Aircraft pilot outside world view charting technique

Аuthors

Gelvig M. Y.

National Helicopter Center Mil & Kamov, 26/1, Garshina str., Tomilino, Moscow region, 140070, Russia

e-mail: mgelvig@mi-helicopter.ru

Abstract

Sufficient outside world view fr om pilot’s flight station is one of the essential conditions of the safe and comfortable aircraft piloting, including a helicopter.

Horizontal and vertical look-up angles from the basic directional point C explicit numerical values are specified by regulatory documents, and by FAR-29 Aviation regulations in particular. The viewing field (VF) is usually represented for clarity in the form of chart , plotted in rectangular coordinate system, wh ere and  are respectively vertical and horizontal VF angles. Openings outlines presented in rectangular coordinate system should closely comply with normative chart.

Conventional view assessment methods, including measuring ones (in-situ and virtual with 3D-model), are considerably labor consuming, as they require a lot of measured results manual processing. Besides, with the input data alteration (such as basic directional point C position) all measurements must be repeated.

The previous effort of this problem solution automation by means of 3D CAD Solid Works system resulted in successful graphic solution of VF plotting in polar coordinates. However, geometry conversion to rectangular coordinate system with the CAD system failed. To that end, an algorithm employing specially designed software was implemented. It led to the desired result. Nevertheless, the complexity of such solution makes this technique implementation quite a problem.

The objective of the effort presented in the paper was the outside world view VF plotting graphic technique with only basic 3D CAD system available in the Company.

The most challenging task while this technique developing was geometry convertion from polar to rectangular coordinates. This problem was solved in CAD NX 8.5 by successive projections on auxiliary vertical and horizontal cylinders with subsequent unfolding of these projections on plane. As a result, we have obtained a field of vision plot in rectangular coordinates. All constructions are fully associative. With input data alteration, the geometry reshapes automatically.

We managed to solve the problem of normative field of vision boundaries on the crew cabins’ surface determination, based on reverse projection combinations VF normative field of vision boundaries convolutions in rectangular coordinate system.

Keywords:

field of vision plot, basic viewing point, graphical plotting method, 3D CAD system

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