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Design method capable of expanding air resonance security boundary of helicopter

A technology of safety boundary and design method, applied in the direction of rotorcraft, motor vehicles, aircraft parts, etc., can solve problems such as limiting helicopters, and achieve the effect of improving flight safety and rigidity

Inactive Publication Date: 2015-09-09
CHINA HELICOPTER RES & DEV INST
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  • Abstract
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Problems solved by technology

[0005] The technical problem to be solved by the present invention: Aiming at the problem that helicopter air resonance may limit the use of envelopes for helicopter flight performance, by analyzing the influence of factors such as rotor blade structure and aerodynamics, body inertia characteristics and flight state on air resonance, it is proposed to suppress air resonance Design methods and measures for occurrence and expansion of airborne resonance safety boundary

Method used

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  • Design method capable of expanding air resonance security boundary of helicopter
  • Design method capable of expanding air resonance security boundary of helicopter
  • Design method capable of expanding air resonance security boundary of helicopter

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Embodiment Construction

[0022] The design method for extending the air resonance safety boundary of the helicopter involved in the present invention will be further described in detail below in conjunction with the accompanying drawings. By analyzing the influence of design and flight parameters on the helicopter's mid-air resonance, the design method of increasing the stiffness of the pitch control line and moving the effective pressure center of the blade backward is proposed, which can effectively delay the mid-air resonance under high-speed and large-overload flight conditions. occur, and achieve the design goal of expanding the safety boundary of air resonance. This technology has been used and will be used in the design of helicopters under research and in the future to ensure the realization of helicopter flight performance and improve the flight safety of helicopters. The specific steps are as follows:

[0023] (1) Determine the range of structural design parameters that affect airborne reson...

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Abstract

The invention discloses a design method capable of expanding an air resonance security boundary of a helicopter, relates to a design method capable of expanding the security boundary of air resonance appearing in the helicopter in the flying speed and force lifting overloading state, and belongs to the technical field of dynamic design of the helicopter. According to the rotor blade operation pneumatic environment of the flying state stipulated by a flight envelope which needs to consider a cover and properly exceeds the performance requirement of the helicopter, unstability of the air resonance is analyzed, and the pitch control stiffness is improved to the air resonance insensitive range; the width of paddle rear edge adjusting sheets and distribution of the paddle rear edge adjusting sheets in the expanding direction are increased, so that an equivalent aerodynamic center moves backwards; and the paddle aeroelasticity coupling characteristics are improved so as to expand the air resonance security boundary.

Description

technical field [0001] The invention belongs to the technical field of helicopter dynamics design, and in particular relates to a safety boundary design method for expanding helicopter flight speed and lift overload state to generate aerial resonance. Background technique [0002] With the continuous development of helicopter rotor design technology, the phenomenon of coupling shimmy instability between the rotor and the body not only exists on the ground, but also in the air. The classic ground resonance design technology that only considers the multi-blade shimmy motion of the rotor cannot meet the needs of new rotor technologies, The need for new configuration development. Composite rotor blades, spherical flexible hubs, bearingless and hingeless rotors all make the instability caused by the coupling between the rotor and the body very different from the original ground resonance phenomenon, while the spherical flexible hub, bearingless and The hingeless rotor helicopter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B64C27/467B64F5/00
Inventor 凌爱民朱艳钱峰
Owner CHINA HELICOPTER RES & DEV INST
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