Method for automotive vehicle body shape design

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364578, G06F 1750

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active

058779680

ABSTRACT:
A method for designing an automotive vehicle body shape having fixed and free boundaries to meet a pre-specified velocity or pressure distribution for a portion of the vehicle body migrates a set of vortex elements, whose strengths are related to the desired velocity and pressure distributions, until they reach spatial positions consistent with the desired velocity and pressure profile. A desired velocity and pressure profile is specified for a first portion and a shape is specified for a second portion of the vehicle body, and an initial shape for the first portion is estimated having a free surface cross-section, which is divided into free surface elements. Free surface vorticies are assigned in one-to-one correspondence to the free surface elements, and fixed surface vorticies in one-to-one correspondence with the fixed surface elements are determined. For each of the free surface elements, an x-axis velocity component and a y-axis velocity component is determined based upon the free surface vorticies and the fixed surface vorticies. These velocity components are then used to realign the planar orientation of each of the plurality of free surface elements. Determination of new x-axis and y-axis velocity components and realignment of the free surface cross-section continues until each of the free surface elements is within a predetermined tolerance.

REFERENCES:
patent: 5458304 (1995-10-01), Gilbert
patent: 5544524 (1996-08-01), Huyer et al.
"Method of simulating structural dynamics" by A. Clymer, Simulation--The Dynamic Modeling of Ideas and Systems with Computers, McGraw-Hill Book Company, 1968, pp. 49-64.
"Modal simulation of unidirectional fluid dynamics" by A Childs, Simulation-The Dynamic Modeling of Ideas and Systems with Computers, McGraw-Hill Book Company, 1968, pp. 133-143.
"Dynamics of a rotating space station" by W. Polstorff, Simulation--The Dynamic Modeling of Ideas and Systems with Computers. McGraw-Hill Book Company, 1968, pp. 144-159.
"A Method for Invere Aerofoil and Cascade Design by Surface Vorticity", Gas Turbine Division of the ASME, R.I. Lewis (82-GT-1540).

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