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2017 IEEE International Conference on Computing, Networking and Informatics, ICCNI 2017

作者： Chisom, Eze Victor Okafor, K.C. Obayi, A.A. Jennifer, Okoro Nkem Oparaku, O.U. Dept. of Electronic Engineering University of Nigeria Nsukka Nigeria Dept. of Mechatronics Engineering Federal University of Technology Owerri Nigeria Dept. of Computer Science University of Nigeria Nsukka Nigeria Dept. of Materials and Energy Technology Projects Development Institute Enugu Nigeria

ISBN: (纸本)9781509046423

In today's high performance computing (HPC) environments, analyzing and predicting the performance of multiple-processor systems (clusters cores) on critical workloads remains a challenge. This is as a result of the key metrics that influences system's behavior. Busty arrivals in HPCs demand either a shared memory-parallel architecture or pipelined dataflow architecture. At present, a processor model that is deterministic while offering better bandwidth interconnection, excellent task allocation with the granularity of the task decomposition (overhead) is perceived as the most efficient type. This paper carried out a K-bit processor performance analysis with Perl Benchmark software platform. This is used in the evaluation of processor performance metrics. The software tool is developed with C# programming language and used to synthesize processor performance equations. Various processor cores are evaluated including Processor-1 (Pentium4), Processor-2(Core2Duo), Processor-3 (Core i7-Intel with 4-Cores and 8-Threads) and Processor-4 (AMD Opteron X4 2356). Direct measurement-form with a simulated/measured-form analysis is evaluated while analyzing the experimental test cases. The results indicate that the core i7 K-bit processor system offers the best performance considering execution time of 0.51secs (i.e. lower overhead) with 50% performance throughput hits relative to other CPU types. A clock cycle per instruction (CPI) of 0.60 is also obtained for core i7 showing the best latency profile. This observation can be used to determine optimal processor types for any given bandwidth and task decomposition operation. © 2017 IEEE.

关键词： Parallel architectures

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Modified SEPIC DC-to-DC Converter 2/(1-k) Output Gain Configuration for Renewable Power Energy and High Voltage Applications

Modified SEPIC DC-to-DC Converter 2/(1-k) Output Gain Config...

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IEEE International Conference on Power Electronics and Motion Control

作者： Emre Ozsoy Sanjeevikumar Padmanaban Viliam Fedak Charles Muranda Mihet Cernet Research & Development Design Center Danfoss Drives A/S Dept. of Energy Technology Aalborg University Dept. of Electrical Engg. & Mechatronics Technical University of Kosice Dept. of Electrical and Electronics Engg. University of Johannesburg Dept. of Electrical Engg. Transilvania University of Brasov

ISBN: (纸本)9781538641996

This paper investigates the analysis of a converter which has higher voltage gain as compared to the conventional and modified single ended primary inductor converter (SEPIC) topologies. Proposed high gain SEPIC converter has a combination of two voltage lifting topologies;the switched inductor-capacitor type and the switched capacitor modification. A combination of these two modifications achieves a voltage gain of twenty times at a duty ratio of 90% by using 3 inductors, 5 capacitors and 4 diodes. Simulations conducted in Matlab/Simulink validate the analytical analysis along with the derivations of the theoretical analysis of the converter.

关键词： DC-DC converter Modified SEPIC converter Renewable applications

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Corrigendum to “High-precision measurement of Cooper-pair mass using rotating spherical-shell superconductor” [Mater. Lett. 262 (2020) 127176]

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Materials Letters 2020年 281卷

作者： Le Phuong Hoang Dai-Nam Le Duc An Pham Thi Kim Cuc Nguyen Thi My An Nguyen Xuan Cuong Ngo Thai Duong Hoang Thanh-Binh Nguyen Binh Xuan Cao School of Mechanical Engineering Hanoi University of Science and Technology Ha Noi 100000 Viet Nam Automic Molecular and Optical Physics Research Group Advanced Institute of Materials Science Ton Duc Thang University Ho Chi Minh City 700000 Viet Nam Faculty of Applied Sciences Ton Duc Thang University Ho Chi Minh City 700000 Viet Nam Department of Natural Sciences and Engineering National Foundation for Science and Technology Development Ha Noi 100000 Viet Nam Department of Electrical Engineering Quang Tri Branch Hue University Quang Tri 48000 Viet Nam Faculty of Mechatronics and Automation University of Engineering and Technology Hanoi 100000 Viet Nam Thai Nguyen University of Education Thai Nguyen Province Viet Nam Institute of Research and Development Duy Tan University Da Nang 555000 Viet Nam

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Hybrid integrator design for enhanced tracking in motion control

Hybrid integrator design for enhanced tracking in motion con...

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American Control Conference

作者： D. A. Deenen M. F. Heertjes W. P. M. H. Heemels H. Nijmeijer Eindhoven University of Technology Department of Mechanical Engineering Dynamics & Control group ASML Mechatronics Development Eindhoven University of Technology Department of Mechanical Engineering Control Systems Technology group

ISBN: (纸本)9781509045839

This paper discusses a novel hybrid integrator design that (a) gives improved low-frequency disturbance rejection properties under double-integrator control, but (b) avoids the unwanted occurrence of overshoot and settling effects otherwise resulting from adding an extra linear integrator. The main principle behind this new design is that the resulting hybrid element generates a continuous control output signal based on integrator action when possible, while overall satisfying a sector condition that restricts the input-output behavior to a [0,k_h]-sector, where k_h is a positive gain derived from a closed-loop stability argument. In fact, closed-loop stability can be guaranteed on the basis of a circle-criterion-like argument and checked through (measured) frequency response data, thereby avoiding the need for parametric models. The strengths of this new hybrid integrator will be demonstrated experimentally on a wafer stage system of an industrial wafer scanner.

关键词： integrators overshooting Disputes updated design INPUT-OUTPUT

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Recent developments and Research Progress on Friction Stir Welding of Titanium Alloys: An Overview

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IOP Conference Series: Materials Science and Engineering 2018年第1期330卷

作者： Sivaji Karna Muralimohan Cheepu D. Venkateswarulu V. Srikanth Defence Research and Development Laboratory Telangana 500058 India. Department of Mechatronics Engineering Kyungsung University Busan 48434 Republic of Korea. Department of Mechanical Engineering Marri Laxman Reddy Institute of Technology and Management Telangana 500043 India.

Titanium and its alloys are joined by various welding processes. However, Fusion welding of titanium alloys resulted solidification problems like porosity, segregation and columnar grains. The problems occurred in conventional welding processes can be resolved using a solid state welding i.e. friction stir welding. Aluminium and Magnesium alloys were welded by friction stir welding. However alloys used for high temperature applications such as titanium alloys and steels are arduous to weld using friction stir welding process because of tool limitations. Present paper summarises the studies on joining of Titanium alloys using friction stir welding with different tool materials. Selection of tool material and effect of welding conditions on mechanical and microstructure properties of weldments were also reported. Major advantage with friction stir welding is, we can control the welding temperature above or below β-transus temperature by optimizing the process parameters. Stir zone in below beta transus condition consists of bi-modal microstructure and microstructure in above β-transus condition has large prior β- grains and α/β laths present in the grain. Welding experiments conducted below β- transus condition has better mechanical properties than welding at above β-transus condition. Hardness and tensile properties of weldments are correlated with the stir zone microstructure.

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Multi-view modeling and automated analysis of product line variability in systems engineering 16

Multi-view modeling and automated analysis of product line v...

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20th International Systems and Software Product Line Conference, SPLC 2016

作者： Nešić, Damir Nyberg, Mattias Division of Mechatronics Department of Machine Design Royal Institute of Technology StockholmSE-100 44 Sweden Electrical Systems Development Scania CV AB SödertäljeSE-151 87 Sweden Division of Mechatronics at ITM Department KTH University Sweden

ISBN: (纸本)9781450340502

Product Lines (PL) in the systems engineering (SE) domain are one of the largest and most complex ones. The sheer number of different products that can be derived from PL points out to the scale of the challenge that Product Line Engineering (PLE) faces. Various development artifacts describe PL but due to their diversity, variability modeling across PL is a challenging task. Moreover, this complexity is a major obstacle for achieving traceability across PL which is especially important for product verification. In order to support systems engineering by establishing traceability across PL and aid verification planning we propose Multi-View Variability Model (MVVM). MVVM introduces a set of variability models that represent variability in various development artifacts, e.g. architecture, requirements etc. and corresponding inter-model constraints. We provide a formalization of MVVM and perform a transformation of the MVVM model to a Constraint Satisfiability Problem (CSP) where we formulate queries for the CSP model in order to extract information about variability dependencies among MVVM views. Throughout the paper we use a real system from the automotive domain as the working example in order to illustrate the introduced concepts. © 2016 ACM.

关键词： Constraint satisfaction problems

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Advanced Micromorphology Analysis of Cu/Fe NPs Thin Films

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IOP Conference Series: Materials Science and Engineering 2019年第1期611卷

作者： Ș Țălu A Ghaderi K Stępień F M Mwema The Directorate of Research Development and Innovation Management (DMCDI) The Technical University of Cluj-Napoca Constantin Daicoviciu Street no. 15 Cluj-Napoca 400020 Cluj county Romania Young Researchers and Elite Club West Tehran Branch Islamic Azad University Tehran Iran Faculty of Mechatronics and Mechanical Engineering Kielce University of Technology Al. 1000-lecia P. P. 7 25-314 Kielce Poland Department of Mechanical Engineering Science University of Johannesburg Auckland Park Campus South Africa

In this work, an advanced analysis of Cu/Fe NPs thin films using atomic force microscopy (AFM) has been discussed to characterize at nanoscale 3-D surface microtexture. Samples of Cu/Fe thin films were fabricated by Direct Current-Magnetron Sputtering technique with two controlled thicknesses (group I: Cu 55 nm/Fe 55 nm and group II: Cu 55 nm/Fe 70 nm) in specific conditions of pressure and power. The results obtained from experimental measurements suggested that the surface of group I has the lowest values for fractal dimension (D = 2.28 ± 0.01) and root mean square height (Sq = 4.40 ± 0.1 nm); while the highest values for fractal dimension (D = 2.31 ± 0.01) and root mean square height (Sq = 4.67 ± 0.1 nm) were found in group II. Stereometric and fractal analyses applied for thin films are modern tools for accurate quantitative morphometric characterisation.

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Research on the mechanical properties of titanium biocompatible alloys obtained by sintering

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UPB Scientific Bulletin, Series B: Chemistry and Materials Science 2016年第2期78卷 195-202页

作者： Rontescu, Corneliu Pacioga, Adrian Iacobescu, Gabriel Amza, Ctlin-Gheorhe Dept. of Materials Technology and Welding University POLITEHNICA of Bucharest Romania National Institute for Research and Development in Mechatronics and Measurement Technique Romania

This paper presents a study on the microstructural and mechanical characteristics of a biocompatible Ti-6Al-4V alloy used for orthopedic implants. The Ti-6Al-4V test pieces were obtained by the Direct Melting Laser Sintering (DMLS) process. The test pieces obtained by sintering were properly processed and subjected to the tensile test. Following the analysis of the obtained results it was concluded that the values of the mechanical properties of the sintered test samples are within the limits as prescribed by the producer of the titanium biocompatible alloy powder. The products obtained by DMLS offer excellent combination of tensile strength, ductility and coefficient of elasticity, which proves the high mechanical biocompatibility of the Ti-6Al-4V alloy and its suitability for biomedical applications involving static or dynamic loading conditions, as for example orthopedic implants.

关键词： Aluminum alloys

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IOP Conference Series: Materials Science and Engineering 2018年第1期330卷

作者： Muralimohan Cheepu B. Srinivas Nalluri Abhishek T. Ramachandraiah Sivaji Karna D. Venkateswarlu Suresh Alapati Woo Seong Che Department of Mechatronics Engineering Kyungsung University Busan 48434 Republic of Korea. Department of Mechanical Engineering MVGR College of Engineering Andhra Pradesh 535005 India. Senior Engineer Department of Research and Development D&H Secheron Electrodes Pvt. Limited Madhya Pradesh 452006 India. Defence Research and Development Laboratory Telangana 500058 India. Department of Mechanical Engineering Marri Laxman Reddy Institute of Technology and Management Telangana 500043 India.

The dissimilar joining using gas tungsten arc welding - brazing of 304 stainless steel to 5083 Al alloy had been conducted with the addition of Al-Cu eutectic filler metal. The interface microstructure formation between filler metal and substrates, and spreading of the filler metal were studied. The interface microstructure between filler metal and aluminum alloy characterized that the formation of pores and elongated grains with the initiation of micro cracks. The spreading of the liquid braze filler on stainless steel side packed the edges and appeared as convex shape, whereas a concave shape has been formed on aluminum side. The major compounds formed at the fusion zone interface were determined by using X-ray diffraction techniques and energy-dispersive X-ray spectroscopy analysis. The micro hardness at the weld interfaces found to be higher than the substrates owing to the presence of Fe2Al5 and CuAl2 intermetallic compounds. The maximum tensile strength of the weld joints was about 95 MPa, and the tensile fracture occurred at heat affected zone on weak material of the aluminum side and/or at stainless steel/weld seam interface along intermetallic layer. The interface formation and its effect on mechanical properties of the welds during gas tungsten arc welding-brazing has been discussed.

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Dynamic Hybrid Position Force Control using Virtual Internal Model to realize a cutting task by a snake-like robot

Dynamic Hybrid Position Force Control using Virtual Internal...

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IEEE/RAS-EMBS International Conference on Biomedical Robotics and Biomechatronics (BioRob)

作者： Shunsuke Nansai Mohan Rajesh Elara Masami Iwase Department of Robotics and Mechatronics Tokyo Denki University Tokyo Japan Engineering Product Development Pillar Singapore University of Technology and Design Singapore

ISBN: (纸本)9781509032884

A real snake has simple figure like a string, and has highly adaptability corresponding to the environments/tasks. A snake-like robot mimics such highly adaptability of the real snake, is expected as an adaptable robot corresponding to the environments/tasks. Many literatures have reported with respect to locomotion controls of the snake-like robot, but haven't reported studies for applications. However, enhancement of the applications is required in real scenes of which the snake-like robot is expected to work. This paper reports to design the force controller to realize the cutting task by the snake-like robot, as a leading example of the force control in the real scenes. Since the force control in the feed direction and the servo control in its normal direction are required in order to realize the cutting task, the Dynamic Hybrid Position/Force Control System is designed. The Virtual Internal Model based on the impedance model is utilized as the force control method. The Model Following Servo Control System utilizing the Virtual Internal Model based on the impedance model is designed, and the Dynamic Hybrid Position/Force Control System is realized. Effectiveness of the designed control system is verified through a numerical simulation.

关键词： Robots Mathematical model Force control Force Numerical models Trajectory

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