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  • 1
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    Macular bioaccelerometers on earth and in space (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Spaceflight offers the unique opportunity to study linear bioaccelerometers (vestibular maculas) in the virtual absence of a primary stimulus, gravitational acceleration. Combined morphological-physiological studies of maculas fixed in space and following flight should reveal macular adaptive responses to microgravity, and their time-course. Ground-based research, already begun, using computer-assisted, three-dimensional reconstructions of macular terminal fields will lead to development of computer models of functioning maculas. This research should continue in conjunction with physiological studies, including work with multichannel electrodes.
    Keywords: AEROSPACE MEDICINE
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  • 2
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    General quadratic cost functions for optimal partial state feedback (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: ELECTRONICS
    Type: IEEE Transactions on Automatic Control; AC-19; Apr. 197
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  • 3
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    NASA Ames Active Control Aircraft flight experiments (ACA) program (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The objectives of the Ames ACA program are to develop the active control technology (ACT) for short-haul aircraft, to evaluate existing methods, to develop new techniques, and to demonstrate the readiness of the technology in operational environment. Two concepts are basic to ACT: integrated aircraft design and integrated flight-control-system design.
    Keywords: AIRCRAFT STABILITY AND CONTROL
    Type: Systems Reliability Issues for Future Aircraft; p 21-26
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  • 4
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    Macular Bioaccelerometers on Earth and in Space (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Space flight offers the opportunity to study linear bioaccelerometers (vestibular maculas) in the virtual absence of a primary stimulus, gravitational acceleration. Macular research in space is particularly important to NASA because the bioaccelerometers are proving to be weighted neural networks in which information is distributed for parallel processing. Neural networks are plastic and highly adaptive to new environments. Combined morphological-physiological studies of maculas fixed in space and following flight should reveal macular adaptive responses to microgravity, and their time-course. Ground-based research, already begun, using computer-assisted, 3-dimensional reconstruction of macular terminal fields will lead to development of computer models of functioning maculas. This research should continue in conjunction with physiological studies, including work with multichannel electrodes. The results of such a combined effort could usher in a new era in understanding vestibular function on Earth and in space. They can also provide a rational basis for counter-measures to space motion sickness, which may prove troublesome as space voyager encounter new gravitational fields on planets, or must re-adapt to 1 g upon return to earth.
    Keywords: AEROSPACE MEDICINE
    Type: NASA. Lyndon B. Johnson Space Center, Spacelab Life Sciences 1: Reprints of Background Life Sciences Publications; p 261-271
    Format: application/pdf
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  • 5
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    Contact angle determination procedure and detection of an invisible surface film (1990)
    In:  Other Sources
    Details
    Publication Date: 2013-08-29
    Description: The contact angle value, i.e., the tangent angle of liquid resting on a planar solid surface, is a basic parameter which can be applied to a wide range of applications. The goal is to provide a basic understanding of the contact angle measurement technique and to present a simple illustration that can be applied as a quality control method; namely, detection of a surface contaminant which exists on a surface that appears clean to the unaided eye. The equipment and experimental procedures are detailed.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: NASA, Langley Research Center, National Educators' Workshop: Update 1988. Standard Experiments in Engineering Materials Science and Technology; p 13-26
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  • 6
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    Nonlinear systems approach to control system design (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Consider some of the control system design methods for plants with nonlinear dynamics. If the nonlinearity is weak relative to the size of the operating region, then the linear methods apply directly. Fixed-gain design may be feasible even for significant nonlinearities. It may be possible to find a single gain which provides adequate control of the linear models at several perturbation points. If the nonlinearity is restricted to a sector, that fact may be used to obtain a fixed-gain controller. Otherwise, a gain may have to be associated with each perturbation point Pi. A gain schedule K(p(v)) is obtained by connecting the perturbation points by a function, say p(v), of the scheduling parameter v (i.e., speed). When the scheduling parameter must be multidimensional, this approach is difficult; the objective is to develop an easier procedure.
    Keywords: AIRCRAFT STABILITY AND CONTROL
    Type: NASA. Langley Research Center NASA Aircraft Controls Research, 1983; p 329-341
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  • 7
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    Application of Nonlinear Systems Inverses to Automatic Flight Control Design: System Concepts and Flight Evaluations (1981)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: A practical method for the design of automatic flight control systems for aircraft with complex characteristics and operational requirements, such as the powered lift STOL and V/STOL configurations, is presented. The method is effective for a large class of dynamic systems requiring multi-axis control which have highly coupled nonlinearities, redundant controls, and complex multidimensional operational envelopes. It exploits the concept of inverse dynamic systems, and an algorithm for the construction of inverse is given. A hierarchic structure for the total control logic with inverses is presented. The method is illustrated with an application to the Augmentor Wing Jet STOL Research Aircraft equipped with a digital flight control system. Results of flight evaluation of the control concept on this aircraft are presented.
    Keywords: AIRCRAFT STABILITY AND CONTROL
    Type: AGARD Theory and Appl. of Optimal Control in Aerospace Systems; 29 p
    Format: text
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  • 8
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    Methodology for design of active controls for V/STOL aircraft (1976)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: An effort to develop techniques for the design of integrated, fully automatic flight control systems for powered lift STOL and VTOL aircraft is described. The structure is discussed of the control system which has been developed to deal with the strong nonlinearities inherent in this class of aircraft, to admit automatic coupling with the advanced ATC requiring accurate execution of complex trajectories, and to admit a variety of active control tasks. The specific case considered is the Augmentor Wing Research Aircraft.
    Keywords: AIRCRAFT STABILITY AND CONTROL
    Type: Advanced Control Technol. and its Potential for Future Transport Aircraft; p 923-931
    Format: application/pdf
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  • 9
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    Nonlinear control of aircraft (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Transformations of nonlinear systems were used to design automatic flight controllers for vertical and short takeoff aircraft. Under the assumption that a nonlinear system can be mapped to a controllable linear system, a method using partial differential equations was constructed to approximate transformations in cases where exact ones cannot be found. An application of the design theory to a rotorcraft, the UH-1H helicopter, was presented.
    Keywords: AIRCRAFT STABILITY AND CONTROL
    Type: NASA-TM-89225 , NAS 1.15:89225
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  • 10
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    Aircraft automatic-flight-control system with inversion of the model in the feed-forward path using a Newton-Raphson technique for the inversion (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A new automatic flight control system concept suitable for aircraft with highly nonlinear aerodynamic and propulsion characteristics and which must operate over a wide flight envelope was investigated. This exact model follower inverts a complete nonlinear model of the aircraft as part of the feed-forward path. The inversion is accomplished by a Newton-Raphson trim of the model at each digital computer cycle time of 0.05 seconds. The combination of the inverse model and the actual aircraft in the feed-forward path alloys the translational and rotational regulators in the feedback path to be easily designed by linear methods. An explanation of the model inversion procedure is presented. An extensive set of simulation data for essentially the full flight envelope for a vertical attitude takeoff and landing aircraft (VATOL) is presented. These data demonstrate the successful, smooth, and precise control that can be achieved with this concept. The trajectory includes conventional flight from 200 to 900 ft/sec with path accelerations and decelerations, altitude changes of over 6000 ft and 2g and 3g turns. Vertical attitude maneuvering as a tail sitter along all axes is demonstrated. A transition trajectory from 200 ft/sec in conventional flight to stationary hover in the vertical attitude includes satisfactory operation through lift-cure slope reversal as attitude goes from horizontal to vertical at constant altitude. A vertical attitude takeoff from stationary hover to conventional flight is also demonstrated.
    Keywords: AIRCRAFT STABILITY AND CONTROL
    Type: NASA-TM-88209 , A-2-86092 , NAS 1.15:88209
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