者：李雨青 南宫自军[1] 刘博[1] LI Yuqing;NANGONG Zijun;LIU Bo(China Academy of Launch Vehicle Technology,Beijing 100076,China)

机构地区：[1]中国运载火箭技术研究院,北京100076

出　　处：《振动与冲击》2021年第22期98-103,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金面上项目(11972377);爆炸科学与技术国家重点实验室开放基金资助项目(KFJJ19-04M)。

摘　　要：空气舵作为常用的飞行器执行机构,存在间隙与摩擦等非线性特性,其非线性建模是一个反复迭代的过程,需要选择合适的模型反映其真实的动力学特性。为此,该研究采用库仑摩擦模型和Stribeck摩擦模型建立了含间隙和摩擦的舵系统非线性动力学模型,并分别采用最小二乘非线性拟合法和遗传算法使用试验数据对模型中的未知参数进行识别。研究表明,相较于Stribeck摩擦模型,库仑摩擦模型能较为准确地反映系统中的摩擦力矩,两种参数识别方法均能有效完成未知参数的识别。In an air rudder system,acting as a kind of commonly used aerospace vehicle effector,there are usually nonlinear factors such as clearance and friction.Its nonlinear modeling is an iterative process and it is necessary to select a suitable model to reflect its true dynamic characteristics.To this end,the Coulomb friction model and the Stribeck friction model were used respectively to establish the nonlinear dynamics model of the rudder system with clearance and friction,and the least square nonlinear fitting method and the genetic algorithm were applied to identify the unknown parameters in the model based on experimental data.The results show that,compared with the Stribeck friction model,the Coulomb friction model can more accurately reflect the friction torque in the actual system,and both the parameter identification methods can effectively achieve the identification of unknown parameters.

关 键 词：空气舵系统 库仑摩擦 Stribeck摩擦 参数识别 

分 类 号：V44[航空宇航科学与技术—飞行器设计] O32[理学—一般力学与力学基础]