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arXiv 2024年

作者： Ye, Tianyong Xu, Wei Zheng, Chunran Cui, Yukang The College of Mechatronics and Control Engineering Shenzhen University Shenzhen518060 China The Peng Cheng Laboratory Shenzhen518000 China The Manifold Tech Limited Hong Kong The department of Mechanical Engineering The University of Hong Kong Hong Kong

This paper presents MFCalib, an innovative extrinsic calibration technique for LiDAR and RGB camera that operates automatically in targetless environments with a single data capture. At the heart of this method is using a rich set of edge information, significantly enhancing calibration accuracy and robustness. Specifically, we extract both depth-continuous and depth-discontinuous edges, along with intensity-discontinuous edges on planes. This comprehensive edge extraction strategy ensures our ability to achieve accurate calibration with just one round of data collection, even in complex and varied settings. Addressing the uncertainty of depth-discontinuous edges, we delve into the physical measurement principles of LiDAR and develop a beam model, effectively mitigating the issue of edge inflation caused by the LiDAR beam. Extensive experiment results demonstrate that MFCalib outperforms the state-of-the-art targetless calibration methods across various scenes, achieving and often surpassing the precision of multi-scene calibrations in a single-shot collection. To support community development, we make our code available open-source on GitHub. Copyright © 2024, The Authors. All rights reserved.

关键词： Calibration

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Batch constrained multi-objective Bayesian optimization using the example of ultrasonic wire bonding

Batch constrained multi-objective Bayesian optimization usin...

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IEEE/ASME (AIM) International Conference on Advanced Intelligent mechatronics

作者： Fabian Reiling Christian Henke Matthias Hunstig Stefan Gröger Ansgar Trächtler department Scientific Automation Fraunhofer Institute for Mechatronic Systems Design Paderborn Germany Deputy Head of Research at Hesse GmbH Paderborn Germany Head of Chair of Control Engineering and Mechatronics Paderborn Germany

ISBN: (数字)9798350355369

ISBN: (纸本)9798350355376

Setting optimum process parameters for complex manufacturing processes such as ultrasonic wire bonding is already challenging for one target variable. Due to numerous influencing physical factors, such processes often lack the necessary detailed physical models. Due to the lack of these models, such processes cannot be adjusted to an optimum using classic optimization methods. In manufacturing processes in particular, the process must be optimized with regard to several objectives such as process time or quality. A popular method for optimizing such processes without models is multi-objective Bayesian optimization. For this purpose, surrogate models in the form of Gaussian processes are used in combination with a multi-objective acquisition function. In real processes, parallel function evaluation offers advantages in terms of trial efficiency and scalability. In this paper, we present a new algorithm for batch-constrained Bayesian multi-objective optimization. With this algorithm, an arbitrary number of function evaluations per iteration can be specified, whereby a more efficient determination of the Pareto front approximation can be achieved in real applications. For this purpose, the Expected Hypervolume Improvement is extended by a term to consider a quality criterion. Using the ultrasonic wire bonding process as an example, we experimentally prove that the proposed framework is able to approximate the Pareto front of the system with only a few function evaluations. For this purpose, the process capability index should be maximized and the process time minimized.

关键词： Manufacturing processes mechatronics Scalability Optimization methods Predictive models Approximation algorithms Acoustics

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Serrated chip formation in machining of difficult to cut metallic materials: a comprehensive review

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Critical Reviews in Solid State and Materials Sciences 2025年

作者： Zhao, Zejia Liu, Chujun Xu, Bo Wang, Jingwei Yao, Yingxue Yin, Tengfei To, Suet Yang, Yang Institute of Semiconductor Manufacturing Research College of Mechatronics and Control Engineering Shenzhen University Shenzhen China State Key Laboratory of Ultra-precision Machining Technology Department of Industrial and Systems Engineering The Hong Kong Polytechnic University Kowloon Hong Kong Department of Materials Science Shenzhen MSU-BIT University Shenzhen China Shenzhen China

Serrated cutting chips are usually observed in the machining of difficult to cut metallic materials such as titanium alloys, steels, and nickel-based alloys. Understanding the formation mechanism and influencing factors to generate serrated chips is meaningful for improving the machinability of the difficult to cut materials since the formation of serrated chips poses high risks on the vibration of cutting tools and further affects the surface quality of the workpiece. To date, extensive studies have been conducted on the investigation of serrated chip formation in the machining of difficult to cut materials, but there is still a lack of a comprehensive review to clarify the formation mechanism and summarize the factors affecting the serrated chip characteristics. In this review, two commonly used mechanisms, i.e., adiabatic shear band (ASB) theory and periodical crack formation (PCF) theory, are summarized and discussed with respect to theoretical analyses and experimental verifications. Serrated chip formation in different difficult to cut alloys was also systematically reviewed, considering materials inherent properties such as high hardness, poor thermal conductivity, or low fracture toughness. Besides, some critical factors, including cutting speeds, feed rates, cutting tools, external energy sources, humidity, and temperature are highlighted to illustrate their effects on the serrated chip formation. In addition, challenges and perspectives about the serrated chip formation in machining of difficult to cut metallic materials are proposed to give instruction to future research. © 2025 Taylor & Francis Group, LLC.

关键词： Titanium alloys

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System Identification and Position control of Pneumatic Actuator

System Identification and Position Control of Pneumatic Actu...

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IEEE International Conference on Smart Instrumentation, Measurement and Applications (ICSIMA)

作者： Sami Ibad Lababidi Shafishuhaza Sahlan Mohamed Naji Muftah Ahmad ‘Athif Mohd Faudzi Fuead Ali Control Mechatronics & Engineering Department Faculty of Electrical Engineering Universiti Teknologi Malaysia Skudai. Johor Malaysia Malaysian Institute of Information Technology University Kuala Lumpur Kuala Lumpur

In this paper, to improve the system's performance for precise control of the developed pneumatic cylinder model, a proportional-integral-derivative (PID) controller is designed. The paper demonstrates that by using the obtained mathematical model and implementing the PID controller through the developed human-machine interface (HMI) in MATLAB, precise position control of the pneumatic actuator can be achieved, overcoming the challenges posed by the nonlinear behaviour of pneumatic actuators and leading to improved system performance in various industrial industrial applications. The PID model was optimized using both the Auto tuning and Ziegler-Nichols tuning methods, resulting in the best performance with response times of 0.534 seconds (T s ), 0.375 seconds (T r ), and an overshoot of 0.0799% (OS%).

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Design of adaptive intuitionistic fuzzy controller for synchronisation of uncertain chaotic systems

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CAAI Transactions on Intelligence Technology 2020年第4期5卷 237-246页

作者： Mohamed Hamdy Salah Helmy Mohamed Magdy Department of Industrial Electronics and Control Engineering Faculty of Electronic EngineeringMenoufia UniversityMenouf-32952Egypt Department of Mechatronics Engineering Higher Institute of Engineering and TechnologyEl-Mahalla El-Kobra-31951Egypt

This study presents the synchronisation between two non-linear Lorenz chaotic systems using an adaptive intuitionistic fuzzy controller(AIFC).This problem is solved in the presence of external disturbances and *** classes of Lorenz systems have been formulated one as the master and the other as the *** master and slave systems have different initial *** different initial conditions,both systems *** is called the butterfly effect that rules the behaviour of chaotic *** is chosen as a different method that has not been used before to synchronise the chaotic *** scaling factors of the inputs and the output of the intuitionistic fuzzy controller(IFC)are tuned using the artificial bee colony(ABC)algorithm depending on a specified objective *** IFC stability is studied when it is applied to synchronise the Lorenz *** simulation results achieved to assess the adequacy of the proposed control and to exhibit its dependability to synchronise the Lorenz system.

关键词： function. chaotic specified

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Bidirectional Multi-Stack RNNs with Attention for Machine Translation

Bidirectional Multi-Stack RNNs with Attention for Machine Tr...

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On-Line Conference (ONCON), Industrial Electronics Society Annual

作者： Zhiren Chen Ziyu Qiu Nuo Chen the Department of Mechanical & Industrial Engineering University of Toronto Toronto Canada Faculty of Computer Science Dalhousie University Halifax Canada Department of Mechanical Engineering Advanced Control and Mechatronics Lab Dalhousie University Halifax Canada

This project developed a novel attention algorithm for multi-stack bidirectional encoder-decoder RNN (including GRU and LSTM) sequence-to-sequence models, particularly for language translation tasks. The attention mechanism utilizes matrix rearranging and multiplication to compute the significance of the vectors in the encoder output to the vectors in the current decoder hidden states when predicting each word. Our approach achieved 98% of the performance of fine-tuned pretrained T5-small, with 30% to 50% fewer parameters depending on vocabulary size, making our model an ideal choice in cases of single-processor training, low processor resource, limited memory, small dataset, or tasks not supported by pretrained transformers.

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Dc Leakage Current in Isolated Grid-Connected dc Nanogrid - Origins and Elimination Methods

Dc Leakage Current in Isolated Grid-Connected dc Nanogrid - ...

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Compatibility in Power Electronics (CPE)

作者： Mohammadreza Azizi Oleksandr Husev Oleksandr Veligorskyi Marek Turzvński Ryszard Strzelecki Department of Radiotechnic and Embedded Systems Chernihiv Polytechnic National University Chernihiv Ukraine Department of Electric Electronic and Automation Engineering University of Extremadura Badajoz Spain Department of Electrical Power Engineering and Mechatronics Tallinn University of Technology Tallinn Estonia Faculty of Electrical and Control Engineering Gdansk University of Technology Gdansk Poland

ISBN: (数字)9798350318265

ISBN: (纸本)9798350318272

The LV dc system is a relatively new trend in the distribution sector, which seems to grow widely in the near future due to its promising advantages. In this context, LV dc protection and grounding are challenging issues. Although the galvanically isolated connection mode of dc nanogrid to the ac grid has high reliability, the leakage current can still be injected into the ac grid through the interwinding capacitors and the insulation resistance between the primary and secondary windings of the transformer. The way of grounding the dc nanogrid can also be a determining factor in the leakage current and its dc components. This study deals with the leakage current in the galvanically isolated dc nanogrid. Then, it examines the dc leakage current and its relationship with the dc nanogrid grounding and finally provides solutions to remove the dc components in the leakage current.

关键词： Resistance Insulation Grounding Simulation Windings Capacitors Leakage currents

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PIEZOELECTRIC SHUNT DAMPING IN CRYOGENIC CONDITIONS: APPLICATION TO A FLEXURE-BASED MECHANISM 36

PIEZOELECTRIC SHUNT DAMPING IN CRYOGENIC CONDITIONS: APPLICA...

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36th Annual Meeting of the American Society for Precision engineering, ASPE 2021

作者： Ambaum, N. Vermeulen, J.P.M.B. Mokrani, B. Department of Mechanical Engineering Control Systems Technology group – Mechatronic Systems Design Eindhoven University of Technology Eindhoven Netherlands Mechatronics Department ASML Netherlands Veldhoven Netherlands

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Non-Convex Potential Games for Finding Global Solutions to Sensor Network Localization

Non-Convex Potential Games for Finding Global Solutions to S...

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European control Conference (ECC)

作者： Gehui Xu Guanpu Chen Yiguang Hong Baris Fidan Thomas Parisini Karl H. Johansson Key Laboratory of Systems and Control Academy of Mathematics and Systems Science Beijing China Division of Decision and Control Systems School of Electrical Engineering and Computer Science KTH Royal Institute of Technology Stockholm Sweden Department of Control Science and Engineering Tongji University Shanghai China Shanghai Research Institute for Intelligent Autonomous Systems Shanghai China Department of Mechanical and Mechatronics Engineering University of Waterloo Waterloo ON Canada Department of Electrical and Electronic Engineering Imperial College London London UK Department of Engineering and Architecture University of Trieste Trieste Italy

ISBN: (数字)9783907144107

ISBN: (纸本)9798331540920

Sensor network localization (SNL) problems require determining the physical coordinates of all sensors in a network. This process relies on the global coordinates of anchors and the available measurements between non-anchor and anchor nodes. Attributed to the intrinsic non-convexity, obtaining a globally optimal solution to SNL is challenging, as well as implementing corresponding algorithms. In this paper, we formulate a non-convex multi-player potential game for a generic SNL problem to investigate the identification condition of the global Nash equilibrium (NE) therein, where the global NE represents the global solution of SNL. We employ canonical duality theory to transform the non-convex game into a complementary dual problem. Then we develop a conjugation-based algorithm to compute the stationary points of the complementary dual problem. On this basis, we show an identification condition of the global NE: the stationary point of the proposed algorithm satisfies a duality relation. Finally, simulation results are provided to validate the effectiveness of the theoretical results.

关键词： Location awareness Coordinate measuring machines Simulation Current measurement Noise Europe Games

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Accurate Active and Unbalanced Harmonic Power Sharing of Islanded Microgrid Based on Small-AC-Signal Injection

Accurate Active and Unbalanced Harmonic Power Sharing of Isl...

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Chinese control and Decision Conference, CCDC

作者： Yiyun Li Zhi Zhang Haohui Chen Huaizhi Wang Bin Ren Department of Electrical Engineering and Automation Dongguan University of Technology Dongguan College of Mechatronics and Control Engineering Shenzhen University Shenzhen China

ISBN: (纸本)9781665478977

The structure of islanded microgrids is complex and has many problems. For this problem of equalizing the fundamental active power, many articles use the traditional droop control, which cannot simulate the physical characteristics of inertia and damping in the power generation process, which are considered by the virtual synchronous generator (VSG) technology. The mismatch of the feeder impedance can lead to the inequality of unbalanced harmonic power for the parallel inverters. To address this problem, a control method is proposed that injects an additional small AC signal (SACS)into the output voltage of each inverter and adds an adaptive virtual impedance. This method is similar to the conventional active-frequency droop control, where the output frequency of the injected SACS is linearly related to the output unbalanced harmonic power. When the unbalanced harmonic power rises, the output frequency of the injected signal also rises. And the virtual impedance on the negative sequence series is adjusted by detecting the active power generated by the injected SACS. When the system is stable, the frequency of the injected SACS in each inverter will be the same, and the sum of the virtual inductance and the feeder inductance of each inverter will be the same. The active power and the unbalanced harmonic power of the parallel distributed generator set can be equally shared without communication.

关键词： Damping Inductance Microgrids Power system harmonics Harmonic analysis Inverters Synchronous generators

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