Dynamic modeling method of multi-transmission rotor hub structure

Abstract

The invention belongs to a dynamic design technique of helicopters, relates to a dynamic modeling method of a multi-transmission rotor hub structure and aims to prevent ground resonance of a bearingless rotor and expand the air resonance boundary. The accurate modeling analysis and design means is provided in terms of rigidity configuration, displacement coordination for a flexible beam, a control lever, a damper and a sleeve; dynamic finite element modeling of a multi-transmission rotor hub structure is performed first, and degrees of freedom of non-dependent joints of component parts of the structure are expressed in joint degree-of-freedom linearity; according to the dependency and relativeness of the joint degrees of freedom of the component parts of the structure, the independent joints, the relative joints and the displacement coordination relation between the component parts of the structure and the connective joints are determined so as to establish a dynamic rigidity matrix of the structure. By the use of the dynamic modeling method, the key difficulties in the design and analysis of the complex multi-transmission rotor hub structure are broken through.

Description

technical field [0001] The invention belongs to the design technology of helicopter dynamics, and relates to a dynamic modeling method of multi-way force transmission rotor hub structure. Background technique [0002] Bearingless rotor is currently the most advanced structure type of helicopter rotor, which uses composite material flexible beam to replace the horizontal hinge, vertical hinge and axial hinge of traditional articulated rotor hub. On the one hand, when the flexible beam bears the centrifugal load of the blade, it can use the deformation of the degrees of freedom of flapping, shimmy, and torsion to realize the flapping, shimmy, and pitch-changing motion required by the blade, and the deformation is complex; at the same time, because the flexible beam Provides greater flapping and shimmy stiffness for high handling efficiency and shimmy frequency. In order to provide sufficient damping to eliminate ground resonance and air resonance instability, artificial dampe...

AI Technical Summary

Problems solved by technology

[0004] At present, the configuration design of the domestic helicopter rotor hub is mainly aimed at the articulated type, the most typical is the spherical flexible hub configuration, and no research has been carried out on the configuration design of the multi-way force transmission rotor hub.

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