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  • 1
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    HYTESS: A hypothetical turbofan engine simplified simulation (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A users manual for a hypothetical turbofan engine simplified simulation is presented. This digital simulation exists as FORTRAN source code. The program is self-contained and was developed to offer those interested in engine dynamics and controls research an efficient, realistic, and easily used engine simulation. The engine is modeled using a state space formulation. Matrix elements within the linear state space structure are nonlinear functions of various engine variables.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA-TM-83561 , E-1940 , NAS 1.15:83561
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Sensor failure detection system (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Advanced concepts for detecting, isolating, and accommodating sensor failures were studied to determine their applicability to the gas turbine control problem. Five concepts were formulated based upon such techniques as Kalman filters and a screening process led to the selection of one advanced concept for further evaluation. The selected advanced concept uses a Kalman filter to generate residuals, a weighted sum square residuals technique to detect soft failures, likelihood ratio testing of a bank of Kalman filters for isolation, and reconfiguring of the normal mode Kalman filter by eliminating the failed input to accommodate the failure. The advanced concept was compared to a baseline parameter synthesis technique. The advanced concept was shown to be a viable concept for detecting, isolating, and accommodating sensor failures for the gas turbine applications.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA-CR-165515 , PWA-5736-17
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 3
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    Sensor failure detection for jet engines (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Revisions to the advanced sensor failure detection, isolation, and accommodation (DIA) algorithm, developed under the sensor failure detection system program were studied to eliminate the steady state errors due to estimation filter biases. Three algorithm revisions were formulated and one revision for detailed evaluation was chosen. The selected version modifies the DIA algorithm to feedback the actual sensor outputs to the integral portion of the control for the nofailure case. In case of a failure, the estimates of the failed sensor output is fed back to the integral portion. The estimator outputs are fed back to the linear regulator portion of the control all the time. The revised algorithm is evaluated and compared to the baseline algorithm developed previously.
    Keywords: QUALITY ASSURANCE AND RELIABILITY
    Type: NASA-CR-168190 , NAS 1.26:168190 , PWA-5891-18
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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