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Analytic Gradient Computation and Applications in Multitarget Multi-Impulse Trajectory Optimization

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JOURNAL OF GUIDANCE CONTROL AND DYNAMICS 2024年第2期47卷 347-357页

作者： Zhang, Nan Di, Wu Baoyin, Hexi Tsinghua Univ Sch Aerosp Engn Beijing 100084 Peoples R China

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Aeroacoustic Source Potential Based on Poisson's Equation

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AIAA JOURNAL 2024年第7期62卷 2772-2782页

作者： Schoder, Stefan Bagheri, Eman Spieser, Etienne Graz Univ Technol Inst Fundamentals & Theory Elect Engn IGTE Inffeldgasse 18 A-8010 Graz Austria Friedrich Alexander Univ Inst Fluid Mech LSTM D-91058 Erlangen Germany Friedrich Alexander Univ Inst Fluid Mech LSTM D-91058 Erlangen Germany Hong Kong Univ Sci & Technol Dept Mech & Aerosp Engn Clear Water Bay Hong Kong Peoples R China

Poisson's equation is an important equation to postprocess the aerodynamic fields into linearized momentum modes and was recently found to be important for the computation of an isotropic pressure-like source for scalar aeroacoustic wave models, like the aeroacoustic wave equation based on Pierce's operator (AWE-PO). Mathematically viable boundary conditions of the Poisson equation, which computes the AWE-PO source, are investigated. For the different source fields, the wave propagation is computed using the AWE-PO, and the details of the sound prediction results are compared to a reference direct numerical simulation of a mixing layer. The different boundary conditions of the Poisson equation were found to have a minor influence on the overall sound prediction characteristics of the AWE-PO equation. The AWE-PO is reformulated into a simplified version of the Phillips's equation, which mitigates the intermediate step of computing an isotropic source potential. By doing so, a previously obtained interference radiation valley in the radiated acoustic intensity of the AWE-PO results is attributed to a missing shear-noise source term.

关键词： Mathematical Analysis Computational Fluid Dynamics Aeroacoustics computing and informatics

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Regional Constellation Reconfiguration Problem: Integer Linear Programming Formulation and Lagrangian Heuristic Method

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JOURNAL OF SPACECRAFT AND ROCKETS 2023年第6期60卷 1828-1845页

作者： Lee, Hang Woon Ho, Koki West Virginia Univ Dept Mech & Aerosp Engn Morgantown WV 26506 USA Georgia Inst Technol Daniel Guggenheim Sch Aerosp Engn Atlanta GA 30332 USA

A group of satellites, with either homogeneous or heterogeneous orbital characteristics and/or hardware specifications, can undertake a reconfiguration process due to variations in operations pertaining to Earth observation missions. This paper investigates the problem of optimizing a satellite constellation reconfiguration process against two competing mission objectives: 1) the maximization of the total coverage reward, and 2) the minimization of the total cost of the transfer. The decision variables for the reconfiguration process include the design of the new configuration and the assignment of satellites from one configuration to another. We present a novel biobjective integer linear programming formulation that combines constellation design and transfer problems. The formulation lends itself to the use of generic mixed-integer linear programming (MILP) methods such as the branch-and-bound algorithm for the computation of provably optimal solutions;however, these approaches become computationally prohibitive even for moderately sized instances. In response to this challenge, this paper proposes a Lagrangian relaxation-based heuristic method that leverages the assignment problem structure embedded in the problem. The results from the computational experiments attest to the near-optimality of the Lagrangian heuristic solutions and a significant improvement in the computational runtime as compared to a commercial MILP solver.

关键词： Satellite Constellations Earth Observation Mixed Integer Linear Programming Orbital Maneuvers computing and informatics Reconfiguration Lagrangian Relaxation

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Rapid Determination of Low-Earth-Orbit Occultation-Event Windows

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JOURNAL OF GUIDANCE CONTROL AND DYNAMICS 2024年第5期47卷 979-985页

作者： Yang, Hongwei Zhang, Yu Li, Shuang Bai, Xiaoli Nanjing Univ Aeronaut & Astronaut Coll Astronaut Nanjing 211106 Peoples R China Rutgers State Univ Dept Mech & Aerosp Engn Piscataway NJ 08854 USA

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Aerodynamic Data to Design an Active Thermal Protection System for SpaceLiner 7-1

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JOURNAL OF SPACECRAFT AND ROCKETS 2023年第6期60卷 2013-2017页

作者： Zuppardi, Gennaro Mongelluzzo, Giuseppe Univ Naples Federico II I-80125 Naples Italy Natl Inst Astrophys Astron Observ Capodimonte I-80131 Naples Italy INAF OACN Naples Italy

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Applications Of Robust Control To Nonlinear Systems

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丛书名： Progress in Astronautics and Aeronautics

2004年

作者： Richard Colgren

ISBN: (数字)9781600866722

ISBN: (纸本)9781563476662

This book offers a three-step approach to generating a robust nonlinear controller: modeling, synthesis, and robustness analysis. The publication is targeted to practicing engineers and graduate-level students working in guidance, information command and control systems, and CAD/*** methods covered in this book allow the user to design and analyze nonlinear controllers for nonlinear systems with several important and unique characteristics: the ability to specify the closed loop system's frequency response via requirements on the sensitivity (S) and complementary sensitivity (T), the ability to directly minimize an undesirable resonance or peak in the frequency response while simultaneously closing all loops from the input to the output vector in essentially one single design step, and the ability to analyze the stability characteristics for multiple independent and dependent problem variables. The approach uniquely allows the user to achieve stable and robust performance for systems which are both unstable and contain discontinuous nonlinearities using adaptive nonlinear controllers.

关键词： Aerodynamics Aeronautical Engineering Aeronautics Aerospace Electronics Aerospace Engineering Aerospace Sciences Air Forces Aircraft Control Aircraft Design Aircraft Dynamic Modes Aircraft Flight Control System Aircraft Operations Aircraft Operations and Technology Aircraft Performance Aircraft Stability and Control Aircraft Wing Design Aircrafts Algorithms and Data Structures Applied Mathematics Autonomous Systems Aviation Avionics Avionics Computers Civil Aircraft Computer Networks Computer Programming and Language computing and informatics computing, Information, and Communication Control Systems Control Theory Data Science Electrical Measuring Equipment Electricity Electromagnetism Elementary Algebra Feedback Control Flight Control Surfaces Flight Dynamics Flight Training Flying Qualities General Physics Guidance, Navigation, and Control Systems Inverse Problems Military Aviation Multivariable Control Nonlinear Control Theory Optimal Control Theory Optimization Algorithm Riccati Equations Search Algorithm Signal Processing

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Advanced Dynamics Har/Dskt

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丛书名： AIAA Education Series

1997年

作者： Shuh-Jing (Benjamin) Ying

ISBN: (数字)9781600861307

ISBN: (纸本)9781563472244

Advanced Dynamics is recognized as an important subject of study for all engineering students and professionals in competitive university programs and throughout the industry. This textbook adeptly explains the fundamental laws of motion, but goes a step beyond by covering new topics such as gyroscopic effects, missile trajectories, interplanetary missions, multistage rockets, and use of numerical methods. In addition, theories such as the rotation operator are taken to a new degree and developed further, far surpassing comparable *** book balances theory and application and relates all subjects to practical problems, real-world situations, and recent advances that affect everyday life. This text distinguishes itself with a more complete introduction to recent developments in dynamics, new and practical applications to help the reader remember key theories and uses, and an appreciation that the subject matter is riddled with ongoing problems that need new solutions. These distinguishing features make Advanced Dynamics more complete, interesting, and understandable than existing textbooks and resource materials. Problems appear at the end of each chapter, and a complimentary solutions manual is available for professors. Advanced Dynamics is also written for those engineers who want to update their knowledge and stay current on changes in the field, but do not have the opportunity to attend formal classes. The reader will take away a thorough understanding of the foundation of mechanical engineering, which is necessary to read and assimilate scholarly papers and leading articles published in journals and peer-reviewed magazines.

关键词： Aerodynamics Aeronautical Engineering Aeronautics Aircraft Operations Aircraft Operations and Technology Aircraft Stability and Control Aircrafts Applied Mathematics Beam (Structures) Classical Mechanics Computational Fluid Dynamics Computer Programming and Language computing and informatics computing, Information, and Communication Coordinate System Earth Observation Satellite Elementary Algebra Energy Energy Forms Energy Forms, Production and Conversion Energy Storage and Batteries Finite Element Method Flexible and Active Structures Flight Control Surfaces Fluid Dynamics Fluid Flow Properties Fluid Mechanics General Physics Geometry Functions Gyroscopes Launch Vehicles Material Properties Materials and Structural Mechanics Mathematical Analysis Mechanical and Structural Vibrations Multistage Rocket Newton's Laws of Motion Numerical Analysis Planetary Science and Exploration Planets Rotor Dynamics Runge-Kutta Methods Satellites Shell Structures Solid Mechanics Space Launch Systems Space Missions Space Probe Space Science and Technology Space Systems Space Systems and Vehicles Space Vehicle Spacecrafts Stress-Strain Analysis Structural Analysis Structural Design and Development Structural Engineering Structural Kinematics and Dynamics Structural Mechanics Structures, Design and Test Uncrewed Spacecraft Vibration Measuring Instruments Weather Satellite

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Orbital and Celestial Mechanics

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丛书名： Progress in Astronautics and Aeronautics

1998年

作者： Nino L. Bonavito Gim J. Der John P. Vinti

ISBN: (数字)9781600866487

ISBN: (纸本)9781563472565

Orbital and Celestial Mechanics affords engineering students, professors, and researchers alike an opportunity to cultivate the mathematical techniques necessary for this discipline - as well as physics and trajectory mechanics - using the familiar and universal concepts of classical physics. For nonspecialists and students unfamiliar with some of the underlying math principles, the Vinti Spheroidal Method demonstrates computer routines for accurately calculating satellite orbit and ballistic trajectory. More than 20 years ago, Dr. Vinti's revolutionary method was used aboard a ballistic missile targeting program with great success. His work continues to enable both students and professionals to predict position and velocity vectors for satellites and ballistic missiles almost as accurately as numerical integration. Now, the best Vinti algorithms and companion computer source codes are available in one comprehensive package. System Requirements: PC-compatible with MS Windows 95, FORTRAN, and Visual C++ Powerstation 4.0; also mentions UNIX Powerstation with Vi editor.

关键词： Absorption Spectroscopy Aeronautics Aerospace Sciences Air Navigation Aircraft Navigation Systems Applied Mathematics Asteroids Astrodynamics Astronautics Astronomy Celestial Coordinate System Celestial Mechanics Classical Mechanics Computer Programming and Language computing and informatics computing, Information, and Communication Coordinate System Earth Sciences Electrodynamics Electromagnetic Analysis Electromagnetism Elementary Algebra Energy Energy Forms Energy Forms, Production and Conversion General Physics Geophysics Guidance, Navigation, and Control Systems Inverse Problems Kepler's Laws of Planetary Motion Mathematical Analysis NASA NASA Programs Newton's Laws of Motion Oceanography Operating Systems Orbital Maneuvers Orbital Property Planetary Science and Exploration Planets Satellites Software Systems Solar Activity Solar Atmosphere Solar Physics Space Advocacy Organizations Space Agencies Space Orbit Space Organizations Space Science and Technology Space Stations Space Systems and Vehicles Spacecrafts Spectroscopy Systems Software

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Fundamentals Of High Accuracy Inertial Navigation 1st

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丛书名： Progress in Astronautics and Aeronautics

1997年

作者： Averil B. Chatfield

ISBN: (数字)9781600866463

ISBN: (纸本)9781563472435

The primary focus of Fundamentals of High Accuracy Inertial Navigation is on the physical and mathematical principles forming the basis for inertial navigation. It differs from other books on the subject by treating aspects of the blend of inertial navigation technology and geodesy. Accuracy criteria and evaluation are also discussed. Fundamentals of High Accuracy Inertial Navigation is divided into three parts: inertial navigation, inertial navigation with aids, and accuracy analysis. The first two parts are designed to give the reader an understanding of the fundamentals without requiring knowledge of the statistical analysis techniques involved in determining the effects of errors on accuracy. The third part defines the criteria for determining accuracy and then leads the reader through the complex process of that determination. This book is intended for the third- or fourth-year engineering student, as well as professional engineers or scientists trained in mathematics, control theory, analytical mechanics, geodesy, or physics, who have a need for understanding the basic principles of inertial navigation technology.

关键词： Aerodynamics Aeronautical Engineering Aeronautics Air Navigation Aircraft Navigation Systems Altitudes in Aviation Applied Mathematics Astronomy Avionics Avionics Computers Bearings (Mechanical) Celestial Mechanics Classical Mechanics Computational Fluid Dynamics Computer Programming and Language computing and informatics computing, Information, and Communication Control Systems Control Theory Coordinate System Doppler Effect Earth Observation Satellite Earth Sciences Electrodynamics Electromagnetic Radiation Electromagnetism Elementary Algebra Fault Detection and Isolation Feedback Control Finite Element Method Fluid Dynamics Fluid Flow Properties Fluid Mechanics General Physics Geometry Functions Geophysics Global Positioning System Guidance, Navigation, and Control Systems Gyroscopes Hydraulic Fluid Hydraulics Kalman Filter Mathematical Analysis Mechanical and Structural Vibrations Monte Carlo Method Navigational Guidance Newton's Laws of Motion Numerical Analysis Planetary Atmospheres Planetary Science and Exploration Planets Satellite Navigation Systems Satellites Sensors Signal Processing Solar Physics Solar Wind Space Flight Tracking and Data Network Space Science and Technology Space Systems and Vehicles Spacecraft Guidance and Control Spacecrafts Structural Analysis Structural Design and Development Structural Engineering Structural Kinematics and Dynamics Structures, Design and Test Torsional Vibration Transducers Tribology and Bearing Design Vibration Measuring Instruments

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An Assessment of the Laminar Hypersonic Double-Cone Experiments in the LENS-XX Tunnel

An Assessment of the Laminar Hypersonic Double-Cone Experime...

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AIAA Science and Technology (SciTech) Forum

作者： Ray, Jaideep Blonigan, Patrick Phipps, Eric T. Maupin, Kathryn Sandia Natl Labs Extreme Scale Data Sci & Analyt MS 9152 Livermore CA 94550 USA Sandia Natl Labs Scalable Algorithms Albuquerque NM 87185 USA Sandia Natl Labs Optimizat & Uncertainty Quantificat MS 1318 Albuquerque NM 87185 USA

ISBN: (数字)9781624106996

ISBN: (纸本)9781624106996

This is an investigation on two experimental datasets of laminar hypersonic flows, over a double-cone geometry, acquired in Calspan-University at Buffalo Research Center's Large Energy National Shock (LENS)-XX expansion tunnel. These datasets have yet to be modeled accurately. A previous paper suggested that this could partly be due to mis-specified inlet conditions. The authors of this paper solved a Bayesian inverse problem to infer the inlet conditions of the LENS-XX test section and found that in one case they lay outside the uncertainty bounds specified in the experimental dataset. However, the inference was performed using approximate surrogate models. In this paper, the experimental datasets are revisited and inversions for the tunnel test-section inlet conditions are performed with a Navier-Stokes simulator. The inversion is deterministic and can provide uncertainty bounds on the inlet conditions under a Gaussian assumption. It was found that deterministic inversion yields inlet conditions that do not agree with what was stated in the experiments. An a posteriori method is also presented to check the validity of the Gaussian assumption for the posterior distribution. This paper contributes to ongoing work on the assessment of datasets from challenging experiments conducted in extreme environments, where the experimental apparatus is pushed to the margins of its design and performance envelopes.

关键词： Inverse Problems Uncertainty Quantification Computational Fluid Dynamics computing and informatics Hypersonic Flows

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