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A method for analyzing ground resonance of helicopters in taxiing or taxiing conditions

An analysis method, helicopter technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as different, reduced wheel lateral stiffness, blade damper damping characteristics processing, etc.

Active Publication Date: 2019-03-26
CHINA HELICOPTER RES & DEV INST
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Problems solved by technology

[0003]The ground resonance characteristics of helicopter taxiing and taxiing are different from vertical take-off and landing. On the one hand, the lateral stiffness of the wheel will decrease with the increase of speed; A Coriolis force with a frequency of Ω is generated, that is to say, the rotor system is subjected to simple harmonic motion excitations of two vibration frequencies of ωξ and Ω at the same time. At this time, the damping characteristics of the blade damper cannot be used alone frequent work to process

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  • A method for analyzing ground resonance of helicopters in taxiing or taxiing conditions
  • A method for analyzing ground resonance of helicopters in taxiing or taxiing conditions
  • A method for analyzing ground resonance of helicopters in taxiing or taxiing conditions

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[0046] The application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the related application, not to limit the application. In addition, it should be noted that, for ease of description, only parts relevant to the present application are shown in the drawings.

[0047] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and embodiments.

[0048] Ground resonance is essentially a dynamic stability problem of the rotor with elastic support in the rotating plane force, which can be calculated by using the plane dynamic model, such as figure 1 as shown, figure 1 It is a simplified diagram of the plane dynamic model p...

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Abstract

A method for analyzing ground resonance of a helicopter in a taxiing or taxiing condition include obtaining a lateral stiffness coefficient of a tire of a helicopter, an equivalent damping of a damper, and a method for analyzing ground resonance of a helicopter in a taxiing or taxiing condition. The effective mass, stiffness and damping of the damper are obtained according to the vibration frequency of the rolling mode. The equivalent damping, effective mass, effective stiffness and effective damping of the damper are substituted into the rotor. Coupling equations of airframe system are derived to obtain the ground resonance characteristics in taxiing or taxiing state.

Description

technical field [0001] The present application relates to the technical field of helicopter dynamics, and specifically provides an analysis method for ground resonance in a helicopter taxiing or taxiing state. Background technique [0002] Taxiing and taxiing are common ground use states of helicopters. Under certain conditions of use, the helicopter must roll to land or take off with a speed roll. In addition to the speed requirements of the landing gear and wheel brakes, it is also necessary to give a taxi slide analysis based on the dynamic stability analysis of this type of helicopter from the perspective of ground resonance. Run speed limit to ensure the safety of running in the state of taxiing and taxiing. [0003] The ground resonance characteristics of helicopter taxiing and taxiing are different from vertical take-off and landing. On the one hand, the lateral stiffness of the wheel will decrease with the increase of speed; bear ω ξ The simple harmonic motion exc...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/15Y02T90/00
Inventor 周华程金送凌爱民
Owner CHINA HELICOPTER RES & DEV INST
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