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

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Friction Coefficient of the PVD-AlCrN Coated Cemented Carbide and Hardened Steel Tribo-Pair Under Dry Sliding 5th

Friction Coefficient of the PVD-AlCrN Coated Cemented Carbid...

引用

5th International Tribology Symposium of IFToMM (ITS-IFToMM)

作者： Solasa, Krishna Chaitanya Venkataraman, N. V. Choudhury, Palash Roy Bhattacharyya, Abhijit Mahindra Univ Dept Chem Hyderabad 500043 India Mahindra Univ Dept Mech & Aerosp Engn Hyderabad 500043 India

ISBN: (纸本)9783031626180;9783031626166;9783031626159

Can a simple tribometric experiment be used to estimate the tool-chip interface friction coefficient in high speed cutting (HSC) to provide a preliminary assessment of the effect of using a new tool coating on the tool-chip interface friction? Heat generated in the machining zone is a primary factor that governs the performance of machining operations, and tool-chip frictional heating is a primary cause of heat generation. There is no method available yet which makes it practically possible to measure the tool-chip interface friction coefficient directly. Additionally, machining experiments are expensive. In the work reported here, frictional conditions resembling those at the tool chip interface are experimentally simulated on a rotary pin-on-disc tribometer to estimate the interface frictional coefficient. Based on such experiments, the effect of applying physical vapour deposited (PVD) thin film AlCrN coatings on cemented tungsten carbide tools for HSC of hardened steels is investigated. The possibility of applying results obtained from simpler, less expensive tribological experiments to machining operations is discussed.

关键词： coefficient of friction pin-on-disc high speed cutting thin film coating

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Influence of Thermodynamic on ECS Control in DLC Maneuver 5th

Influence of Thermodynamic on ECS Control in DLC Maneuver

引用

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

作者： Stefanelli, Andrea Carbone, Fabio Caresia, Pietro Di Stasio, Federico Pagano, Gianluca Ponticelli, Lorenzo Sakhnevych, Aleksandr Univ Naples Federico II Via Claudio 21 Naples Italy Brembo SpA Via Brembo 25 Curno Italy

ISBN: (纸本)9783031645716;9783031645693;9783031645686

The interaction between brakes and tires is crucial for the safety and performance of motor vehicles. This study aims to examine this interaction considering the thermodynamic evolution of tires and evaluating the differences in the dynamic behavior of the vehicle and then of the behavior of ESC (Electronic Stability Control). In particular, it focus on the detailed analysis of the "Double Lane Chang" maneuver once the thermodynamic evolution of the tires over time has been implemented. The results provide an important understanding of the braking and steering dynamics of vehicles, contributing to suggesting possible future developments to optimize safety and performance.

关键词： Vehicle Stability Tire Thermal Model DLC ESC

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Human-machine Driving Interface for Omnidirectional Robots and Wheelchairs 5th

Human-Machine Driving Interface for Omnidirectional Robots a...

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

作者： Tagliavini, Luigi Botta, Andrea Colucci, Giovanni Baglieri, Lorenzo Duretto, Simone Quaglia, Giuseppe Politecn Torino Dept Mech & Aerosp Engn Turin Italy

ISBN: (纸本)9783031645556;9783031645532;9783031645525

This paper presents the development of a drive-interface for omnidirectional motorized systems like carts, mobile robots, lifting devices and electric powered wheelchairs. The goal of this research is to design an intuitive and reliable drive interface that is safe to use and cost-effective. This paper presents the concept and functional design of the sensorized handlebar. Moreover, the first prototype of the device is presented and tested with a preliminary experimental setup.

关键词： Driving interface Force-based interface Electric-powered-wheelchairs Mobile robots Human-machine interface

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New Design of the Gripper and Its Orientation Algorithm for Placing Test Tubes and Racks with a Robotic System for Aliquoting Biomaterials 9th

New Design of the Gripper and Its Orientation Algorithm for ...

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9th European Conference on Mechanism science (EuCoMeS)

作者： Rybak, L. A. Cherkasov, V. V. Malyshev, D., I Diakonov, D. A. Carbone, G. Belgorod State Technol Univ Belgorod 308012 Russia Univ Calabria Dept Mech Energy & Management Engn I-87036 Arcavacata Di Rende Italy

ISBN: (纸本)9783031672972;9783031672958;9783031672941

The article considers a new design of a gripping device for gripping and moving racks with test tubes and test tubes by a robotic system for aliquoting biomaterial. Geometric parameters were determined and a 3-D model of the gripper was created, which was later made using a 3-D printer. To perform the test tube grasping operation, a new algorithm for determining the orientation angle of the grasping device is proposed. The structure of a robot control system with a gripper device using an Arduino microcontroller is developed. The results of testing the developed algorithm and gripper are presented, which confirmed the necessary accuracy of performing operations for grasping and moving objects.

关键词： Aliquoting system gripper object detection 3D design

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Experimental Wear Analysis on Mechanical Seals for Concrete Mixers 5th

Experimental Wear Analysis on Mechanical Seals for Concrete ...

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5th International Tribology Symposium of IFToMM (ITS-IFToMM)

作者： Logozzo, Silvia Valigi, Maria Cristina Univ Perugia Via G Duranti Perugia Italy

ISBN: (纸本)9783031626180;9783031626166;9783031626159

The paper presents an experimental wear analysis of amechanical face seal for twin-shaft concrete mixers. The studied mechanical seals are lubricated through a timed pump which delivers grease progressively and distributes the required amount of lubricant to each seal evenly. Seals aim at preventing the leakage of the dough from the tank of the concrete mixer through the gaps between the fixed and rotating parts. To prevent the dough from spilling out, the flow is contrasted by adding lubricating grease. The seals, after a certain period of operation, exhibit significant wear progress due to an interlayer of concrete/inert material. The experimental wear analysis is carried out with the aid of 3D scanners and from the observation of the results, three different phases are defined during the material removal, considering different wear behaviors. Results are also compared to wear volumes from gravimetric tests. Therefore, this paper lays the groundwork for a future model of the wear behaviour of mechanical face seals in twin-shaft concrete mixers and for proposing solutions to limit and control the wear phenomena.

关键词： Green Tribology Mechanical Face Seal Wear 3D Scanners Concrete Mixers

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Preliminary Configuration of a Robotic Arm for Pipeline Maintenance in the DTT Reactor 5th

Preliminary Configuration of a Robotic Arm for Pipeline Main...

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

作者： Calvo, Giulia Ferrauto, Martina Melchiorre, Matteo Reale, Andrea Sorli, Davide Troise, Mario Mauro, Stefano Politecn Torino Dept Mech & Aerosp Engn Turin Italy ENEA CRE Frascati Frascati Italy Politecn Torino Dept Management & Prod Engn Turin Italy

ISBN: (纸本)9783031645556;9783031645532;9783031645525

The maintenance of the DTT nuclear fusion reactor will be operated by a remote handling system which includes a number of specifically designed manipulators and robotic arms. This work aims to disclose the preliminary consideration for the design of a robotic system intended to handle pipes that must be periodically substituted in port 4 of the vacuum vessel. As the port appears as a narrow duct with a trapezoidal section, the arm must satisfy strict requirements in term of incumbrance and, at the same time, it must ensure the capability to remove and reposition the pipes which are displaced al around the perimeter of the section. The configuration is analyzed considering the geometrical constraints and the requirements for the workspace. The paper proposes a first design for the manipulator and shows the obtained workspace.

关键词： nuclear fusion power plant remote handling maintenance

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Kinematic Aspects and Geometric Modeling for the Legs of a Hexapod Robot Intended for Laboratory Experiments 6th

Kinematic Aspects and Geometric Modeling for the Legs of a H...

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6th Symposium on Mechanism Design for Robotics (MEDER)

作者： Nitulescu, Mircea Univ Craiova Dept Mechatron & Robot Craiova Romania

ISBN: (纸本)9783031673856;9783031673832;9783031673825

This paper focuses on several aspects that need to be considered for leg design of a hexapod robot model. Some fundamental, constructive, and functional elements are addressed. After the analysis of several possible structures the one considered optimal for the intended purpose was chosen, namely the creation of an experimental simple and economic model for hexapod robot locomotion studies. The direct and inverse kinematic equations are included for this chosen structure. Then, using the Matlab environment, many study cases are carried out on the operating space of the leg, highlighting the extreme points and essential sections from different angles of view. Finally, a set of geometric models is presented regarding the movement of the leg tip on a linear trajectory, in different imposed situations and with highlighting of tracking errors.

关键词： Leg Structure Kinematics Modelling

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Viscoelastic Circular Contact Mechanics: A Boundary Element Formulation 5th

Viscoelastic Circular Contact Mechanics: A Boundary Element ...

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5th International Tribology Symposium of IFToMM (ITS-IFToMM)

作者： Santeramo, Michele Putignano, Carmine Krenn, Stefan Vorlaufer, Georg Carbone, Giuseppe Politecn Bari Dept Mech Math & Management Via Orabona 4 I-70100 Bari Italy CNR Inst Photon & Nanotechnol UOS Bari Phys Dept M Via Amendola 173 I-70126 Bari Italy AC2T Res GmbH Viktor Kaplan Str 2-C A-2700 Wiener Neustadt Austria

ISBN: (纸本)9783031626180;9783031626166;9783031626159

In this paper, a Boundary Element methodology is presented to assess viscoelastic circular contacts in steady-state conditions, when the interacting pair shows both a low and a high level of conformity. The approach is fully general, able to deal with any real viscoelastic material, with a continuous spectrum of relaxation times, and it is based on the definition of an ad-hoc derived Green's function, which captures the circular feature of the domain. At first, the conformal contact between a rigid cylindrical punch and a holed linear viscoelastic space is studied, and the viscoelastic contribution to the overall friction is analyzed;then the BE methodology is deployed to investigate the response of a polymer roller bearing operating in steady-state conditions. The assessment of such a problem is fundamental from an industrial point of view, as we show that, differently to the purely elastic case, some of the rollers in the load zone may lose contact with the raceways at certain angular speeds: this circumstance may lead to dramatic changes of the bearing capacity and, in turn, to severe consequences on the system operation.

关键词： Bearings Boundary Element Method Friction Viscoelasticity

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Modelling Cavitation in Viscoelastic Thin Lubricating Films 5th

Modelling Cavitation in Viscoelastic Thin Lubricating Films

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5th International Tribology Symposium of IFToMM (ITS-IFToMM)

作者： Ahmed, Humayun Biancofiore, Luca Bilkent Univ Dept Mech Engn TR-06800 Ankara Turkiye Univ Aquila Dept Ind Engn Informat & Econ Piazzale Ernesto Pontieri I-67100 Laquila Italy

ISBN: (纸本)9783031626180;9783031626166;9783031626159

Lubrication via polymer enhanced oils helps prevent excessive energy and material losses in mechanical components such as bearings and gears. The addition of these polymers presents strong non-Newtonian characteristics in the lubricating film, such as shear thinning and viscoelasticity that must be taken into account at high contact load and surface sliding speeds. In this work, we utilize computational methods to model the pressure distribution, governing the maximum load carrying capacity, in a hydrodynamically lubricated contact in which (i) the lubricant viscoelasticity cannot be neglected and the (ii) lubricant film can present a gaseos (or vaporous)-liquid mixture region due to a drop in the film pressure below the cavitation pressure. For this we employ the viscoelastic Reynolds equation (Ahmed & Biancofiore, Journal of Non-Newtonian Fluid Mechanics, 292, 104524, 2021.), (i) modified appropriately to account for lubricant phase change, and (ii) adapted for the robust Fischer-Burmeister-Newton-Schur (FBNS) algorithm to model the cavitation appearance. We observe in several geometries, mimicking journal bearings and pocketed profiles, an improvement in the tribological performance (higher load and lower friction coefficient) as viscoelastic effects are strengthened.

关键词： viscoelasticity cavitation thin films

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Vision-Based Material Inspection for the Optimization of Robotized Construction 8th

Vision-Based Material Inspection for the Optimization of Rob...

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

作者： Jeziorek, Christoph Camiletti, Michela Huvers, Max Malkwitz, Alexander Bruckmann, Tobias Pfeil, Aileen Univ Duisburg Essen NRW Lehrstuhl Mechatron Lotharstr 1 D-47057 Duisburg Germany Univ Duisburg Essen Inst Baubetrieb & Baumanagement NRW Berliner Pl 6-8 D-45127 Essen Germany

ISBN: (纸本)9783031598906;9783031598883;9783031598876

In a project funded by the Ministry of Regional Identity, Local Government, Building and Digitalization of the State of North Rhine-Westphalia, automation in the construction industry is to be advanced. The goal is to realize essential parts of the shell based on a digital building model, using robot technology. After the realization of the automated masonry, the automatic creation of ceilings with cable-driven parallel robots shall be developed. An important step towards economic competitiveness is the increase in processing speed and quality. The optimization of the construction material gripping and the corresponding detection processes are crucial for cost-effective implementation. The approach proposed here utilizes machine vision methods to accelerate the automated shell creation, additionally enabling quality assurance. The paper reviews the state of quality assurance and machine vision methods in the context of automated building construction. It then outlines the approach to process improvements, describing a concept for image-based component recognition. The results demonstrate the potential benefits of incorporating machine vision into the cable robot system, discussing implications for efficiency and overall construction quality. The findings contribute to the ongoing efforts to integrate automation seamlessly into the construction industry.

关键词： machine vision Image recognition Cable-driven parallel robot Automated construction Quality inspection

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