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Definition of Commonly Used Day Types (Atmospheric Ambient Temperature Characteristics Versus Pressure Altitude)

S-15 Gas Turbine Perf Simulation Nomenclature and Interfaces
  • Aerospace Standard
  • AS210
  • Current
Published 2018-11-07 by SAE International in United States
“Hot Day”, “Tropical Day”, “Standard Day”, “Polar Day”, and “Cold Day” are part of the lexicon of the aircraft industry. These terms are generally understood to refer to specific, generally accepted characteristics of atmospheric temperature versus pressure altitude. There are also other, less well-known days, defined by their frequency of occurrence, such as “1% Hot Day”, “10% Cold Day”, or “Highest Recorded Day”. These temperature characteristics have their origins in multiple sources, including U.S. military specifications which are no longer in force.
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Gas Turbine Engine Performance Presentation and Nomenclature For Object-Oriented Computer Programs

S-15 Gas Turbine Perf Simulation Nomenclature and Interfaces
  • Aerospace Standard
  • ARP5571C
  • Current
Published 2018-05-07 by SAE International in United States
This document provides recommendations for several aspects of air-breathing gas turbine engine performance modeling using object-oriented programming systems. Nomenclature, application program interface, and user interface are addressed with the emphasis on nomenclature. The Numerical Propulsion System Simulation (NPSS) modeling environment is frequently used in this document as an archetype. Many of the recommendations for standards are derived from NPSS standards. NPSS was chosen because it is an available product. The practices recommended herein may be applied to other object-oriented systems. While this document applies broadly to any gas turbine engine, the great majority of engine performance computer programs have historically been written for aircraft propulsion systems. Aircraft and propulsion terminology and examples appear throughout.
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Gas Turbine Engine Interface Test Data Reduction Computer Programs

S-15 Gas Turbine Perf Simulation Nomenclature and Interfaces
  • Aerospace Standard
  • ARP1210E
  • Current
Published 2017-11-21 by SAE International in United States
This SAE Aerospace Recommended Practice (ARP) describes a class of digital computer programs for use by organizations other than the engine supplier for reduction of engine test data relating to the interface of the engine in the airframe or test facility. This ARP also is intended as a guide for the preparation of such computer programs.

Function-Based API for Gas Turbine Engine Performance Programs

S-15 Gas Turbine Perf Simulation Nomenclature and Interfaces
  • Aerospace Standard
  • ARP4868C
  • Current
Published 2016-08-01 by SAE International in United States
The SAE Aerospace Standard document AS681 is the parent document of this SAE Aerospace Recommended Practice (ARP). AS681 applies to Engine programs written to conform to this document. This ARP specifies a set of functions and their expected behaviors that constitute a function based Application Program Interface (API) for gas turbine engine customer programs. The functions specified in this API are delivered by the Supplier as part of the Engine model. This document defines generic language independent functions and specific appendices for implementations in C and Fortran. The function based API specified in this ARP represents an alternative to the Fortran COMMON block structure, as specified in AS4191, historically used to communicate with an engine program. The customer may request emulation of the AS4191 interface if desired. This document does not specify how the parameter names in the Engine program are constructed, how program capabilities might be expanded or altered, or how error messages are constructed. See AS6502 for overall guidelines for nomenclature. See ARP5571 for information on nomenclature, expanding program operational capabilities and generating…
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Gas Turbine Engine Performance Presentation for Computer Programs

S-15 Gas Turbine Perf Simulation Nomenclature and Interfaces
  • Aerospace Standard
  • AS681K
  • Current
Published 2016-06-06 by SAE International in United States
This SAE Aerospace Standard (AS) provides the method for presentation of gas turbine engine steady-state and transient performance calculated using computer programs. It also provides for the presentation of parametric gas turbine data including performance, weight, and dimensions computed by computer programs. This standard is intended to facilitate calculations by the program user without unduly restricting the method of calculation used by the program supplier. This standard is applicable to, but not limited to the following program types: data reduction, steady-state, transient, preliminary design, study, specification, status, and parametric programs.
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Gas Turbine Engine Performance Presentation for Computer Programs Using Fortran

S-15 Gas Turbine Perf Simulation Nomenclature and Interfaces
  • Aerospace Standard
  • AS4191A
  • Current
Published 2015-10-29 by SAE International in United States
This SAE Aerospace Standard (AS) provides a method for gas turbine engine performance computer programs to be written using Fortran COMMON blocks. If a “function-call application program interface” (API) is to be used, then ARP4868 and ARP5571 are recommended as alternatives to that described in this document. When it is agreed between the program user and supplier that a particular program shall be supplied in Fortran, this document shall be used in conjunction with AS681 for steady-state and transient programs. This document also describes how to take advantage of the Fortran CHARACTER storage to extend the information interface between the calling program and the engine subroutine.
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Gas Turbine Engine Real Time Performance Model Presentation

S-15 Gas Turbine Perf Simulation Nomenclature and Interfaces
  • Aerospace Standard
  • ARP4148C
  • Current
Published 2015-03-09 by SAE International in United States
This SAE Aerospace Recommended Practice (ARP) provides guidance for the presentation of gas turbine engine transient performance models with the capacity to be implemented as computer programs operating in real time and is intended to complement AS681. Such models will be used in those applications where a transient program must interface with physical systems. These applications are characterized by the requirement for real time transient response. These models require attention to unique characteristics that are beyond the scope of AS681. This document is intended to facilitate the development of mathematical models and the coordination of their requirements with the user. It will not unduly restrict the modeling methodology used by the supplier. The objective of this document is to define a recommended practice for the delivery of mathematical models intended for real time use. Models used in this application may also be contained in deliverable computer programs covered by AS681.
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Aircraft Propulsion System Performance Nomenclature

S-15 Gas Turbine Perf Simulation Nomenclature and Interfaces
  • Aerospace Standard
  • AS6502
  • Current
Published 2015-01-15 by SAE International in United States
This SAE Aerospace Standard (AS) provides classical propulsion system performance parameter names for aircraft propulsion systems and their derivatives, and describes the logical framework by which new names can be constructed.
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Definition of Commonly Used Day Types (Atmospheric Ambient Temperature Characteristics Versus Pressure Altitude)

S-15 Gas Turbine Perf Simulation Nomenclature and Interfaces
  • Aerospace Standard
  • ARP210A
  • Current
Published 2014-12-18 by SAE International in United States
"Hot Day ", "Tropical Day ", "Standard Day ", "Polar Day " and "Cold Day " are part of the lexicon of the aircraft industry. These terms are generally understood to refer to specific, generally accepted characteristics of atmospheric temperature versus pressure altitude. There are also other, less well-known days, defined by their frequency of occurrence, such as "1% Hot Day ", "10% Cold Day ", or "Highest Recorded Day ". These temperature characteristics have their origins in multiple sources, including U.S. military specifications which are no longer in force.

Aircraft Propulsion System Performance Station Designation

S-15 Gas Turbine Perf Simulation Nomenclature and Interfaces
  • Aerospace Standard
  • AS755F
  • Current
Published 2014-12-12 by SAE International in United States
This SAE Aerospace Standard (AS) provides a performance station designation system for aircraft propulsion systems and their derivatives.
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