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Some improvements on the one-step inverse isogeometric analysis by proposing a multistep inverse isogeometric methodology in sheet metal stamping processes

arXiv

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arXiv 2020年

作者： Reza Isazadeh, Amir Shamloofard, Mansoor Assempour, Ahmad Center of Excellence in Design Robotics and Automation Department of Mechanical Engineering Sharif University of Technology Azadi Avenue P.O. Box 11365-9567 Tehran Iran

The isogeometric methodology has been successfully implemented in one-step inverse analysis of sheet metal stamping processes. However, these models are not capable of analyzing forming processes that require severe deformation and several forming stages. This paper presents a multistep inverse isogeometric methodology to enhance the precision of one-step models in predictions of the initial blank, strain distributions, and drawability of the formed parts. This methodology deals with the minimization of potential energy, deformation theory of plasticity, and considering membrane elements. The presented methodology utilizes the NURBS basis functions to create the final, middle, and blank geometries and also to analyze sheet metal deformation. The characteristics of the applied formulations make it possible to simultaneously observe the effects of changing part parameters on its formability. One advantage of this approach is that the linear system of governing equations is solved without concerning about the convergence. Besides, the presented methodology can successfully generate the middle geometry and to restrict the movements of physical nodes along the middle surface, by presenting a new NURBS-based mapping and sliding constraint technique. The performance of the presented model is experimentally and numerically evaluated under two classical problems, including the forming of a rectangular box and a two-step drawing of a circular cup. Results comparisons indicate the credibility of the presented model in prediction of forming parameters at a low computation time. Copyright © 2020, The Authors. All rights reserved.

关键词： Potential energy

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Magnetic Continuum Robot for Intelligent Manipulation in Medical Applications

SmartBot

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SmartBot 2025年

作者： Yuanbiao Ma Xuanyu An Qijun Yang Mingxue Cai Zhiqiang Tang Jinke Chang Veronica Iacovacci Tiantian Xu Li Zhang Qianqian Wang Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments School of Mechanical Engineering Southeast University Nanjing China Guangdong Provincial Key Laboratory of Robotics and Intelligent System Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen China Department of Mechanical Engineering National University of Singapore Queenstown Singapore Department of Engineering Science University of Oxford Oxford UK Department of Surgical Biotechnology Division of Surgery & Interventional Science Centre for Biomaterials in Surgical Reconstruction and Regeneration University College London London UK BioRobotics Institute Scuola Superiore Sant’Anna Pisa Italy Department of Excellence in Robotics & AI Scuola Superiore Sant’Anna Pisa Italy Department of Mechanical and Automation Engineering The Chinese University of Hong Kong Hong Kong China Chow Yuk Ho Technology Center for Innovative Medicine The Chinese University of Hong Kong Hong Kong China Multi-Scale Medical Robotics Center Hong Kong Science Park Hong Kong China

Magnetic continuum robots (MCRs) have garnered substantial attention as a new class of flexible robotic systems capable of navigating complex and confined spaces with remarkable dexterity. By combining continuous, deformable structures with remotely applied magnetic fields, MCRs achieve contactless, remote manipulation, making them well-suited for medical applications. This review introduces recent advances in MCR research, focusing on design principles, structural configurations, and control strategies. Various MCR designs and structures, including those integrated with permanent magnets, magnetic matter, ferromagnetic sphere, and micro coil, are discussed. Furthermore, different magnetic actuation platforms are introduced, and the level of MCR automation is classified based on control strategies. Key intelligent manipulation capabilities of MCRs, including navigation, delivery, printing, grasping, imaging, and sensing are explored. Finally, future development priorities and directions are identified to provide insights for advancing intelligent robotic systems.

关键词： intelligent manipulation magnetic actuation magnetic continuum robot medical application

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Behavior of Different PLA Sandwich Structures Loaded in Three Points Bending

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Macromolecular Symposia 2021年第1期396卷 2000306-2000306页

作者： Jiga, Gabriel Gh. Burtoiu, Mircea G. Pascu, Nicoleta E. Dobrescu, Tiberiu G. Strength of Materials Department University POLITEHNICA of Bucharest Splaiul Independenţei 313 Bucharest060042 Romania YOKOGAWA Europe B.V. Company Str. Fabrica de glucoză 5 Bucharest020331 Romania Department of Engineering Graphics and Industrial Design University POLITEHNICA of Bucharest Splaiul Independenţei 313 Bucharest060042 Romania Department of Robotics and Production Systems University POLITEHNICA of Bucharest Splaiul Independenţei 313 Bucharest060042 Romania

Sandwich structures can be classed as composite materials in that they consist of two or more individual components of differing properties which when combined result in a high-performance material. In contrast to monolithic composites—which consist of an intimate mixture of fibers (glass, Kevlar, carbon etc.) supported within a continuous matrix (e.g., thermoplastic or thermoset resin)—sandwich structures show a discrete structure in which a core material is bonded to, and faced with, a skin material. The skin material usually shows a high stiffness, whereas the core typically has high compressive and shear strength. The primary advantage of a sandwich composite is very high stiffness-to-weight and high bending strength-to-weight ratio. The sandwich enhances the flexural rigidity of the structure without adding substantial weight. First of all, the core should possess low density in order to add as little as possible to the total weight of the sandwich construction. In this paper, three different core configurations are been studied: honeycomb, inversed honeycomb and Kagome bonded to aluminum skins. The cores are made from PLA using the FDM (fusion deposition method) procedure, on a 3D printer. © 2021 Wiley-VCH GmbH

关键词： 3D printers

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Corrigendum to 'Foot trajectories and loading rates in a transfemoral amputee for six different commercial prosthetic knees: An indication of adaptability'[Medical engineering and Physics, Volume 68, June 2019, Pages 46-56]

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Medical engineering & physics 2024年 124卷 104030页

作者： Alireza Abouhossein Mohammed I Awad Hafiz F Maqbool Carl Crisp Todd D Stewart Neil Messenger Robert C Richardson Abbas A Dehghani-Sanij David Bradley Department of Ergonomics School of Public Health and Safety Shahid Beheshti University of Medical Sciences *** Tehran Iran Robotics Design and Optimisation Mechanical Engineering University of Leeds School of Mechanical Engineering Leeds LS2 9JT United Kingdom. Electronic address: a.abouhossein@leeds.ac.uk. Faculty of Engineering Ain Shams University Cairo Egypt. Department of Mechatronics & Control Engineering University of Engineering & Technology Lahore Faisalabad Pakistan. Robotics Design and Optimisation Mechanical Engineering University of Leeds School of Mechanical Engineering Leeds LS2 9JT United Kingdom. Institute Medical and Biological Engineering School of Mechanical Engineering University of Leeds Leeds LS2 9JT UK. School of Sport and Exercise Sciences University of Leeds Leeds LS2 9JT UK. Abertay University Bell Street Dundee DD1 1HG UK.

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Publisher Correction to: design and Simulation of a Crash Energy Absorption System Integrated with Magneto-Rheological Absorber

引用

Journal of Vibration engineering & Technologies 2021年第7期9卷 1807-1807页

作者： Archakam, Pavan Kumar Muthuswamy, Sreekumar Centre for AI IoT and Robotics Department of Mechanical Engineering Indian Institute of Information Technology Design and Manufacturing Kancheepuram India

A correction to this paper has been published: https://***/10.1007/s42417-021-00339-1

关键词：

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Separator equipment performance of iron ore and coal using experimental and ANN-based analysis

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Scientific reports 2025年第1期15卷 18197页

作者： Bharath Kumar Shanmugam Harish Hanumanthappa Raushan Kumar Singh C Durga Prasad Manish Kumar Amit Kumar S P Samal Adham E Ragab S M Mozammil Hasnain Department of Artificial Intelligence and Robotics Engineering Dayananda Sagar University Harohalli Kanakapura Road Ramanagara Dt Bengaluru 562112 India. School of Computer Science and Engineering RV University Bengaluru Karnataka 560059 India. Department of Computer Engineering & Applications GLA University Mathura U.P 281406 India. Department of Mechanical Engineering RV Institute of Technology and Management Bengaluru Karnataka 560076 India. Centre for Augmented Intelligence and Design Department of Mechanical Engineering Sri Eshwar College of Engineering Coimbatore Tamil Nadu 641202 India. amit7214@***. Department of Biosciences Saveetha School of Engineering Saveetha Institute of Medical and Technical Sciences Chennai 602105 India. Department of Industrial Engineering College of Engineering King Saud University P.O. Box 800 11421 Riyadh Saudi Arabia. Department of Mechanical Engineering Faculty of Engineering & Technology Marwadi University Research Center Marwadi University Rajkot Gujarat 360003 India. Smmh.429@***.

The present study deals with the development of a new separator for the separation of iron ore and coal of a size fraction of -4 + 0 mm individually. Particles of iron ore with size fraction - 2 + 0 mm and finer coal were separated separately using screen mesh with an aperture size of 2 mm. The operating characteristics of the screen's upward slope and the screen's vibration frequency of the new separation equipment can be easily modified. In this study, moist iron ore and coal segregation have been carried out for various separation angles and frequencies, and test results of moist iron ore and coal were compared based on their moisture content and density. Also, for the prediction of results, artificial neural network (ANN) modeling and regression analysis were implemented. The R-square value for regression analysis of experimental results was found higher than 85.60% and 88.50% for coal and iron ore respectively. The R-square value for the ANN mathematical model of experimental results was found higher than 99.10% and 98.24% for coal and iron ore respectively. The comparison of the regression model, the ANN model's mathematical modeling results, and the test results for the separation of moist iron ore and coal hold a strong correlation. For validation, residual analysis was also performed on the separation of moist iron ore and coal regression and ANN models. Including improved accuracy, reduced computational time, and enhanced predictive capabilities. The residual probability plot's results for homoscedasticity, low standard deviation, normality, and independence demonstrate that, under all experimental settings for iron ore and coal, the developed artificial neural network (ANN) model outperforms the regression model in terms of prediction accuracy.

关键词： Artificial neural network Coal Iron ore Prediction Regression Residual analysis Separator equipment

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Localization of near-field sources based on linear prediction and oblique projection operator

Localization of near-field sources based on linear predictio...

引用

作者： Zuo, Weiliang Xin, Jingmin Liu, Wenyi Zheng, Nanning Ohmori, Hiromitsu Sano, Akira Institute of Artificial Intelligence and Robotics National Engineering Laboratory for Visual Information Processing and Applications School of Artificial Intelligence Xi'An Jiaotong University Xi'an710049 China Department of System Design Engineering Keio University Yokohama223-8522 Japan

This paper investigates the localization of multiple near-field narrowband sources with a symmetric uniform linear array, and a new linear prediction approach based on the truncated singular value decomposition (LPATS) is proposed by taking an advantage of the anti-diagonal elements of the noiseless array covariance matrix. However, when the number of array snapshots is not sufficiently large enough, the 'saturation behavior' is usually encountered in most of the existing localization methods for the near-field sources, where the estimation errors of the estimated directions-of-arrival (DOAs) and ranges cannot decrease with the signal-to-noise ratio. In this paper, an oblique projection based alternating iterative scheme is presented to improve the accuracy of the estimated location parameters. Furthermore, the statistical analysis of the proposed LPATS is studied, and the asymptotic mean-square-error expressions of the estimation errors are derived for the DOAs and ranges. The effectiveness and the theoretical analysis of the proposed LPATS are verified through numerical examples, and the simulation results show that the LPATS provides good estimation performance for both the DOAs and ranges compared to some existing methods. © 1991-2012 IEEE.

关键词： Mean square error

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VibroSleeve: A wearable vibro-tactile feedback device for arm guidance

VibroSleeve: A wearable vibro-tactile feedback device for ar...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： Deepa Prabhu Muhammad Mehedi Hasan Lisa Wise Clare MacMahon Chris McCarthy Faculty of Science Engineering and Technology School of Software Engineering Robotics and Mechatronics Lab Faculty of Health Arts and Design School of Health Sciences Swinburne University of Technology Hawthorn VIC Australia Department of Rehabilitation La Trobe University Melbourne VIC Australia

ISBN: (数字)9781728119908

ISBN: (纸本)9781728119915

Vibro-tactile feedback offers a complementary augmentation cue for motor guidance and training. Motivated by the needs of prosthetic vision rehabilitation, we explore the use of the cylindrical forearm surface to deliver arm guidance cues via vibro-tactile stimulation. We present `VibroSleeve', a novel wearable arm motion guidance aid made up of 4×4 arrangement of vibration coin motors embedded within an elastic sleeve for delivering vibro-tactile patterns to the forearm. In this paper, we present the concept and design of VibroSleeve, along with results of preliminary evaluation. We outline key insights gained into the perceptual aspects of calibration and usable intensity bandwidth critical for reliable interpretation of encoded information. Our results demonstrate feasibility of the approach, and provide foundations for future work on developing the sleeve as a rehabilitation aid for guiding the arm towards visually perceived targets.

关键词： Vibrations Training Pulse width modulation Pattern recognition Prosthetics Visualization Calibration

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Miniature magnetic robots for in-pipe locomotion 21

Miniature magnetic robots for in-pipe locomotion

引用

robotics Transforming the Future - 21st International Conference on Climbing and Walking Robots and the Support Technologies for Mobile Machines, CLAWAR 2018

作者： Mills, George H. Liu, Jason H.W. Kaddouh, Bilal Y. Jackson, Andrew E. Richardson, Robert C. Department of Mechanical Engineering University of Leeds LeedsLS2 9JT United Kingdom Institute of Design Robotics and Optimisation LeedsLS2 9JT United Kingdom

ISBN: (纸本)9781916449008

Inspection of both small and large diameter bore pipelines for pipe integrity and defect identification with a single system has previously been impractical;especially using wall-press locomotion methods with low adaptive range. A miniature magnetic wall-climbing robot has been developed as a robotic solution for the inspection of 50mm bore diameter pipelines which can scale in-pipe geometry obstacles to access larger connected pipelines. Using magnetic arrays directed through steel flux plates within the wheels, the robot uses magnetic forces to adhere to the pipe. The system is 3D printed and includes soft printed material rubber wheels. The robot prototype is wirelessly driven, controlled remotely through serial Bluetooth communication radio at 2.4 GHz rated up to 100m. The robot's unique compact geometry and magnetic design allows it to scale concave right-angle wall cases in just a 50mm diameter bore. By entering pipe networks through these small existing access points the robot removes the need for expensive drilling procedures required to fit launch vessels. © CLAWAR Association.

关键词： Pipelines

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Three-dimensional kinematic metamaterial with tuneable directional permeability

arXiv

引用

arXiv 2021年

作者： Yang, Yunfang Maiolino, Perla Chen, Yan You, Zhong Department of Engineering Science University of Oxford Parks Road OxfordOX1 3PJ United Kingdom Oxford Robotics Institute University of Oxford Parks Road OxfordOX1 3PJ United Kingdom Key Laboratory of Mechanism Theory Equipment Design of Ministry of Education Tianjin University Tianjin300072 China School of Mechanical Engineering Tianjin University Tianjin University Tianjin300072 China

Reconfigurable metamaterials are constructed from tessellation of deformable modules that give rise to a set of tuneable properties. To date, most research focuses on metamaterials that morph between final configurations along a single deformation path. Multi-pathway metamaterials that can transform into several different shapes according to various external stimuli are rare. Here we propose a kinematic based metamaterial with multiple predefined deformation paths. The inherent kinematic bifurcations of the deformable unit cells enable the metamaterial to switch among different paths under simple stimuli at one particular configuration, resulting in the enhancement of reconfigurability. The metamaterials demonstrated in this paper can provide multiple open channels in different orthogonal directions, making them suitable for multifunctional applications such as tuneable filters and reconfigurable wave guiding materials. © 2021, CC BY.

关键词： Metamaterials

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