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Elements of Simulation Error Analysis

Report Number: AFWAL-TR-82-3022
Author(s): Whitbeck, Richard F.
Corporate Author: Systems Technology, Inc.
Corporate Report Number: TR-1173-1
Laboratory: Flight Dynamics Laboratory
Date of Publication: 1982-06
Pages: 183
Contract: F33615-81-C-3606
Project: 2304
Task: 2304N3
AD Number: ADA128497

Abstract:
The past decade has seen an order-of-magnitude increase in reliance on fixed and moving based digital simulation for research and training in all types of aircraft. Along with this increase there has been a growing need to identify and analyze those anomalies introduced by digital computation which can adversely affect the fidelity of a simulation. Those anomalies arise for a variety of reasons, the most important being: (1) two or more computers required in a large simulation, each working in its own frametime, (2) serial processing (calling) of subroutines which can cause skewed or stale data effects, (3) throughput delays, and (4) effects of various integration algorithms. This report develops several key tools useful for the analysis of computer algorithms working in a skewed data, multi-rate environment and thus makes it possible to analytically investigate the anomalies mentioned above. Toward this end, numerous case studies, based upon existing computer simulations, are presented which specifically treat the independent processor problem and the unintentional filtering introduced by the serial call of subroutines.

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