Accession Number:

ADA128497

Title:

Elements of Simulation Error Analysis.

Descriptive Note:

Final rept. 2 Mar 81-22 Feb 82,

Corporate Author:

SYSTEMS TECHNOLOGY INC HAWTHORNE CA

Personal Author(s):

• Whitbeck,Richard F.

Report Date:

1982-06-01

Pagination or Media Count:

183.0

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. Author

Descriptors:

• *ALGORITHMS
• *ERROR ANALYSIS
• *AIRCRAFT MODELS
• *DIGITAL SIMULATION
• ANOMALIES
• CONTROL SYSTEMS
• COMPUTATIONS
• CASE STUDIES
• SUBROUTINES
• SKEWNESS
• SWITCHING
• FREQUENCY RESPONSE
• CLOSED LOOP SYSTEMS
• SERIAL PROCESSORS

Subject Categories:

• Aircraft
• Theoretical Mathematics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE