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Time-Dependent In-Flight Thrust Determination
- Aerospace Standard
- AIR5020A
- Stabilized
Downloadable datasets available
Annotation ability available
Sector:
Issuing Committee:
Language:
English
Scope
The purpose and intent of Subcommittee E-33E’s effort, the reporting objectives, and the limitations inherent in the reported findings and recommendations are reviewed since these factors are the basis of the information contained in this document.
SAE E-33E Subcommittee was formed to assess the level of industry experience that exists in the area of thrust determination during aircraft time-variant operating conditions. A prime objective was to provide a center for gathering expertise and to be a forum for the exchange of ideas and viewpoints. The committee recognized that a practice for the rigorous treatment of time-dependent thrust did not exist and that several critical aspects of its accounting would need to be investigated.
The specific objectives of this document are:
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a
To examine aircraft and engine operating conditions under which the quasi-steady thrust assumption is valid.
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b
To determine the extent to which time-dependent (nonstationary) force accounting for engine net thrust and propulsion system throttle-dependent terms is required, consistent with existing and developing thrust-minus-drag techniques.
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c
To report time-dependent thrust methodologies and measurement techniques used for flight and ground testing.
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d
To present the results of a data review of state-of-the-art methodology appropriate to the determination of aircraft-installed thrust during quasi-steady and dynamic maneuvers.
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e
To provide guidelines for validating and improving time-dependent thrust determination as appropriate to a specific program.
Rationale
The overall objectives and approach described in this document were intended to provide guidance and benchmarking. Readers may refer to this approach and practice guidance for application, comparison, or extension to their specific related tasks, using the appropriate technical data, requirements and the most current applicable references. The general approach and guidance are considered stable in regards to the above stated intent.
Topic
Data Sets - Support Documents
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| TABLE 1A | Roman | |
| TABLE 1B | Greek | |
| TABLE 1C | Subscripts | |
| TABLE 2 | Aircraft Quasi-Steady Threshold Limits (Fixed Throttle) | |
| TABLE 3 | Summary of Test Facility Simulation and Transient Capabilities | |
| TABLE 4A | Typical Gas Path Methods Instrumentation (Nonafterburning Engine with Constant Area Exhaust Nozzle) | |
| TABLE 4B | Typical Gas Path Methods Instrumentation (Nonafterburning Engine with Variable Area Exhaust Nozzle) | |
| TABLE 4C | Typical Gas Path Methods Instrumentation (Afterburning Engine with Variable Area Exhaust Nozzle) | |
| TABLE 5A | Transient Simulation Method Instrumentation (Nonafterburning Engine with Constant Area Exhaust Nozzle) | |
| TABLE 5B | Transient Simulation Method Instrumentation (Nonafterburning Engine with Variable Area Exhaust Nozzle) | |
| TABLE 5C | Transient Simulation Method Instrumentation (Afterburning Engine) | |
| TABLE 6 | Excess Thrust Measurement Method Instrumentation | |
| TABLE 7 | Typical Accelerometer Ranges and Uncertainties | |
| TABLE 8 | Typical Altitude Facility Instrumentation Uncertainty | |
| TABLE 9 | Typical Flight Test Instrumentation Uncertainty for Steady-State Data | |
| TABLE 10 | Flight Test Maneuvers | |
| Unnamed Dataset 25 | ||
| Unnamed Dataset 26 |
Issuing Committee
E-33 In Flight Propulsion Measurement Committee
Reviews industry experience and state-of-the-art on in-flight thrust, meassurement and its uncertainty, including ASME, ISO, MIDAP, USAF, JANNAF, and NIST methods - including sources of error. Determines whether there is a basis to support development of a procedure for determing uncertainty, and review methods of measuring in-flight thrust. from possible drafting of information documents. Produces several SAE Aerospace Information Reports on Determination of In-Flight Thrust and Measurement Uncertainty of In-Flight Thrust Determination.
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