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Research on the Measurement Technology of Air Data in Transonic and Hypersonic Flight

Author: MengBo
Tutor: LiRongBing
School: Nanjing University of Aeronautics and Astronautics
Course: Navigation,Guidance and Control
Keywords: Air data system Transonic height Transonic angle of attack Waverider aircraft CFD calculations Neural Networks
CLC: V247.5
Type: Master's thesis
Year: 2011
Downloads: 86
Quote: 0
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Abstract


Air Data System (ADS) is essential aviation aircraft airborne avionics systems, the accuracy of measurements of atmospheric parameters by the impact of aircraft flight conditions and atmospheric environment, atmospheric data volatility This article is mainly for aircraft transonic and hypersonic the of atmospheric parameters solver flight model / algorithm of these key issues, to carry out in-depth study of traditional ADS and embedded ADS (FADS) in atmospheric data measurement techniques. Highly volatile characteristics of the transonic traditional air data system, the paper analyzes the height of the inertial navigation system and pressure altitude solver principle study atmospheric / INS channel damping circuit characteristics, highly integrated design of the transonic atmospheric / INS algorithm multiple fusion of atmospheric and inertial navigation information. Papers using actual models of the flight data of the algorithm is validated, the algorithm can effectively reduce the height of the amplitude of the fluctuations of the the transonic atmosphere / INS smooth height information and flight stability. Papers based on airborne attack angle sensor configuration characteristics, the angle of attack error characteristics of calibration methods and transonic analysis, design of transonic traditional air data system based on BP neural network compensation correction algorithm of the angle of attack, the use of improved BP algorithm and flight The training and test data on a network. Proven analysis, the algorithm can significantly eliminate the transonic atmospheric measuring the angle of attack of severe jitter to improve the accuracy and transonic angle of attack flying qualities. Hypersonic aviation aircraft flying faster (waverider aircraft), the use of FADS measurement of atmospheric parameters. Paper established a three-dimensional geometric model waverider aircraft and a variety of flight conditions CFD (computational fluid dynamics). The CFD computational data analysis of the specific parts of the body pressure and temperature fields distribution characteristics, and FADS manometry point layout design and optimization. Papers based on waverider aircraft CFD results, further analysis of the FADS pressure field model features designed FADS algorithms based on neural networks, respectively, the use of traditional BP network, and improved BP network and RBF network to approximate the pressure field model. The algorithm validation results show that the improved BP network and RBF network to achieve Mach number and angle of attack / sideslip angle atmospheric parameters solver conducive to multiply wave body aircraft atmospheric parameters accurately obtain.

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CLC: > Aviation, aerospace > Aviation > Aircraft instrumentation,avionics, flight control and navigation > Computing device > Data processing and recovery
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