An Analysis Method for Dynamic Response of Elastic Aircraft Wake Vortex Encounter

An analysis method and dynamic response technology, applied in special data processing applications, geometric CAD, design optimization/simulation, etc., can solve the problems of elastic aircraft wake vortex encounter dynamic response analysis that have not seen the introduction of public research results, etc. The effect of increasing the density of take-off and landing at the airport and reducing the flight interval

Active Publication Date: 2021-07-16
XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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Problems solved by technology

Domestically, there is a certain basis for the study of wake vortex on the flight safety of civil aviation aircraft, but so far no public research results have been released on the analysis of the dynamic response of elastic aircraft wake vortex encounters.

Method used

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  • An Analysis Method for Dynamic Response of Elastic Aircraft Wake Vortex Encounter
  • An Analysis Method for Dynamic Response of Elastic Aircraft Wake Vortex Encounter
  • An Analysis Method for Dynamic Response of Elastic Aircraft Wake Vortex Encounter

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Embodiment

[0033] The parameters of the aircraft with wake vortex generation: weight 27.6t, length 27.9m, cruising speed 152.7m / s, flight speed of aircraft with wake vortex encounter at 100m / s, 90° in-plane crossing, other parameters are consistent with wake vortex generation aircraft.

[0034] The first step is to calculate the strength of the wake vortex dragged by the wake vortex generating aircraft based on the weight, overload, wingspan, airfoil parameters and other data of the wake vortex generating aircraft

[0035]

[0036] In the formula: Γ is the strength of the wake vortex, that is, the volume of the wake vortex; m is the mass of the aircraft; n z is the normal overload of the aircraft; b 0 =sB, is the distance between the left and right wake vortex cores; B is the wingspan; s is the airfoil parameter, which is related to the shape of the wing, and it is desirable for an elliptical wing For swept wings, it can be 0.75~0.80.

[0037] second step, figure 1 It is a schemat...

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Abstract

The invention belongs to the technical field of aeroelasticity, and relates to a dynamic response analysis method for an elastic aircraft wake vortex encounter. Step 1, calculate the wake vortex intensity encountered by the elastic aircraft according to the following formula; Step 2, calculate the induced velocity of the counter-rotating wake vortex system encountered by the elastic aircraft; Step 3, solve the wake vortex unsteady aerodynamic force encountered by the elastic aircraft; Step 4, use the frequency The domain method is used to solve the frequency-domain dynamic response of the elastic aircraft wake encounter; step 5, according to the frequency-domain dynamic response of the elastic aircraft wake encountered in step 4, the time-domain dynamic response of the elastic aircraft wake encounter is solved by Fourier inverse transform; Step six, according to the time-domain dynamic response of the wake vortex encounter of the elastic aircraft obtained in step five, use the modal displacement method to calculate the dynamic response of the load passing through the aircraft structure. A dynamic response analysis method for elastic aircraft wake vortex encounters is established to provide means for the analysis of wake vortex encounters in domestic aircraft design.

Description

technical field [0001] The invention belongs to the technical field of aeroelasticity, and relates to a dynamic response analysis method for an elastic aircraft wake vortex encounter. Background technique [0002] Wake vortex encounter directly affects aerial refueling, formation flight and maneuver flight of military aircraft, and is also the main factor restricting airport flow and endangering the flight safety of civil aviation aircraft. Foreign countries have been carrying out research on the aerodynamic characteristics of wake vortex and the safety of aircraft wake encounters. Since 2007, researchers from Israel's Karpel et al., German Aerospace and Airbus have begun to study the dynamic response analysis methods of elastic aircraft wake vortex encounters. , and have successively launched analysis software such as Dynresp, VarLoads and Gusto, which are not publicly released. In addition, foreign countries have carried out flight test research on wake vortex encounters ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/15G06F30/23
CPCG06F30/15G06F30/23Y02T90/00
Inventor 杨佑绪赵冬强张红波
Owner XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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