Friction model and parameter identification method for an air rudder system

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (22) : 98-103.

LI Yuqing，NANGONG Zijun，LIU Bo

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Abstract

As a kind of commonly used aerospace vehicle effector, air rudder has nonlinear characteristics 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, this paper uses the Coulomb friction model and the Stribeck friction model to establish the nonlinear dynamics model of the rudder system with clearance and friction,and uses the least square nonlinearfitting method and the genetic algorithm to identify the unknown parameters in the model using 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 parameter identification methods can effectively complete the identification of unknown parameters.

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Air rudder system / Coulomb friction / Stribeck friction;Parameter identification

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LI Yuqing，NANGONG Zijun，LIU Bo. Friction model and parameter identification method for an air rudder system[J]. Journal of Vibration and Shock, 2021, 40(22): 98-103

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