A method for verifying the anti-bird impact performance of helicopter main blade pitch-variable tie rods

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

Active Publication Date: 2018-04-27
CHINA HELICOPTER RES & DEV INST
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  • Claims
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Problems solved by technology

[0004] At present, the domestic civil helicopter airworthiness work is in its infancy, and there are few researches on the bird strike verification technology of helicopter moving parts, and there is no reliable identification method for the anti bird strike performance of the main blade variable pitch tie rod structure

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  • A method for verifying the anti-bird impact performance of helicopter main blade pitch-variable tie rods
  • A method for verifying the anti-bird impact performance of helicopter main blade pitch-variable tie rods
  • A method for verifying the anti-bird impact performance of helicopter main blade pitch-variable tie rods

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Embodiment Construction

[0027] In order to solve the above problems, the present invention proposes a method for verifying the anti-bird strike performance of the variable-pitch rod of the main blade of the helicopter, and accurately obtains the anti-bird strike performance of this type of structure. Even if a bird strike occurs during the most severe flight of the helicopter, no disaster will occur. sexual consequences.

[0028] The method for verifying the anti-bird impact performance of the helicopter main blade pitch variable rod of the present invention comprises the following steps:

[0029] The first step is to select the main blade pitch variable rod that is consistent with the installed technical state of the helicopter as the test piece, and paste the strain gauge on the test piece;

[0030] The second step is to design the test bench and test fixture for applying axial compressive load to the main blade pitch change rod, and install the test piece on the test bench;

[0031] The third ste...

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Abstract

The invention discloses a method for verifying the anti-bird impact performance of a helicopter main blade pitch-variable tie rod, which belongs to the field of helicopter structural strength tests, and mainly relates to a method for determining the performance of a helicopter main blade pitch-variable tie rod after bird strike damage occurs during flight. In view of the high probability of bird strikes and great harm in the low airspace of the main blade variable pitch rod of the helicopter, the full-scale structure simulates the bird strikes in the real working environment, the 30-minute fatigue life verification and residual strength test after the strikes, accurately Evaluate the bird strike resistance of this type of structure to ensure that the helicopter will not have catastrophic consequences even if a bird strike occurs during the harshest flight.

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...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M7/08
Inventor 顾文标晏峰邹静潘春蛟虞汉文
Owner CHINA HELICOPTER RES & DEV INST
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