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

共 3195 条记录，以下是421-430 订阅

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A machine Learning Approach for Running Grade Classification Using IMUs Data 8th

A Machine Learning Approach for Running Grade Classification...

引用

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

作者： Chaker, Abdelbadia Atiga, Hanin Donahue, Seth Robinson, Rachel Chebbi, Aida Bennour, Sami Hahn, Mike Univ Sousse Natl Sch Engineers Sousse Mech Lab Sousse Sousse Tunisia Univ Oregon Eugene OR 97403 USA Northwestern Univ Chicago IL 60208 USA

ISBN: (纸本)9783031598906;9783031598883;9783031598876

This paper endeavors to advance machine Learning techniques for biomechanical analysis through the classification of running grades. Employing data collected via three Inertial Measurement Unit (IMU) sensors, gait cycles were identified using a windowing technique, and a set of features from both time and frequency domain was identified and extracted. The methodology involved training and validating of three machine learning models, with performance assessed using standard metrics. Results revealed the superior performance of the quadratic support vector machine algorithm, boasting accuracy, recall, and precision metrics exceeding 99%.

关键词： IMU data Running grade Classification machine learning Features

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Assembling Modes of a 3-RRR Planar Mechanism and Its Workspace Analysis 6th

Assembling Modes of a 3-RRR Planar Mechanism and Its Workspa...

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6th Symposium on Mechanism Design for Robotics (MEDER)

作者： Buium, Florentin Doroftei, Ioan Alaci, Stelian Gheorghe Asachi Tech Univ Iasi 43 D Mangeron Blvd Iasi 700050 Romania Tech Sci Acad Romania 26 Dacia Blvd Bucharest 030167 Romania Stefan Cel Mare Univ Suceava Univ St 13 Suceava 720229 Romania

ISBN: (纸本)9783031673856;9783031673832;9783031673825

The paper intends to outline the influence of assembling mode on the workspace of a planar parallel mechanism taking into account both, the first type and the second type of singularities. These questions influence in an important manner the inverse and forward kinematics of this mechanism. The exemplifying mechanism for this purpose is a 3-RRRtype, used asmechanical structure for robot manipulators. Some results of this study can be useful in technical education or mechanism design.

关键词： assembling mode workspace analysis kinematics singularities

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PAL-HAND.Q: A Handheld Device for Bidirectional and Multimodal Haptic Interaction 5th

PAL-HAND.Q: A Handheld Device for Bidirectional and Multimod...

引用

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

作者： Duretto, Simone Colucci, Giovanni Jabari, Mohammad Quaglia, Giuseppe Politecn Torino Dept Mech & Aerosp Engn Corso Duca Abruzzi 24 I-10129 Turin Italy

ISBN: (纸本)9783031645716;9783031645693;9783031645686

This paper presents the design of a novel handheld device, named PAL-HAND.Q, that enables bidirectional and multimodal haptic interaction with a remote control unit. This device can receive inputs from the user and render both kinesthetic and tactile feedback on his fingers. This is achieved through a unique combination of deformable membranes filled with pressurized fluid and mini vibrating motors. These elements work in synergy with an integrated electro-pneumatic system which is used to control the kinesthetic feedback. These characteristics result in a compact, lightweight, and versatile device, that can be used, for instance, in rehabilitation, alternative forms of communication, and augmented/virtual reality scenarios. In conclusion, an early prototype is realized, and a few practical aspects are discussed as well.

关键词： haptics multimodal haptic feedback hand rehabilitation alternative communication telemedicine

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Study on Fatigue Life Design Method for Solder Joints of Electronic Components on Spacecraft Under Random Vibration 5th

Study on Fatigue Life Design Method for Solder Joints of Ele...

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

作者： Goto, Koudai Yasukawa, Akio Miyashita, Tomoyuki Waseda Univ Tokyo Japan

ISBN: (纸本)9783031645556;9783031645532;9783031645525

A life prediction method for solder joints of spacecraft was investigated. It is considered that the difference in crack propagation paths is the cause of significantly shortened fatigue life of solder joints under combined thermal and vibration loading. Therefore, as the first step of this study, a crack propagation simulation under random vibration was conducted. Stress analysis was performed on a model of a printed circuit board with lead components soldered to it by applying static acceleration that approximates random vibration. The solder joints on the model are divided into crack paths and others. The crack growth is reproduced by removing small elements on the crack path based on the accumulated damage. Comparing the fatigue life predicted by the analysis with the actual fatigue test results, the fatigue life predicted by the analysis is 1/5 of the actual fatigue test. The optimal method of predicting the fatigue life is the subject of future work by adjusting the conditions of the simulation and increasing the number of fatigue test samples.

关键词： Random vibration Solder Fatigue life Crack propagation analysis

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A Statistical Method to Compute the Dynamic Coefficients of a Tilting Pad Journal Bearing 5th

A Statistical Method to Compute the Dynamic Coefficients of ...

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

作者： Barsanti, Michele Ciulli, Enrico Univ Pisa Dept Civil & Ind Engn Pisa Italy

ISBN: (纸本)9783031645556;9783031645532;9783031645525

In this work, a statistical method to determine the dynamic coefficients of Tilting Pad Journal Bearings (TPJBs) is described. The method is based on a priori modelling of the dependency of the dynamic coefficients on the excitation frequency, on the estimation of the forces acting on bearing as a function of the estimated displacements (using a linear model) and, finally, on a search of the optimum functions by minimization of the squares of the normalized residuals of displacements and forces on bearings. Normalization is done by dividing the residuals by estimating the standard deviation of the forces and displacements. The results for a flooded Rocker Back TPJB are presented.

关键词： Tilting Pad Journal Bearings Statistical methods Dynamic coefficients identification

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Step-Obstacle Negotiation: A Contact Force Analysis 5th

Step-Obstacle Negotiation: A Contact Force Analysis

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

作者： Pappalettera, Antonio Galati, Rocco Mantriota, Giacomo Reina, Giulio Polytech Univ Bari Dept Mech Math & Management Bari Italy

ISBN: (纸本)9783031645716;9783031645693;9783031645686

Traverse rough terrain with a wheeled vehicle is something that happens in a lot of everyday activities. Nevertheless, tyre deformation analysis during the negotiation of an step-obstacle is still an unsolved problem. This document presents a recent study accompanied by experimental results to analyze what happens during the contact between a deformable tyre and a step-obstacle edge corner as well as what forces are exchanged between these two elements. We provide a comparison with a theoretical method too. Finally, it is shown how tyres with lower pressure can overcome a step-obstacle of greater height.

关键词： Step-obstacle negotiation Wheels Rubber Tracks Experimental testing

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Nonlinear Dynamics of Spiral Bevel Gear: Axial Bearing Stiffness Effect 5th

Nonlinear Dynamics of Spiral Bevel Gear: Axial Bearing Stiff...

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

作者： Samani, Farhad S. Molaie, Moslem Rakhshani, Shakiba Asadi, Milad Zippo, Antonio Iarriccio, Giovanni Pellicano, Francesco Univ Modena & Reggio Emilia Modena Italy Shahid Bahonar Univ Kerman Kerman Iran

ISBN: (纸本)9783031645556;9783031645532;9783031645525

The dynamic responses of power transmission systems have always been a major concern in gear design. This study examined the effects of changing the axial stiffness of the bearings on the vibration of spiral bevel gears (SBGs). SBGs are essential for transmitting power between intersecting shafts especially when it comes to high level of torque or speed. In helicopters transmission systems, to transmit the engine's power to the blads and tail, SBG is mainly used due to smooth motion at low level of noise compared with straight bevel gear. In this model, an eight-translational-rotational DOF lumped model is considered. The time-varying mesh stiffness and piecewise linear backlash function is considered during forward and reverse directions of motion. Results indicate that the axial stiffness of the pinion and gear significantly affects the system's responses.

关键词： Spiral bevel gear Axial bearing stiffness nonlinear backlash time-varying mesh stiffness 8-DOFs dynamical model

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Handcycling Assessment Through a Bench Simulator: Preliminary Analysis of IMUs Positioning on an Artificial Upper Limb Mechanism (AULM) 5th

Handcycling Assessment Through a Bench Simulator: Preliminar...

引用

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

作者： Sanguinetta, Michele Incerti, Giovanni Legnani, Giovanni Univ Brescia Dept Mech & Ind Engn Brescia Italy

ISBN: (纸本)9783031645716;9783031645693;9783031645686

Handbikes offer enhanced mobility and efficiency compared to traditional wheelchairs, particularly benefiting individuals with spinal cord injuries (SCI). Studying handcycling poses challenges due to anatomical variations and the need for minimally invasive instrumentation adaptable to various environments. This paper aims at identifying the optimal sensor configuration of Inertial Measurement Units (IMUs) for handcycling analysis. An artificial upper limb mechanism mimicking the human arm movement during handcycling was employed, evaluating the signals collected with IMUs positioned at significant locations. Acceleration captured by the IMUs was recorded and analyzed through descriptive statistics. Results suggest that some positions (D and A) may minimize the repeatability error among repetitions. Further investigation is needed to understand variations observed at the equivalent upper-arm position (B). This study lays groundwork for accurate measurement of real arm movements in future handcycling studies.

关键词： Handbike biomechanics kinematics handcycle repeatability

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Robotic Mapping and Detection of Dynamic Objects in Outdoor Environments 9th

Robotic Mapping and Detection of Dynamic Objects in Outdoor ...

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9th European Conference on Mechanism science (EuCoMeS)

作者： Fasiolo, Diego Tiozzo Scalera, Lorenzo Maset, Eleonora Gasparetto, Alessandro Univ Udine Udine Italy

ISBN: (纸本)9783031672972;9783031672958;9783031672941

This paper presents an approach for robotic mapping in dynamic environments. Thanks to a detection method based on the notion of free space, scanned points are classified as belonging to static or moving objects. The detected dynamic points are filtered from the point cloud of the environment, and a 2D heat map showing the distribution of the moving objects in the surveyed area is built. Experimental tests are carried out with an autonomous tracked mobile robot equipped with a 3D LiDAR sensor, a 9-axis IMU, and a GNSS receiver in a parking lot. The results demonstrate the feasibility of the approach in a mapping task with dynamic objects.

关键词： mobile robotics SLAM 3D mapping autonomous navigation dynamic environment

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Modelling and Control of a Fuel Cell and Battery Electric Vehicle for Energy Optimization 5th

Modelling and Control of a Fuel Cell and Battery Electric Ve...

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

作者： Imberti, Giovanni Pinheiro, Henrique de Carvalho Carello, Massimiliana Politecn Torino Dept Mech & Aerosp Engn Turin Italy

ISBN: (纸本)9783031645716;9783031645693;9783031645686

The paper describes the development of an energetic model to define a hybrid fuel cell + battery electric vehicle for performance analysis and the powertrain optimization. In fact, it is fundamental to balance battery powertrain, also considering the higher mass needed for such type of energy storage systems. The purpose of the paper is to develop a model capable of evaluating the consumption of a vehicle with an electric motor, finding the optimal ratio between the number of cells of the battery and the hydrogen mass to be sent in a fuel cell, to ensure a given range of 800 km. The model also describes the repartition strategy between the Fuel-cell and the battery powertrain, to maximize the efficiency of both the systems, minimizing the energy scraps due to low-efficiency operating points.

关键词： Longitudinal Dynamics Mass Optimization Energy Efficiency Electric Powertrain Hydrogen Fuel cell

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