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Device for improving aeroelastic stability of bearing-free rotor and design method of device

A technology of aeroelastic stability and design method, which can be used in rotorcraft, transportation and packaging, aircraft, etc., and can solve problems such as aeroelastic stability.

Inactive Publication Date: 2014-05-14
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the bearingless rotor blade adopts in-plane soft structure and strong coupling effect, the problem of aeroelastic stability is very serious, so how to improve the aeroelastic stability of the rotor is an important issue in the design of bearingless rotorcraft

Method used

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  • Device for improving aeroelastic stability of bearing-free rotor and design method of device
  • Device for improving aeroelastic stability of bearing-free rotor and design method of device
  • Device for improving aeroelastic stability of bearing-free rotor and design method of device

Examples

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Embodiment

[0061] This example gives a bearingless rotor, the characteristic parameters of the rotor are as follows: number of blades N=4, rotor radius R=0.9144m, chord length c=0.0774m, rotor solidity σ=0.1079, rotor rated speed Ω= 817rpm, Lock number γ=5.673, pitch variable rod stiffness Kp=7.0×104N / m, distance between pitch variable rod and elastic shaft d=0.03111R, blade linear torsion rate θ TW =-11.3°, the hub pre-cone angle βp=0, the blade airfoil is VR-12, the blade pre-twist angle is 9°, and the blade sweep angle is -2°.

[0062] In this example, the radius of the circular shimmy pin, the length of the horizontal part and the length of the vertical part are used as design variables. In order to simplify the calculation process, the shimmy pin is set as a rigid body structure in this example, so the radius basically has no effect on it, while The length of the horizontal part of the shimmy pin is the smallest, that is, X=0. At this time, the shimmy pin is directly connected to th...

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Abstract

The invention discloses a device for improving the aeroelastic stability of a bearing-free rotor and a design method of the device, and belongs to the field of helicopter dynamics. According to the invention, a shimmy pin is added between a rotor hub and a torsion sleeve. The design method comprises the following steps of: firstly determining design variables and the upper limit and the lower limit of each design variable; dividing each design variable at equal intervals between the upper limit and the lower limit into a plurality of design points so as to form a design space; solving the aeroelastic stability of the bearing-free rotor corresponding to each design point in the design space, thereby obtaining parameters which represent the aeroelastic stability of the bearing-free rotor and correspond to the design point one by one in the design space; and finally solving the function taking the upper limit and the lower limit of the design variables as a restriction condition, thereby obtaining a bearing-free rotor structure with the optimum aeroelastic stability. According to the invention, the arrangement of the shimmy pin can restrict the movement of the torsion sleeve, and the shimmy damping of a paddle can be increased, and further the aim for improving the aeroelastic stability of the bearing-free rotor is achieved.

Description

technical field [0001] The invention belongs to the field of helicopter dynamics, in particular to a shimmy pin device for improving the aeroelastic stability of a bearingless rotor and a design method thereof, which can be used in the design of a bearingless rotor helicopter. Background technique [0002] The rotor is the core component that generates lift, forward force and control force for the flight of the helicopter, so its design and analysis are the key technologies of the helicopter. For traditional articulated helicopters, the propeller hub is made of metal structure, which is complex in structure, heavy in weight, high in maintenance and overhaul costs, short in life, and less effective in rotor control. [0003] The bearingless rotor system is a new type of helicopter rotor system following the articulated, semi-articulated and hingeless rotors, and is one of the most advanced helicopter rotor systems at present. Compared with helicopter structures such as artic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B64C27/32B64C27/51
Inventor 向锦武任毅如高文杰罗漳平郭俊贤张亚军张连鸿阎永举
Owner BEIHANG UNIV
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