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Helicopter cockpit floor frequency-adjustable dynamic vibration absorber

A technology for dynamic vibration absorbers and helicopters, which is used in aircraft floors, aircraft accessories, non-rotational vibration suppression, etc., can solve problems such as large vibration, reduced structural fatigue life, and impact on flight safety, and achieves good vibration reduction effect, easy installation, good adaptability

Inactive Publication Date: 2020-01-14
HARBIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Large vibration not only reduces the fatigue life of the structure, but also makes the driver feel uncomfortable and prone to fatigue, which affects flight safety

Method used

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  • Helicopter cockpit floor frequency-adjustable dynamic vibration absorber

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Embodiment 1

[0023] The test piece manufactured according to the technical solution of the patent of the present invention has been verified by the installation and flight test on a certain aircraft of Z-19. The vibration level of the cockpit floor at the installation position of the dynamic vibration absorber has been reduced by a maximum of 44%, which proves that the dynamic vibration absorber can reduce the floor of the helicopter cockpit. vibration level. By installing the patented dynamic vibration absorber of the present invention, the vibration level of the cockpit floor can be effectively reduced. This solution solves the problem of large vibration of the helicopter cockpit floor, which can improve the driver's comfort, reduce the driver's fatigue, and improve flight safety.

[0024] Dynamic vibration absorber installation floor vibration level comparison

[0025] 100km / h 150km / h 180km / h 200km / h 220km / h Before installation 0.29g 0.24g 0.25g 0.29g 0.34g...

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PUM

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Abstract

The invention belongs to the technical field of helicopter vibration absorption, and relates to a helicopter dynamic vibration absorber. The vibration absorber comprises an upper supporting plate (1)and a lower supporting plate (2). One end of the upper supporting plate (1) and one end of the lower supporting plate (2) are fixed. The other end of the upper supporting plate (1) is fixed to the helicopter cockpit floor. A mass block is fixed to the other end of the lower supporting plate (2) and is suspended. The dynamic vibration absorber is small in structural size, simple and easy to install, can generate large antiresonance load, and has a good vibration absorbing effect. The service life of the vibration absorption structure is unlimited, and safety and reliability are achieved. When the dynamic vibration absorber is installed under the floor, a pilot is not disturbed, other control and system structures are not interfered, and the dynamic vibration absorber can well adapt to a helicopter.

Description

technical field [0001] The invention belongs to the helicopter vibration reduction technology, and relates to a vibration reduction device for a helicopter dynamic vibration absorber. Background technique [0002] The helicopter is subjected to periodic vibration loads during flight, which causes serious vibration problems in the helicopter. The large vibration not only reduces the fatigue life of the structure, but also makes the pilot feel uncomfortable and easy to fatigue, which affects the flight safety. In order to reduce helicopter vibration levels, helicopter vibration reduction technology can be used. Helicopter vibration reduction technology can be divided into passive and active two aspects. Passive vibration reduction technology refers to vibration reduction measures that do not require energy input from the outside world, such as dynamic vibration absorbers composed of springs and mass elements. Active vibration reduction technology requires energy input from ...

Claims

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Application Information

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IPC IPC(8): F16F15/02B64C1/18
CPCB64C1/18F16F15/02
Inventor 于仁业孙秀文李宗秀王金亮乔文慧夏发令
Owner HARBIN
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