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

共 3195 条记录，以下是381-390 订阅

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Damping Characteristics Identification for Custom-Made Winding Device 14th

Damping Characteristics Identification for Custom-Made Windi...

引用

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

作者： Milucky, Jan Zabka, Petr Barta, Michal Tech Univ Liberec Studentska 1402-2 Liberec 46117 Czech Republic

ISBN: (纸本)9783031702532;9783031702518;9783031702501

This paper aims to determine the damping characteristics needed to diminish oscillations developing in a positioning system of a winding device while under operating conditions. This damper is being selected for a specially made universal winding device designed for creating bobbins and filters made of textile, composite nanofibrous and pure nanofibrous yarns. Because some of the processed materials are inherently delicate, it is necessary to have a higher precision of support pressure control. The main focus of this work is to demonstrate practical steps in determining parameters for selecting optimal motion damper. Multiple experiments were conducted to determine the positioning spring stiffness, moving masses' moment of inertia, and damping characteristics, which are mainly present due to friction. Using the data from experiments, the frequency response of the system was measured as well. Using available information, the optimal damping factor was determined, which will serve for the selection of a suitable damper.

关键词： Winding device vibration diagnostic damping characteristics

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Vibro-Acoustic Analysis of an Electric Powertrain: An Evaluation of the Relative Contribution of Gear Whine Noise and Electromagnetic Excitations on the Overall Response 5th

Vibro-Acoustic Analysis of an Electric Powertrain: An Evalua...

引用

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

作者： De Donno, Giorgio Ciravegna, Luca Galvagno, Enrico Ferrari, Simone Pellegrino, Gianmario Iannone, Matteo Politecn Torino Dept Mech & Aerosp Engn Turin Italy Politecn Torino Energy Dept Galileo Ferraris Turin Italy D&E Hexagon Genoa Italy

ISBN: (纸本)9783031645556;9783031645532;9783031645525

The NVH (Noise, Vibration, Harshness) performance of electric vehicles is gaining critical importance nowadays. Sources of different nature are responsible for the production of vibrations and noises in electric powertrains: namely, mechanical and electromagnetic excitations are worth investigating, both leading to relevant vibroacoustic responses. The mechanical source considered in this paper is the transmission error (TE);radial and tangential forces acting on stator teeth, as well as torque ripple acting on the rotor are the electromagnetic sources included. The modelling and simulation of the vibroacoustic performance of an electric powertrain for vehicle traction is carried out using a specialised commercial software, Romax. The NVH problem is first approached with the aim of weighting separately the contributions to the acoustic response due to mechanical and electromagnetic excitations. The difference between spur and helical gears is analyzed in terms of TE excitation harmonics, and the benefits brought by microgeometry corrections discussed. Waterfall and operational deflection shapes analysis has been used to identify the cause of some resonances (e.g. stator breathing mode) excited by the different vibrational sources.

关键词： Electric powertrain NVH vibro-acoustic analysis transmission error gear whine microgeometry optimization electromagnetic excitations torque ripple dynamic system modelling frequency domain simulation

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Revolutionizing Speech Emotion Recognition: A Novel Hilbert Curve Approach for Two-Dimensional Representation and Convolutional Neural Network Classification 33rd

Revolutionizing Speech Emotion Recognition: A Novel Hilbert ...

引用

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

作者： Tyagi, Suryakant Szenasi, Sandor Obuda Univ Doctoral Sch Appl Informat & Appl Math H-1034 Budapest Hungary Obuda Univ John Von Neumann Fac Informat Budapest Hungary J Selye Univ Fac Econ & Informat Komarno Slovakia

ISBN: (纸本)9783031592591;9783031592577;9783031592560

Emotions are integral to human existence, influencing psychological wellbeing and permeating various aspects of daily life. Speech emotion recognition (SER) stands as a pivotal branch of emotion detection, focusing on decoding the acoustic nuances embedded in speech signals. This study delves into the landscape of SER, addressing challenges related to feature extraction and classifier development. Inspired by the Hilbert curve, a novel approach is proposed, converting one-dimensional time series data into informative two-dimensional images. A convolutional neural network extracts features from these images, and a fully connected network processes these features for sentiment classification. The study comprehensively evaluates this method across four diverse datasets, namely RAVDESS, TESS, SAVEE, and EmoDB. The proposed algorithm demonstrates promising results, showcasing potential advantages in emotion recognition tasks. Comparative analyses with existing methodologies, including Gram Angle Fields (GAF) and CyTex, affirm the feasibility and effectiveness of the proposed algorithm. The study contributes to advancing sentiment recognition by transforming time-series data into two-dimensional images, thereby opening new avenues in speech emotion recognition with improved accuracy and performance. The paper outlines the algorithms employed, details the methodology, presents experimental results, and concludes with reflections on findings and potential future directions.

关键词： Speech emotion recognition (SER) Hilbert curve TESS Gram angle fields CyTex

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Conceptual Design of Hybrid Thrustered Cable-Suspended Parallel Robots 5th

Conceptual Design of Hybrid Thrustered Cable-Suspended Paral...

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

作者： Feng, Yifan Sugahara, Yusuke Jiang, Ming Ceccarelli, Marco Takeda, Yukio Tokyo Inst Technol Sch Engn Dept Mech Engn Tokyo Japan Tokyo Inst Technol Sch Engn Int Res Frontiers Initiat Tokyo Japan Univ Roma Tor Vergata Dept Mech Engn Rome Italy

ISBN: (纸本)9783031645556;9783031645532;9783031645525

This paper presents an innovative design of 6-degree-of-freedom hybrid thrustered cable-suspended parallel robots, merging the attributes of a cable-suspended parallel robots with propeller thrusters. This hybridization aims to overcome the limitations inherent in conventional cable-suspended parallel robots, which depend significantly on the mass of the end-effector for maintaining cable tension. Traditional cable-suspended parallel robots face a significant challenge: a lightweight end-effector limits the workspace. This limitation occurs because certain required poses cause the cable tension to drop below a critical minimum threshold, rendering the cables uncontrollable and thus making these poses infeasible. Conversely, employing a heavier end-effector compromises both acceleration and safety. The proposed approach gives a design that equips an end-effector with propeller thrusters, introducing additional driving forces and moments to enhance the system's overall performance. Conceptual design is introduced, alongside a general model and a specific example with static equilibrium models analyzed, demonstrating that the application of propeller thrusters effectively resolves this challenge.

关键词： hybrid thrustered cable-suspended parallel robots design modeling analysis

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MELEW-3: Quadruped-Wheeled Robot with 4-DoFs and An Active Wheel on One Leg 6th

MELEW-3: Quadruped-Wheeled Robot with 4-DoFs and An Active W...

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6th Symposium on Mechanism Design for Robotics (MEDER)

作者： Yamano, Junsei Suzuki, Taisei Nakahara, Takatoshi Kasahara, Yoshinobu Hashimoto, Kenji Meiji Univ Tama Ku 1-1-1 Higashi Mita Kawasaki Kanagawa 2148571 Japan Waseda Univ Wakamatsu Ku 2-7 Hibikino Kitakyushu Fukuoka 8080135 Japan

ISBN: (纸本)9783031673856;9783031673832;9783031673825

This study aims to develop a quadruped-wheeled robot, MELEW-3 (Meiji Leg-Wheeled Robot - No. 3), combining the advantages of legged and wheeled robots. The leg mechanism is a four degrees of freedom (DoF) parallel link mechanism with spherical links. It enables the robot to move its leg tips in three translational directions (forward/backward, left/right, and up/down) and rotate around its vertical axis. In addition, the leg tips have an active wheel that provides 5-DoFs per leg and 20-DoFs for the robot. Since the steering angle of the wheels can be controlled, MELEW-3, unlike other quadruped-wheeled robots, can perform smooth-wheeled locomotion such as slalom running when moving on its wheels. The size of the robot is 500 mm (width) x 690 mm (length) x 580 mm (height), and its mass is 28 kg without the battery. Through evaluation experiments, we confirmed the basic performance of the robot by achieving wheel running with rapid acceleration and deceleration, slalom running to avoid obstacles while moving on its wheels, and forward movement with coordinated leg and wheel movement.

关键词： Quadruped-wheeled robot Robot design Parallel mechanism

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Algorithm for Obtaining Balanced Specific Sliding Coefficients at the Points Where the Meshing Stars and Ends for External Spur Gears 33rd

Algorithm for Obtaining Balanced Specific Sliding Coefficien...

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

作者： Antal, T. A. Tech Univ Cluj Napoca Cluj Napoca Romania

ISBN: (纸本)9783031592591;9783031592577;9783031592560

The paper investigates the numerical possibility of obtaining equalized specific sliding coefficients for external involute spur gears based on new kinematical method that was developed in the general case of spatial gears and was customized for planar gears. The specific sliding coefficients at the points where the meshing begins (A) and ends (E) are evaluated to check if equalization is possible, then a proper numerical method is chosen and an algorithm is conceived to obtain the geometrical dimensions of the gears with optimized meshing characteristics by balanced sliding coefficients to provide longer lifetime.

关键词： Addendum modification Algorithm Balanced Profile shifting coefficients Spur gears Specific sliding coefficients

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Concepts for Algebraic Formulation of Workplace of Parallel Manipulators 14th

Concepts for Algebraic Formulation of Workplace of Parallel ...

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

作者： Ceccarelli, Marco Univ Roma Tor Vergata Dept Ind Engn I-00133 Rome Italy

ISBN: (纸本)9783031702532;9783031702518;9783031702501

Since the workspace is a functional characteristic of primary importance both in design procedures and in operational characterizations, algorithms for determining the workspace of manipulators have always attracted interest at both theoretical and practical viewpoints. In this work, a geometric-analytical approach is proposed for determining the workspace of parallel manipulators by extending a modeling and consequent formulation that in general is applied to serial manipulators. The proposed formulation of an algebraic nature is based on the modeling and description of the geometry in the workspace generation of parallel manipulators.

关键词： Workspace Parallel Manipulators Analysis

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Structural-Parametric Synthesis of Planar Motion Generating mechanisms and Manipulators 6th

Structural-Parametric Synthesis of Planar Motion Generating ...

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6th Symposium on Mechanism Design for Robotics (MEDER)

作者： Baigunchekov, Zhumadil Laribi, Med Amine Carbone, Giuseppe Qian, Li Wang Xuelin Kaiyrov, Rustem Dosbossyn, Anar Al Farabi Kazakh Natl Univ Alma Ata 050040 Kazakhstan Univ Poitiers Prime Inst CNRS Dept GMSC ENSMAUPR 3346 Poitiers France Univ Calabria Via Bucci Cubo 45C I-87036 Arcavacata Di Rende Italy Shandong Acad Sci Inst Automat Beijing Peoples R China Karaganda Buketov Univ Lab Appl Mech & Robot Karaganda 100001 Kazakhstan

ISBN: (纸本)9783031673856;9783031673832;9783031673825

This paper studies a structural parametric synthesis of the four-bar and Stephenson I, Stephenson II, Stephenson III A, Stephenson III B six-bar motion generating mechanisms. Four-bar motion generating mechanism is formed by connecting the output body and base by two negative closing kinematic chains (CKCs) of the type RR. The six-bar Stephenson I, Stephenson II, Stephenson III A, Stephenson III B motion generating mechanisms are formed by connecting the output body and base by active CKC of the type RRR and two negative CKCs of the type RR. Active and negative CKCs impose geometric constraints on the movement of the output body and they work at certain values of the geometric parameters of their links, which are determined by least- square approximation.

关键词： Motion generating mechanism Structural-parametric synthesis Least-square approximation

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Unveiling the Potential of Modular Mobile Robotic Systems. A Review 6th

Unveiling the Potential of Modular Mobile Robotic Systems. A...

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6th Symposium on Mechanism Design for Robotics (MEDER)

作者： Baneasa, Andrei Buleandra, Debora Tatar, Olimpiu Donca, Radu Tech Univ Cluj Napoca Mechatron & Machine Dynam Dept Cluj Napoca Romania

ISBN: (纸本)9783031673856;9783031673832;9783031673825

This paper delves into the realm of modular mobile robotic systems, focusing on Mobile Modular Robotic Systems and their potential applications. We discuss the advantages as well as acknowledge and explore current challenges of the field. Current and proposed applications are presented as well as examining recent advancements. Structural varieties, are categorized, providing insight into the diverse landscape of modular mobile robotic systems. The conclusion summarizes key findings, reflecting on the potential impact of such adaptive robots and suggesting avenues for future research.

关键词： modular systems mobile robots reconfigurable robots

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Digital Twin-Oriented Kinematic Modelling of a Large-Sized Mesh Welding Plant for Productivity Evaluation: a Company Case Study 6th

Digital Twin-Oriented Kinematic Modelling of a Large-Sized M...

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6th Symposium on Mechanism Design for Robotics (MEDER)

作者： Nezzi, Chiara Fink, Stefan Rauch, Erwin Vidoni, Renato Free Univ Bozen Bolzano Fac Engn Piazza Univ 1 I-39100 Bozen Bolzano Italy

ISBN: (纸本)9783031673856;9783031673832;9783031673825

As one of the most promising technologies of the digitalization era, Digital Twins constitute an interesting research topic for the worldwide scientific community. On one hand, the creation of a Digital Twin naturally evolves from a Digital Model, which should typically feature all the characteristics of the physical counterpart for the subsequent real-time synchronization with its virtual replica. On the other hand, the relevance of models' lightness becomes particularly crucial for complex mechatronic systems. This work explores potentialities and limitations of kinematic modelling towards Digital Twin applied to a company case study. A physics-based 3D simulation software has been utilized for the creation of the kinematic model of the plant in exam. Outcomes of the study are twofold: the developed model is exploited to compare productivity values in the virtual and real world;considerations regarding the evolution of the model into a complete Digital Twin are also drawn.

关键词： Digital Twin kinematic modelling simulation

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