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ASME 2024 International Mechanical Engineering Congress and Exposition, IMECE 2024

作者： Bhosale, Yugandhara Sharma, Atul Gupta, Abhishek Vachhani, Leena Department of Mechanical Engineering Indian Institute of Technology Bombay Mumbai India Department of Systems and Control Engineering Indian Institute of Technology Bombay Mumbai India

ISBN: (纸本)9780791888667

A towfish is a passive underwater vehicle that is towed behind a surface vessel. The towfish is often designed to be symmetric from all directions primarily to achieve balanced hydrodynamic behaviour and foreseeable manoeuvrability under water. External attachments or extruded slots can induce asymmetry, which will have an effect on the hydrodynamic behaviour. An asymmetric towfish will experience an uneven distribution of hydrodynamic forces and moments. This will lead to unstable orientation and unpredictable hydrodynamic behaviour. So, the effect of asymmetry on hydrodynamic coefficients like drag coefficients, lift coefficients, pitching moment coefficients and overall stability are investigated in this paper and improved with design modification in towfish. We evaluated these hydrodynamic coefficients of the asymmetric towfish and proposed a redesign strategy. In this work, the significant parts of towfish, like the nose and hull are redesigned to improve hydrodynamic performance. A three-dimensional (3D) simulation is carried out using in Ansys Fluent as a CFD software. To simulate the turbulence, the k-ω shear stress transport (SST) model is employed due to its good prediction capability at a reasonable computational cost. Drag reduction and lift increment are observed with modification and redesigning of the nose and hull to counter the increase in drag due to the asymmetricity of towfish. These results will help to enhance our understanding of the hydrodynamics behavior of the asymmetric nature of towfish. Copyright © 2024 by ASME.

关键词： Computational fluid dynamics

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Exploiting Manifold Turnpikes in Model Predictive Path Following without Terminal Constraints 63

Exploiting Manifold Turnpikes in Model Predictive Path Follo...

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63rd IEEE Conference on Decision and control, CDC 2024

作者： Itani, Mohammad Faulwasser, Timm Hamburg University of Technology Institute of Control Systems Hamburg21073 Germany Energy Efficiency and Energy Economics Tu Dortmund University Institute for Energy Systems Germany

ISBN: (纸本)9798350316339

Model predictive path-following control (MPFC) considers geometric reference paths in output spaces without pre-assigned timing information. It combines trajectory generation and tracking into one receding-horizon optimal control problem. In this paper, we discuss MPFC without terminal constraints from a geometric point of view. Specifically, we consider implicitly parameterized paths and the recently introduced notion of manifold turnpikes to propose sufficient conditions for practical convergence of the system output towards a neighborhood of the reference path. We draw upon a simulation example to demonstrate the efficacy of the proposed scheme. © 2024 IEEE.

关键词： Optimal control systems

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General Tactical Maneuvering Flight Decision and control

General Tactical Maneuvering Flight Decision and Control

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International Conference on Guidance, Navigation and control, ICGNC 2022

作者： Zhang, Ning Wang, Xiaomin Li, Jia National Key Laboratory of Science and Technology on Integrated Technology Control Xi’an710065 China Flight Automatic Control Research Institute AVIC Xi’an710065 China AECC Xi’an Engine Control Technology Co. LTD. Xi’an710065 China

ISBN: (纸本)9789811966125

Aiming at the problem that the control station cannot accurately intervene in real time and when encountering unforeseen threats such as air-to-air/surface-to-air missile attacks in air combat missions, research general tactical maneuver decision and autonomous maneuver control technology, and plan the optimal maneuver combination and maneuver timing to improve the success rate of autonomous missile defense. Establish generalized maneuvering trajectory planning and tracking control capabilities centered on maneuvering decision, solve the problem of quick victory in dynamic tasks, and improve the stealth maneuvering penetration and battlefield survivability of aircraft. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Surface to air missiles

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Research on the Impact of change features for Remote Sensing Image Change Detection 12

Research on the Impact of change features for Remote Sensing...

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SPIE 12th International Symposium on Multispectral Image Processing and Pattern Recognition, MIPPR 2023

作者： Mu, HaoDong Li, Haipeng Chen, Zhong Huazhong University of Science and Technology 1037 Luoyu Road HuBei WuHan430074 China Beijing Aerospace Automatic Control Institute Bejing100854 China

ISBN: (数字)9781510675001

ISBN: (纸本)9781510674998

As remote sensing technology continues to advance, the accuracy and quantity of remote sensing images have significantly improved. The generation of a vast amount of available data has facilitated the widespread application of various deep learning methods in the field of remote sensing data processing, such as object detection, semantic segmentation, and change detection. In the aforementioned tasks, Change detection is used to identify alterations occurring on the Earth's surface by utilizing remote sensing (RS) data. In recent years, deep learning based methods have exhibited significantly superior performance compared to traditional change detection techniques. The fundamental strategy enabling these advancements involves extracting appropriate deep learning features from input remote sensing images through various backbone networks such as VGG, ResNet, DenseNet etc. Nevertheless, the features extracted by the aforementioned backbone networks may not fully cater to the specific requirements of remote sensing image change detection tasks. Consequently, our goal is to explore the influence of features extracted by different backbone networks on change detection tasks and introduce a specialized backbone network tailored for change detection. This endeavor aims to produce features that are better suited for the of change detection. The experimental results indicate that our specifically designed feature extraction network for remote sensing image change detection outperforms traditional networks in extracting task-specific features. These features are better suited for subsequent decoder modules, enhancing the generation of image-based change detection results. At the same time, we found that when using general backbone networks for change detection, ResNet achieves the highest metric accuracy, while DenseNet has the lowest memory usage and the fastest training and testing speed. Depending on the specific task, we can choose the appropriate backbone network as need

关键词： Feature extraction

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Integrated Guidance and control System Design for Hypersonic Vehicle Based on Backstepping High-Order Sliding Mode Approach 42

Integrated Guidance and Control System Design for Hypersonic...

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42nd Chinese control Conference, CCC 2023

作者： Zhuo, Xiaobin Zhang, Xiangyin Yu, Yue Beijing University of Technology Faculty of Information Technology Beijing100124 China Beijing Aerospace Automatic Control Institute Beijing100854 China

ISBN: (纸本)9789887581543

A six-degree-of-freedom (6DOF) control scheme is proposed for the glide phase of hypersonic vehicle. Based on hypersonic vehicle motion and engagement model, the 3D integrated guidance and control (IGC) model is constructed. The backstepping-high order sliding mode (BHOSM) control scheme is proposed based on backstepping method and the high-order sliding mode (HOSM) method. The backstepping controller is designed to solve the problem of under-actuation in the IGC model. The HOSM controller is designed to overcome the uncertainty, strong coupling and nonlinear problems of IGC system. According to Lyapunov's theorem, the states of the closed loop system are proved to be uniform bounded. Finally, the effectiveness and reliability of the proposed method is verified and studied by simulation experiments. © 2023 Technical Committee on control Theory, Chinese Association of Automation.

关键词： Backstepping

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Multi-Agent Hierarchical Decision Optimization Method Based on Curriculum Learning 9

Multi-Agent Hierarchical Decision Optimization Method Based ...

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9th International Conference on Big Data and Information Analytics, BigDIA 2023

作者： Liang, Wenqian Huang, Chengqi Zhang, Yong Zhang, Zhuxin Yang, Xiaolong Zhang, Pengcheng National University of Defense Technology Laboratory for Big Data and Decision Changsha China North Automatic Control Technology Institute Taiyuan China

ISBN: (纸本)9798350330076

The huge state space and varying action space will make the decision-making be a grand challenge for reinforcement learning. To address this problem, we propose a multi-agent hierarchical decision optimization algorithm, which utilizes macro-action abstraction based on expert experience knowledge and hierarchical abstraction based on hierarchical reinforcement learning theory to decompose the combat task into different hierarchical sub-task modules. The alternating update method is used to learn and train the network. Meanwhile, combined with the curriculum learning method, the training process of the neural network model can be improved. The algorithm is validated in the full-length game of StarCraft II. When playing against the built-in AI of level 7 difficulty, it achieved a win rate of over 93%. The experimental results show that it can effectively improve the collaborative ability of the decision-making model when the state space and the optional action space are huge and the decision-making process is complex. © 2023 IEEE.

关键词： Decision making

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Coupled Output Synchronization for Leader-Follower Vehicle Platooning 8

Coupled Output Synchronization for Leader-Follower Vehicle P...

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8th International Conference on Robotics and Automation Engineering, ICRAE 2023

作者： Sinha, Pallavi Dutta, Maitreyee Srikant, Sukumar Systems and Control Engineering Indian Institute of Technology Bombay Powai Mumbai400076 India

ISBN: (纸本)9798350327656

A novel framework in multi-agent system networks is introduced and analyzed in this article, namely coupled output synchronization over directed graph topologies. Under assumptions of a rooted spanning tree, we design a distributed control law for synchronization of Laplacian coupled outputs of double integrator dynamics. The analysis of the closed-loop systems communicating over digraphs is carried out via Lyapunov methods. The vehicle platooning problem is demonstrated as a direct application of our results on coupled output synchronization. The control is distributed and independent of the knowledge of eigenvalues of the graph Laplacian. Simulations verify the performance of the controller with and without disturbance. © 2023 IEEE.

关键词： Multi agent systems

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Path-Complete Barrier Functions for Safety of Switched Linear systems 63

Path-Complete Barrier Functions for Safety of Switched Linea...

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63rd IEEE Conference on Decision and control, CDC 2024

作者： Anand, Mahathi Jungers, Raphael Zamani, Majid Allgower, Frank Institute for Systems Theory and Automatic Control University of Stuttgart Germany Université Catholique de Louvain Department of Mathematical Engineering Belgium University of Colorado Boulder United States

ISBN: (纸本)9798350316339

In this paper, we address the safety verification problem of switched linear dynamical systems under arbitrary switching via barrier functions. Our approach is based on a notion of path-complete barrier functions, which utilizes a collection of barrier functions associated with a directed labeled graph that can encode all the possible switching sequences. We show that path-complete barrier functions effectively generalize notions of common and multiple barrier functions studied in existing literature, and can potentially provide less conservative conditions for safety verification. We demonstrate that, for switched linear systems, the inequalities imposed via path-complete barrier functions can be easily encoded into simple linear matrix inequalities under some assumptions on the regions of interest and appropriately chosen templates for the barrier functions. We also study the relationship between path-complete barrier functions and common barrier functions, and show that for any path-complete graph with an admissible path-complete barrier function, one can derive a suitable (possibly non-smooth) common barrier function by utilizing the path-complete barrier function. Finally, we utilize several examples to illustrate the effectiveness of our approach, and briefly discuss the challenges that lay foundations for future research. © 2024 IEEE.

关键词： Directed graphs

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Reduced order model with non-linear parameter optimization for hydrogen combustion engine control

Reduced order model with non-linear parameter optimization f...

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2023 IEEE Conference on control technology and Applications, CCTA 2023

作者： Kluge, Kevin Pehlivanlar, Benjamin Wenzel, Henrik Gunther, Marco Pischinger, Stefan Abel, Dirk Rwth Aachen University Institute of Automatic Control Germany Rwth Aachen University Chair of Thermodynamics of Mobile Energy Conversion Systems Germany

ISBN: (纸本)9798350335446

Using hydrogen as a fuel in spark ignition (SI) internal combustion engines offers an environmentally friendly alternative to fossil fuels, while retaining many benefits of conventional powertrains. Even though the hydrogen SI engine can rely on mature mechanical parts from conventional gasoline engines, the control software has to be adapted to the change in fuel. This includes a rapid switching between lean and stochiometric operation while ensuring engine protection and very low pollutant emissions. A model predictive controller (MPC) offers the possibility to systematically consider opposing control objectives and constraints for transient operation while reducing the development and calibration effort. As a basis for the real-time capable MPC, a reduced order physical model with empirical components is developed to describe the processes in the combustion chamber. Taking single cylinder engine testbench measurements into account from early stages of the engine development, some of the model's parameters are optimized to increase prediction accuracy. The resulting non-linear parameter optimization reduces the mean square errors of the main outputs relative air-fuel-ratio and indicated mean effective pressure from 0.1475 and 0.5426 bar2 to 0.0218 and 0.1020 bar2 within a wide operating area. © 2023 IEEE.

关键词： Hydrogen

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Multi-objective robust controller synthesis with integral quadratic constraints in discrete-time

arXiv

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arXiv 2025年

作者： Schwenkel, Lukas Köhler, Johannes Müller, Matthias A. Scherer, Carsten W. Allgöwer, Frank University of Stuttgart Institute for Systems Theory and Automatic Control Germany ETH Zürich Institute for Dynamical Systems and Control Switzerland Leibniz University Hannover Institute for Automatic Control Germany University of Stuttgart Department of Mathematics Germany

This article presents a novel framework for the robust controller synthesis problem in discrete-time systems using dynamic Integral Quadratic Constraints (IQCs). We present an algorithm to minimize closed-loop performance measures such as the H∞-norm, the energy-to-peak gain, the peak-to-peak gain, or a multi-objective mix thereof. While IQCs provide a powerful tool for modeling structured uncertainties and nonlinearities, existing synthesis methods are limited to the H∞-norm, continuous-time systems, or special system structures. By minimizing the energy-to-peak and peak-to-peak gain, the proposed synthesis can be utilized to bound the peak of the output, which is crucial in many applications requiring robust constraint satisfaction, input-to-state stability, reachability analysis, or other pointwise-in-time bounds. Numerical examples demonstrate the robustness and performance of the controllers synthesized with the proposed algorithm. Copyright © 2025, The Authors. All rights reserved.

关键词： Robust control

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