Displacement Analysis of a New Type of Helicopter Rotor Control Mechanism without Traditional Non-rotating Scissor

doi:10.3901/JME.2024.15.071

Abstract

Abstract: The helicopter rotor control mechanism is a type of relatively complex hybrid mechanism, and the research on the complete kinematics of this type of hybrid mechanism is particularly important. A new type of helicopter rotor control mechanism is proposed, which uses a 2SPS+RPU+PS mechanism as a parallel driving module, eliminating the non-rotating scissor in traditional mechanisms. Taking this mechanism as an example, a complete solution to the displacement of this class of control mechanism is provided. Firstly, the constraint forces/torques of the control mechanism is analyzed, and its degree of freedom is calculated. Secondly, by clarifying the geometric and dimensional constraints in the mechanism, the constraint equations of the mechanism are obtained. The coupling relationship between the pitch angles of three blades and the pose parameters of the rotating swashplate is established through constraint equations. Combined with the Sylvester elimination method, an analytical model for solving the pose of the rotating swashplate is obtained, and then the inverse displacement of the overall mechanism is obtained. Once again, the closed form solution of the forward displacement of the 2SPS+RPU+PS mechanism is solved using the elimination method. Through the motion transmission relationship of the upper mechanism, the pitch angles of the three blades are obtained, and thus the forward displacement of the overall mechanism analysis is completed. Finally, an example of the displacement analysis of the mechanism in a general configuration is provided, achieving accurate solutions of the forward and inverse displacement of the control mechanism. This study provides a reference for the displacement research of helicopter rotor control mechanisms.

Key words: rotor control mechanism, hybrid mechanism, kinematics, forward displacement, inverse displacement

CLC Number:

TG156

HU Bo, GAO Tian, HU Guofeng, LI Tao, ZHAO Jinjun. Displacement Analysis of a New Type of Helicopter Rotor Control Mechanism without Traditional Non-rotating Scissor[J]. Journal of Mechanical Engineering, 2024, 60(15): 71-79.

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