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Vibrations analysis of bogie's axle from an electric locomotive class 43

IOP Conference Series: Materials Science and engineering 2020年第1期997卷

作者： M Alexandrov V Goanţă V Paleu D Apostol M Atanasiu CFR society Iasi branch Iasi Romania Mechanical Engineering Mechatronics and Robotics Department 'Gheorghe Asachi' Technical University of Iasi Iasi Romania

Reliability and maintenance play an important role in the field of rail vehicle systems. In order to be reliable, this type of transport needs continuous monitoring and regular maintenance. Regarding requested repair and maintenance interventions in relation to the probability of failure for each component, assembly or subassembly, additional information could be taken by data acquisition from sensors fitted to the locomotive bogies. The influence of the rail pattern configuration and the asymmetry of the positioning of both the traction motors and the gearbox on the amplitude and frequency of the introduced vibrations is considered. Fast and robust online signal processing algorithms are essential for designing a smart device. In this way, maintenance models can be created based on the state of the systems and integrated platforms can be produced in order to improve the diagnosis and expertise of a maintenance program. The paper presents the method of determining the vibrations induced by various causes at one of the axles of the electric locomotive class 43, of 3400 kW (4620 hp), focusing on rolling bearings fault frequencies. Further research will aim to detect the other possible sources of vibrations transmitted at the bogie's axle.

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Experimental study of the removable assemblies with screws from high pressure injection pumps

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IOP Conference Series: Materials Science and engineering 2022年第1期1235卷

作者： D P Bistriceanu C Bujoreanu S G Pal 'Gheorghe Asachi' Technical University of Iasi Department of Mechanical Engineering Mechatronics and Robotics Blvd. Mangeron No. 43 700050 Iasi Romania

High pressure injection pumps use removable assemblies with screws. They allow the subsequent assembly and disassembly, without destroying the components and the entire assembly, whenever is necessary. Our paper is an experimental analysis highlighting the influence of tightening parameters on components deformations. We perform the study using controller, Janome screwdriver, ZEISS measurement system and SEM (Scanning Electron Microscope) used in the metallographic analysis. Various torques applied on the screws give us results that show the interactions and their impact on the pumps components, producing deformation on the screws, gaskets and even front plate. A trial was done to establish the upper limit for the torque of the screws. After applying several tightening's at different values, we conclude that the optimal upper limit for screws tightening between front plate and housing is 45 Nm. Applying a torque bigger than 50 Nm, the screws are destroyed, shear. This can generate numerous defects on the sealing gasket area and on the front plate in the screws holes area. The circularity of the front plate is impacted by the thickness of the wall and the inner / outer diameters.

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Study of Cognitive Radio Techniques for Dynamic Spectrum Allocation

Study of Cognitive Radio Techniques for Dynamic Spectrum All...

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Smart Electronics and Communication (ICOSEC), International Conference on

作者： M. Poonguzhali M. Rekha A. Sumathi N. Duraichi K. Jeyalakshmi Sivakumar Sattanathan Department of Electronics and Communication Engineering Narasu's Sarathy Institute of Technology Salem Tamil Nadu India Department of Information Technology R. M. K. Engineering College Kavarpettai Tamil Nadu India Department of Information Technology KPR College of Arts Science and Research Avinashi Road Coimbatore Tamil Nadu India Department of Electronics and Communication Engineering Saveetha School of Engineering Chennai Tamil Nadu India Department of Physics PSNA College of Engineering and Technology (Autonomous) Dindigul Tamil Nadu India Department of Mechatronics Engineering Centre for Automation and Robotics (ANRO) Hindustan Institute of Technology and Science Chennai Tamil Nadu India

Cognitive Radio (CR) helps to allocate the available Radio Frequency (RF) spectrum of an essential (authorized) client and an auxiliary client. In the cognitive radio technology also known as Dynamic Spectrum Access (DSA), secondary clients may take advantage of the numerous spectrum gaps in allowed spectrum groups. This research study presents a review on signal processing techniques used for performing spectrum detection in CR networks, with the aim of enabling unlicensed auxiliary clients to adjust their transmission boundaries to the RF environment while considering the necessities of including authorized clients. This study distinguishes five fundamental groups of signal processing algorithms to perform spectrum sensing and present the dynamic spectrum sharing models for spectrum access. Furthermore, this study contrasts the advantages and disadvantages of each technique when applied to system administration frameworks, these solutions are evaluated by using metrics, such as the speed with which they may investigate spectrum consumption and its influence in system administration effectiveness. Signal processing and identification approaches for performing spectrum detection in cognitive radio networks are also investigated along with its current progressive phase, research flow issues, and future objectives.

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Correction to: Development of a dedicated 3D printed myocardial perfusion phantom: proof-of-concept in dynamic SPECT

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Medical & biological engineering & computing 2022年第6期60卷 1551-1553页

作者： Marije E Kamphuis Gijs J de Vries Henny Kuipers Marloes Saaltink Jacqueline Verschoor Marcel J W Greuter Riemer H J A Slart Cornelis H Slump Multi-Modality Medical Imaging (M3i) Group Faculty of Science and Technology Technical Medical Centre 2386 University of Twente P.O. Box 217 7500 AE Enschede The Netherlands. kamphuis@utwente.nl. Robotics and Mechatronics (RaM) Group Faculty of Electrical Engineering Mathematics and Computer Science Technical Medical Centre University of Twente Enschede The Netherlands. kamphuis@utwente.nl. Robotics and Mechatronics (RaM) Group Faculty of Electrical Engineering Mathematics and Computer Science Technical Medical Centre University of Twente Enschede The Netherlands. Department of Nuclear Medicine Ziekenhuis Groep Twente Hengelo The Netherlands. Medical Imaging Centre Department of Nuclear Medicine and Molecular Imaging University Medical Center Groningen University of Groningen Groningen The Netherlands. Biomedical Photonic Imaging Group Faculty of Science and Technology Technical Medical Centre University of Twente Enschede The Netherlands.

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Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology 2022年第4期60卷 589-590页

作者： F van den Noort C Manzini C H van der Vaart M A J van Limbeek C H Slump A T M Grob Robotics and Mechatronics Faculty of Electrical Engineering Mathematics and Computer Science Technical Medical Centre University of Twente Enschede The Netherlands. Department of Obstetrics and Gynecology University Medical Centre Utrecht Utrecht The Netherlands. Dynamics of Complex Fluids Max Planck Institute for Dynamics and Self-Organization Göttingen Germany. Multi-Modality Medical Imaging Faculty of Science and Technology Technical Medical Centre University of Twente Enschede The Netherlands.

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Paper-Based Microfluidic Chips for Wide Time Range Fluid Control Based on Knife Crafting and Laser Cutting

SSRN

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SSRN 2024年

作者： Zhong, Songyi Xue, Liqian Wang, Yue Liu, Na Li, Long Zhang, Quan Yue, Tao School of Mechatronics Engineering and Automation Shanghai University Shanghai200444 China School of Future Technology Shanghai University Shanghai200444 China Shanghai Key Laboratory of Intelligent Manufacturing and Robotics Shanghai University Shanghai200444 China Shanghai Institute of Intelligent Science and Technology Tongji University Shanghai200092 China Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province Hangzhou310058 China

In recent years, paper-based microfluidic chips have emerged as a promising microfluidic platform due to their simplicity, low cost, portability, and ease of fabrication. They have been applied in various fields such as biological analysis, environmental monitoring, and medical diagnostics. However, the current paper-based chips made of nitrocellulose membrane still can be improved in liquid flow rate control. To address these issues, a novel paper-based microfluidic chip is designed to control liquid in a wide time range, and the liquid delay and acceleration control are realized by laser cutting and knife crafting respectively. Microfluidic chip’s hydrophobic boundaries can be manufactured in a one-step process using laser cutting, taking less than 10 seconds. Additionally, the structural parameters of microgrooves, which have a significant impact on flow rate, can be precisely controlled using a scalpel-based cutting platform. This enables efficient and consistent microgroove processing. Furthermore, experimental optimization of laser cutting and knife crafting parameters is performed, along with an exploration of factors influencing the delay and acceleration effects in the chip structures. The effectiveness of these processing methods is validated through practical applications. In summary, this study realizes a wide time range fluid control in paper-based microfluidic chips, which can achieve delay and acceleration in the range of −57.8% to +828.3%, thus expanding the application range of paper-based microfluidic chips. © 2024, The Authors. All rights reserved.

关键词： Microfluidic chips

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A Wireless Communication Method with Dynamic Adding Nodes for the Underground Search and Rescue Robot

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Journal of Measurement Science and Instrumentation 2010年第3期000卷

作者： Guo-tai JIAO Feng WANG Dong-ze QIN State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin 150001 China College of Mechatronics Engineering North University of China Taiyuan030051 China State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin 150001 China Robotics Research Center North University of China Taiyuan 030051 China College of Mechatronics Engineering North University of China Taiyuan030051 China

A wireless communication method with dynamic adding nodes for Underground Search and Rescue robot is proposed: fix the address of the controller, add repeater nodes into the net dynamically, and shift the address of the mobile terminal. With this method, the Search and Rescue robot can reach the deeper place of a mine to help rescue and keep in touch with the controller through wireless communication in a single channel, even in a complex laneway where radio wave cannot go through the thick wall. The collision in the process of the two-way multi-hop communication in the single channel will also be resolved by the communication direction priority and response signal mechanism, to enhance the reliability of communication. Finally, a sample is designed and an experiment is conducted to verify the efficiency of the method.

关键词： multi-hop wireless communication underground search and rescue robot

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Development of parallel manipulator sit to stand assistive device for elderly people

Development of parallel manipulator sit to stand assistive d...

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IEEE Workshop on Advanced robotics and its Social Impacts, ARSO

作者： Omar Salah Ahmed Asker Ahmed M. R. Fath El-Bab Samy M. F. Assal Ahmed A. Ramadan Salvatore Sessa Ahmed Abo-Ismail Egypt-Japan University of Science and Technology Alexandria Egypt Egypt-Japan University of Science and Technology New Borg-El-Arab Alexandria Egypt El-Bab is with Egypt-Japan University of Science and Technology New Borg-El-Arab Alexandria Egypt Department of production engineering and mechanical design Egypt Tanta University Alexandria Egypt Mechatronics and Robotics dept. Egypt-Japan University of Science and Technology School of Creative Science and Engineering Waseda University Tokyo Japan

This paper describes a novel mobility assistive device under development in the Egypt-Japan University of Science and Technology (E-JUST). The proposed system can help patients who do not have enough physical strength on the lower limbs during sit to stand due to aging, diseases such as polymyositis and myopathy, and joint replacement surgery complications. It can follow the natural pattern of human motion during sit to stand providing assistance force under the shoulder. The overall device is compact and employees a parallel mechanism which provide more stiffness. Several experiments were carried out in a VICON room to calculate the human motion posture while sit to stand motion in addition estimate the trajectory of the end effector during assisting. Computer simulation was built to verify the performance of the proposed system with the reference trajectory.

关键词： Actuators Force Assistive devices Hip Educational institutions Joints End effectors

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Considerations on elliptical failure envelope associated to Mohr-Coulomb criterion

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IOP Conference Series: Materials Science and engineering 2016年第4期145卷

作者： A M Comanici P D Barsanescu 'Gheorghe Asachi' Technical University of Iasi-Romania Department of Mechanical Engineering Mechatronics and Robotics Blvd. Mangeron No. 63 700050 Iasi Romania

Mohr-Coulomb theory is mostly used in civil engineering as it is suitable for soils, rock, concretes, etc., meaning that the theory is generally used for brittle facture of the materials, but there are cases when it matches ductile behaviour also. The failure envelope described by the Mohr-Coulomb criterion is not completely accurate to the real yield envelope. The ductile or brittle behaviour of materials could not be incorporated in a linear envelope suggested by classic stress state theories and so, there have been a number of authors who have refined the notion of yield envelope so that it would fit better to the actual behaviour of materials. The need of a realistic yield envelope comes from the demand that the failure state should be able to be predicted in a fair manner and with as little errors as possible. Of course, certain criteria will be closer to the actual situation, but there is a constant need to unify and refine the limit stress theories in order to avoid problems as defining boundaries of application areas on numerical programs. Mohr-Coulomb's yield envelope is the most used one on programs, can be reduced to Tresca theory when the materials are conducting a ductile behaviour and has a linear simplified form. The paper presents some considerations with respect to the elliptical failure envelope correlated to the Mohr-Coulomb theory. The equations have been rewritten for triaxial situation to describe a more accurate state of stress that is encountered under real conditions in materials. Using the Mohr's circles to define the yield envelope, the calculus has been made in in order to determine the yield stress at tensile tests

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Assessing the Integration of Software Agents and Industrial Automation Systems with ISO/IEC 25010

Assessing the Integration of Software Agents and Industrial ...

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IEEE International Conference on Industrial Informatics (INDIN)

作者： Stamatis Karnouskos Roopak Sinha Paulo Leitão Luis Ribeiro Thomas. I. Strasser SAP Walldorf Germany IT & Software Engineering Auckland University of Technology New Zealand Research Centre in Digitalization and Intelligent Robotics (CeDRI) Instituto Politécnico de Bragança Campus de Santa Apolónia Bragança Portugal Linköping University Linköping Sweden Center for Energy – AIT Austrian Institute of Technology and Institute of Mechanics and Mechatronics – Vienna University of Technology Vienna Austria

Agent-technologies have been used for higher-level decision making in addition to carrying out lower-level automation and control functions in industrial systems. Recent research has identified a number of architectural patterns for the use of agents in industrial automation systems but these practices vary in several ways, including how closely agents are coupled with physical systems and their control functions. Such practices may play a pivotal role in the Cyber-Physical System integration and interaction. Hence, there is a clear need for a common set of criteria for assessing available practices and identifying a bestfit practice for a given industrial use case. Unfortunately, no such common criteria exist currently. This work proposes an assessment criteria approach as well as a methodology to enable the use case based selection of a best practice for integrating agents and industrial systems. The software product quality model proposed by the ISO/IEC 25010 family of standards is used as starting point and is put in the industrial automation context. Subsequently, the proposed methodology is applied, and a survey of experts in the domain is carried out, in order to reveal some insights on the key characteristics of the subject matter.

关键词： Automation IEC Standards ISO Standards Stakeholders Software Best practices

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