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  • 1
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    Sensor failure detection for jet engines (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The use of analytical redundancy to improve gas turbine engine control system reliability through sensor failure detection, isolation, and accommodation is surveyed. Both the theoretical and application papers that form the technology base of turbine engine analytical redundancy research are discussed. Also, several important application efforts are reviewed. An assessment of the state-of-the-art in analytical redundancy technology is given.
    Keywords: AIRCRAFT PROPULSION AND POWER
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  • 2
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    Turbofan engine demonstration of sensor failure detection (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: In the paper, the results of a full-scale engine demonstration of a sensor failure detection algorithm are presented. The algorithm detects, isolates, and accommodates sensor failures using analytical redundancy. The experimental hardware, including the F100 engine, is described. Demonstration results were obtained over a large portion of a typical flight envelope for the F100 engine. They include both subsonic and supersonic conditions at both medium and full, nonafter burning, power. Estimated accuracy, minimum detectable levels of sensor failures, and failure accommodation performance for an F100 turbofan engine control system are discussed.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Journal of Guidance, Control, and Dynamics (ISSN 0731-5090); 14; 337-349
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  • 3
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    An intelligent control system for rocket engines - Need, vision, and issues (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Several components of intelligence are defined. Within the context of these definitions an intelligent control system for rocket engines is described. The description includes a framework for development of an intelligent control system, including diagnostics, coordination, and direct control. Some current results and issues are presented.
    Keywords: CYBERNETICS
    Type: IEEE Control Systems Magazine (ISSN 0272-1708); 11; 42-46
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  • 4
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    State space representation of the open-loop dynamics of the Space Shuttle Main Engine (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A parameter and structure estimation technique for multivariable systems is used to obtain state space representation of open loop dynamics of the Space Shuttle Main Engine (SSME). The parameterization being used is both minimal and unique. The simplified linear models may be used for fault detection studies and control system design and development.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: ASME, Transactions, Journal of Dynamic Systems, Measurement, and Control (ISSN 0022-0434); 113; 684-690
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  • 5
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    Life extending control: An interdisciplinary engineering thrust (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The concept of Life Extending Control (LEC) is introduced. Possible extensions to the cyclic damage prediction approach are presented based on the identification of a model from elementary forms. Several candidate elementary forms are presented. These extensions will result in a continuous or differential form of the damage prediction model. Two possible approaches to the LEC based on the existing cyclic damage prediction method, the measured variables LEC and the estimated variables LEC, are defined. Here, damage estimates or measurements would be used directly in the LEC. A simple hydraulic actuator driven position control system example is used to illustrate the main ideas behind LEC. Results from a simple hydraulic actuator example demonstrate that overall system performance (dynamic plus life) can be maximized by accounting for component damage in the control design.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: Structural Integrity and Durability of Reusable Space Propulsion Systems; p 229-237
    Format: application/pdf
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  • 6
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    A real time microcomputer implementation of sensor failure detection for turbofan engines (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: An algorithm was developed that detects, isolates, and accommodates sensor failures using analytical redundancy. The performance of this algorithm has been demonstrated on a full-scale F100 turbofan engine. The algorithm was implemented in real-time on a microprocessor-based controls computer which includes parallel processing and high order language programming. Parallel processing was used to achieve the required computational power for the real-time implementation. High order language programming was used in order to reduce the programming and maintenance costs of the algorithm implementation software. The sensor failure algorithm was combined with an existing multivariable control algorithm to give a complete control implementation with sensor analytical redundancy. The real-time microprocessor implementation of the algorithm, which resulted in the successful completion of the algorithm engine demonstration, is described.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: IEEE Control Systems Magazine (ISSN 0272-1708); 10; 29-37
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  • 7
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    Advanced detection, isolation, and accommodation of sensor failures - Real-time evaluation (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The objective of the Advanced Detection, Isolation, and Accommodation (ADIA) program is to improve the overall demonstrated reliability of digital electronic control systems for turbine engines by using analytical redundancy to detect sensor failures. The results of a real-time hybrid computer evaluation of the ADIA algorithm are presented. Minimum detectable levels of sensor failures for an F100 engine control system are determined. Also included are details about the microprocessor implementation of the algorithm as well as a description of the algorithm itself.
    Keywords: AIRCRAFT STABILITY AND CONTROL
    Type: Journal of Guidance, Control, and Dynamics (ISSN 0731-5090); 11; 517-526
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  • 8
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    Full-scale engine demonstration of an advanced sensor failure detection, isolation and accommodation algorithm: Preliminary results (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The objective of the advanced detection, isolation, and accommodation (ADIA) program is to improve the overall demonstrated reliability of digital electronic control systems for turbine engines. For this purpose, algorithms were developed which detect, isolate, and accommodate sensor failures using analytical redundancy. Preliminary results of a full scale engine demonstration of the ADIA algorithm are presented. Minimum detectable levels of sensor failures for an F100 turbofan engine control system are determined and compared to those obtained during a previous evaluation of this algorithm using a real-time hybrid computer simulation of the engine.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: NASA-TM-89880 , E-3561 , NAS 1.15:89880 , AIAA PAPER 87-2259
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  • 9
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    Advanced detection, isolation and accommodation of sensor failures: Real-time evaluation (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The objective of the Advanced Detection, Isolation, and Accommodation (ADIA) Program is to improve the overall demonstrated reliability of digital electronic control systems for turbine engines by using analytical redundacy to detect sensor failures. The results of a real time hybrid computer evaluation of the ADIA algorithm are presented. Minimum detectable levels of sensor failures for an F100 engine control system are determined. Also included are details about the microprocessor implementation of the algorithm as well as a description of the algorithm itself.
    Keywords: AIRCRAFT STABILITY AND CONTROL
    Type: NASA-TP-2740 , E-3479 , NAS 1.60:2740
    Format: application/pdf
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  • 10
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    Damage-mitigating control of aerospace systems for high performance and extended life (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The concept of damage-mitigating control is to minimize fatigue (as well as creep and corrosion) damage of critical components of mechanical structures while simultaneously maximizing the system dynamic performance. Given a dynamic model of the plant and the specifications for performance and stability robustness, the task is to synthesize a control law that would meet the system requirements and, at the same time, satisfy the constraints that are imposed by the material and structural properties of the critical components. The authors present the concept of damage-mitigating control systems design with the following objectives: (1) to achieve high performance with a prolonged life span; and (2) to systematically update the controller as the new technology of advanced materials evolves. The major challenge is to extract the information from the material properties and then utilize this information in a mathematical form so that it can be directly applied to robust control synthesis for mechanical systems. The basic concept of damage-mitigating control is illustrated using a relatively simplified model of a space shuttle main engine.
    Keywords: CYBERNETICS
    Type: In: 1992 American Control Conference, 11th, Chicago, IL, June 24-26, 1992, Proceedings. Vol. 4 (A93-22776 07-63); p. 3052-3056.
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