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

共 3195 条记录，以下是321-330 订阅

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Forced Response Reduction of a Turbine Impeller 14th

Forced Response Reduction of a Turbine Impeller

引用

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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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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Development of a Multibody-Based Dynamic Model of the Rear Hitch Subsystem of an Agricultural Tractor 5th

Development of a Multibody-Based Dynamic Model of the Rear H...

引用

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

作者： Roychoudhury, Arka Martini, Alberto Univ Modena & Reggio Emilia Dept Engn Modena Italy Univ Bologna Dept Ind Engn Bologna Italy

ISBN: (纸本)9783031645556;9783031645532;9783031645525

This work deals with the implementation of the dynamic model of a subsystem typically present in agricultural tractors, namely a mechanical-hydraulic digital twin of the rear hitch. A multibody model of the rear hitch mechanical subsystem was developed in Simscape Multibody and integrated with the hydraulic system model developed in Simulink. Finally, a preliminary control logic to ensure the correct operation of the device was designed and its performance was assessed through simulations. The first simulation results appear promising.

关键词： digital twin vehicle dynamics multibody dynamics hydraulic model closed-loop control system

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Design and Test Validation of Humanoid Tripod-Based Limbs 33rd

Design and Test Validation of Humanoid Tripod-Based Limbs

引用

33rd International Conference on Robotics in Alpe-Adria-Danube Region (RAAD)

作者： Ceccarelli, Marco Ofonaike, Earnest Beaumont, Steven Neves, Leo Russo, Matteo Univ Roma Tor Vergata I-00133 Rome Italy Univ Toulon & Var SeaTech Sch Engn Toulon France

ISBN: (纸本)9783031592591;9783031592577;9783031592560

A tripod-based design with linear actuators is presented with features and performance suitable for humanoid limbs as based on a tripod mechanism architecture. Design compact solutions are developed for arm and leg structures with low-cost Arduino-based controlled operation and market components for a revised version of LARMbot humanoid robot. A general design is then specified in an arm structure with a gripper on a wrist joint and in a leg structure with a foot on an ankle joint. Performance characteristics are characterized in lab tests with suitable large motion range, high payload capacity, and limited power consumption.

关键词： Humanoid robots Design Tripod design LARMbot humanoid Experimental robotics Performance analysis

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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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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...

引用

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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Experimental Evaluation of Centralized Control Strategies on a 5R Robot 5th

Experimental Evaluation of Centralized Control Strategies on...

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

作者： Righettini, Paolo Strada, Roberto Cortinovis, Filippo Univ Bergamo Dept Engn & Appl Sci Viale Marconi 5 I-24044 Dalmine Italy

ISBN: (纸本)9783031645556;9783031645532;9783031645525

Parallel kinematics robots are often used in high-speed pick and place applications, since their mechanical characteristics result in superior dynamic performance. Achievable speed and accelerations are also affected by the control algorithm, with centralized controllers typically leading to substantial improvements over decentralized ones. Several centralized control algorithms are therefore described in the literature, and often tested in simulation or through the execution of simple and slow movements. This article compares two centralized inverse dynamics motion control systems applied to a 5R parallel robot: one featuring integral contributions, the other characterized by sliding mode terms. The test trajectory is representative of a fast pick and place operation on two moving conveyor belts;the experimental findings concern, for the two regulators, the achieved errors, the overall control torques, and the several contributions to the control action. The results show that the integral regulator achieves overall smaller tracking errors, even though high-curvature portions of the test trajectory are better tracked using the Sliding Mode Control algorithm.

关键词： Parallel robot dynamic modelling inverse dynamics control sliding mode control

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Kinematic and Dynamic Analysis of a New Prototype Exoskeleton for Human Lower Limb Rehabilitation 8th

Kinematic and Dynamic Analysis of a New Prototype Exoskeleto...

引用

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

作者： Geonea, Ionut Racila, Laurentiu Dumitru, Ilie Grigorie, Laura Romanescu, Alina Rosca, Sorin Tarnita, Daniela Univ Craiova Fac Mech Craiova Romania

ISBN: (纸本)9783031598906;9783031598883;9783031598876

In this paper, a new constructive model of an exoskeleton robotic system for human lower limb rehabilitation is presented. This robotic system uses as a constructive solution of the leg, a mono-mobile planar kinematic chain, which has an original structure. The constructive solution of the leg mechanism is designed and kinematically analysed when operating with the upper frame fixed to the base, but also when walking on a flat surface. The gait simulation is carried out by building a dynamic multibody model with the help of ADAMS dynamic analysis software for mobile mechanical systems. The results obtained for kinematic and dynamic parameters are analysed and conclusions on the feasibility and performance of the robotic system are presented.

关键词： Robotic system Exoskeleton rehabilitation Dynamic analysis Biped mechanism

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Modern Quality Control: Integrating Computer Vision in Inspection of PCB Elements 33rd

Modern Quality Control: Integrating Computer Vision in Inspe...

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33rd International Conference on Robotics in Alpe-Adria-Danube Region (RAAD)

作者： Siktar, Luka Suligoj, Filip Svaco, Marko Caran, Branimir Univ Zagreb Fac Mech Engn & Naval Architecture Zagreb Croatia

ISBN: (纸本)9783031592591;9783031592577;9783031592560

This study introduces a computer vision application for the automated detection, localization, and inspection of microcontroller boards and Single Board Computers, generally referred to as Printed Circuit Boards (PCBs), as part of the quality control process. Given the key role of quality control in product pricing for systems with automated and robotized production, there is an imperative to enhance its speed and cost-effectiveness. To address this, we propose the utilization of computer vision tools, particularly deep neural networks. The proposed system encompasses several modules: PCB detection and component verification using YOLOv8 convolutional neural network (CNN), targeted image extraction of components, solder joint quality assessment via adaptive thresholding and optical character recognition (OCR) on selected images. The overreaching goal is to devise a practical industry application of computer vision for adaptable quality control. This system's development involved PCB dataset creation, neural network training, and the development of final implementation. The trained YOLOv8 neural network achieves Mean Average Precision (mAP) of 99.5%, the proposed inspection system scores 96.1% precision and 97.8% recall. The OCR model scores 95.6% true positive character predictions.

关键词： Computer vision PCB Adaptive thresholding YOLOv8 OCR

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