Repair method of composite main paddle with hinge moment variance

A hinge moment, composite material technology, applied in aircraft maintenance, aircraft parts, ground installations, etc., can solve the problem that the hinge value of the main blade does not meet the requirements

Active Publication Date: 2015-02-11
HARBIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When adjusting the dynamic balance of composite material main blades, when some main blades adjust the adjustment piece to the limit, the hinge value of the main blades still does not meet the requirements

Method used

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  • Repair method of composite main paddle with hinge moment variance
  • Repair method of composite main paddle with hinge moment variance
  • Repair method of composite main paddle with hinge moment variance

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Experimental program
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Embodiment Construction

[0035] Taking the repair of a composite blade with a length of 5250 mm and a chord of 405 mm as an example, the present invention will be described in further detail below.

[0036] A repair method of composite material main blade hinge torque is out of tolerance. The specific steps of this method are as follows:

[0037] The first step is to reasonably define the repair area of ​​the main blade according to the over-tolerance of the blade hinge torque: (1) When the angle of all the adjustment blades of the main blade reaches the positive limit +6°, the blade tip The rear edge is polished, and the glass cloth on the rear edge of the upper wing surface of the wing tip, 2 layers of carbon cloth and 1 layer of glass cloth on the rear edge of the lower wing surface are peeled off. The peeling width is 30mm from the rear edge to the front edge. The length of the blade is 700mm from the tip of the wing to the root of the wing, and the thickness of the trailing edge of the stripped part i...

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Abstract

The invention relates to the technical field of helicopter paddle manufacture, in particular to a repair method of a composite main paddle with hinge moment variance. A method for repairing the rear edge of the paddle to compensate the pneumatic force of the paddle is proposed through data analysis and analogy tests according to the characteristics of the structure and pneumatic force of the main paddle by analyzing the pneumatic principle and structure of the main paddle. By changing the laying mode of carbon cloth and glass cloth on the rear edge of the main paddle to influence the upward or downward moment of the paddle, the moment value of the main paddle is changed and meets the requirement; after the main paddle with the hinge moment variance is repaired by the method, through verification, the repair method is feasible, effective and strong in operability, and various performance indexes all meet the paddle delivery requirements; the basis is provided for repairing the main paddle with unqualified dynamic balance.

Description

Technical field [0001] The technical field of the manufacture of helicopter blades of the present invention, in particular, relates to a repair method of composite main blades. Background technique [0002] Hinge moment of main blade: The hinge moment of a helicopter rotor blade refers to the moment formed by the load acting on the blade to the blade's moment-changing axis, which includes moment of inertia, moment of power, and moment of friction. Acting on the hinge moment on the blade, it generates a bending moment on the moment-changing rocker arm of the blade, and forms an axial force on the moment-changing rod of the automatic tilter through the moment-changing rocker arm. [0003] For the composite main blade, during the manufacturing process of the blade, due to the performance difference of the composite material, the selection of curing parameters, the uncontrollable local temperature of the blade in the mold molding, the mold itself and the operation of the workers, the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B64F5/00B64F5/40
Inventor 杨库刘政张元瑞李成
Owner HARBIN
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