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

共 3195 条记录，以下是241-250 订阅

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Multibody Modeling for the Analysis of the Maneuverability of a Skid Steering 6-Wheeled Robot 5th

Multibody Modeling for the Analysis of the Maneuverability o...

引用

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

作者： Cosenza, Chiara Malfi, Pierangelo Nicolella, Armando Niola, Vincenzo Savino, Sergio Univ Naples Federico II Naples Italy

ISBN: (纸本)9783031645716;9783031645693;9783031645686

In this paper, the analysis of the maneuverability of a Skid Steering 6-Wheeled Robot has been addressed. Through kinematic considerations, two logics for assigning speed references of the wheels to improve turning capabilities are proposed. Such logics are compared to the differential drive logic, known in the literature, through a dynamic model. This multibody and multiphysics model has been used to understand how much the dynamics affect the planned trajectory for the three compared logics.

关键词： Rover Multibody model Rocker-bogie Skid-steering Maneuverability

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Ability Mining of Toe Manipulation Under Force Against Toe Flexion 5th

Ability Mining of Toe Manipulation Under Force Against Toe F...

引用

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

作者： Komori, Masaharu Watanabe, Toshiki Terakawa, Tatsuro Kyoto Univ Kyoto Japan

ISBN: (纸本)9783031645716;9783031645693;9783031645686

Ability mining is based on the concept that bymaking situations where people operate under conditions different from those of everyday life, new potentials and previously unnoticed abilities can be discovered. As an ability-mining study, an investigation was conducted on the ability to manipulate with toes. Experiments were conducted on cases where resistance force was applied to toe flexion movements, and the results showed that weak resistance to the first toe tended to result in better manipulation ability than no resistance. On the other hand, there was a tendency for the manipulation ability to decrease under resistance on the second toe.

关键词： Toe Manipulation Ability mining

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Study on the Collapsing Mechanism of an Oscillating Bubble Above a Porous Rigid Wall 30th

Study on the Collapsing Mechanism of an Oscillating Bubble A...

引用

30th International Conference on Computational and Experimental Engineering and sciences

作者： Liu, Niannian Wu, Chenglong Chen, Zhanlong Xiao, Senlin Sun Yat Sen Univ Sch Ocean Engn & Technol Zhuhai 519080 Peoples R China China Merchants Marine & Offshore Res Inst Co Ltd Shenzhen 518067 Peoples R China

ISBN: (纸本)9783031774911;9783031774898;9783031774881

In this study, a series of experiments on spark-generated bubble oscillating near a porous rigid wall are conducted to investigate the characteristics of non-spherical oscillation and corresponding jet dynamics of the bubble. A high-speed camera is used to record the bubble behavior and several pressure sensors are installed at various positions on the wall surface to measure pressures caused by the collapsing bubble. Additionally, the ALE method is adopted to simulate the complex bubble behaviors and analyze the distribution of the velocity and pressure field. Combining with the numerical and experimental method, effects of typical parameters containing hole radius (gamma(R)), distances between the holes (gamma(D)), and bubble-wall distance (gamma(H)), on the bubble collapse and resultant jet impacting loads are systemically discussed. The result is expected to give an in-depth understanding on the mechanism of the bubble interacting with a porous wall and perhaps also provide reference for the design of porous protective structure under underwater explosion.

关键词： Pulsating bubble Porous wall Jet dynamics

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Geometric Robot Calibration Using a Calibration Plate 33rd

Geometric Robot Calibration Using a Calibration Plate

引用

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

作者： Rameder, Bernhard Gattringer, Hubert Muller, Andreas Johannes Kepler Univ Linz Inst Robot Altenberger Str 69 A-4040 Linz Austria

ISBN: (纸本)9783031592591;9783031592577;9783031592560

In this paper a new method for geometric robot calibration is introduced, which uses a calibration plate with precisely known distances between its measuring points. The relative measurement between two points on the calibration plate is used to determine predefined error parameters of the system. In comparison to conventional measurement methods, like laser tracker or motion capture systems, the calibration plate provides a more mechanically robust and cheaper alternative, which is furthermore easier to transport due to its small size. The calibration method, the plate design, the mathematical description of the error system as well as the identification of the parameters are described in detail. For identifying the error parameters, the least squares method and a constrained optimization problem are used. The functionality of this method was demonstrated in experiments that led to promising results, correlated with one of a laser tracker calibration. The modeling and identification of the error parameters is done for a gantry machine, but is not restricted to that type of robot.

关键词： Geometric calibration Calibration plate Measuring points Gantry machine Experimental calibration results

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Simulating Crowd Vibration with Traffic Load 5th

Simulating Crowd Vibration with Traffic Load

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

作者： Cavacece, Massimo Figliolini, Giorgio Lanni, Chiara Univ Cassino & Southern Lazio Dept Civil & Mech Engn Cassino Italy

ISBN: (纸本)9783031645556;9783031645532;9783031645525

Streamlined sections in suspended structures can create dynamic responses that are particularly impactful. One notable source of noise and vibration is the weight of human footfall, which can be a nuisance for those using the facility. The objective is to ensure that the structure can withstand the stresses caused by the occupants. The approaches can be the following methods: (i) an analytical approach, which involves calculating the structure's performance during the design phase, and (ii) an experimental approach, which entails measuring the vibrations of the structure during use. This study proposes an experimental modal analysis procedure for evaluating the vibration functionality of an existing structure under the influence of excitation caused by human activity.

关键词： Modal analysis

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Investigation of Pellet machine with Fixed Roller Axle and Flat Rotating Die 12th

Investigation of Pellet Machine with Fixed Roller Axle and F...

引用

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

作者： Matejic, Milos Ivanovic, Lozica Matejic, Marija Zivic, Jovana Joksic, Snezana Univ Kragujevac Fac Engn Kragujevac Serbia Univ Pristina Fac Tech Sci Kosovska Mitrovica Serbia

ISBN: (纸本)9783031805141;9783031805127;9783031805110

Investigation of efficient biomass exploitation presents a very interesting topic nowadays, because of possible energetic crises, unstable energy market, energy independence, increasing usage of livestock etc. Genetic improvements are placing constant pressure on feed manufacturers to produce quality feeds that match the increased requirements of improved breeds. Biomass is one of the main sources for animal feed because it is commonly used and compressed as pellets. In this paper, the pelletizing machine for households will be presented. For the purposes of investigation, the pelletizing machine has been made firstly in CAD software, and then the real working model is completed. The machine functionality testing has been conducted, and pellets from the various materials are shown. In the conclusions, the weak points and strong points of the pellet machine are highlighted and further research direction is proposed.

关键词： Pellet Pellet machine Biomass Renewable Energy

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Opening an Industrial Robot Controller: Advanced Commercial Robotics Applications, Rapid Prototyping and Fast Research to Industry Technology Transfer 5th

Opening an Industrial Robot Controller: Advanced Commercial ...

引用

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

作者： Abba, Fabio Morra, Damiano Ferrara, Valentina Piscioneri, Alessandro Parlato, Giuseppe Perna, Valerio Adv Automat Solut Comau SPA Grugliasco Italy

ISBN: (纸本)9783031645556;9783031645532;9783031645525

In the development process of advanced robotics applications arises the need for an open platform able to enable the developers to rapidly test their algorithms on the robot, while keeping every other safe functionality active, and perform as ground base for commercial products with advanced capabilities. To address this task Comau has developed the Open Controller, a complete robotic system inside which a fast real time software layer is used to connect a development unit with the on-board robot computer. The effectiveness of the proposed approach has been proven in numerous partner installments.

关键词： robotics open industrial advanced sensor-based

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A Preliminary Study on 3D Tracking of an Untethered Microrobot 6th

A Preliminary Study on 3D Tracking of an Untethered Microrob...

引用

6th Symposium on Mechanism Design for Robotics (MEDER)

作者： Uslu, Tugrul Gezgin, Erkin Izmir Katip Celebi Univ Dept Mech Engn Izmir Turkiye Izmir Katip Celebi Univ Dept Mechatron Engn Izmir Turkiye

ISBN: (纸本)9783031673856;9783031673832;9783031673825

Thanks to recent advances in medical robotics, various traditional surgical procedures have been started to be carried out by the help of robot manipulators. Robot assisted techniques have increased efficiency of minimally invasive surgery methodologies such as endoscopic surgery and success in these tethered approaches have helped rapid spread of robot assisted methodologies in current related literature. On the other hand, advantages of these minimally invasive catheter based techniques vanish as the target area becomes smaller, narrower and critical to interfere within a limited workspace via tethered tools. In order to solve these aforementioned limitations, studies of untethered microrobotics in medicine have started to increase. In this study, a mean of tracking a microrobot within a blackbox environment is developed. Microrobot tracking is performed by applying machine learning methodology on hall effect data collected from an array of hall effect sensors and position data collected from a commercial optical tracking system. Predictions of developed microrobot tracking method are investigated.

关键词： medical robotics untethered microrobot motion capture machine learning

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A Novel Method to Identify Right and Left Impact During Running Using a Single Sacrum-Mounted IMU 8th

A Novel Method to Identify Right and Left Impact During Runn...

引用

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

作者： Chebbi, Aida Robinson, Rachel Donahue, Seth Hahn, Mike Univ Oregon Eugene OR 97403 USA Northwestern Univ Chicago IL 60611 USA

ISBN: (纸本)9783031598906;9783031598883;9783031598876

This study introduces a novel method for gait analysis using a single Inertial Measurement Unit (IMU) placed on the sacrum. his method is valid not only on level ground but also on incline and decline conditions. The method leverages the 'crackle' function, the third derivative of the sacral resultant acceleration, to identify right and left gait events. This approach is particularly effective in capturing the initial peak in acceleration data during foot impact with the ground, often overlooked by other methods. The study aims to demonstrate the method's accuracy in identifying right and left side impacts during level ground, incline and decline runs across a range of speeds. The results are compared with other existing methods to highlight its effectiveness.

关键词： Inertial measurement units Running monitoring Initial contact Toe off Angular velocity Crackle

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Finite Element Model Updating Applied to a Lower Limb Prosthesis Through the Optimisation of Its Mechanical Properties 5th

Finite Element Model Updating Applied to a Lower Limb Prosth...

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

作者： Barattini, Claudia Dimauro, Luca Vella, Angelo Domenico Vigliani, Alessandro Politecn Torino Dept Mech & Aerosp Engn Corso Duca Abruzzi 24 I-10129 Turin Italy

ISBN: (纸本)9783031645716;9783031645693;9783031645686

In the context of elite sports for lower limb amputees, the use of advanced materials and pioneering designs has enhanced athletes' performance by improving the energy storage and return capability of prosthesis feet. The knowledge of the behaviour of these components is crucial to meet athletes' requirements and needs. Given their inherent anisotropic nature, the modelling of these components entails fine-tuning several parameters, i.e., Young moduli, Poisson ratios and shear moduli along three directions. This research aims to develop an automated algorithm, implemented in Matlab, for the automated fitting of the material properties. An experimental modal analysis in free-free conditions has been conducted on the blade prosthetic to extract natural frequencies and mode shapes. Subsequently, in the optimisation code, modal simulations are performed on a finite element model, using Nastran. The optimisation procedure is based on the comparison to the experimental data previously evaluated. The optimisation outcomes, in terms of material properties, enable the development of a numerical model capable of predicting the experimental dynamic behaviour up to 400 Hz.

关键词： Running specific blade prosthetic Automated code Experimental modal analysis Nastran simulations Orthotropic material

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