Kinematic Analysis of a New Type of Coaxial Helicopter Control Mechanism

doi:10.3901/JME.2016.01.047

Abstract

Abstract: A new coaxial reduced degree of freedom (DOF) hybrid mechanism is put forward. The mechanism is a series formed coaxial hybrid mechanism which is composed of a 3-SPS+PS+RRS parallel mechanism and a hybrid mechanism. The overall mechanism has simple and compact structure, so it can be applied in the three blade coaxial unmanned helicopter. The restrain of 3-SPS+PS+RRS parallel mechanism is eauivalent restrain of PS subchain. The hybrid mechanism is decomposed into several equivalent parallel mechanisms. The degree of freedom of swashplate mechanism is analyzed by screw theory and the upper swashplate and lower swashplate are proved to keep the same posture. A conclusion is reached that the whole coaxial hybrid mechanism satisfying degrees of freedom of the operating mechanism of three blade coaxial helicopter under the consideration of the lower parallel mechanism. The position of upper operating mechanism is analyzed and the variation of the rotation angle of three pitchs is studied when the swashplate keep the inclined posture. The whole operation mechanism is simulated through PRO/E.

Key words: coaxial helicopter, displacement analysis, equivalent DOF, mechanism simulation, reduced DOF hybrid mechanism

CLC Number:

V227

GUO Xijuan, MENG Xiaogang, WANG Yuzhen, CHANG Fuqing, HUANG Tianyu. Kinematic Analysis of a New Type of Coaxial Helicopter Control Mechanism[J]. Journal of Mechanical Engineering, 2016, 52(1): 47-56.

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Kinematic Analysis of a New Type of Coaxial Helicopter Control Mechanism

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