Author: Stephen A. WhitmorePublisher:
ISBN:
Category :
Languages : en
Pages : 18
Book Description
Preliminary Results from a Subsonic High Angle-of-attack Flush Airdata Sensing (HI-FADS) System: Design, Calibration, and Flight Test Evaluation
Author: Stephen A. WhitmoreFlush Airdata Sensing (FADS) System Calibration Procedures and Results for Blunt Forebodies
Author: Brent R. CobleighPublisher:
ISBN:
Category : Aeronautical instruments
Languages : en
Pages : 34
Book Description
Blunt-forebody pressure data are used to study the behavior of the NASA Dryden Flight Research Center flush airdata sensing (FADS) pressure model and solution algorithm. The model relates surface pressure measurements to the airdata state. Spliced from the potential flow solution for uniform flow over a sphere and the modified Newtonian impact theory, the model was shown to apply to a wide range of blunt-forebody shapes and Mach numbers. Calibrations of a sphere, spherical cones, a Rankine half body, and the F-14, F/A-18, X-33, X-34, and X-38 configurations are shown. The three calibration parameters are well-behaved from Mach 0.25 to Mach 5.0, an angle-of-attack range extending to greater than 30 deg., and an angle-of-sideslip range extending to greater than 15 deg. Contrary to the sharp calibration changes found on traditional pitot-static systems at transonic speeds, the FADS calibrations are smooth, monotonic functions of Mach number and effective angles of attack and sideslip. Because the FADS calibration is sensitive to pressure port location, detailed measurements of the actual pressure port locations on the flight vehicle are required and the wind-tunnel calibration model should have pressure ports in similar locations. The procedure for calibrating a FADS system is outlined.
Design and Calibration of the X-33 Flush Airdata Sensing (FADS) System
Author: Stephen A. WhitmorePublisher:
ISBN:
Category : Aerodynamic measurements
Languages : en
Pages : 38
Book Description
Development of a Flush Airdata Sensing System on a Sharp-nosed Vehicle for Flight at Mach 3 to 8
Author: Mark C. DavisPublisher:
ISBN:
Category : Aerodynamics, Hypersonic
Languages : en
Pages : 28
Book Description
NASA Dryden Flight Research Center has developed a flush airdata sensing (FADS) system on a sharp-nosed, wedge-shaped vehicle. This paper details the design and calibration of a real-time angle-of-attack estimation scheme developed to meet the onboard airdata measurement requirements for a research vehicle equipped with a supersonic-combustion ramjet engine. The FADS system has been designed to perform in flights at speeds between Mach 3 and Mach 8 and at angles of attack between -6° and 12°. The description of the FADS architecture includes port layout, pneumatic design, and hardware integration. Predictive models of static and dynamic performance are compared with wind-tunnel results across Mach and angle-of-attack range. Results indicate that static angle-of-attack accuracy and pneumatic lag can be adequately characterized and incorporated into a real-time algorithm.
Scientific and Technical Aerospace Reports
Author: Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1460
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Flight-Determined Subsonic Longitudinal Stability and Control Derivatives of the F-18 High Angle of Attack Research Vehicle (HARV) with Thrust Vectoring
Author: Kenneth W. IliffPublisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 74
Book Description
Flight-Determined, Subsonic, Lateral-Directional Stability and Control Derivatives of the Thrust-Vectoring F-18 High Angle of Attack Research Vehicle (HARV), and Comparisons to the Basic F-18 and Predicted Derivatives
Author: Kenneth W. IliffPublisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 92
Book Description
Prediction and Validation Technologies of Aerodynamic Force and Heat for Hypersonic Vehicle Design
Author: Min ZhaoPublisher: Springer Nature
ISBN: 9813365269
Category : Technology & Engineering
Languages : en
Pages : 257
Book Description
This book provides an overview of advanced prediction and verification technologies for aerodynamics and aerothermodynamics and assesses a number of critical issues in advanced hypersonic vehicle design. Focusing on state-of-the-art theories and promising technologies for engineering applications, it also presents a range of representative practical test cases. Given its scope, the book offers a valuable asset for researchers who are interested in thermodynamics, aircraft design, wind tunnel testing, fluid dynamics and aerothermodynamics research methods, introducing them to inspiring new research topics.
Fault Detection and Flight Data Measurement
Author: Ihab SamyPublisher: Springer
ISBN: 3642240526
Category : Technology & Engineering
Languages : en
Pages : 185
Book Description
This book considers two popular topics: fault detection and isolation (FDI) and flight data estimation using flush air data sensing (FADS) systems. Literature surveys, comparison tests, simulations and wind tunnel tests are performed. In both cases, a UAV platform is considered for demonstration purposes. In the first part of the book, FDI is considered for sensor faults where a neural network approach is implemented. FDI is applied both in academia and industry resulting in many publications over the past 50 years or so. However few publications consider neural networks in comparison to traditional techniques such as observer based, parameter estimations and parity space approaches. The second part of this book focuses on how to estimate flight data (angle of attack, airspeed) using a matrix of pressure sensors and a neural network model. In conclusion this book can serve as an introduction to FDI and FADS systems, a literature survey, and a case study for UAV applications.
Author: David F. Fisher