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Propulsion System Flow Stability Program (Dynamic). Part XVII. Propulsion System Simulation Digital Computer Program Format and Routines

Report Number: AFAPL TR 68-142 Part XVII
Author: Kaplan, Earl H.
Author: Wong, Heeman W.
Corporate Author: North American Rockwell Corp Los Angeles CA Los Angeles Div
Laboratory: Air Force Aero Propulsion Laboratory
Date of Publication: 1968-12
Pages: 137
Contract: F33615-67-C-1848
AD Number: AD0859282

The primary objective of Task 7 of the "Propulsion System Flow Stability Program" was to develop a simulation program to be used in Phase II for the evaluation of two control systems capable of sensing and accommodating a transient condition. Since the work on this task was being performed by three companies, every effort was made to insure compatibility in terminology, units, and program documentation as well as to provide means of communicating the myriad details involved in making computer runs of the system. This documentation format is described in Section II of this volume. An early element of this task was the selection of a simulation language for use in programming the simulation. The choice of IBM's DSL/90 and the factors involved in making that choice are discussed in Section III. Simulation programs have a natural tendency to be rather voluminous and, when the system being simulated is as complex as a supersonic inlet, turbofan, and an integrated control system can be, computer storage space is rapidly filled. To alleviate this crowding, numerous logic blocks which were repetitive, such as compressor logic, were removed from the simulation logic deck and made into subroutines or functions. These subprograms are discussed in Section IV. Once the simulation logic is written, the most difficult task of all begins. The job of initialization is usually not given proper emphasis until many hours of work have convinced all concerned that it is really the most important phase. Section V discusses this task and shows an example of an initialization routine.

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