Integrated design method of hyperbolic windshield nose

Abstract

The invention belongs to the field of airplane design and particularly relates to a design method for an integrated double-curve windshield nose. The method includes the following steps: 1.0, extracting Catia forming parameters according to nose design constraint; and 2.0, building a nose parameterization curve mode. Curved face generating sequences are as follows: 2.1, an upper curved face ABDF comprising a windshield area is generated on one side of the nose; 2.2, a lower curved face DGHE is generated on one side of the nose; 2.3, generating a lower rear curved face EHIF on one side of the nose; 2.4, generating curved faces BCD and CGD on a nose portion of one side of the nose; and 2.5, generating various curved faces on the other side of the nose, and the curved faces on the other side of the nose are symmetrical with curved faces generated in the step 2.1 to 2.4 and arranged on one side of the nose respectively. By generating the upper main curved face comprising the windshield area integrally, curvature high-order continuation of the upper main curved face is guaranteed, and integrated manufacture is facilitated. Simultaneously, the nose has good aerodynamic characteristics and flow quality, and 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 hyperbolic 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 constraints ...

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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