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  • 1
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    Experimental results using active control of traveling wave power flow (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Active structural control experiments conducted on a 24-ft pinned-free beam derived feedback compensators on the basis of a traveling-wave approach. A compensator is thus obtained which eliminates resonant behavior by absorbing all impinging power. A causal solution is derived for this noncausal compensator which mimics its behavior in a given frequency range, using the Wiener-Hopf. This optimal Wiener-Hopf compensator's structure-damping performance is found to exceed any obtainable by means of rate feedback. Performance limitations encompassed the discovery of frequencies above which the sensor and actuator were no longer dual and an inadvertent coupling of the control hardware to unmodeled structure torsion modes.
    Keywords: STRUCTURAL MECHANICS
    Type: Journal of Guidance, Control, and Dynamics (ISSN 0731-5090); 14; 350-359
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Active impedance matching of complex structural systems (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Viewgraphs on active impedance matching of complex structural systems are presented. Topics covered include: traveling wave model; dereverberated mobility model; computation of dereverberated mobility; control problem: optimal impedance matching; H2 optimal solution; statistical energy analysis (SEA) solution; experimental transfer functions; interferometer actuator and sensor locations; active strut configurations; power dual variables; dereverberation of complex structure; dereverberated transfer function; compensators; and relative power flow.
    Keywords: STRUCTURAL MECHANICS
    Type: The 3rd Annual Controlled Structures Technology Symposium; 19 p
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    The Middeck Active Control Experiment (MACE) (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Viewgraphs on the Middeck Active Control Experiment (MACE) are presented. Topics covered include: science program objectives and rationale; science requirements; capturing the essential physics; science development approach; development model hardware; development model test plan; and flight hardware and operations.
    Keywords: STRUCTURAL MECHANICS
    Type: The 3rd Annual Controlled Structures Technology Symposium; 24 p
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    The Middeck Active Control Experiment (MACE) (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Viewgraphs on the Middeck Active Control Experiment (MACE) are presented. Topics covered include: program objectives; program features; flight experiment features; current activities; MACE development model lab testing; MACE test article deployed on STS middeck; and development model testing.
    Keywords: STRUCTURAL MECHANICS
    Type: Controlled Structures Technology Steering Committee Workshop; 14 p
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Forward Swept Compressor Testing (1997)
    In:  CASI
    Details
    Publication Date: 2018-06-05
    Description: A new forward-swept rotor designed by Allison Engine Company was tested in NASA Lewis Research Center's CE-18 facility. This testing was a follow-on project sponsored by NASA Lewis to study range enhancements in small turbomachinery. The test was conducted against a baseline rotor design that was also tested in CE-18. The design point for the rotor was a rotor pressure ratio of 2.69, a mass flow of 10.52 lbm/sec, and an adiabatic efficiency of 89.1 percent. Test data indicate that the rotor met the pressure ratio of 2.69 with a 10.77 lbm/sec flow rate, a 87.5-percent adiabatic efficiency, and a 19.5-percent stall margin. The baseline rotor achieved a pressure ratio of 2.69 at a 10.77 lbm/sec flow rate with a stall margin of only 9.2 percent and an adiabatic efficiency of 87.0 percent. The major differences are the significant stall margin increase and the substantially higher off-design peak efficiencies of the forward-swept rotor. The substantially higher performance over the baseline rotor design makes the new design a viable technology candidate for future products.
    Keywords: Aircraft Propulsion and Power
    Type: Research and Technology 1996; NASA-TM-1-7350
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    BladeCAD: An Interactive Geometric Design Tool for Turbomachinery Blades (1996)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A new metthodology for interactive design of turbomachinery blades is presented. Software implementation of the meth- ods provides a user interface that is intuitive to aero-designers while operating with standardized geometric forms. The primary contribution is that blade sections may be defined with respect to general surfaces of revolution which may be defined to represent the path of fluid flow through the turbomachine. The completed blade design is represented as a non-uniform rational B-spline (NURBS) surface and is written to a standard IGES file which is portable to most design, analysis, and manufacturing applications.
    Keywords: Aircraft Propulsion and Power
    Type: NASA-TM-107262 , E-10327 , NAS 1.15:107262 , Gas Turbine and Aeroengine Congress; Jun 10, 1996 - Jun 13, 1996; Birmingham; United Kingdom
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Formulation of full state feedback for infinite order structural systems (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The estimation of exact displacement and displacement rate feedback kernels from finite dimensional control solutions based on finite element structural models is discussed. These kernels are then transformed to equivalent curvature and curvature rate feedback kernels. These curvature kernels are augmented with single point displacement and rotation feedback to account for rigid body motions. A growing class of sensors known as area-averaging sensors is used to measure the curvature and curvature rate state functions. The output of area-averaging sensors equals the convolution of all structural curvature states with the spatial sensitivity function of the sensors. Transforming the discrete feedback gains into continuous feedback kernels and employing area-averaging sensors make it possible to implement full state feedback for infinite order structural systems.
    Keywords: STRUCTURAL MECHANICS
    Type: Joint U.S./Japan Conference on Adaptive Structures; Nov 13, 1990 - Nov 15, 1990; Maui, HI; United States
    Format: text
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    NASA TECHNICAL REPORTS
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