Single-curved surface wind screen nose integrated design method

Abstract

The invention belongs to the field of design of airplanes, and particularly relates to a single-curved surface wind screen nose integrated design method. The single-curved surface wind screen nose integrated design method comprises the following steps: extracting Catia forming parameters via design constraints of a nose, and establishing a nose parameterization surface model and generating curved surfaces in the following order: generating an upper main curved surface of one side of the nose, cutting the wind screen area of the upper main curved surface, generating a main wind screen curved surface firstly and then generating a lateral wind screen curved surface in the wind screen area, generating a transition curved surface between the main wind screen curved surface and the remaining upper main curved surface after the wind screen area is cut, generating an upper front curved surface on one side of the nose, and sequentially generating remaining curved surfaces, including a lower main curved surface, a lower rear curved surface and a lower front curved surface, on one side of the nose, and symmetrically generating curved surfaces of the other side of the nose. As the upper main curved surfaces are integratedly generated in the cutting manner, high order and continuity in curvature of the upper main curved surfaces are ensured, and integrated manufacturing is faciliated; in addition, the nose is enabled to have good aerodynamic characteristics and flow quality, so that oil consumption is reduced.

Description

technical field [0001] The invention relates to a method for designing an aircraft nose, in particular to an integrated design method for a single curved windshield nose, through which a streamlined nose with good aerodynamic characteristics can be designed. Background technique [0002] For the design of the nose of a civil aircraft, many inherent constraints need to be met, such as the external view of the cockpit, the driver's activity space and other ergonomic requirements; Frame, floor, wall panel, interior decoration and other structural parts layout space requirements, etc. Under the premise of satisfying the above constraints, the nose design should pursue the optimal aerodynamic characteristics. [0003] For the nose of an aircraft, the main curve on the windshield of the cockpit has a crucial influence on the flow quality of the entire nose. This place is above the driver's head. The installation of the top plate in the cockpit and the structural height constrain...

AI Technical Summary

Problems solved by technology

Its advantage is that the influence of refraction and visual deformation is minimal, and the cost of the plane windshield is low. The disadvantage is that the flow characteristics at the windshield are poor, and because the main curved surface b on the nose is protruding, the curvature is large, and the transition surface between the plane (windshield) and the curved surface The quality is poor, so that the airflow passing through here accelerates faster, and it is easy to produce a supersonic zone, and there will be two stagnation points at the nose c of the nose, and the aerodynamic resistance is large

In addition, due to the discontinuity of the curved surface of the machine head, it is difficult to transition the curved surface, and the manufacturing process is also relatively complicated.

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