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Accelerated Elliptical PDE Solver for Computational Fluid Dynamics Based on Configurable U-Net Architecture: Analogy to V-Cycle Multigrid

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Machine Intelligence Research 2025年第2期22卷 324-336页

作者： Kiran Bhaganagar David Chambers Laboratory of Turbulence Sensing and Intelligence SystemsDepartment of Mechanical EngineeringUniversity of TexasSan Antonio 78249USA Intelligence Systems Division Southwest Research InstituteSan Antonio 78238USA

A configurable U-Net architecture is trained to solve the multi-scale elliptical partial differential *** motivation is to improve the computational cost of the numerical solution of Navier-Stokes equations–the governing equations for fluid *** on the underlying concept of V-Cycle multigrid methods,a neural network framework using U-Net architecture is optimized to solve the Poisson equation and Helmholtz equations–the characteristic form of the discretized Navier-Stokes *** results demonstrate the optimized U-Net captures the high dimensional mathematical features of the elliptical operator and with a better convergence than the multigrid *** optimal performance between the errors and the FLOPS is the(3,2,5)case with 3 stacks of UNets,with 2 initial features,5 depth layers and with ELU ***,by training the network with the multi-scale synthetic data the finer features of the physical system are captured.

关键词： Configurable U-Net architecture neural network methods for elliptical equations multi-scale partial differential equations Poisson and Helmholtz equation solvers computational fluid dynamics solutions.

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Review on Lithium-ion Battery PHM from the Perspective of Key PHM Steps

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Chinese Journal of mechanical engineering 2024年第4期37卷 1-22页

作者： Jinzhen Kong Jie Liu Jingzhe Zhu Xi Zhang Kwok-Leung Tsui Zhike Peng Dong Wang School of Mechanical Engineering Hebei University of TechnologyTianjin 300401China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China Grado Department of Industrial and Systems Engineering Virginia Polytechnic Institute and State UniversityBlacksburg 24061USA School of Mechanical Engineering Ningxia UniversityNingxia 750021China

Prognostics and health management(PHM)has gotten considerable attention in the background of Industry *** PHM contributes to the reliable and safe operation of electric ***,relevant reviews are still continuously updated over *** this paper,we browsed extensive literature related to battery PHM from 2018to 2023 and summarized advances in battery PHM field,including battery testing and public datasets,fault diagnosis and prediction methods,health status estimation and health management *** last topic includes state of health estimation methods,remaining useful life prediction methods and predictive maintenance *** of these categories is introduced and discussed in *** on this survey,we accordingly discuss challenges left to battery PHM,and provide future research *** research systematically reviews recent research about battery PHM from the perspective of key PHM steps and provide some valuable prospects for researchers and practitioners.

关键词： Lithium-ion batteries Prognostics and health management Remaining useful life State of health Predictive maintenance

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Tailoring the in-plane and out-of-plane stiffness of soft fingers by endoskeleton topology optimization for stable grasping

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Science China(Technological Sciences) 2023年第11期66卷 3080-3089页

作者： LI DeChen CHEN ShiTong SONG ZeNan LIANG JiaLong ZHU XiangYang CHEN FeiFei State Key Laboratory of Mechanical System and Vibration School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China Meta Robotics Institute Shanghai Jiao Tong UniversityShanghai 200240China

The intrinsic compliance of soft materials endows soft robots with great advantages to achieve large deformation and adaptive interactions in grasping ***,current soft grippers usually focus on the in-plane large deformation and load capacity but ignore the effect of out-of-plane external loads,which may lead to instability in practical *** problem calls for stiffness design along multiple directions to withstand not only in-plane interacting forces with objects,but also unexpected outof-plane *** this paper,we design a new type of soft finger by embedding an endoskeleton inside the widely-used PneuNets actuator,and the endoskeleton layout is optimized to achieve a remarkable bending deflection and limited lateral deflection under combined external in-plane and out-of-plane *** on the multi-objective topology optimization approach,the key structural features of the optimized endoskeleton are extracted and *** multi-material soft fingers are fabricated by the silicone compound mold *** and dynamic experiment results validate that the soft gripper with endoskeleton embedded exhibits remarkably improved out-of-plane stiffness,without sacrificing the in-plane bending flexibility,and leads to more stable grasping.

关键词： soft robot soft gripper stable grasping topology optimization pneumatic actuator

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Multi-blade rubbing characteristics of the shaft-disk-blade-casing system with large rotation

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Applied Mathematics and Mechanics(English Edition) 2024年第1期45卷 111-136页

作者： Zhiyuan WU Linchuan ZHAO Han YAN Ge YAN Ao CHEN Wenming ZHANG State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong UniversityShanghai 200240China Shanghai Institute of Aerospace Systems Engineering Shanghai 201108China

Blade rubbing faults cause detrimental impact on the operation of aeroengines. Most of the existing studies on blade rubbing in the shaft-disk-blade-casing(SDBC) system have overlooked the elastic deformation of the blade, while some only consider the whirl of the rotor, neglecting its spin. To address these limitations, this paper proposes a dynamic model with large rotation for the SDBC system. The model incorporates the spin and whirl of the rotor, enabling the realistic reproduction of multiblade rubbing faults. To verify the accuracy of the SDBC model with large rotation and demonstrate its capability to effectively consider the rotational effects such as the centrifugal stiffening and gyroscopic effects, the natural characteristics and dynamic responses of the proposed model are compared with those obtained from reported research and experimental results. Furthermore, the effects of the rotating speed, contact stiffness,and blade number on the dynamic characteristics of the SDBC system with multi-blade rubbing are investigated. The results indicate that the phase angle between the rotor deflection and the unbalance excitation force increases with the increasing rotating speed,which significantly influences the rubbing penetration of each blade. The natural frequency of the SDBC system with rubbing constrain can be observed in the acceleration response of the casing and the torsional response of the shaft, and the frequency is related to the contact stiffness. Moreover, the vibration amplitude increases significantly with the product of the blade number under rubbing, and the rotating frequency approaches the natural frequency of the SDBC system. The proposed model can provide valuable insight for the fault diagnosis of rubbing in bladed rotating machinery.

关键词： shaft-disk-blade-casing(SDBC) large rotation spin and whirl multi-blade rubbing rotational effect

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The Autonomous Pipeline Navigation of a Cockroach Bio-Robot with Enhanced Walking Stimuli

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Cyborg and Bionic systems 2023年第1期4卷 47-55页

作者： Songsong Ma Yuansheng Chen Songlin Yang Shen Liu Lingqi Tang Bing Li Yao Li State Key Laboratory of Robotics and System Harbin Institute of TechnologyHarbinChina Guangdong Key Laboratory of Intelligent Morphing Mechanisms and Adaptive Robotics Harbin Institute of TechnologyShenzhenChina School of Mechanical Engineering and Automation Harbin Institute of TechnologyShenzhenChina The Biorobotics Institute Scuola Superiore Sant'AnnaPisaItaly

Tens of crawling bio-robots with cockroaches as the mobile platform have been developed with various *** with artificial crawling robots of the same size,they revealed better flexibility,larger payload,and stronger *** features made bio-robots ideal for pipeline inspection scenarios because the advancements in locomotion mechanisms and efficient power systems are still hurdles for current artificial *** this study,we controlled the bio-robot to crawl in the confined dark pipeline and achieved autonomous motion control with the help of an onboard sensing ***,a micro-camera was mounted on the electronic backpack of the cockroach for image collection,and an IMU sensor was used to compute its body *** electronic backpack transmitted images to the host computer for junction recognition and distance ***,the insect's habituation to electrical stimulation has long been an uncertain factor in the control of ***,a synergistic stimulation strategy was proposed to markedly reduce the habituation and increase the number of effective turning controls to over 100 *** is also found that both the increase of payload and the application of stimulations could promote the metabolic rate by monitoring carbon dioxide *** the integration of synergistic stimulation and autonomous control,we demonstrated the fully autonomous pipeline navigation with our cockroach bio-robot,which realized the cycle number of approximately 10 in a *** research provides a novel technology that has the potential for practical applications in the future.

关键词： robot artificial Robot

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Evaluation of optimal responses in Monel 400 alloy using computer based unconventional machining process

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Interactions 2025年第1期246卷 1-11页

作者： Manohar, Gunaselvi Chandrasekar, G. Radhakrishnan, G. Raj, P. Anantha Christu Ram, S. Department of Electronics and Instrumentation Engineering Easwari Engineering College Chennai India Department Mechanical Engineering PSNA College of Engineering and Technology Dindigul India Department of Electrical and Electronics Engineering Sri Krishna College of Engineering and Technology Tamilnadu Coimbatore India Division of Robotics Engineering Karunya Institute of Technology and Sciences Tamilnadu Coimbatore India Department of Mechanical Engineering Gokaraju Rangaraju Institute of Engineering and Technology Hyderabad India

The unconventional machining is an essential role in metal forming process. The dimensional accuracy and super finish are the main features of modern machining methods. Electric discharge machining is a competent process to any materials and composites. In this article is used to machining characteristics of Monel 400 alloy with monitored by computer networks. The response variables are mainly depending on input variables and their levels. Taguchi method is utilized to evaluate the optimal control factors. The mean and SN ratio is evaluated by based on the criteria of the responses. The involvement of control variables to the responses have been validated by variance analysis. The best possible MR was attained at a discharge current of 40 A, pulse on time of 140µs, and spark voltage of 25 *** finest RTW and SR was occurred at a discharge current of 40 A, pulse on time of 140µs, and spark voltage of 20 V. The scope of the work is to maximize the metal removal and minimize the tool wear. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2025.

关键词： Metal forming

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PCE: Multi-Agent Path Finding via Priority-Aware Communication & Experience Learning

IEEE Transactions on Intelligent Vehicles

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IEEE Transactions on Intelligent Vehicles 2024年 1-13页

作者： Gao, Jianqi Li, Yanjie Ye, Zhaohui Wu, Xinyu Department of Guangdong Key Laboratory of Intelligent Morphing Mechanisms and Adaptive Robotics and School of Mechanical Engineering and Automation Harbin Institute of Technology Shenzhen China Guangdong Provincial Key Laboratory of Robotics and Intelligent System Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen China

Multi-agent path finding (MAPF) is an essential issue for warehouse automation, where multiple agents plan collision-free paths from the start to goal positions. Reinforcement learning (RL) has been employed to develop partially observable distributed MAPF methods that can be scaled to any number of agents. However, existing RL-based MAPF methods still have some limitations in handling redundant information and avoiding deadlock, resulting in a low success rate or longer makespan. This paper proposes a Priority-aware Communication & Experience learning method (PCE), which combines RL with a novel priority-aware multi-agent communication and a new priority-aware deadlock experience replay to tackle this challenge. To be specific, our innovation encompasses two-fold. Our proposed communication mechanism aims to handle redundant information, which establishes a dynamic communication topology based on agents' priorities and proposes a two-head priority-aware graph attention network to aggregate information. In order to help the agent avoid deadlock, we prioritize the expert experience that solves the deadlock when performing experience replay. We conduct multiple simulation experiments on warehouse-like structured grid maps. Compared with the state-of-the-art RL-based MAPF methods, PCE performs significantly better with a higher success rate and lower makespan in small and large MAPF and higher average throughput in the lifelong MAPF, which can further improve the efficiency of warehouse automation. Finally, we validate PCE using three Turtlebot3-Burger robots, which shows that PCE can be applied in real warehouse automation scenarios. IEEE

关键词： Aggregates

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Study on Structural Behavior of HVOF-Sprayed NiCr/Mo Coating

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Journal of The Institution of Engineers (India): Series D 2024年第3期105卷 1961-1970页

作者： Venkate Gowda, C. Nagaraja, T.K. Yogesha, K.B. Chand, R. Prem Manjunatha, M.C. Sollapur, Shrishali Manjunath, C.J. Pushpa, N. Department of Mechanical Engineering Atria Institute of Technology Karnataka Bengaluru560024 India Department of Mechanical Engineering JSS Academy of Technical Education Karnataka Bengaluru560060 India Department of Robotics and Artificial Intelligence Bangalore Institute of Technology Karnataka Bengaluru India Department of Mechanical Engineering Bangalore Institute of Technology Karnataka Bengaluru India Karnataka Bengaluru560069 India Department of Mathematics Reva University Karnataka Bengaluru India

This study investigates the structural behavior of HVOF-sprayed NiCr/Mo coating. The main objective of the coating is to improve the surface properties such as micro-cutting, cavity, and cracks, to avoid the corrosion, and to determine self-life and wear resistance at room temperature and high temperature also. The coating structures are very sensitive to processing and working conditions, to overcome all these aspects, the surface metal has to undergo microstructure analysis, porosity, microstructure hardness, and X-ray diffraction (XRD), and to improve mechanical properties of metal. HVOF spraying technique was used to deposit the coating on mild steel plate than the coated sample characterized using scanning electron microscope (SEM), X-ray diffraction (XRD), microhardness, microindentation, and wear test. Moreover, we introduce the NiCr/Mo at different percentage levels (5%, 10%, and 15%) to evaluate the mechanical properties, to improve the performance and life span of the fracturing operations in aggressive conditions, which is essential in components replacement and economic savings in various industries such as aerospace, automotive, marine, etc. © The Institution of Engineers (India) 2024.

关键词： Chromium alloys

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Global cavitation and hydrodynamic characteristics of a composite propeller in non-uniform wake

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Journal of Hydrodynamics 2023年第3期35卷 498-515页

作者： Dan-dan Zhang Lu-lu Dong Qin Wu Jing Zhang Guo-yu Wang School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081China China Academy of Launch Vehicle Technology Systems Engineering Division Beijing 100076China

The composite propeller has attracted much interest due to its excellent mechanical properties such as high specific stiffness and high specific strength,hence there is an increasing interest in utilizing the composite materials to improve the hydrodynamic and structural performance of marine *** objective of this paper is to study the cavitation performance of composite propellers based on the unsteady simulation method considering the cavitation-composite structure *** typical cavitation patterns around the composite propeller are studied,which include blade sheet cavitation and tip vortex *** unsteady flow characteristics of tip vortex cavitation and structural dynamic response of composite propeller are studied,and the mechanism of composite propeller for the cavitation suppression and efficiency improvement is *** results show that compared with rigid propellers,composite propellers have smaller cavity volume and higher propulsion efficiency under the same *** unsteady cavitating flow characteristics under non-uniform wake are periodic,and the phase lag of hydrodynamic coefficients of composite propeller can be observed compared with that of the rigid *** bending-torsional coupling deformation of the composite propeller makes the pressure pulsation of the flow field gentler,which reduces the influence of the cavitation load on the composite propeller.

关键词： Composite propeller unsteady cavitation hydrodynamic characteristics fluid-structure interaction(FSI)

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A Computer Vision-Based System for Metal Sheet Pick Counting

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Computers, Materials & Continua 2023年第5期75卷 3643-3656页

作者： Jirasak Ji Warut Pannakkong Jirachai Buddhakulsomsiri School of Manufacturing Systems and Mechanical Engineering Sirindhorn International Institute of TechnologyThammasat University12120Pathum ThaniThailand

Inventory counting is crucial to manufacturing industries in terms of inventory management,production,and procurement *** companies currently require workers to manually count and track the status of materials,which are repetitive and non-value-added activities but incur significant costs to the companies as well as mental fatigue to the *** research aims to develop a computer vision system that can automate the material counting activity without applying any marker on the *** type of material of interest is metal sheet,whose shape is simple,a large rectangular shape,yet difficult to *** use of computer vision technology can reduce the costs incurred fromthe loss of high-value materials,eliminate repetitive work requirements for skilled labor,and reduce human error.A computer vision system is proposed and tested on a metal sheet picking process formultiple metal sheet stacks in the storage area by using one video *** results show that the proposed computer vision system can count the metal sheet picks under a real situation with a precision of 97.83%and a recall of 100%.

关键词： Computer vision manual operation operation monitoring material counting

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