Method and tail fin for improving flight stability of hung object of helicopter

A technology for helicopters and suspensions, which is applied in the field of improving the flight stability of helicopter suspensions, and can solve problems such as long shimmy motion time periods and threats to safe flight of helicopters

Inactive Publication Date: 2013-01-16
BEIHANG UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem of shimmy vibration is manifested in the fact that when the suspended body is flying with the helicopter, due to the interference of the crosswind, it will center on the connection of the rope, and the left and right shimmy motion will occur. The time period of the shimmy motion is very long, and if it encounters The shimmy of the hanging body with a large mass will pose a great threat to the safe flight of the helicopter

Method used

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  • Method and tail fin for improving flight stability of hung object of helicopter
  • Method and tail fin for improving flight stability of hung object of helicopter
  • Method and tail fin for improving flight stability of hung object of helicopter

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Embodiment Construction

[0011] One object of the present invention is to solve the shimmy problem of the helicopter suspension body during flight. According to one embodiment of the present invention, the above-mentioned shimmy problem is solved by installing a tail fin as a stabilizer at the tail of the helicopter suspension body; wherein, according to one embodiment of the present invention, by analogy to the effect of the vertical tail of a fixed-wing aircraft , using the principles of computational fluid dynamics to determine the parameters of the tail fin.

[0012] According to an embodiment of the present invention, the tail fin is made of composite material, which has the advantages of light weight and convenient portability. In addition, regarding the installation of the tail fin, the commonly used door closer structure is adopted, which is convenient for maintenance and use.

[0013] In order to better solve the shimmy problem during the flight of the helicopter suspended body, the stabiliz...

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Abstract

In a flight process of a hung object of a helicopter, bounce and shimmy of the hung object can be caused, bounce time is short so that influence of the bounce on safety of the helicopter is low, but the time period of the shimmy is long, and the shimmy greatly threatens the flight safety of the helicopter. In allusion to the shimmy of the hung object of the helicopter in the flight process, effects of vertical tail fins of a fixed-wing aircraft are imitated, aerodynamic resistance encountered in the flight process of the hung object is calculated by utilizing a principle for calculating hydromechanics, a flight stabilizing device preliminary design principle for stabilizing the shimmy movement of the hung object on simple harmonic motion is provided, and a stabilizing device is designed. The stabilizing device is simple in principle, easy to process, convenient to assemble, and the like.

Description

technical field [0001] The invention relates to a method for improving the flight stability of a helicopter suspension body and a tail fin. Background technique [0002] Helicopter, as an important aircraft, has a wide range of applications in both military and civilian applications. Helicopter hanging object flight is one of the more common and important applications in many application fields of helicopters, and it is mostly used in emergency relief, geological exploration and other fields. During the flight of the helicopter with the suspended object, two common phenomena of the suspended body are the bouncing problem of the suspended body and the shimmy problem. The bouncing problem is manifested in the fact that the suspension body bounces in the vertical dimension when the suspension cable is tightened for a moment, but this phenomenon has little impact on the safety of the helicopter. The problem of shimmy vibration is manifested in the fact that when the suspended ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B64D47/00
Inventor 马超李国知曹义华吴祯龙
Owner BEIHANG UNIV
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