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A generative deep learning framework for inverse design of compositionally complex bulk metallic glasses

npj Computational Materials 2023年第1期9卷 2196-2203页

作者： Ziqing Zhou Yinghui Shang Xiaodi Liu Yong Yang Department of Mechanical Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong KongChina City University of Hong Kong(Dongguan) 523000 DongguanChina College of Mechatronics and Control Engineering Shenzhen University518060 ShenzhenChina Department of Materials Science and Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong KongChina Department of Advanced Design and System Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong KongChina

The design of bulk metallic glasses(BMGs)via machine learning(ML)has been a topic of active research ***,the prior ML models were mostly built upon supervised learning algorithms with human inputs to navigate the high dimensional compositional space,which becomes inefficient with the increasing compositional complexity in ***,we develop a generative deep-learning framework to directly generate compositionally complex BMGs,such as high entropy *** framework is built on the unsupervised Generative Adversarial Network(GAN)algorithm for data generation and the supervised Boosted Trees algorithm for data *** studied systematically the confounding effect of various data descriptors and the literature data on the effectiveness of our framework both numerically and *** importantly,we demonstrate that our generative deep learning framework is capable of producing composition-property mappings,therefore paving the way for the inverse design of BMGs.

关键词： inverse metallic entropy

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Non-Line-of-Sight Footstep Localization for Autonomous Mobile Robots

Non-Line-of-Sight Footstep Localization for Autonomous Mobil...

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mechatronics and Robotics Engineering (ICMRE), International Conference on

作者： Moeka Yoshinari Masaki Takahashi Yusuke Hioka School of Science for Open and Environmental Systems Keio University Yokohama Japan Department of System Design Engineering Keio University Yokohama Japan Department of Mechanical and Mechatronics Engineering Acoustics Research Centre University of Auckland Auckland New Zealand

ISBN: (数字)9798350394276

ISBN: (纸本)9798350394283

Autonomous mobile robots (AMRs) perform tasks in various industrial applications to enhance productivity and reduce labor costs. To ensure the safety of humans sharing spaces with robots in operation, most AMRs use visual sensors to avoid collision by detecting humans and obstacles. However, when humans are outside the robot’s field of vision, the robot should mitigate the risk of collision by sensing humans’ presence before they enter the robot’s visual range. In this study, we propose a non-line-of-sight sound source localization algorithm that can be applied to collision avoidance for AMRs. The range of human detection for robots can be increased using auditory sensors. To localize the position of a human in a non-line-of-sight area, such as behind a corner of a corridor, we use direction-of-arrival (DOA) estimation of reflection sounds and the ray tracing method. Performance evaluations in real life were performed to verify the possibility of its implementation in practical scenes.

关键词： Location awareness Visualization Service robots Estimation Robot sensing systems Sensors Safety

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Overcoming Performance Limitations of Linear Control with Hybrid Integrator-Gain systems ⁎

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IFAC-PapersOnLine 2021年第5期54卷 289-294页

作者： D. van Dinther B. Sharif S.J.A.M. van den Eijnden H. Nijmeijer M.F. Heertjes W.P.M.H. Heemels Department of Mechanical Engineering Eindhoven University of Technology The Netherlands Mechatronics System Design Department ASML The Netherlands

It is well-known that the performance of linear time-invariant (LTI) feedback control is hampered by fundamental limitations. In this paper, it is shown that by using a so-called hybrid integrator-gain system (HIGS) in the controller, important fundamental LTI performance limitations can be overcome. In particular, in this paper, we show this for two well-known limitations, where overshoot in the step-response of the system has to be present for any stabilizing LTI controller. For each case, it is shown that by using HIGS-based control, one can avoid overshoot in the step-response of the system. Key design considerations for HIGS-based controllers as well as the stability of the resulting closed-loop interconnections are discussed.

关键词： Hybrid integrator-gain systems Fundamental performance limitations LTI control

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Integrated Control of Steering and Braking for Effective Collision Avoidance with Autonomous Emergency Braking in Automated Driving

Integrated Control of Steering and Braking for Effective Col...

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Mediterranean Conference on Control and Automation (MED)

作者： Dekun Wang Kaveh Nazem Tahmasebi DeJiu Chen Department of Machine Design School of Industrail Engineering and Management Mechatronics and Embedded Control System Unit KTH Royal Institute of Technology Stockholm Sweden

ISBN: (数字)9781665406734

ISBN: (纸本)9781665406741

This paper presents a control approach allowing a tight integration of several driver assistance functions in automotive vehicles, including front steering, differential braking and autonomous emergency braking. The goal is to support a more effective collision avoidance with necessary emergency maneuvers during automated driving, while avoiding situations with a high risk of undesired vehicle instability due to separated steering and braking actions. The approach adopts a Model Predictive Control (MPC) based methodology using a set of performance indexes calculated according to the actual time to collision, braking and steering capabilities. The effectiveness of the proposed methodology is evaluated in a simulation on MATLAB/Simulink.

关键词： Uncertainty Tracking Dynamics Optimal control Performance analysis Risk management Vehicle dynamics

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Pixel-Level Sea Ice Concentration Retrieval from Sentinel-1 SAR Imagery and Ancillary Data via Regional Loss Representations

Pixel-Level Sea Ice Concentration Retrieval from Sentinel-1 ...

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OCEANS

作者： Xinwei Chen Muhammed Patel Linlin Xu Yuhao Chen David A. Clausi K. Andrea Scott Weimin Huang School of Marine Science and Engineering South China University of Technology Department of System Design Engineering Vision and Image Processing Lab University of Waterloo Department of Mechanical & Mechatronics Engineering University of Waterloo Faculty of Engineering and Applied Science Memorial University of Newfoundland St. John's NL Canada

ISBN: (数字)9798350362077

ISBN: (纸本)9798350362084

The automated monitoring and high resolution mapping of Arctic sea ice concentration (SIC) from synthetic aperture radar (SAR) images are crucial for various purposes, such as tactical navigation. However, the available labels for training deep learning-based SIC estimation models are mostly in coarse spatial resolution. This study tackles this key issue by proposing a novel loss calculation algorithm during model training. Consequently, a U-Net-based model can produce fine-grained SIC estimates via direct learning from ice charts in low resolution. The proposed method is evaluated with the recently release AI4Arctic Sea Ice Challenge Dataset with more than 500 Sentinel-1 SAR imager and associated ice charts. Visual interpretation and numerical results demonstrate the outstanding performance of the proposed method in terms of SIC mapping resolution. The effectiveness of incorporating multi-source ancillary data in performance improvement is also validated.

关键词： Training Visualization Sentinel-1 Estimation Radar polarimetry Numerical models Spatial resolution

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Rational design of chemically complex metallic glasses by hybrid modeling guided machine learning

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npj Computational Materials 2021年第1期7卷 1242-1251页

作者： Z.Q.Zhou Q.F.He X.D.Liu Q.Wang J.H.Luan C.T.Liu Y.Yang Department of Mechanical Engineering College of EngineeringCity University of Hong KongKowloonHong KongChina College of Mechatronics and Control Engineering Shenzhen UniversityShenzhenChina Laboratory for Structures Institute of Materials ScienceShanghai UniversityShanghaiChina Department of Materials Science and Engineering College of EngineeringCity University of Hong KongKowloonHong KongChina Department of Advanced Design and System Engineering College of EngineeringCity University of Hong KongChina

The compositional design of metallic glasses(MGs)is a long-standing issue in materials science and ***,traditional experimental approaches based on empirical rules are time consuming with a low *** this work,we successfully developed a hybrid machine learning(ML)model to address this fundamental issue based on a database containing~5000 different compositions of metallic glasses(either bulk or ribbon)reported since *** the prior works relying on empirical parameters for featurization of data,we designed modeling guided data descriptors in line with the recent theoretical models on amorphization in chemically complex alloys for the development of the hybrid classification-regression ML *** hybrid ML modeling was validated both numerically and *** importantly,it enabled the discovery of MGs(either bulk or ribbon)through the ML-aided deep search of a multitude of quaternary to scenery alloy *** computational framework herein established is expected to accelerate the design of MG compositions and expand their applications by probing the complex and multi-dimensional compositional space that has never been explored before.

关键词： alloy glasses metallic

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Local Morphology Change of Tpms Structure for the design of Functionally Graded Porous Media

SSRN

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SSRN 2022年

作者： Lee, Jun-Won Oh, Seo-Hyeon Jeon, Eunji Kim, Jungwoo Park, Keun Department of Mechanical System Design Engineering Seoul National University of Science and Technology Seoul01811 Korea Republic of Mechatronics Research Institute Samsung Electronics Co. Ltd. Gyeonggi-do 18448 Korea Republic of

A triply periodic minimal surface (TPMS) is a surface-type cellular structure expressed using trigonometric combinations of sinusoidal functions. TPMS-based solid structures are generally designed by defining the signed distance field (SDF) for periodically repeated unit cells, enabling constructing uniform cellular structures. In this study, a novel design methodology is proposed to locally change the morphology of a TPMS structure for design of a functionally graded porous medium. Mathematical filtering was performed to change the SDF distribution through a superposition of multiple sigmoid functions, thus locally changing the TPMS geometry. The proposed local filtering was then implemented in the design of a TPMS flow channel to reduce the flow resistance in the inlet and outlet regions of the channel. Pressure drop tests were conducted using additively manufactured TPMS channels, and the results showed that the pressure drop decreased by 20% for the filtered design with a volume change of only 2.6%. Flow visualization experiments and numerical simulations were performed to analyze the cause of reduced flow resistance in the locally filtered regions. Considering that a TPMS structure has a complex geometry, the proposed filtering method offers an efficient approach for functionally changing the morphology of the TPMS structure. © 2022, The Authors. All rights reserved.

关键词： Porous materials

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Thermal Management of Large-Sized Lifepo4 Pouch Cell Using Simplified Mini-Channel Cold Plates

SSRN

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SSRN 2023年

作者： Kausthubharam Koorata, Poornesh Kumar Panchal, Satyam Department of Mechanical Engineering Seoul National University Seoul08826 Korea Republic of Electrochemical Energy System Design Lab Department of Mechanical Engineering National Institute of Technology Karnataka Surathkal Mangalore575 025 India Mechanical and Mechatronics Engineering Department University of Waterloo 200 University Avenue West WaterlooONN2L 3G1 Canada

An efficient, simplified mini-channel cooling plate-based thermal management system is presented for LiFePO4 pouch cell. The proposed design improves the uniformity in surface temperature difference by more than 100% compared to existing literature data on similar designs. The proposed coolant design is tested for temperature distribution and cooling efficiency parameters by varying the cooling fluid volume flow rate and inlet temperatures from 15ml/min to 150ml/min and 5°C to 35°C, respectively. The proposed design maintains the maximum temperature in the cell well below 40ºC even under a 4C discharge rate and a high coolant inlet temperature of 35ºC. Increasing the coolant temperature is observed to positively impact the temperature homogeneity in the pouch cell. Further, an increase in cooling liquid flow rate is observed to have a reduced impact on the maximum temperature reduction at all discharge rates. The proposed simple design can be scaled to modular packs of pouch cells. © 2023, The Authors. All rights reserved.

关键词： Flow patterns

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Quality Monitoring Methodology for Micro-Shrinkage of Thick-Walled Injection Molded Components

SSRN

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SSRN 2022年

作者： Huang, Ming-Shyan Chen, Jian-Yu Xiao, Yu-Qi Department of Mechatronics Engineering National Kaohsiung University of Science and Technology 1 University Road Yanchao Dist. Kaohsiung City824 Taiwan Bachelor’s Program of Precision System Design Feng Chia University 100 Wenhwa Road Seatwen Taichung City40724 Taiwan

Sink mark degrades the surface quality of the thick-walled injection molded components. An effective method for quantifying sink marks, and predicting the occurrence of such defects as a function of the injection molding process parameters, are of significant interest in improving the molding quality. The present study proposes a method for measuring the micro-shrinkage using a simple image-processing technique. Simulation and experimental trials are performed to investigate the effects of injection molding parameters on the quality of the polymer melt (as evaluated using quality indexes extracted from the pressure profiles within the chamber and the tie-bar elongation, respectively) and the quality of the final molded component. The sink mark is determined mainly by the holding pressure. The quality indexes revealed in this study are all highly correlated with micro-shrinkage. They provide a viable means of predicting the formation of sink marks and excessive micro-shrinkage in thick-walled injection molded components. © 2022, The Authors. All rights reserved.

关键词： Injection molding

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Hybrid Integrator-Gain system for Active Vibration Isolation with Improved Transient Response

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IFAC-PapersOnLine 2019年第15期52卷 454-459页

作者： Marcel Heertjes Sebastiaan van den Eijnden Bardia Sharif Maurice Heemels Henk Nijmeijer Mechanical Engineering Department Eindhoven University of Technology The Netherlands Mechatronics System Design Department ASML The Netherlands

In this paper a linear bandpass filter is compared to a hybrid integrator-gain based bandpass filter regarding its usefulness in active vibration isolation. Vibration isolation refers to a form of skyhook damping in which a velocity output signal from a system having structural dynamics is fed back to a controller, the latter having bandpass characteristics. At those frequencies where the controller passes the input signal (after gain multiplication) a force proportional to velocity is obtained that can be used to provide active damping to the system, i.e., damping of one (or more) of its structural modes. Outside this frequency band the controller input signal is attenuated, which is often desirable in view of incorrect sensor information at low frequencies and/or to avoid amplification of high-frequency noise. In this context, the use of a hybrid integrator-gain system will be studied regarding its possible phase advantages compared to linear integrators. These advantages stem from the control design itself, in the sense that by design the control output force signal and the input velocity error signal have equal sign. In the context of vibration control, an enhanced transient (closed-loop) response is obtained, i.e., less overshoot and reduced settling times, but at the cost of increased rise times.

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