Method for verifying bird strike resistance performance of pitch link of main blade of helicopter

A technology of variable pitch tie rod and verification method, which is applied in the direction of machine/structural component testing, measuring device, impact test, etc., can solve the lack of reliability of anti-bird strike performance of the main blade variable pitch tie rod structure, and relatively poor research on bird strike verification technology. Wait for the question
CN104776970AActive Publication Date: 2015-07-15CHINA HELICOPTER RES & DEV INST
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHINA HELICOPTER RES & DEV INST
Publication Date
2015-07-15

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Abstract

The invention discloses a method for verifying the bird strike resistance performance of a pitch link of a main blade of a helicopter, and belongs to the field of helicopter structural strength tests. The method is used for determining the performance of the pitch link of the main blade of the helicopter after bird strike damage is generated in the flight process. Aiming at the characteristics that the pitch link of the main blade of the helicopter is high in bird strike probability in low airspace, and damage is serous, the bird strike resistance performance of this kind structures is assessed accurately through the bird strike tests of the full size structure under simulated real working environment, fatigue life verification tests half hour after striking and residual strength tests, and it is guaranteed that catastrophic results cannot be generated even if bird strike occurs to the helicopter in the harshest flight process.
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Description

technical field

[0001] The invention belongs to the field of helicopter structural strength tests, and mainly relates to a method for determining the performance of a main blade pitch-variable tie rod of a helicopter after bird strike damage occurs in flight. Background technique

[0002] As a special low-altitude aircraft, helicopters are mainly used in the range of 0 to 1000 meters. For example, the use time ratio of a certain type of aircraft in the range of 0 to 600 meters is as high as 40%. This range is the main activity of flying birds. Therefore, the accidents of bird strikes on helicopters worldwide have remained high. Although a helicopter is a low-speed aircraft, its flight speed is generally within 300km / h, but compared with a fixed-wing aircraft, it has a high-speed rotating rotor system. Generally, the speed of the main rotor system of a helicopter is between 200 rpm and 400 rpm. , the speed of the tail rotor is higher, so if the bird strike occurs in the roto...

Claims

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