Two-dimensional high lift device parametrization design method based on NURBS curve and meeting engineering constraints

A technology of increasing lift device and curve, which is applied in the field of parametric design of two-dimensional increasing device to achieve the effect of ensuring the fitting accuracy

Inactive Publication Date: 2017-09-29
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

Judging from the published patents at home and abroad, some existing parameterization methods still have certain problems in the processing of high-lift devices

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  • Two-dimensional high lift device parametrization design method based on NURBS curve and meeting engineering constraints
  • Two-dimensional high lift device parametrization design method based on NURBS curve and meeting engineering constraints
  • Two-dimensional high lift device parametrization design method based on NURBS curve and meeting engineering constraints

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Embodiment Construction

[0024] 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.

[0025] This embodiment is based on the free-form surface curve deformation theory, using the parameterization method of NURBS curves, and proposes a parametric design method of a two-dimensional high-lift device based on NURBS curves that satisfies engineering constraints, specifically including the following steps:

[0026] Step 1: Based on figure 1 The two-dimensional cruising airfoil of the design shown in Fig. The control nodes are arranged on the interface of the main wing, and the slat control points and flap control points are arranged as follows: figure 2 , image 3 shown; and determine the slat deflection angle, slat rotation axis position, flap deflection angle and flap rotation axis position according to the aerodynamic de...

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Abstract

The invention provides a two-dimensional high lift device parametrization design method based on an NURBS curve and meeting engineering constraints. Firstly, the positions of slat and main wing interfaces and flap and main wing interfaces are determined on a two-dimensional airfoil profile, and control nodes are arranged, deflection angles of slats and flaps and rotary shaft positions are determined according to aerodynamic design requirements; secondly, the control nodes are respectively fitted to obtain geometric profiles of the slat and main wing interfaces and the flap and main wing interfaces; thirdly, intersection points of the interfaces and the two-dimensional airfoil profile are found again and are utilized to split the two-dimensional airfoil profile, the geometric profiles of the interfaces are spliced with the split two-dimensional airfoil profile to form slat profiles, flap profiles and main wing profiles; finally, according to the deflection angles of the slats and flaps and rotary shaft positions, fixed-shaft rotation is conducted on the slats and flaps to obtain a high lift device profile. The method adopts a non-uniform rational B-spline method to parametrize a two-dimensional high lift device, a complicated geometric profile is fit at higher precision, and the problem that the engineering constraints and geometrical consistency constraints are difficult to meet is solved.

Description

technical field [0001] The invention relates to the technical field of aircraft design, in particular to a parametric design method of a two-dimensional high-lift device that satisfies engineering constraints based on NURBS curves. 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 th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/15Y02T90/00
Inventor 张煜白俊强刘南
Owner NORTHWESTERN POLYTECHNICAL UNIV
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