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

共 3195 条记录，以下是341-350 订阅

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A Comparison Between Different Hybrid Electric Propulsion System Configurations by Means of Vibrational Analysis and Fuel Consumption 5th

A Comparison Between Different Hybrid Electric Propulsion Sy...

引用

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

作者： Niola, Vincenzo Fornaro, Enrico Spirto, Mario Malfi, Pierangelo Melluso, Francesco Univ Naples Federico II Dept Ind Engn Via Claudio 21 I-80125 Naples Italy

ISBN: (纸本)9783031645556;9783031645532;9783031645525

In this paper, an electric hybrid propulsion system, consisting of an internal combustion engine and an electric machine, for aeronautical applications, was studied, considering both vibrational characteristics and fuel consumption. Vibrational signals were analyzed in both time and frequency domains, revealing that hybrid configurations, at the same operating point compared to the configuration with only internal combustion engine, led to a reduction in vibration amplitudes. However, when analyzing the internal combustion engine fuel consumption, this result was not replicated for both configurations.

关键词： Hybrid Propulsion System Vibration Analysis Range FFT Fuel Consumption

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Utilization of Kinematic Synthesis Methodology on a Novel Polycentric Mechanism for Transfemoral Knee Prosthesis 6th

Utilization of Kinematic Synthesis Methodology on a Novel Po...

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6th Symposium on Mechanism Design for Robotics (MEDER)

作者： Kocak, Mertcan Gezgin, Erkin Izmir Katip Celebi Univ Dept Mechatron Engn Izmir Turkiye

ISBN: (纸本)9783031673856;9783031673832;9783031673825

Due to the escalating population of lower extremity amputee in worldwide, it is still required to improve prosthesis designs to be able to fulfill the demands in terms of quality and accessibility. Throughout the literature there exists valuable works to fulfill the mentioned requirements and many in progress since infinite number of mechanisms can be revealed to accomplish the duty by using optimization techniques, analytical approaches etc. In order to introduce a novelty through this scientific area, in the current work, it is utilized an analytical kinematic design procedure of a single degree of freedom polycentric mechanism to be used as a transfemoral prosthesis that can meet individual requirements for stance and swing phases. With the necessity of higher degree of freedom task, analytical approach to design a combined mechanism that have ability to guarantee stability in stance phase, and easy bending with offering biomimetic functionality in swing phase. Two individual designs for the stance and swing phases are presented modularly by utilizing kinematic synthesis procedures and it is aimed to combine them with a common goal.

关键词： Transfemoral Amputation Polycentric Mechanism Kinematic Synthesis

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Design and Prototyping of a Hand Exoskeleton for Finger Rehabilitation by Driving Distal Phalanx 6th

Design and Prototyping of a Hand Exoskeleton for Finger Reha...

引用

6th Symposium on Mechanism Design for Robotics (MEDER)

作者： Jiang, Ming Cao, Lei Meng, Qizhi Parenti-Castelli, Vincenzo Sugahara, Yusuke Takeda, Yukio Tokyo Inst Technol Dept Mech Engn Tokyo Japan Univ Bologna Dept Ind Engn Bologna Italy

ISBN: (纸本)9783031673856;9783031673832;9783031673825

Finger rehabilitation is crucial for recovery after a stroke. This study introduces a hand exoskeleton actuating on the distal phalanx of the finger. It enables flexion/extension and abduction/adduction movements for finger rehabilitation. This paper details the design process of the proposed hand exoskeleton including the mechanism design and kinematic analysis. Based on the optimized position of the actuating point, the parameters of the proposed mechanism were determined, and the prototype was fabricated accordingly. The motion ranges of the hand exoskeleton were partly confirmed with experiments.

关键词： Finger Rehabilitation Hand Exoskeleton Mechanism Design Kinematic Analysis Performance Evaluation Optimization

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Method for Determining the Influence of Surface Treatments on the Tribological Properties of Bodies in Rolling Contact 14th

Method for Determining the Influence of Surface Treatments o...

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

作者： Ondrasek, Jiri VUTS As Svarovska 619 Liberec 46001 Czech Republic

ISBN: (纸本)9783031702532;9783031702518;9783031702501

This paper presents an experimental method to assess the impact of surface treatment on the contact surfaces of bodies during pure rolling. The focus is on the number of cycles until mechanical damage occurs and rolling resistance. The tribological properties in the rolling contact of two bodies can be enhanced by applying a suitable surface treatment to the contact surface of one of the bodies that constitute the rolling pair or the general kinematic pair. For the purpose of testing, the samples contact surface was provided to a mechanochemical surface treatment known as Triboconditioning (R) CG developed by Tribonex AB. Mechanochemical surface treatments have been demonstrated to reduce friction and wear of components in sliding contact, particularly undermixed lubrication conditions. However, they have not yet been considered for optimizing the rolling resistance of roller bearings. This paper documents for the first time the effect of surface conditioning on lifetime and efficiency under typical loading conditions. The experiments aim to determine the number of cycles until the contact surface is damaged and the power consumption of the test device, depending on the contact area treated with the appropriate surface treatment in comparison to an untreated surface. The principle of the tests consists of the rolling of the cylindrical specimen between three loading discs. One of these discs is driven by an electric motor, which also applies a loading force.

关键词： Rolling kinematic pair Rolling resistance Treatment TCG

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Joint Path Planning of the Quasi-Spherical Parallel Manipulator 5th

Joint Path Planning of the Quasi-Spherical Parallel Manipula...

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

作者： Quinones, Daniel Pacheco Maffiodo, Daniela Laribi, Med Amine Politecn Torino Turin Italy Univ Poitiers Poitiers France

ISBN: (纸本)9783031645556;9783031645532;9783031645525

This paper focuses on the quasi-Spherical Parallel Manipulator (qSPM), a master device for bilateral teleoperation for telesurgery. Conceived as a haptic device for remote center of motion operation, the qSPM control architecture has been designed to implement auxiliary features, such as a reset function that automatically positions the end effector to the workspace center. Being the reachable workspace inside the joint space non-convex, path planning is non-trivial. This paper proposes a segmented point-to-point joint trajectory planning method. The developed algorithm, conceived with due simplifications to decrease computation effort, is able to avoid any critical point within the operative workspace.

关键词： Parallel Manipulators Spherical Manipulators Haptic Devices Path planning Point-to-Point Trajectory

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Globoidal Cam - Manufacturing Coordinates on 5-axis machine 14th

Globoidal Cam - Manufacturing Coordinates on 5-axis Machine

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

作者： Bilkovsky, Ales VUTS Svarovska 619 Liberec Czech Republic

ISBN: (纸本)9783031702532;9783031702518;9783031702501

This contribution describe the process of calculation of manufacturing coordinates for a globoidal cam. A design of a cam is dependent on selected mechanism, selected displacement law and condition of external forces. The basic production coordinates of globoidal cams are two rotation. The conventional machines do not easy set up the correct geometry and possibility to transform this coordinates are limited. The solution calculates the coordinates for 5-axis machine by basic transform matrixes.

关键词： Cam Globoid Production machine Transform Matrix

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Continuous-Time Robust Control for Cancer Treatment Robots 33rd

Continuous-Time Robust Control for Cancer Treatment Robots

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

作者： Mihaly, Vlad Birlescu, Iosif Susca, Mircea Chablat, Damien Dobra, Petru Tech Univ Cluj Napoca Dept Automat Cluj Napoca Romania Tech Univ Cluj Napoca CESTER Cluj Napoca Romania Nantes Univ LS2N CNRS Ecole Cent Nantes Nantes France

ISBN: (纸本)9783031592591;9783031592577;9783031592560

The control system in surgical robots must ensure patient safety and real time control. As such, all the uncertainties which could appear should be considered into an extended model of the plant. After such an uncertain plant is formed, an adequate controller which ensures a minimum set of performances for each situation should be computed. As such, the continuous-time robust control paradigm is suitable for such scenarios. However, the problem is generally solved only for linear and time invariant plants. The main focus of the current paper is to include m-link serial surgical robots into Robust Control Framework by considering all nonlinearities as uncertainties. Moreover, the paper studies an incipient problem of numerical implementation of such control structures.

关键词： Robust control Nonlinear systems Cancer treatment robots

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Proposal and Modeling by Simscape Multibody of a Mechatronic Device for Breast Cancer Cells Experiments 5th

Proposal and Modeling by Simscape Multibody of a Mechatronic...

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

作者： Angelella, Sebastiano Albi, Elisabetta Dionigi, Marco Logozzo, Silvia Valigi, Maria Cristina Univ Perugia Dept Engn Perugia Italy Univ Perugia Dept Pharmaceut Sci Perugia Italy

ISBN: (纸本)9783031645716;9783031645693;9783031645686

The paper is focused on a new device proposal to automate a laboratory process and observe the behavior of breast cancer cells when they are placed on Petri dishes. The experiment samples are observed during the pouring of a culture fluid on the cells to feed them with the subsequent clean-up operation from the waste products. This process is normally done manually with an operator who feeds and empties the Petri dishes. The proposed prototype allows to automatically perform experiments with a first phase where the cells are fed and a second phase where the waste generated by the cells is eliminated using a fluidic system. Since breast cancer cells show a three-dimensional growth, their observation must be performed by placing the Petri dishes in a clinostat. Therefore, the designed prototype is conceived to be placed on a clinostat to perform experiments that allow to follow the three-dimensional growth of the cells while they are fed and cleaned by waste. The fluidic device is modeled by Simscape Multibody, as a preliminary study where the simulations show some results in terms of feeding/emptying times that will be useful for setting the working conditions and operations of the device.

关键词： Breast cancer cells Mechatronic device for cell culture Automatic cell feeding Multibody simulation Simscape

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Estimation of Lateral Wheel-Rail Contact Forces and Track Irregularities Through a Nonlinear Constrained Estimator 5th

Estimation of Lateral Wheel-Rail Contact Forces and Track Ir...

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

作者： Marotta, Raffaele De Matteis, Luca Univ Naples Federico II Naples Italy

ISBN: (纸本)9783031645716;9783031645693;9783031645686

The running safety of railway vehicles depends on the real-time knowledge of wheel-rail contact interactions. The nonlinear nature of the latter, coupled with the random wear statuses of railway tracks, make difficult their direct measurement. Dedicated sensors are needed, but noise from wheel-rail contact harshness can corrupt measurements. A nonlinear state observer based on a Constrained Unscented Kalman Filter, which allows for constraining the estimated railway vehicle states and parameters, is proposed in the present work to estimate lateral wheel-rail contact forces and moments and identify lateral track irregularities. The developed technique can be applied for monitoring continuously the track conditions through in-service railway vehicles, enhancing control system effectiveness by estimating wheel-rail contact interactions based on measurements provided by onboard sensors.

关键词： railway vehicle Kalman filter track irregularity

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Mobile Exploration Robot with Hybrid Locomotion System 33rd

Mobile Exploration Robot with Hybrid Locomotion System

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

作者： Banabic, Antonio Ioan Tatar, Mihai Olimpiu Tech Univ Cluj Napoca Memorandumului 28 Cluj Napoca 400114 Romania

ISBN: (纸本)9783031592591;9783031592577;9783031592560

The authors of this paper present an innovation in mobile robot modelling utilising a hybrid locomotion technology. The advantages of both wheeled and walking mobility are combined in the proposed locomotion system. The four-bar mechanism of the robot leg allows for improved stability and stiffness of the entire locomotion system without obstructing any of the three modes of mobility-on wheels, with legs, or combined. The paper describes the conceptual model, the structural scheme of the robot and analyses the possibilities of locomotion using wheels and legs.

关键词： Hybrid Mobile robot Locomotion

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