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An aeroelasticity analysis method considering internal fluid dynamic characteristics

A technology of aeroelasticity and analytical methods, applied in special data processing applications, instruments, electrical digital data processing, etc., to achieve high engineering application value, improve analysis accuracy, and easy operation

Active Publication Date: 2019-05-07
XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the influence of these factors is rarely considered in the analysis of aeroelasticity in China.

Method used

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  • An aeroelasticity analysis method considering internal fluid dynamic characteristics
  • An aeroelasticity analysis method considering internal fluid dynamic characteristics
  • An aeroelasticity analysis method considering internal fluid dynamic characteristics

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Embodiment Construction

[0011] The invention provides an aeroelastic analysis method considering the influence of internal fluid dynamic characteristics. By adding an additional mass matrix to the mass matrix of the motion equation, the consideration of the influence of internal fluid dynamic characteristics is realized.

[0012] (1) Generate an additional mass matrix considering the internal fluid

[0013] Assuming that the internal fluid is inviscid and incompressible, the area occupied by the solid is Ω S , the area occupied by the internal fluid is Ω F , its free surface is Γ, and the interface between fluid and solid is Σ, the schematic diagram is shown in figure 1 . The Euler equation for the internal fluid is

[0014]

[0015] where p, ρ F and u F are the pressure, density and displacement of the fluid respectively, and t is the time;

[0016] The continuity equation for an inviscid and incompressible fluid is

[0017]

[0018] where v F is the fluid velocity;

[0019] Accordin...

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Abstract

The invention belongs to an aircraft aeroelasticity analysis technology, and particularly relates to an aeroelasticity analysis method considering internal fluid dynamic characteristics. According tothe method, firstly, an additional mass matrix considering internal fluid is generated, then a motion equation considering the additional mass matrix is assembled, and then aeroelasticity analysis considering the influence of the internal fluid is carried out. According to the method provided by the invention, the influence of internal fluid dynamic characteristics can be considered in the dynamicsimulation model of the aircraft with a large number of internal fluid, so that the aeroelasticity analysis precision of the whole aircraft can be improved, and the aeroelasticity design can be better guided. And the provided analysis method is simple and convenient to operate and has a relatively high engineering application value.

Description

technical field [0001] The invention belongs to aircraft aeroelastic analysis technology, and in particular relates to an aeroelastic analysis method considering internal fluid dynamic characteristics. Background technique [0002] In order to improve combat effectiveness, modern aircraft, especially large tankers and fighter jets, carry a large amount of fuel. For the evaluation of the aeroelastic characteristics of these aircraft, the traditional calculation method regards the internal fluid as a concentrated mass, and only considers its mass and inertia characteristics, without considering the dynamic characteristics of the internal fluid and the influence between the internal fluid and the container. The structural vibration problems caused by such internal fluid-structure coupling, and the influence of fluid elasticity on the aeroelastic characteristics of aircraft are still unclear. At present, the influence of these factors is rarely considered in the analysis of aer...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCY02T90/00
Inventor 党云卿曾宪昂蒲利东李俊杰陈海
Owner XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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