Compensating for pneumatic distortion in pressure sensing devices

A technique of compensating for pneumatic distortion in pressure sensing devices was developed and verified. This compensation allows conventional pressure sensing technology to obtain improved unsteady pressure measurements. Pressure distortion caused by frictional attenuation and pneumatic resonance within the sensing system makes obtaining unsteady pressure measurements by conventional sensors difficult. Most distortion occurs within the pneumatic tubing which transmits pressure impulses from the aircraft's surface to the measurement transducer. To avoid pneumatic distortion, experiment designers mount the pressure sensor at the surface of the aircraft, (called in-situ mounting). In-situ transducers cannot always fit in the available space and sometimes pneumatic tubing must be run from the aircraft's surface to the pressure transducer. A technique to measure unsteady pressure data using conventional pressure sensing technology was developed. A pneumatic distortion model is reduced to a low-order, state-variable model retaining most of the dynamic characteristics of the full model. The reduced-order model is coupled with results from minimum variance estimation theory to develop an algorithm to compensate for the effects of pneumatic distortion. Both postflight and real-time algorithms are developed and evaluated using simulated and flight data

Assessment of avionics technology in European aerospace organizations

This report provides a summary of the observations and recommendations made by a technical panel formed by the National Aeronautics and Space Administration (NASA). The panel, comprising prominent experts in the avionics field, was tasked to visit various organizations in Europe to assess the level of technology planned for use in manufactured civil avionics in the future. The primary purpose of the study was to assess avionics systems planned for implementation or already employed on civil aircraft and to evaluate future research, development, and engineering (RD&E) programs, address avionic systems and aircraft programs. The ultimate goal is to ensure that the technology addressed by NASa programs is commensurate with the needs of the aerospace industry at an international level. The panel focused on specific technologies, including guidance and control systems, advanced cockpit displays, sensors and data networks, and fly-by-wire/fly-by-light systems. However, discussions the panel had with the European organizations were not limited to these topics

Neural network systems, techniques, and applications. Vol.1-7

7 v. : ill. ; 24 cm

Database and Data Communication Network Systems : Tehcniques and Applications Volume 5

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Neural network systems, techniques, and applications. t.IV, Industrial and manufacturing systems

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Fuzzy logic and expert systems applications. t.VI, Neural network systems, techniques, and applications

xx, 416 p. : ill. ; 28 cm

Optimization techniques. t.II, Neural network systems, techniques, and applications

xx, 398 p. : ill. ; 28 cm

Digital Control Systems Implementation Techniques

Praise for Previous Volumes "This book will be a useful reference to control engineers and researchers. The papers contained cover well the recent advances in the field of modern control theory."--IEEE GROUP CORRESPONDANCE "This book will help all those researchers who valiantly try to keep abreast of what is new in the theory and practice of optimal control."--CONTROL.Praise for Previous Volumes "This book will be a useful reference to control engineers and researchers. The papers contained cover well the recent advances in the field of modern control theory."--IEEE GROUP CORRESPONDANCE "This book will help all those researchers who valiantly try to keep abreast of what is new in the theory and practice of optimal control."--CONTROL.H.M. Al-Rahmani and G.F. Franklin, Techniques in Multirate Digital Control. M. Kinnaert and Y. Peng, The Design of Digital Pole Placement Controllers. F. Bernelli-Zazzera and P. Mantegazza, Linearization Techniques for Pulse Width Control of Linear Systems. S. Bingulac and H.F. VanLandingham, Algorithms for Discretization and Continualization of MIMO State Space Representations. T. Ishihara, Discrete-Time Control Systems Design via Loop Transfer Recovery. Z. Gajic, M. Lim, and X. Shen, The Study of Discrete Singularly Perturbed Linear-Quadratic Control Systems. A.D. Spence and Y. Altintas, Modelling Techniques and Control Architectures for Machining Intelligence. S. Wu and S. Cetinkunt, Techniques in Discrete-Time Position Control of Flexible One Arm Robots. D. Aeyels and J.L. Willems, Pole Assignment by Memoryless Periodic Output Feedback. Subject Index.Includes bibliographical references and index.Print version record.Elsevie

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