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

共 3269 条记录，以下是311-320 订阅

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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...

引用

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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Statics Analysis of Overconstrained Link mechanisms with Structural Error 5th

Statics Analysis of Overconstrained Link Mechanisms with Str...

引用

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

作者： Habara, Daichi Iwatsuki, Nobuyuki Hoshiba, Kotaro Tokyo Inst Technol Tokyo Japan

ISBN: (纸本)9783031645556;9783031645532;9783031645525

Overconstrained mechanisms are expected to have a wide range of applications, such as solar panels in space. However, the driving torque sensitivity to structural errors in these mechanisms is not well understood. In this paper, a novel statics analysis method for overconstrained planar parallel link mechanism is proposed and formulated. By assuming each link as a cantilever Euler beam and incorporating variables such as bending angles at revolute joints, closed-loop constraint equations taking account of elastic deformation can be derived. This approach leads the unique solution of input torque, joint forces and elastic deformations. The variations in input torque and joint forces due to structural errors can be calculated. The proposed method is then applied to analyze the Hoberman mechanism.

关键词： Over-constrained mechanism Statics analysis Structural error Planar 5-bar parallel crank mechanism Hoberman mechanism

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Forced Response Reduction of a Turbine Impeller 14th

Forced Response Reduction of a Turbine Impeller

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

作者： Beirow, Bernd Nakos, Alex Golze, Mark Vogt, Damian Wirsum, Manfred Schafferus, Markus Sasakaros, Marios Brandenburg Tech Univ Cottbus Siemens Halske Ring 14 D-03046 Cottbus Germany Univ Stuttgart Pfaffenwaldring 6 D-70569 Stuttgart Germany Rhein Westfal TH Aachen Mathieustr 9 D-52054 Aachen Germany

ISBN: (纸本)9783031702532;9783031702518;9783031702501

Low engine order excitation may cause a seriously strong vibration response of radial turbine wheels manufactured in one piece. Consequently, high cycle fatigue failure might be an issue. On the other hand, recent developments have shown that using intentional mistuning of blades enables to attenuate the forced response depending on favorable aeroelastic conditions. In the present paper an intentional mistuning pattern is designed to attenuate the forced response of a 12 bladed turbine impeller focusing on the first bending mode due to an engine order 10 excitation. Resulting a more than 40% reduction of the maximum forced response is predicted by employing a reduced order model, which could be validated within test runs. Independently, the focus is on analyzing the robustness of the intentional mistuning pattern with respect to additional random mistuning caused by geometrical deviations of rotor blades and guide vanes due to manufacturing. In detail the impact of three sources of random mistuning is evaluated: Structural mistuning, aerodynamic mistuning, and forcing mistuning.

关键词： Turbine Impeller Vibration Intentional Mistuning Aeroelastics

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Robocasting of Glass-Ceramic Material PGP 14th

Robocasting of Glass-Ceramic Material PGP

引用

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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Designing Negative Poisson's Ratio Metamaterial with Tailorable Deformational Modes 30th

Designing Negative Poisson's Ratio Metamaterial with Tailora...

引用

30th International Conference on Computational and Experimental Engineering and sciences

作者： Liu, Xiliang Wang, Yihui Wu, Xuan Gao, Liang Xiao, Mi Huazhong Univ Sci & Technol State Key Lab Intelligent Mfg Equipment & Technol Wuhan 430074 Peoples R China China Nanhu Acad Elect & Informat Technol Jiaxing 314000 Peoples R China

ISBN: (纸本)9783031774911;9783031774898;9783031774881

Traditional negative Poisson's ratio (NPR) metamaterials consist of identical periodic NPR microstructures, thereby often demonstrating deterministic deformational modes under the given loads. In this paper, a novel data-driven multiscale topology optimization method is developed to design aperiodic NPR metamaterials, enabling flexible control over structural deformational modes. Initially, this method employs the homogenization method to design prototype microstructure with NPR property. Subsequently, to obtain graded microstructures with versatile NPR properties while guaranteeing their connectivity, a progressive optimization strategy is proposed. Furthermore, to enable adaptable adjustments of metamaterials' mechanical behavior, several heuristically designed graded microstructures are also generated as candidates. Utilizing the property data of these candidate microstructures, a multiscale topology optimization model is constructed to facilitate the aperiodic distribution of NPR microstructures within the NPR metamaterials. Numerical examples are presented to illustrate the effectiveness of the proposed method, showcasing its ability to design NPR metamaterials with tailorable deformational behaviors.

关键词： Metamaterial Negative Poisson's ratio Topology optimization Multiscale design Homogenization

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Analysis of the Possibility of Joining DP Steel and CFRP with Epoxy Adhesive and Hybrid Joining Technology 12th

Analysis of the Possibility of Joining DP Steel and CFRP wit...

引用

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

作者： Duric, Aleskija Klobcar, Damjan Milcic, Dragan Markovic, Biljana Samardzic, Srdan Zdravkovic, Natasa Milcic, Miodrag Univ East Sarajevo Fac Mech Engn East Sarajevo Bosnia & Herceg Univ Ljubljana Fac Mech Engn Ljubljana Slovenia Univ Nis Fac Mech Engn Nish Serbia

ISBN: (纸本)9783031805141;9783031805127;9783031805110

This research aims to analyze the possibility of joining Carbon Fiber-Reinforced Polymer (CFRP) and DP500 steel using a two-component epoxy adhesive. These two materials are representatives of a multi-material structure. In this paper, an overview of previous research in the area of adhesive joining of these materials will be given. Also, for the research, 1,0 mm thick CFRP and 1.5 mm thick DP500 steel were used. The adhesive that is used to bond previous materials is two-component epoxy adhesive LOCTITE (R) EA 9466. The obtained failure load was 11633,5 N with a displacement of 3,48 mm and the failure energy was 20,1 J. The mixed failure mode (cohesive (COH) and stock-break failure (SB), by the adhesive joint of DP500 steel and CFRP, was observed. The general conclusion is that CFRP and DP steel can be successfully joined using adhesives. Also, this research aims to show the possibilities of applying the adhesive and Resistance element welding (REW) joint together (hybrid joint) to improve the mechanical properties of the joint.

关键词： Adhesive joint Hybrid joint DP steel CFRP

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Numerical Simulation of Self-Excited Vibrations in Milling 12th

Numerical Simulation of Self-Excited Vibrations in Milling

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

作者： Mladjenovic, Cvijetin Kosarac, Aleksandar Zivkovic, Aleksandar Knezev, Milos Marinkovic, Dejan Ilic, Vojin Mejic, Luka Univ Novi Sad Fac Tech Sci Novi Sad Serbia Univ East Sarajevo Fac Mech Engn East Sarajevo Bosnia & Herceg

ISBN: (纸本)9783031805141;9783031805127;9783031805110

Self-excited vibrations in milling, commonly known as chatter, are undesirable vibrations that occur during the machining process. They result from unstable cutting conditions, often due to factors like tool geometry, cutting speeds, and workpiece material properties. These vibrations negatively impact machining precision, surface finish, tool life, and stability of the machining process in general. To avoid the mentioned negative effects, when defining cutting regimes diagrams are applied, which, depending on the spindle speed and cutting depth, illustrate the boundary between stable and unstable working area of the machine tool from the self-excitation vibrations point of view. These diagrams, known as "stability lobe diagrams," can be defined using mathematical models (analytical or numerical) or through experimental methods (such as the tangent method or sound mapping). This paper presents a newly developed numerical simulation of the milling process which aims to define the limit depth of cut, i.e. the cutting depth at which self-excited vibrations occur. To verify the proposed method, experimental tests of self-excited vibrations during the milling of aluminum Al7075 were carried out at the EMCO ConceptMill 450 machining center.

关键词： Dynamic Behavior of Machining Systems Self-Excited Vibrations Frequency Analysis Stability Lobe Diagram

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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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An Efficient Mesoscale Modelling of Composite Materials with High Particle Content and Multiple Particle Types 30th

An Efficient Mesoscale Modelling of Composite Materials with...

引用

30th International Conference on Computational and Experimental Engineering and sciences

作者： Hong, Ye Cai, Yongchang Tongji Univ Dept Geotechn Engn Coll Civil Engn Shanghai Peoples R China

ISBN: (纸本)9783031816758;9783031816734;9783031816727

A novel, generic and efficient grid point placement method (GPPM) is developed for mesoscale modelling of composite materials. In the GPPM, grid points are employed to dynamically mark the region occupied by particles and the placement region for subsequent particles. The region within the specimen suitable for generating particles in a certain size segment is provided individually and precisely to increase the probability of success, and complex particle overlap detection can be simplified as judging the grid point state recorded in an array. Therefore, the problems of particle content and computational efficiency existing in conventional modelling methods are well solved. For arbitrary particle shapes, the GPPM has a simple data structure and can directly obtain the corresponding finite element model in ABAQUS, which has a promising application in the study of composite materials. Fully-graded concrete and fibre reinforced concrete were used as examples to validate the efficiency and feasibility of the proposed method.

关键词： Composite materials Mesoscale model Grid point placement method (GPPM) Particles Fully-graded concrete

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Mechanism Design and Inverse Kinematics of a 6-DOF Hybrid Robot with Two Parallel Modules 8th

Mechanism Design and Inverse Kinematics of a 6-DOF Hybrid Ro...

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8th IFToMM International Symposium on Robotics and Mechatronics (ISRM)

作者： Mukhin, Kirill Antonov, Anton Fomin, Alexey Russian Acad Sci IMASH Ran Mech Engn Res Inst Moscow 101000 Russia

ISBN: (纸本)9783031598906;9783031598883;9783031598876

This article proposes a novel 6-DOF hybrid robot that includes two parallel modules positioned above each other. The upper module is a 4-DOF Delta-type mechanism, and the lower one is a 2-DOF mechanism with a circular rail. The suggested design provides the robot with advanced kinematic capabilities that cannot be achieved by the separate use of upper or lower modules. The article considers an algorithm of the inverse kinematics, which allows computing displacements in the actuated joints for the specified relative configuration of the modules. During the first stage of the algorithm, we determine configurations of the modules relative to the fixed base. Next, we solve the inverse kinematics for each module individually. The suggested algorithm is demonstrated with a numerical example, where we set a motion trajectory of the upper module relative to the lower one.

关键词： Mechanism design Hybrid robot Inverse kinematics Delta-type parallel mechanism Parallel mechanism with a circular rail Path modelling

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