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

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An Easy to Implement and Acceptable Accuracy VOF Based Boiling Phase Change Model 30th

An Easy to Implement and Acceptable Accuracy VOF Based Boili...

引用

30th International Conference on Computational and Experimental Engineering and sciences

作者： Chen, Guang Qi, Baojin Xi An Jiao Tong Univ Xian 710049 Peoples R China

ISBN: (纸本)9783031774911;9783031774898;9783031774881

Gas-liquid flow boiling shows great potential for heat dissipation applications. However, accurate numerical simulations of flow boiling remain a challenge due to the accuracy of predictions and the difficulty of implementing phase change models. This paper presents a boiling phase-change model that is easy to implement and provides acceptable accuracy based on the volume of fluid (VOF) method. The model drives phase changes primarily based on deviations of the interfacial temperature above the saturation temperature, and the model takes into account vapor and liquid thermal conductivities and grid size. Furthermore, the phase change model is restricted to implementation in interface or liquid cells directly adjacent to pure gas cells. Various theoretical problems with analytic solutions, such as the one-dimensional Stefan problem, the sucking problem, the two-phase Stefan problems, and the bubble growth in superheated liquid, are used to validate the accuracy of the model. The results show that the proposed boiling phase change model is well adapted and provides good accuracy for various problems.

关键词： CFD Volume of Fluid Boiling Phase-Change Model

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E-learning Platform for Information Technology in Business Management 12th

E-learning Platform for Information Technology in Business M...

引用

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

作者： Prajova, Vanessa Praj, Filip Kostal, Peter Homokyova, Maria Slovak Univ Technol Fac Mat Sci & Technol Trnava Trnava Slovakia

ISBN: (纸本)9783031805141;9783031805127;9783031805110

The development of information technology and digitalisation is now having a major impact on the overall development of the industry. Today's industrial enterprises are constantly striving to improve their processes and efficiency, and digitalisation and information technology can be key tools for achieving these goals. Information technology (IT) plays a very important role in industrial enterprises today. It enables businesses to adapt to rapid and rapid market changes and improve their competitiveness. Digitalisation brings many benefits to industry, which are reflected in increased efficiency, performance and innovation. One of the biggest benefits of digitisation is automation. Production lines are able to produce continuously 24 h a day without human intervention, increasing production capacity and reducing errors. Automation reduces errors in production and increases efficiency and output, helping businesses save costs and improve their profitability. Another benefit is improving the quality of products and services. Thanks to IT, the quality of data is improved, which helps in decision-making and planning. Digital data analysis enables businesses to identify weaknesses and improve processes, thereby increasing the quality of products and services. Last but not least, it is important to stress that information systems also help businesses in decision-making and planning. Analytical tools can process huge amounts of data, which are then used in decision-making and planning, thereby increasing efficiency and reducing the risk of errors. Nowadays, many businesses are trying to use information technology and information systems to their advantage. In particular, industrial enterprises often use information systems for production planning and management, as well as for monitoring product quality and tracking consumer trends.

关键词： E-learning Information technology Modules of enterprise information systems Business processes

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3D Printed Harmonic Drive for Legged Mobile Robots 33rd

3D Printed Harmonic Drive for Legged Mobile Robots

引用

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

作者： Buleandra, D. G. Baneasa, A. O. Donca, R. C. Tech Univ Cluj Napoca Mechatron & Machine Dynam Dept Cluj Napoca Romania

ISBN: (纸本)9783031592591;9783031592577;9783031592560

This paper will present the design and construction of a harmonic drive used in the actuation of a legged mobile robotic platform. The main advantage of this type of application is the minimal backlash, which is important for the precise positioning of the platform, also allowing high reduction ratios, in a compact form. The design also takes advantage of some of the latest additive manufacturing techniques, which have become easily accessible in the last few years. Most components are made from polymer materials, constructed using commercially available 3D printers.

关键词： Harmonic drive Additive manufacturing Legged robotics

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From Marker Trajectories to Muscular Activations: A Musculoskeletal Multibody Model Considering Compliant Tendon Behaviour 5th

From Marker Trajectories to Muscular Activations: A Musculos...

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

作者： Sicilia, Alessandro De Stefano, Marco Ruggiero, Alessandro Univ Salerno Dept Ind Engn Via Giovanni Paolo IINr 132 I-84084 Fisciano Italy

ISBN: (纸本)9783031626180;9783031626166;9783031626159

In this paper a recent development about the multibody modelling of musculoskeletal system is presented. The authors implemented two new routines in the already developed algorithm simulating the inverse dynamics of musculoskeletal systems able to elaborate the driving actions that lead the system to move with a known kinematics. The routines added to the algorithm were the inverse kinematics tool and the consideration of the tendon compliant behaviour: the first made the code able to elaborate the evolution of the system degrees of freedom starting from a set of marker trajectories, while the second allowed to consider the deformability of the tendons included in the muscle actuators. The upgraded model was tested on an upper limb musculoskeletal system available on the OpenSim (R) software and the results were shown and discussed, focusing on the comparison between the configurations of rigid/compliant tendon possibility. The positive outcomes and the adaptability of the developed code allowed the authors to consider the utilization of the algorithm in the framework of the biotribological assessment of artificial joint, like the total hip replacement implanted in the lower limb system.

关键词： Biomechanics Multibody Upper limb Inverse Dynamics

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Spiroid Gears vs. Bevel and Hypoid. Design Preconditions and Practice of Implementation 12th

Spiroid Gears vs. Bevel and Hypoid. Design Preconditions and...

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

作者： Trubachev, Evgeniy MIP Mech Ltd Goldfarb Kalashnikov ISTU 426069 Inst Mech Named Prof I Goldfarb Izhevsk 426035 Russia

ISBN: (纸本)9783031805141;9783031805127;9783031805110

The manuscript presents spiroid gears as a substitute for bevel and hypoid ones having relatively low gear ratios (3 - 8) for worm type gears. A qualitative and quantitative comparison of alternatives in accordance with their operation properties - load capacity, efficiency, meshing force - is given. It is concluded that the spiroid gear in this respect has at least not worse potential than traditional bevel and hypoid gears. A relatively easy-to-implement technology for the production of spiroid gears and its potential for improving machining performance and flexibility in small series multiproduct manufacturing and contact localization control are described. In particular, cheaper screw cutting and screw grinding machines, machining centers and hobbing machines can be used instead of expensive specialized gear cutting machines and tools for production of bevel and hypoid gears. A comparison of practically implemented alternatives is given. A good prospect of application of spiroid gears instead of bevel and hypoid ones in transportation and pipeline valve control engineering is noted.

关键词： Spiroid Gear Bevel Gear Hypoid Gear

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An Early Intelligent Detection Method for Well Leakage Based on the Adaptive Fusion of Multi-Drilling Parameter Trends 30th

An Early Intelligent Detection Method for Well Leakage Based...

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30th International Conference on Computational and Experimental Engineering and sciences

作者： Wang, Biao Li, Jun Yang, Hongwei Guo, Boyun Chen, Kangping Zhan, Jiahao Zhang, Geng Long, Zhenyu Chen, Wang China Univ Petr Coll Artificial Intelligence Beijing Peoples R China China Univ Petr Beijing Karamay Xinjiang Peoples R China Univ Louisiana Lafayette Lafayette LA USA Arizona State Univ Tempe AZ USA

ISBN: (纸本)9783031816758;9783031816734;9783031816727

Well leakage accidents occur frequently during drilling operations in ultra-deep oil and gas wells, which may lead to serious safety hazards if not detected promptly. Therefore, early intelligent detection of well leakage is critical to ensure drilling safety. To address the issues of the scarcity of well leakage data samples and the differences in the response patterns of drilling parameters under different drilling conditions, this study proposes an early intelligent detection method for well leakage based on the adaptive fusion of multi-drilling parameter trends. First, an intelligent recognition model for drilling conditions was built using the Random Forest algorithm (RF). Secondly, by eliminating the influence of drilling conditions on the feature parameters of well leakage and combining the trend values of multi-drilling parameters, an adaptive calculation method for the Leakage Risk Coefficient (LRC) is constructed. Finally, the effectiveness of this method was verified by testing on measured well leakage data. The research results show that the accuracy of the intelligent recognition model for drilling conditions reaches 97.9%, which can be used to optimize well leakage feature parameters. This method is less affected by changes in drilling conditions and parameters, making it applicable throughout the entire drilling process. It can issue an early warning signal for well leakage 16 min earlier than the mud pit gain method, providing valuable time to take appropriate measures.

关键词： Well leakage Early intelligent detection Drilling conditions Random forest algorithm Well leakage risk coefficient

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Instability of Vibrations in Complex Moving Objects with New Couplings 12th

Instability of Vibrations in Complex Moving Objects with New...

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

作者： Milic, Dunja Deng, Jian Stojanovic, Vladimir Petkovic, Marko D. Univ Nis Fac Mech Engn Nish Serbia Lakehead Univ Dept Civil Engn Thunder Bay ON Canada Univ Nis Fac Sci & Math Nish Serbia

ISBN: (纸本)9783031805141;9783031805127;9783031805110

This study delves into the stability of vibrations in a complex mechanical oscillator traversing an infinite continuous beam-foundation system. It focuses on discerning stability differences between two models: one with an adjustable vertical position connected to the car's body and another linked to the bogies. After determining stability limits for both models, it can be observed that connecting the stabilizer to the car body results in larger stability regions. In this scenario, significant changes to the stiffness and damping parameters can be made with minimal alteration to the stability region. In contrast, when the stabilizer is connected to the bogies, changes in the stiffness and damping parameters can have a more substantial impact and manipulation of the stability region but the stability regions are consistently smaller in all cases considered.

关键词： Dynamic stability D-decomposition method Principle of argument

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The Test Bench for Determining Impact of Polymer Housing Material on the Bearing's Internal Friction 12th

The Test Bench for Determining Impact of Polymer Housing Mat...

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

作者： Tasic, Marko M. Mitrovic, Radivoje M. Miskovic, Zarko Z. Acad Appl Studies Politehn Dept Zemun Belgrade Serbia Univ Belgrade Fac Mech Engn Belgrade Serbia

ISBN: (纸本)9783031805141;9783031805127;9783031805110

The test bench for research of the influence of housing material on internal friction of the idler bearing is presented in this paper. Different internal friction is the consequence of different temperature field caused by various housing materials and heat conductivity coefficients respectively. The test bench was created by the special modification of the existing pulley test bench in the laboratory LIMES. Several radial loads and rotational speeds were applied to the test bench. The results of temperature and internal resistance force were monitored and recorded for the whole period until both variables reached stationary stage.

关键词： Radial ball bearings Polymer housing Internal friction test bench

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Advantages and Limitations of Oil Film Thickness Capacitive Sensor Measurements in Balanced Vane Pumps 5th

Advantages and Limitations of Oil Film Thickness Capacitive ...

引用

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

作者： Natali, Caterina Stuppioni, Umberto Battarra, Mattia Blum, Alessandro Dalpiaz, Giorgio Mucchi, Emiliano Univ Ferrara Engn Dept Via G Saragat 1 I-44122 Ferrara Italy ZF Automot Italia Srl Ostellato Plant Via M Buonarroti 2 I-44020 San Giovanni Di Ostellat FE Italy

ISBN: (纸本)9783031626180;9783031626166;9783031626159

Research regarding the Oil Film Thickness (OFT) in balanced vane pumps is especially significant as they are characterized by both loss of contact and elasto-hydrodynamic lubrication condition of the vane tip, adverse to Noise-Vibration-Harshness and durability. Subsequently, a novel experimental approach for the OFT measurement between the stator and the vane tip by using capacitive sensors has been proposed in this study. The procedure employed to adapt the pump components to accommodate the sensor are described and the experimental operations are depicted. Furthermore, an original post-processing technique is described to determine the OFT magnitude, highlighting the related critical points.

关键词： Vane pump oil film thickness measurements capacitive sensor

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Overload Protection Table for Robotic Applications 14th

Overload Protection Table for Robotic Applications

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

作者： Zabka, Petr Dolezal, Jan Tech Univ Liberec Studentska 2 Liberec Czech Republic

ISBN: (纸本)9783031702532;9783031702518;9783031702501

In the paper, a safety device for a robotic workplace is proposed in the form of a table with overload protection. Until a collision occurs, the table and objects attached to it stay in a stable position. When a preset critical activation force is exceeded, the table becomes dislodged. For this purpose, a delta mechanism is used. Based on analysis, the optimal geometry of the mechanism is designed so that the activation force is as little dependent as possible on the direction of action. Compared to common approaches, where the force limitation mechanism is attached to the robot, the chosen design has the advantage that the robot's carrying capacity and dynamics are unaffected. Moreover, since the mechanism is stationary, it is possible to compensate for the influence of the gravitational force. As a result, it is thus possible to set the designed protection even for small collision forces. The proposed solution is not intended for human-robot interaction, and additional security measures, such as fencing, are necessary.

关键词： robotics robot safety delta mechanism

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