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IFAC Proceedings Volumes 2010年第15期43卷 434-439页

作者： C. Döll G. Hardier A. Varga C. Kappenberger ONERA The French Aerospace Lab System Control and Flight Dynamics Department BP 74025 F-31055 Toulouse Cedex 4 France DLR German Aerospace Center Robotics and Mechatronics Department Münchner Str. 20 D-82234 Weßling Germany DLR German Aerospace Center Flight Systems Department Lilienthalplatz 7 D-38108 Braunschweig Germany

Abstract The IMMUNE project (Intelligent Monitoring and Managing of UNexpected Events) focuses on basic research regarding event monitoring and event tolerant control. Event detection methods and control law reconfiguration approaches have been investigated for their applicability in the context of developing advanced aircraft flight control systems. For promising methods, prototype software tools have been implemented in a desktop simulation environment to serve as basis for evaluation studies.

关键词： fault detection and isolation parameter identification control law reconfiguration adaptive control supervisor

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Static Output Feedback Design to Achieve Phase Stabilization of Bending Mode

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IFAC Proceedings Volumes 1998年第21期31卷 347-352页

作者： C.B. Asthana M.S. Bhat K.N. Swamy Scientist Control System Lab. Research Centre Imarat Hyderabad - 500058. Associate Professor Aerospace Department Indian Institute of Science Bangalore - 560012. Scientist Advanced Tech. Cell Indian Institute of Science Bangalore - 560012.

The quadratic optimal output feedback solution is found by iteratively satisfying the equations arising from the necessary condition for optimality. A simple, suboptimal solution is derived from the necessary condition which offers acceptable solution without any iterations. This is applied to design a pitch acceleration tracking autopilot for a flexible missile employing wing and tail as two independent control surfaces. It is shown that a matrix of static gains alone, apart from meeting the other design specifications, phase stabilizes the first bending mode and gain stabilizes higher bending modes.

关键词： output feedback static controllers suboptimal phase stability tracking systems missiles

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Moving Horizon Estimation with Pre-Estimation (MHE-PE) for 3D Space Debris Tracking during Atmospheric Re-entry

Moving Horizon Estimation with Pre-Estimation (MHE-PE) for 3...

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IEEE Annual Conference on Decision and control

作者： Rata Suwantong Sylvain Bertrand Didier Dumur Dominique Beauvois Department of System Design and Performance Evaluation ONERA-The French Aerospace-lab F-91761 Palaiseau France Department of Automatic Control E3S SUPELEC 91192 Gif-sur-Yvette France

ISBN: (纸本)9781467360890

Space debris tracking during atmospheric re-entry is a very complex problem due to high variations with time of the ballistic coefficient. The nature of these variations is generally unknown and an assumption has to be made in the estimation model which can result in high model errors. An estimator which is robust against model errors is therefore required. In previous work done by the authors, Moving Horizon Estimation (MHE) has been shown to outperform other classical nonlinear estimators in terms of accuracy and robustness against poor initialization for a simplified 1D case of space debris tracking during the re-entry. However, the large computation time of the MHE prevents its implementation for the 3D cases. Recently, the Moving Horizon Estimation with Pre-Estimation (MHE-PE) which requires much less computation time than the classical MHE while keeping its accuracy and robustness has been proposed. This paper therefore implements the MHE-PE to solve the 3D space debris tracking problem during the re-entry. Its performances are compared to some classical nonlinear estimators in terms of non-divergence percentage, accuracy and computation time through Monte Carlo simulations.

关键词： Atmospheric entries computational time Space debris model error Horizon Moving Moving horizon state estimation

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Stability of a Nonlinear Moving Horizon Estimator with Pre-Estimation

Stability of a Nonlinear Moving Horizon Estimator with Pre-E...

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American control Conference

ISBN: (纸本)9781479932757

In this paper, a Moving Horizon Estimator with pre-estimation (MHE-PE) is proposed for discrete-time nonlinear systems under bounded noise. While the classical Moving Horizon Estimator (MHE) compensates for model errors by estimating the process noise sequence over the horizon via optimization, the MHE-PE does it using an auxiliary estimator. The MHE-PE is shown to require significantly less computation time compared to the MHE, while providing the same order of magnitude of estimation errors. The stability of the estimation errors of the MHE-PE is also proven and an upper bound on its estimation errors is derived. Performances of the MHE-PE is illustrated via a simulation example of pressure estimation in a gas-phase reversible reaction.

关键词： Horizon Moving computational time model error beyond visual range

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Numerical Study of High-Energy Spark Ignition Characteristics in a Scramjet Combustor

SSRN

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SSRN 2024年

作者： Gao, Ziyan Zhang, Meng Zhang, Zhibo Wu, Yun Zheng, Xing Miao, Huifeng National Key Lab of Aerospace Power System and Plasma Technology Xi’an Jiaotong University Xi’an710049 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong Universiy Xi’an710049 China National Key Lab of Aerospace Power System and Plasma Technology Air Force Engineering University Xi’an710038 China Shaanxi Key Laboratory of Environment and Control for Flight Vehicle School of Aerospace Engineering Xi’an Jiaotong University Shaanxi 710049 China

Reliable ignition is a fundamental prerequisite for the scramjet engines. In order to improve the reliability of ignition, further enhance the application of spark ignition in engineering, and improve the ignition ability in the field of supersonic combustion, an innovative long electrode distance high-energy spark igniter (LHSI) system was proposed by our research team. To reveal the instantaneous ignition characteristics of the LHSI, a simulation model of the LHSI is established and verified by experiments. Based on this, the formation and development of the initial fire core of vaporized kerosene and the ignition characteristics of LHSI in a scramjet combustor were simulated and compared with the conventional high-energy spark igniter (HSI). The analysis revealed that the success of the cavity ignition is greatly influenced by the local equivalent ratio of the initial flow field and the penetration depth of the initial flame core. Meanwhile, the fore recirculation zone of the cavity plays a key role in stabilization and development of the initial fire core. Compared with the HSI, the LHSI can produce initial flame core with higher penetration and greater size, which is the main reason for why LHSI has a broader ignition boundary. © 2024, The Authors. All rights reserved.

关键词： Ignition

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Adaptive Backstepping control for Underactuated 6-DoF USV with Uncertain Dynamics

IEEE Transactions on Intelligent Vehicles

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IEEE Transactions on Intelligent Vehicles 2024年 1-9页

作者： Yu, Kunting Li, Yongming Lv, Maolong Tong, Shaocheng Navigation College Dalian Maritime University Dalian China National Key Laboratory of Unmanned Aerial Vehicle Technology National Key Lab of Aerospace Power System and Plasma Technology the College of Air Traffic Control and Navigation Air Force Engineering University Xi'an China

This paper introduces a target tracking control approach for an underactuated Unmanned Surface Vehicle (USV) with 6 Degrees of Freedom (6-DoF), characterized by unknown dynamics and disturbances. Notably, the system inertia matrix of this 6-DoF USV is positive definite and non-diagonal, implying the presence of intricate coupling relationships within the input vector components. To address the challenges posed by underactuation, we present an adaptive control methodology utilizing a novel transverse function and backstepping procedure. Furthermore, we introduce a dynamic signal to compensate for external dynamic uncertainties and disturbances. Leveraging Lyapunov stability theory, we establish that the target tracking error converges to a small neighborhood near the origin, and all signals within the closed-loop system remain bounded. Lastly, we showcase the effectiveness of the proposed control methodology through simulation results involving a 6-DoF supply vehicle. IEEE

关键词： Target tracking

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FPGA Implementation of HoG-based Space Target Distance Measurement

FPGA Implementation of HoG-based Space Target Distance Measu...

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Image Processing, Electronics and Computers (IPEC), Asia-Pacific Conference on

作者： Yue Ma Jianjun Yi Gengshu Xu Yuanhao Chen Danwei Wang Changchun Zhao School of Mechanical and Power Engineering East China University of Science and Technology Shanghai China Intelligent Unmanned System Control Technology Joint Lab Shanghai China School of Electrical and Electronic Engineering Nanyang Technological University Singapore Shanghai Aerospace Control Technology Institute Shanghai China

ISBN: (纸本)9781728190181;9781728190198

This paper focuses on space cooperative target identification and ranging using monocular CMV4000 CMOS sensor and Xilinx Zynq-7000 Soc based platform without the operating system that adopts Histograms of Oriented Gradients (HOG) descriptor and Support Vector Machine (SVM) for classification. With Vivado High-Level Synthesis to accelerate IF creation by enabling C specifications to be directly targeted into devices, this implementation allows for two high-resolution images (2048×2048 pixels) processing per second. The hardware and software co-design of Xilinx Zynq7000 promises the accuracy of space target classification and distance measurement and thus meets the requirement of realtime space application.

关键词： Support vector machines Histograms Streaming media Feature extraction Extraterrestrial measurements Distance measurement Software

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Multi-Objective Design Optimization and Sensitivity Analysis of Field Emission Electric Propulsion for Cubesat Platforms

SSRN

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SSRN 2024年

作者： Yeo, Suk Hyun Dinaol, Gadisa Ogawa, Hideaki Bang, Hyo-Choong Department of Aeronautics and Astronautics Graduate School of Engineering Kyushu University 744 Motooka Nishi-ku Fukuoka819-0395 Japan Department of Aerospace Engineering The Korea Advanced Institute of Science and Technology KAIST 291 Daejoen34141 Korea Republic of Space Systems Engineering Japan Aerospace System and Control Lab Korea Republic of

Field-emission electric propulsion is an electrostatic space electric propulsion technology that offers various advantageous features including efficient design, high specific impulse, and versatile thrust capabilities ranging from micro-Newton to milli-Newton levels. These characteristics make FEEP a promising technology for small satellite platforms, enabling precise attitude control, orbit maintenance, and de-orbiting through ionization and acceleration of a liquid metal propellant. The growing demand for small propulsion systems in CubeSat platforms has spurred significant progress in modeling and characterizing FEEP thrusters with the aim to enhance their overall performance. However, little study has been conducted to investigate the effect of geometric configurations on electric fields or expelled ion trajectories for design optimization. In this study, multi-objective design optimization is performed by incorporating electrostatic simulation coupled with an analytical performance model into evolutionary algorithms based on prediction from surrogate modeling, aiming to optimize the thruster emission design to maximize thruster performance. Physical insights into the key design factors influencing the performance of FEEP have been gained by probing into the interaction between ion particles and electric field behavior within the thruster. It has been found that the length of the emitter tip has a significant effect on plume divergence, \textit{i.e.,} a longer emitter tip under the influence of electric field at higher emitter current tends to result in lower initial acceleration of emitted ions and subsequently wider spread or divergence of the ion beam. A shorter emitter tip, on the other hand, generates a sharper E-field gradient, resulting in a more focused and narrower ion beam. Additionally, sensitivity analysis has identified the mass flow rate and potential distributions as the most influential design factors on performance due to the active roles they

关键词： Sensitivity analysis

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The Generalized Persistent Monitoring Problem

The Generalized Persistent Monitoring Problem

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American control Conference

作者： S.K.K. Hari S. Rathinam S. Darbha K. Kalyanam S.G. Manyam D. Casbeer Texas A & M University College Station TX 77840 USA System Sciences Lab Palo Alto Research Center (PARC) A Xerox Company CA 94304 USA Autonomous Control Branch Aerospace Systems Directorate Control Science Center of Excellence Wright-Patterson A.F.B. OH 45433 USA

ISBN: (纸本)9781538679012;9781538679265

In this article, we consider the problem of planning an optimal route for an unmanned vehicle, tasked with persistently monitoring a set of targets. The targets are grouped into m subsets, referred to as clusters. To monitor a cluster, the vehicle must collect data from any one target in the cluster, by making a physical visit to the target. The vehicle has a finite fuel capacity, which is specified in terms of the number of visits it can make, at the end of which it must be refueled/recharged at a depot (which is one of the targets). Given k allowed visits for the vehicle, the problem of interest is to plan a closed walk (route) of k visits that can be repeated continuously, such that the maximum time between successive visits to the clusters is minimized (the minimum value is R~*(k)). Here, we prove that for k ≥ m~2-m, R~*(k) takes only two values, R~*(m) when k is an integral multiple of m, and R~*(m+1) otherwise, leading to significant computational savings. We corroborate this result by performing numerical simulations on a Dubins vehicle.

关键词： vehicle Monitoring problem minimum value WAREHOUSE Unmanned vehicles Clusters optimum route

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A 4-Channel Ultrafast Wavelength-Swept REC-DFB Laser Array for Fiber Bragg Grating Interrogation

A 4-Channel Ultrafast Wavelength-Swept REC-DFB Laser Array f...

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2023 Asia Communications and Photonics Conference/2023 International Photonics and Optoelectronics Meetings, ACP/POEM 2023

作者： Meng, Lingxin Dai, Pan Ban, Qilu Xu, Kaichuan Wang, Jiacheng Li, Zhen Wang, Feng Zeng, Jie Li, Shaobo Ma, Xiang Chen, Xiangfei Res. Center of Precision Photonics Integration and System Application of the Ministry of Education College of Engineering and Applied Sciences Nanjing University Key Lab. of Intelligent Optical Sensing and Manipulation of the Ministry of Education Engineering National Laboratory of Solid State Microstructures Nanjing210023 China Nanjing University of Aeronautics and Astronautics State Key Laboratory of Mechanics and Control for Aerospace Structures Nanjing210016 China The 54th Research Institute of China Electronics Technology Group Corporation Optical Communication Research and Development Center Shijiazhuang050081 China

ISBN: (纸本)9798350312614

We present a four-channel ultrafast wavelength-swept distributed feedback (DFB) semiconductor laser array based on the reconstruction-equivalent-chirp (REC) technique using instantaneous injection current modulation. With the aid of our designed laser driving circuit system consists of the microcontroller unit (MCU), field-programmable gate array (FPGA) and negative metal-oxide-semiconductor field effect transistors (n-MOSFETs), the precise pulse driving current for the 4-channel wavelength-swept REC-DFB laser array can be generated and a fast tuning of 16.424 nm within 10 μs is achieved. To further investigate the tuning performance of the proposed wavelength-swept laser source, we then applied it to the fiber Bragg grating (FBG) interrogation system and four FBG temperature sensor arrays were successfully demodulated. The development of high-efficient optical sensing systems heavily relies on the significance of the ultrafast wavelength-swept laser source, which has the potential to greatly enhance FBG interrogator performance in the future. © 2023 IEEE.

关键词： DFB laser array fast wavelength-swept fiber Bragg grating interrogation REC technique

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