850. Automated Method for Calculating Mass Characteristics of Fuel in Tanks at Various Angles of Attack
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Paper
Abstract
(This paper is taken from a report entitled ‘Automated Weight Control’ which resulted from Avco’s IRAD effort.) An automated process for the calculation of mass properties for fuel volumes is the subject for this paper. The tank shapes are such that they can be approximated by subdividing into tapered boxes with straight line edges. The data are calculated for levels incremented every .25 inches and oriented at any angle of attack. The mass properties consist of total weight, three axis center of gravity and moment of inertia (LB. – IN. 2) and a product of inertia in the X-Z plane. The input consists of coordinates for the tapered box corner points, the Z intercepts for planes oriented at the angle of attack and passing through the lowest and highest corners in the box, the Z intercept for the initial cutting plane, the angle of attack with its tangent plus the tangent for twice the angle of attack, fuel density and an indicator to signal program termination. Special use is made of the prismoidal equation (Reference: SAWE Handbook, Page 4.2.8
