A three-dimensional lifting device parameterization method meeting engineering constraints based on an FFD method

A technology of increasing lift device and parameterization, which is applied in the field of parameterization of three-dimensional increasing device, can solve problems such as engineering constraints and geometric consistency constraints that are difficult to meet, and achieve the effect of solving engineering constraints and ensuring fitting accuracy

Inactive Publication Date: 2019-03-01
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

It uses the Free Form Deformation (FFD) method to parameterize the three-dimensional high-lift device, and fits complex geometric shapes with high precision, solving the problem that engineering constraints and geometric consistency constraints are difficult to meet

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  • A three-dimensional lifting device parameterization method meeting engineering constraints based on an FFD method
  • A three-dimensional lifting device parameterization method meeting engineering constraints based on an FFD method
  • A three-dimensional lifting device parameterization method meeting engineering constraints based on an FFD method

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Embodiment Construction

[0043] The embodiments of the present invention will be described in detail below, and the examples of the embodiments are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0044] In this embodiment, a parameterization method of a three-dimensional high-lift device that satisfies engineering constraints based on the FFD method includes the following steps:

[0045] Step 1: Measure the slat deflection angle, slat rotation axis position, flap deflection angle and flap rotation axis position in the initial configuration of the three-dimensional high-lift device.

[0046] Step 2: In the initial configuration ( figure 1 As shown), the control frame is arranged on the slats and flaps, and the area surrounded by the control frame is: when the high-lift device is in the stowed state, the area of ​​the slats and flaps overlapping with the main wing ( figure 2 , 3, 4); the following steps are used to process each...

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Abstract

The invention provides a three-dimensional augmentation device parameterization method meeting engineering constraints based on an FFD method, and the method comprises the steps: firstly, measuring the position parameters of a three-dimensional augmentation device, arranging a control frame on a slat and a flap of an initial configuration, carrying out parameterization disturbance on the object surface in the control frame, and changing the geometric shapes of the slat and the flap in the control frame; Reversing a control frame arranged on the initial configuration slat and the flap to the main wing according to the position parameters to obtain local coordinates of corresponding object plane grid points on the main wing in the corresponding control frame; and reversing the deformed control frame on the slat and the flap to the main wing according to the position parameters to obtain a global coordinate vector after the corresponding object plane grid point on the main wing is deformed. According to the method, the FFD method is used for guaranteeing the fitting precision of the geometric shape of the lifting device, the intersection interface part of the main wing in the method is processed, the geometric consistency constraint is met, finally, the generated three-section wing shape is subjected to fixed-axis rotation and translation operation, and the engineering constraintproblem is solved.

Description

technical field [0001] The invention relates to a parameterization method of a three-dimensional high-lift device satisfying engineering constraints based on an FFD method, and belongs to the technical field of aircraft design. Background technique [0002] High-lift devices have a significant impact on the size, tonnage, economy and safety of most transport aircraft. For contemporary typical large-scale twin-engine transport aircraft, a small improvement in the aerodynamic characteristics of the high-lift device can obtain a large benefit in the overall performance of the whole aircraft. [0003] Because the flow mechanism of the high-lift device is extremely complex, the design of the high-lift device in the project has been mainly relying on the experience of engineers and a large number of wind tunnel tests for a long time. The early high-lift devices mainly obtained better aerodynamic performance by increasing the number of stages of the high-lift device, but at the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/15
Inventor 张煜白俊强
Owner NORTHWESTERN POLYTECHNICAL UNIV
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