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检索条件"丛书名=Mechanisms and Machine Science"

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Air-Dynamic Measurements on "S" Shape Hydrofoils 12th

Air-Dynamic Measurements on "S" Shape Hydrofoils

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12th International Conference of machine and Industrial Design in Mechanical Engineering

作者： Manea, Adriana-Sida Stroita, Daniel-Catalin Bordeasu, Ilare Ghera, Cristian Luca, Alexandru-Nicolae Politehn Univ Timisoara Timisoara Romania

ISBN: (纸本)9783031805141;9783031805127;9783031805110

The "S" shape hydrofoils are commonly used in reversible hydro-machines which can run in both pump and turbine regime. The hydraulic machinery team from "Politehnica" University of Timisoara has the "know how" experience in the design of hydrofoils of hydraulic pumps and turbines. This paper presents the measurement methodology and the experimental results for a "S" type hydrofoil used for the wicket gate of a reversible hydraulic machine. The measurements are done in an open circuit wind tunnel of the Air-dynamic Laboratory of Mechanical Faculty.

关键词： Hydrofoil Wind Tunnel Hydraulic machines

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Dynamic Vehicle Dashboard Design for Reduced Driver Distraction 12th

Dynamic Vehicle Dashboard Design for Reduced Driver Distract...

引用

12th International Conference of machine and Industrial Design in Mechanical Engineering

作者： Nagy, Viktor Sandor, Agoston Pal Szechenyi Istvan Univ Egyet Ter 1 Gyor Hungary

ISBN: (纸本)9783031805141;9783031805127;9783031805110

In the context of contemporary vehicle dashboard systems, advanced In-Vehicle Information Systems (IVIS) often employ touchscreen functionalities, and multi-layered menu structures. However, these solutions have been identified as more distracting for drivers compared to traditional tactile switches and buttons with single, dedicated functions. Our primary focus is on exploring the design capabilities of dynamic vehicle center console interfaces, leading to the inception of the Dynamic Human-Computer Interface System (DHCIS). DHCIS employs a context-aware, adaptive functional framework structure, which, rather than relying on deep menu layers, enhances the safety level in varied traffic situations by simplifying controls to one-touch features. The design concept has been compared with a generic user interface in terms of the handling method, operational steps and layout design.

关键词： Driver Distraction In-Vehicle Information System Human-Computer Interface Context-aware

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Physical Layer Security of RIS-Assisted Uplink NOMA System 30th

Physical Layer Security of RIS-Assisted Uplink NOMA System

引用

30th International Conference on Computational and Experimental Engineering and sciences

作者： Wang, Xinshui Ge, Jimin Wang, Xu Lei, Yuxia Qufu Normal Univ Sch Comp Sci Rizhao 276826 Shandong Peoples R China

ISBN: (纸本)9783031774911;9783031774898;9783031774881

The recently emerged Reconfigurable Intelligent Surface (RIS) technology can realize the reconfiguration of the wireless environment, thereby improving the performance of wireless communication systems. Therefore, it has attracted the attention and research of many scholars. Based on this, this paper studies the method of RIS to enhance the security of uplink non-orthogonal multiple access (NOMA) communication systems. Our objective is to maximize the secrecy rate of the system by jointly optimizing the user transmit power, the receive beamforming at the base station (BS) and the RIS phase shift matrix. In order to make the original extremely complex non-convex problem tractable, we use an alternating algorithm to transform the original optimization problem into three tractable sub-problems. Among them, sub-problem 2 and subproblem 3 are solved by fractional programming (FP), Dinkelbach algorithm, majorization-minimization (MM) algorithm, and Lagrange multiplier method respectively. Finally, the numerical simulation results verify that the scheme proposed in this article can significantly improve the secrecy rate performance of the communication system.

关键词： Reconfigurable Intelligent Surface (RIS) Non-Orthogonal Multiple Access (NOMA) Uplink Secrecy Rate

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Design of a Fully Electric Scaled Vehicle Model with 4 Independent Motors 5th

Design of a Fully Electric Scaled Vehicle Model with 4 Indep...

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5th International Conference of International-Federation-for-the-Promotion-of-Mechanism-and-machine-science Italy (IFToMM Italy)

作者： Costantini, Mario Tristano, Mariagrazia De Castro, Ricardo Massaro, Matteo Lot, Roberto Ortombina, Ludovico Lenzo, Basilio Univ Padua Via Venezia 1 I-35131 Padua Italy Univ Calif Merced Merced CA 95343 USA

ISBN: (纸本)9783031645716;9783031645693;9783031645686

Scaled vehicles provide cost-effective solutions for studying vehicle behaviour and designing and experimentally testing advanced vehicle dynamics controllers. This work presents the design and development of a fully electric scaled vehicle model featuring four independent in-wheel motors. The research and component selection processes are discussed, as well as the suspension system redesign to accommodate the motors and the chosen motor controller. The findings presented in this paper will form the basis for future vehicle characterisation and subsequent testing by means of torque vectoring and drifting manoeuvres.

关键词： Scaled vehicle Independent motors Vehicle design

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Development of a Mechatronic System for Semiconductor Resistivity Measurements 9th

Development of a Mechatronic System for Semiconductor Resist...

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9th European Conference on Mechanism science (EuCoMeS)

作者： Galli, Davide Morelato, Dylan Odorizzi, Renzo Vidoni, Renato Free Univ Bolzano Fac Engn I-39100 Bolzano Italy MEMC Elect Mat SpA Via Nazl 55 I-39012 Merano Italy

ISBN: (纸本)9783031672972;9783031672958;9783031672941

Metrology is crucial in monocrystalline silicon production as it ensures precise control over quality indexes of the product. Resistivity is a key parameter that is accurately measured to define the quality of an ingot. Manual resistivity measurement is currently undergoing an automation process, which arise the need of more flexible and compliant systems able to cope with the different sizes and shapes of the product. In this work, the functional mechanical design of a new end-effector for an automatic resistivity measurement machine is firstly addressed. After that, a mechanoelastic model is developed, its parameters retrieved and selected, and numerical tests performed. The preliminary results, obtained through numerical experiments, show that the newly designed end-effector is capable of adapting itself to highly irregular surfaces and, thus, to increase the feasible measurement points with respect to a rigid system. The proposed mechanism offers a promising solution to hit the high standards of monocrystalline silicon quality control, ultimately contributing to the advancement of semiconductor manufacturing processes.

关键词： Metrology Resistivity Measurement Semiconductors Mechatronics Mechano-elastic model

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Numerical and Experimental Vibration Study of an Axial Piston Pump with the Focus on the Hydraulic Circuit Layout 5th

Numerical and Experimental Vibration Study of an Axial Pisto...

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5th International Conference of International-Federation-for-the-Promotion-of-Mechanism-and-machine-science Italy (IFToMM Italy)

作者： Chakroun, Ala Eddin Battarra, Mattia Mucchi, Emiliano Dalpiaz, Giorgio Univ Ferrara Engn Dept Via G Saragat 1 I-44122 Ferrara Italy

ISBN: (纸本)9783031645716;9783031645693;9783031645686

The hydraulic circuit in mechanisms can lead to vibration issues, especially with flexible pipes commonly found in test rigs, affecting pump noise, vibration, and harshness performance. This study aims to analyse circuit vibration behaviour through lumped parameter modelling and experiments. Experimental tests on a proposed pump assess outlet pressure spectrum in various test rig setups, complemented by numerical simulations. Tests are conducted within a chosen frequency range, representing realistic layouts where the hydraulic circuit setup can cause noise, vibration, and harshness anomalies. Practical design solutions are proposed to ensure consistent behaviour across the desired working range.

关键词： Axial piston pump flexible pipe hydraulic circuit lumped parameter model

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Study on Alleviating Luders Deformation with Layered Structure Based on DIC and FEM 30th

Study on Alleviating Luders Deformation with Layered Structu...

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30th International Conference on Computational and Experimental Engineering and sciences

作者： Jiang, Xingrui Wu, He Sun, Wei Li, Rengeng Fan, Guohua Chen, Min Xian Jiaotong Liverpool Univ Sch Adv Technol Suzhou 215123 Peoples R China Nanjing Tech Univ Key Lab Light Weight Mat Nanjing 210009 Peoples R China Yangtze Delta Adv Mat Res Inst Suzhou 215000 Peoples R China

ISBN: (纸本)9783031774911;9783031774898;9783031774881

Luders deformation is a persistent challenge in metallic material science and widely observed across various materials. Luders band manifests as local plastic instability and hinders engineering applications. In recent years, heterogeneous structures have been shown to suppress local strain concentration and can help mitigate Luders deformation. This study investigates the impact of layered structures on Luders deformation in bi-layered steel/aluminum sheet materials with varying thickness ratios. Utilizing digital image correlation (DIC) and finite element (FE) modeling, the study finds that the inclusion of an aluminum layer reduces the magnitude of Luders deformation of the steel/aluminum sheet. This leads to decreases in both upper and lower yield strengths and in Luders strain as the thickness ratio decreases. FE analysis reveals that Luders strain is primarily influenced by the product of stress drop and the local stress peak width ratio at the Luders front. This study offers valuable insights into alleviating Luders deformation through heterogeneous structural design.

关键词： Luders deformation layer structure thickness ratio digital image correlation finite element simulation

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Numerical Simulation of Hydraulic Fracture Propagation on the Horizontal Well in Fractured Carbonate Reservoirs 30th

Numerical Simulation of Hydraulic Fracture Propagation on th...

引用

30th International Conference on Computational and Experimental Engineering and sciences

作者： Ge, Xiaoxin Shi, Xian Jiang, Shu Zhu, Guangyou Mao, Haijun Liu, Jingshou Ni, Hongjian Han, Lei China Univ Petr East China Coll Petr Engn Qingdao Peoples R China China Univ Petr East China Natl Key Lab Deep Oil & Gas Qingdao Peoples R China China Univ Geosci Key Lab Tecton & Petr Resources Minist Educ Wuhan Peoples R China Yangtze Univ Sch Geosci Wuhan Peoples R China PetroChina Res Inst Petr Explorat Dev Beijing Peoples R China Chinese Acad Sci Inst Rock & Soil Mech State Key Lab Geomechan & Geotechn Engn Wuhan Hubei Peoples R China

ISBN: (纸本)9783031816758;9783031816734;9783031816727

Hydraulic fracturing technology has become indispensable for improving productivity in unconventional reservoirs. This research explores the fracture mechanisms of complex fracture networks (CFN) during the multistage fracturing process within reservoirs containing natural fractures (NFs) for carbonate reservoirs. Employing a two-dimensional plane strain model and numerical simulations, the study investigates various factors influencing CFN, encompassing different hydraulic fracturing scenarios, cluster spacing, strength weakening coefficient, and natural fracture angle. By incorporating global zero-thickness cohesive elements to characterize natural and hydraulic fractures. The simulation results indicate that when the perforation cluster spacing is 40 meters, the strength weakening coefficient is 0.45, and the natural fracture angle is 60 degrees, each of these factors conducive to the uniform propagation of fractures in all clusters. In addition, the injection of temporarily plugging agents on the frature propagation is also studied, indicating the temporarily plugging staged fracturing (TPSF) can effectively reactivate suppression fractures and increase chances of uniform fracture propagation. The findings are beneficial for hydraulic fracture propagation under various conditions in natural fractured carbonates reservoirs and offer recommendations for efficient hydraulic fracturing treatment.

关键词： Hydraulic fracture Complex fracture network propagation Multistage fracturing Temporarily plugging Fractured carbonate reservoirs

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Development of the Modular Finger Elements of an Actuated Glove for Hand Rehabilitation 5th

Development of the Modular Finger Elements of an Actuated Gl...

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5th International Conference of International-Federation-for-the-Promotion-of-Mechanism-and-machine-science Italy (IFToMM Italy)

作者： Dragusanu, Mihai Saeed, Anjum Guinet, Nicolas Troisi, Danilo Prattichizzo, Domenico Malvezzi, Monica Univ Siena Dept Informat Engn & Math Siena Italy

ISBN: (纸本)9783031645716;9783031645693;9783031645686

Robotic rehabilitation requires personalized, versatile, and efficient devices. In this paper, we focus on hand rehabilitation and propose a tendon-actuated, modular, and adaptable glove. More specifically, in the paper we investigate the kinematics relationships between tendon actuators and hand motion and present the implementation of two different finger modules, on which some experimental tests involving a user are performed.

关键词： robotic rehabilitation hand exoskeleton soft robotics

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Robocasting of Glass-Ceramic Material PGP 14th

Robocasting of Glass-Ceramic Material PGP

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14th International Conference on the Theory of machines and mechanisms (TMM)

作者： Svejcar, Filip Kehlerova, Gabriela Stara, Marie Matusek, Ondrej Tech Univ Liberec Studentska 1402-2 Liberec 46117 Czech Republic

ISBN: (纸本)9783031702532;9783031702518;9783031702501

This article presents the research conducted in the field of robocasting of a developed glass-ceramic material using the material extrusion technique. Firstly, the rheological properties of the glass-ceramic material were investigated to determine the optimal viscosity of the extruded material. An important factor is that the material maintains a consistent shape after being applied to the baseplate. Subsequently, a robotic workplace was created and the initial requirements for achieving optimal production parameters were investigated. In addition to the laboratory environment, the pressure, speed, and path of the applied material as well as the stroke between the individual layers were found to be significant. In the conclusion to the paper, a new technical solution to the given issue is presented, where the proposed structural design of the extruder is compared to a numerical model in the *** environment.

关键词： Robocasting Robotic 3D print Glass-Ceramic Porous Glass Plasticine

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