An Evaluation Of Frequency Domain Ensemble Averging To Improve Aircraft Stability Derivative Estimation
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An Evaluation Of Frequency Domain Ensemble Averging To Improve Aircraft Stability Derivative Estimation
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Author : Lawrence Hoffman
language : en
Publisher:
Release Date : 1998-03-01
An Evaluation Of Frequency Domain Ensemble Averging To Improve Aircraft Stability Derivative Estimation written by Lawrence Hoffman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998-03-01 with categories.
This research evaluated a process to improve aircraft stability derivative estimation results. The Have Derivatives process used overlap ensemble averaging in the frequency domain to minimize noise on the original time domain signals. The process estimated average complex frequency response functions that were then transformed back into the time domain as a set of discrete pulse responses with far less noise than the original signals. These clean signals were used in a parameter estimation program to estimate better stability derivatives than were estimated with the original noisy signals. Both simulation and flight test data were used to study the effects of various noise levels on stability derivative estimation results and to evaluate the Have Derivatives process to improve those results. The simulations demonstrated dramatic improvement using the Have Derivatives process. The flight test results were not as conclusive. The ensemble averaging step of the Have Derivatives process was not effective enough at reducing noise on the flight test data due to non-uniform frequency content of the flight test input. The overall recommendation was to further evaluate the Have Derivatives process using a broadband flight test input, similar to the input that worked well in simulation.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1989
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Aeronautics categories.
Aircraft System Identification
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Author : Eugene Morelli
language : en
Publisher: Sunflyte Enterprises
Release Date : 2016
Aircraft System Identification written by Eugene Morelli and has been published by Sunflyte Enterprises this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with Technology & Engineering categories.
This book provides a comprehensive overview of both the theoretical underpinnings and the practical application of aircraft modeling based on experimental data also known as aircraft system identification. Much of the material presented comes from the authors own extensive research and teaching activities at the NASA Langley Research Center, and is based on real-world applications of system identification to aircraft. The book uses actual flight-test and wind-tunnel data for case studies and examples, and is a valuable resource for researchers and practicing engineers, as well as a textbook for postgraduate and senior-level courses. [...] The methods and algorithms explained in the book are implemented in a NASA software toolbox called SIDPAC (System IDentification Programs for AirCraft). SIDPAC is written in MATLAB®, and is available by request from NASA Langley Research Center. SIDPAC is composed of many different tools that implement a wide variety of approaches explained fully in the book. These tools can be readily applied to solve aircraft system identification problems.
Applied Mechanics Reviews
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Author :
language : en
Publisher:
Release Date : 1948
Applied Mechanics Reviews written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1948 with Mechanics, Applied categories.
Photoplethysmography
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Author : Panicos A. Kyriacou
language : en
Publisher: Academic Press
Release Date : 2021-11-03
Photoplethysmography written by Panicos A. Kyriacou and has been published by Academic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-11-03 with Technology & Engineering categories.
Photoplethysmography: Technology, Signal Analysis, and Applications is the first comprehensive volume on the theory, principles, and technology (sensors and electronics) of photoplethysmography (PPG). It provides a detailed description of the current state-of-the-art technologies/optical components enabling the extreme miniaturization of such sensors, as well as comprehensive coverage of PPG signal analysis techniques including machine learning and artificial intelligence. The book also outlines the huge range of PPG applications in healthcare, with a strong focus on the contribution of PPG in wearable sensors and PPG for cardiovascular assessment. Presents the underlying principles and technology surrounding PPG Includes applications for healthcare and wellbeing Focuses on PPG in wearable sensors and devices Presents advanced signal analysis techniques Includes cutting-edge research, applications and future directions
Dissertation Abstracts International
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Author :
language : en
Publisher:
Release Date : 2003
Dissertation Abstracts International written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Dissertations, Academic categories.
Aeroacoustics Of Flight Vehicles
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Author : Harvey H. Hubbard
language : en
Publisher:
Release Date : 1991
Aeroacoustics Of Flight Vehicles written by Harvey H. Hubbard and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Aerodynamic noise categories.
Government Reports Announcements Index
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Author :
language : en
Publisher:
Release Date : 1984-03
Government Reports Announcements Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984-03 with Science categories.
International Aerospace Abstracts
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Author :
language : en
Publisher:
Release Date : 1995
International Aerospace Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Aeronautics categories.
On The Formulation Of The Aerodynamic Characteristics In Aircraft Dynamics
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Author : Murray Tobak
language : en
Publisher:
Release Date : 1976
On The Formulation Of The Aerodynamic Characteristics In Aircraft Dynamics written by Murray Tobak and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with Nonlinear functional analysis categories.
The theory of functionals is used to reformulate the notions of aerodynamic indicial functions and superposition. Integral forms for the aerodynamic response to arbitrary motions are derived that are free of dependence on a linearity assumption. Simplifications of the integral forms lead to practicable nonlinear generalizations of the linear superposition and the stability derivative formulations. Applied to arbitrary nonplanar motions, the generalization yields a form for the aerodynamic response that can be compounded of the contributions from a limited number of well-defined characteristic motions, in principle reproducible in the wind tunnel. Further generalizations that would enable the consideration of random fluctuations and multivalued aerodynamic responses are indicated.