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2023 Offshore Technology Conference Brasil, OTCB 2023

作者： Freitas, V.R. Cuéllar Sánchez, William Humberto Lima, G.S. Pastrana, M.A. Barroso, E.P. Muñoz, Daniel M. de Almeida, R.V. Fortaleza, E.L.F. Department of Mechanical Engineering University of Brasília DF Brasilia Brazil Faculty of Gama Electronics Engineering Undergraduate Program University of Brasília DF Brasília Brazil Repsol Sinopec Brasil Pesquisa e Desenvolvimento RJ Rio de Janeiro Brazil

ISBN: (纸本)9781959025023

Water Alternating Gas (WAG) is a consolidated enhanced oil recovery method that outperforms secondary recovery methods such as waterflooding or gas injection. Optimization of the WAG parameters can increase the cost function and improve revenues, but the algorithms usually implemented require high computational resources and time. In this context, a bio-inspired algorithm, Particle Swarm Optimization (PSO) is used to determine the best candidate for only two parameters, water and gas injection time, resulting in the determination of the WAG cycle and WAG ratio, thus drastically reducing the complexity of the problem. The proposed long-term optimization algorithm was applied in a modified version of a well-known reservoir benchmark Egg model, in which the fluid composition was adapted to resemble Brazilian pre-salt reservoir fluids and WAG injection. Moreover, it is shown that the best results obtained consider longer periods of water injection and improve the NPV by 5.5%. © Copyright 2023, Offshore Technology Conference.

关键词： Offshore oil well production

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Strain-tuning of domain walls in multilayer graphene probed in the quantum Hall regime

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Physical Review B 2022年第8期105卷 L081408-L081408页

作者： Paul Anderson Yifan Huang Yuanjun Fan Sara Qubbaj Sinisa Coh Qin Zhou Claudia Ojeda-Aristizabal Department of Physics and Astronomy California State University Long Beach Long Beach California 90840 USA Department of Mechanical and Materials Engineering University of Nebraska Lincoln Nebraska 68588-0526 USA Department of Mechanical Engineering and Materials Science and Engineering Program University of California Riverside Riverside California 92521 USA

Domain walls, topological defects that define the frontier between regions of different stacking order in multilayer graphene, have proved to host exciting physics. The ability to tune these topological defects in situ in an electronic transport experiment brings a wealth of possibilities in terms of fundamental understanding of domain walls as well as for electronic applications. Here, we demonstrate, through a MEMS (microelectromechanical system) actuator and magnetoresistance measurements, the effect of domain walls in multilayer graphene quantum Hall effect. Reversible and controlled uniaxial strain triggers the topological defects, manifested as addtional quantum Hall effect plateaus as well as a discrete and reversible modulation of the current across the device. Our findings are supported by theoretical calculations and constitute indication of the in situ tuning of topological defects in multilayer graphene probed through electronic transport, opening the way for the use of reversible topological defects in electronic applications.

关键词： Domain walls Transport phenomena Graphene Resistivity measurements Tight-binding model

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Design, analysis, and experimental investigations of a 2-DOF monolithic parallel mechanism

Design, analysis, and experimental investigations of a 2-DOF...

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IEEE/ASME (AIM) International Conference on Advanced Intelligent Mechatronics

作者： Yanding Qin Bijan Shirinzadeh Yanling Tian Dawei Zhang Umesh Bhagat Institute of Robotics and Automatic Information System Nankai University Tianjin China Robotics and Mechatronics Research Laboratory Department of Mechanical and Aerospace Engineering Monash University Clayton VIC Australia School of Mechanical Engineering Tianjin University Tianjin China

ISBN: (纸本)9781467353199

This paper presents the design and analysis of a 2-DOF monolithic parallel mechanism for micro- and nano-manipulations. Two sets of statically indeterminate leaf parallelograms are employed to provide the decoupling effect, and the displacement of the piezoelectric actuator (PEA) is amplified with a statically indeterminate lever mechanism. Due to the static indeterminacy, the load-deflection relationship of the mechanism is nonlinear. Computational analysis is utilized to investigate the nonlinearity. Computational results reveal that the structural nonlinearities of the mechanism is negligible within the maximum driving force of the PEA. The influence of the contact interface and the load mass is also investigated through computational analyses. Ultimately, a prototype is fabricated and a laser interferometer measurement system is established to obtain the position and velocity of the prototype. A number of experiments are performed to investigate the performance of the prototype. Experimental results show that the developed prototype has achieved a workspace of 82×82 μm 2 , a first natural frequency of 423 Hz (with a 53.4 g load mass), and a cross-axis coupling ratio below 1%.

关键词： Prototypes Frequency measurement Force Couplings Measurement by laser beam Stress Hysteresis

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A study of helical Lamb wave propagation on two hollow cylinders with imperfect contact conditions

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AIP Conference Proceedings 2013年第1期1511卷 67-74页

作者： A. Balvantin A. Baltazar J.-Y. Kim Robotics and Advanced Manufacturing Program CINVESTAV Unidad-Saltillo Ramos Arizpe Coahuila 25900 Mexico GWW School of Mechanical Engineering Georgia Institute of Technology Atlanta Georgia 30332 USA

The effects of varying interfacial conditions between two contacting hollow cylinders on the propagation of helical Lamb waves are studied. Experiments were carried out on two aluminum hollow cylinders (114 mm in outer-diameter and 6 mm of wall thickness) axially loaded by a horizontal press to control contact interfacial stiffness. An ultrasonic measurement setup using broadband transducers, with semispherical contact probes coupled to the cylinders surface, in a pitchcatch configuration is presented. Time-frequency representation (TFR) is employed to accurately perform mode identification of ultrasonic captured signals. The effect of different interfacial contact conditions in mechanically joined cylinders into propagation parameters of helical Lamb waves is studied. Finally, a comparison of sensitivity, between Lamb waves in straight and helical propagating paths, under different interfacial conditions is presented.

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Corrections to “Design, Modeling, and Control of a Coaxially Aligned Steerable (COAST) Guidewire Robot” [Jul 20 4947-4954]

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IEEE robotics and Automation Letters 2023年第11期8卷 7823-7824页

作者： Seokhwan Jeong Yash Chitalia Jaydev P. Desai Medical Robotics and Automation (RoboMed) Laboratory Georgia Institute of Technology Atlanta GA USA Department of Mechanical Engineering Sogang University Seoul South Korea Healthcare Robotics and Telesurgery (HeaRT) Laboratory Department of Mechanical Engineering University of Louisville Louisville KY USA RoboMed Laboratory Wallace H. Coulter Department of Biomedical Engineering Georgia Institute of Technology Atlanta GA USA

Presents corrections to the article “Design, Modeling, and Control of a Coaxially Aligned Steerable (COAST) Guidewire Robot”.

关键词： Medical robotics Catheters Position control Blood vessels Wires

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Experimental Correlation for the Effect of Metallurgical Parameters on the Hardness of 356 and 319 Aluminum Alloys Using Minitab Software

Experimental Correlation for the Effect of Metallurgical Par...

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2013 2nd International Conference on Materials Science and Technology(ICMST 2013)

作者： MAHMOUD M.TASH S.Alkahtani Industrial Engineering Program Mechanical Engineering Department College of EngineeringSalman bin AbdulAziz University on leave from the Mining Petroleum and Metallurgical Engineering Department Cairo University

The present study was undertaken to investigate the effect of metallurgical parameters on the hardness and microstructural characterisations of as-cast and heat-treated 356 and 319 alloys, with the aim of adjusting these parameters to produce castings of suitable hardness and Feintermetallic volume fractions for subsequent use in studies relating to the machinability of these alloys. Hardness measurements were carried out on specimens prepared from 356 and 319 alloys in the as-cast and heat-treated conditions, using different combinations of grain refining, Srmodification, and alloying additions. Aging treatments were carried out at 155?C, 180?C, 200?C, and 220?C for 4 h, followed by air cooling, as well as at 180?C and 220?C for 2, 4, 6, and 8 h. Peak hardness was observed in 356 alloys when aging was carried out at 180oC/4h. In the case of unmodified or modified 356 alloys containing mostly α-Fe intermetallics, aging at 180?C up to 8h produced a sharp rise in hardness during the first two hours of aging, followed by a broad peak or plateau over the 2-8 h aging period. Aging at 220?C revealed a hardness peak at 2h aging time for both 356 and 319 alloys.

关键词： Experimental Correlation Metallurgical Parameters Hardness Machinability 356 and 319 Aluminum Alloys

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Virtual impedance based remote tele-collaboration with time delay

Virtual impedance based remote tele-collaboration with time ...

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IEEE International Workshop on Robot and Human Communication (ROMAN)

作者： Nak Young Chong T. Kotoku K. Ohba K. Komoriya N. Matsuhira K. Taniel Robotics Department Mechanical Engineering Laboratory Tsukuba Japan R & D Center Mechanical Systems Laboratory Toshiba Corporation Kawasaki Japan

ISBN: (纸本)0780358414

A collision-free coordinated control scheme is discussed for multi-operator-multi-robot (MOMR) teleoperation through a network with communication time delay. Collaboration tasks have rapidly emerged in many possible applications such as the plant maintenance, construction, and surgery, because multi-robot collaboration would have a significant advantage over a single robot in such cases. However, the effect of time-delay would pose a more difficult problem to MOMR teleoperation systems and seriously affect their performance. In this work, the virtual impedance based coordinated control method is proposed to cope with collision arising from the communication delay in the MOMR teleoperation system. We impose a variable impedance on the master hand and change the impedance according to the distance between two slave arms in the local predictor simulator. When a possible collision is expected during the task, a high impedance is set to master hand and signals the operator to stop or to change her master command. This adjustable impedance of the master hand safely guides an operator through unexpected collisions in time-delayed MOMR teleoperation. To verify the validity of the proposed scheme, an experimental setup is built and a block arrangement task is performed by two slave arms based on simulation models.

关键词： Impedance Delay effects Communication system control Arm Collaboration Surgery Collaborative work Robot kinematics Control systems Master-slave

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A simplified model for a biomechanical joint with soft cartilage

A simplified model for a biomechanical joint with soft carti...

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IEEE International Conference on Systems, Man and Cybernetics

作者： A. Vaz S. Hirai Department of Mechanical Engineering SHSL-CET Sangrur Punjab India Department of Robotics Ritsumeikan University Kusatsu Shiga Japan

The modeling of joints on human limbs involves complexities due to the presence of articular cartilage at the synovial joint interface between mating bones, and the geometries involved. In this work, a simple yet innovative model for such a joint which can still capture most of the behavior of the bone joint system is presented. The model is applied to a ball and socket joint system with soft cartilage. The functional role of the soft cartilage material is replaced by a nonlinear stiffness field, whose properties are defined with relation to the ball position with respect to any fixed reference point within the socket. Bond graph modeling and simulation are used to study the system dynamics. Simulations indicate that this simple but significant model holds promise for applications in simulation, control of biomechanical, robotic and virtual reality based devices

关键词： Joints Bones Sockets Solid modeling Humans Geometry Bonding Nonlinear dynamical systems Robot control Virtual reality

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Analysis on kinematics of robot fish

Analysis on kinematics of robot fish

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International Conference on Control, Automation and Systems ( ICCAS)

作者： Dong-Won Yun Jin-Ho Kyung Young-Su Son Soo-Hyun Kim Department of Robotics and intelligent Machinery KIMM Daejeon South Korea Department of Mechanical Engineering KAIST Daejeon South Korea

This paper presents a numerical analysis for kinematics of robot fish. The fish model in this paper is assumed to act as carangiform motion. The carangiform motion can be modeled as several serial links, and generally robot fish is composed of motors and links. In this research, some analysis has been performed for calculation of kinematics of robot fish. To do this, a geometrical numerical method has been used and a code is made for N-link robot fish kinematics.

关键词： Marine animals Mathematical model Fasteners Equations Kinematics Robot sensing systems

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A Comprehensive Measurement of Bubbly Flow in a 30 mm × 10 mm Rectangular Channel 20

A Comprehensive Measurement of Bubbly Flow in a 30 mm × 10 ...

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20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2023

作者： Wang, Dewei Fu, Yucheng Sun, Hanxing Liu, Yang Liu, Qingqing Liu, Yang Sun, Xiaodong Worosz, Ted Buchanan, John Nuclear Engineering Program Department of Mechanical Engineering Virginia Tech 635 Price Fork Road BlacksburgVA24061 United States Department of Nuclear Engineering and Radiological Sciences University of Michigan 2355 Bonisteel Blvd Ann ArborMI48109 United States Naval Nuclear Laboratory PO Box 79 West MifflinPA15122 United States

ISBN: (纸本)9780894487934

One major obstacle hindering the advancement of modeling and simulation capabilities of two-phase flows is the lack of high-quality, high-resolution experimental data for model development and model/code validation. To close this gap, this study aims to obtain a high-fidelity local two-phase flow dataset in a vertical 30 mm × 10 mm rectangular channel. A system combining the double-sensor conductivity probe and high-speed imaging technique is utilized to obtain the gas-phase data. The double-sensor conductivity probe measures the local time-averaged two-phase flow parameters over the cross-section, while a multi-camera imaging system captures the bubble shape, orientation, and size information. This information is then used as the input to a Monte Carlo reconstruction program to evaluate and eliminate the known systematic uncertainties in the probe measurement. The Particle Image Velocimetry and Planar Laser-Induced Fluorescence (PIV-PLIF) technique is employed as the main tool for the liquid-phase measurement. The acquired dataset covers three bubbly flow conditions measured at three axial locations to capture the flow development. The superficial gas and liquid velocities range from 0.03 to 0.25 m/s and from 0.8 to 3 m/s, respectively. The measured local data include the time-averaged void fraction, bubble velocity, interfacial area concentration, bubble frequency, liquid velocity, and turbulence quantities. The data show that the void fraction distributions for each run can exhibit quite different profiles which also evolve along the test section. However, both the gas-phase and liquid-phase velocity data show quite uniform distributions across much of the cross-sectional plane and show little dependence on the void fraction distribution for the two-phase flows studied in this paper. © 2023 Proceedings of the 20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2023. All rights reserved.

关键词： Two phase flow

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