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检索条件"丛书名=Lecture Notes in Mechanical Engineering"

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Development of a Production Planning and Control Method Through Productivity Analysis of Bottlenecks 32nd

Development of a Production Planning and Control Method Thro...

引用

32nd International Conference on Flexible Automation and Intelligent Manufacturing

作者： Laranjeira, Luis Avila, Liliana Univ Aveiro Dept Econ Management Ind Engn & Tourism Res Unit Governance Competitiveness & Publ Polici Aveiro Portugal

ISBN: (纸本)9783031381645;9783031381652

This paper describes the development of a Production Planning and Control (PPC) method implemented in a company that produces shower screens, to respond to problems associated with overproduction. In this system, the daily workload is directly influenced by the productivity presented in the bottleneck. The bottleneck was identified, a database was built to support the calculation of the bottleneck' productivity and the determination of the workload for each day. It is foreseeable that the system will bring considerable improvements in the productivity values. The data collected before and after the implementation of PPC system allowed identifying an increasing trend in the productivity values of the bottleneck resulting from the implementation.

关键词： PPC Productivity Workload Bottleneck

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Development of a Friction Welding System for CNC Lathes 1

引用

33rd International Conference on Flexible Automation and Intelligent Manufacturing

作者： Vosniakos, G-C. Karavolos, S. Tzimas, E. Begiazis, N. Kleftogiannis, A. Galanos, P. Chodnicki, M. Pierron, E. Natl Tech Univ Athens Sch Mech Engn Heroon Polytehniou 9 Athens 15773 Greece Gdansk Univ Technol Narutowicza Str 11-12 PL-80233 Gdansk Poland ENSMM 26 Rue Epitaphe F-25030 Besancon France

ISBN: (数字)9783031744853

ISBN: (纸本)9783031744846;9783031744853

Dedicated friction welding machines are sturdy in order to handle large process forces but expensive. Thus, it is proposed to equip two axis CNC lathes with an add-on direct drive friction welding system as an affordable solution for occasional use. The first part to be welded is clamped on the lathe chuck, whilst the second part is clamped on a dedicated chuck on the tailstock. The latter is programmed to follow three phases: fast approach, friction and forging under constant axial force. The tailstock is moved linearly by a servo motor and controlled by a Programmable Logic Controller with force sensor feedback. The main process parameters are pressure and duration of friction and forging phases. A neural network has been set up based on data from research literature providing the respective parameter values to enter in the operator interface. Preliminary welding tests conducted on PVC and aluminum parts resulted in moderately acceptable mechanical properties and some material discontinuities pointing to a need for automatically identifying optimal processing parameters.

关键词： Friction welding CNC lathe Machine tool control Neural net

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Heat, Air, and Moisture Transfer Model in Porous Building Materials with Consideration of Hygric Non-equilibrium Between Liquid Water and Vapor 14th

Heat, Air, and Moisture Transfer Model in Porous Building Ma...

引用

14th International Conference on Computational Heat and Mass Transfer (ICCHMT)

作者： Wasik, Michal Lapka, Piotr Warsaw Univ Technol Fac Power & Aeronaut Engn Inst Heat Engn Nowowiejska St 21-25 PL-00665 Warsaw Poland

ISBN: (纸本)9783031666087;9783031666094

The paper presents a model for drying building materials or masonry walls. The mixture approach was used to model transport phenomena in a porous medium. Therefore, effective properties were used instead of modeling the exact microstructure. The model considered three phases, i.e., solid material (matrix), liquid water, and humid air (a mixture of vapor and dry air). Liquid water capillary and diffusive vapor and air transfer were accounted for. Thermal equilibrium between all phases (the same temperature of all components) was assumed. However, the hygric non-equilibrium between the liquid water and vapor was considered. Hence, moisture phase transition with a finite rate could be modeled. The model was implemented in the commercial software ANSYS Fluent by using advanced customization user interfaces, i.e., User-Defined Function (UDF), Scalar (UDS), and Memory (UDM), which allowed extending the capability of the software to phenomena models that are not available in the software. The model was tested and subsequently validated against the experiment. The experimental stand was explicitly designed for comparing simulations with measurements. The experiment was conducted in forced convection conditions at the surface of the damp material. The validation shows limited agreement of the model predictions with the measurements.

关键词： Porous Building Materials Drying Non-equilibrium Model Moisture Transfer

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A High Frequency Wheel/Rail Contact Model for Curve Squeal in Time Domain Using Impulse Response Function Method 14th

A High Frequency Wheel/Rail Contact Model for Curve Squeal i...

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14th International Workshop on Railway Noise (IWRN)

作者： Yang, Xinwen Liu, Shutong Wang, Jin Tongji Univ Shanghai Key Lab Rail Infrastruct Durabil & Syst Shanghai 201804 Peoples R China Tongji Univ Key Lab Rd & Traff Engn Minist Educ Shanghai 201804 Peoples R China

ISBN: (纸本)9789819978519;9789819978526

A time-domain model for high frequency wheel-rail interaction considering the effect of flexible wheel and track is developed, the wheel-rail contact coupling between normal and tangential dynamics. Firstly, the impulse response functions of the wheel-rail structure are solved by using modal superposition method, and the wheel/rail flexible vibration responses are calculated by using the convolution with the wheel-rail contact force and the impulse response function that are calculated in advance. Then high frequency wheel-rail normal and tangential interaction forces are calculated and shown in the time domain with revised non-Hertzian contact theory, in which the effects of wheel-rail stick-slip oscillation in contact patch are considered.

关键词： Urban rail transit Wheel/rail contact Curve squeal Impulse response function

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Design of Explicit and Lateral-Longitudinal Integrated Motion Controller with Safety Guarantee for Autonomous Vehicles 16th

Design of Explicit and Lateral-Longitudinal Integrated Motio...

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16th International Symposium on Advanced Vehicle Control

作者： Gao, Haoyu Liu, Chang Ping, Yingxi Yang, Sen Jiang, Beiyan Li, Shengbo Eben Tsinghua Univ Beijing 100084 Peoples R China Peking Univ Beijing 100871 Peoples R China Beijing Union Univ Beijing 100101 Peoples R China

ISBN: (纸本)9783031703942;9783031703928;9783031703911

Model predictive control (MPC) is an effective method in lateral-longitudinal integrated control with safety guarantee for autonomous vehicles. But its computational burden is significant, making it challenging to meet real-time requirements. The contribution of this paper is to propose an explicitly solvable autonomous vehicle motion controller with lateral-longitudinal integrated characteristics and safety guarantee, achieved by integrating input-output controllers from exponential control Lyapunov function (ECLF) and exponential control barrier function (ECBF). We performed simulations using a high-fidelity dynamics model in CarSim for simple urban traffic scenarios. The simulation results demonstrate that our designed controller has good trajectory tracking performance, safety guarantee, low computational burden and a certain level of robustness.

关键词： autonomous vehicles motion control lateral-longitudinal integration safety guarantee explicit nonlinear system high-order

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Conceptual Design Approach for an Ergonomically Fit Workstation to Minimize Discomforts During Welding Operations 1

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33rd International Conference on Flexible Automation and Intelligent Manufacturing

作者： Nedohe, Khumbuzile Makinde, Olasumbo Ramatsetse, Boitumelo Univ Johannesburg ZA-2028 Johannesburg South Africa Stellenbosch Univ ZA-7602 Stellenbosch South Africa

ISBN: (数字)9783031744853

ISBN: (纸本)9783031744846;9783031744853

The welding operation is a vital process of product assembly that exposes workers to discomforts owing to working in awkward positions, repetitive tasks, and manual material handling. This ergonomically unfit welding working conditions exposes workers to musculoskeletal disorders, which could result into workers illness. In light of this, this paper proposes a suitable ergonomically fit workstation for performing manual welding operations in a manufacturing environment. To address this, preliminary studies were conducted on an existing welding workstation with a view to identifying awkward body postures that could result into musculoskeletal disorders. The result of this exercise unveiled three alternative workstation design concepts that has the potential of addressing these ergonomic issues. The three (3) workstation design concepts were evaluated using theWeighted Decision Matrix approach based on design criteria such as degree of adjustability, maintenance cost, comfortability, ease of operation and safety. The result of the decision analysis exercise revealed that workstation design concept 2, with a performance score of 1.54 and design features such as vertical and tilting adjustable tabular system geometry fitted with wheels for mobility, and a back support adjustable chair, furnished with a rotating pad to influence the forward backward movement is the suitable ergonomically fit workstation that should be used to perform manual welding operations in a manufacturing environment.

关键词： Workstation Ergonomics Welding Operation Posture Musculoskeletal Disorder

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Simulation Study on X-Ray Radiographic Testing of Welds

Simulation Study on X-Ray Radiographic Testing of Welds

引用

Saudi International Conference on Nuclear Power engineering (SCOPE)

作者： Mousa, Tariq Taha, Eslam Alnadwi, Fuad Siddig, Mohammed Banoqitah, Essam King Abdulaziz Univ Nucl Engn Dept Jeddah 21589 Saudi Arabia King Abdulaziz Univ Ctr Training & Radiat Protect Jeddah 21589 Saudi Arabia VTT Tech Res Ctr Finland Nucl Energy Res Area Espoo Finland

ISBN: (纸本)9783031643613;9783031643620

Despite the acknowledged advantages that computer simulations can offer to Radiographic Testing, simulation solutions are uncommon in the industry. This paper presents an effective strategy for the simulation of Radiographic Testing techniques using Geant4 Application for Tomographic Emission (GATE), which is a medical imaging software toolkit. Models forX-ray emission, test specimen geometry, radiation interaction with the test specimen, and image receptors were created in GATE. Single Wall Single Image and Double Wall Single Image techniques were set up to evaluate the simulation models. The results showed that GATE can afford a reliable and cost-effective solution in the simulation of radiographic Non-Destructive Testing procedures.

关键词： Non-Destructive Testing Radiographic Testing simulation Geant4 GATE

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Predicting and Optimizing the mechanical Effects Generated by a Laser-Treated Turbine Blade Using Artificial Neural Networks and ANFIS Techniques 10th

Predicting and Optimizing the Mechanical Effects Generated b...

引用

10th International Conference on Design and Modeling of mechanical Systems (CMSM)

作者： Ayeb, Manel Turki, Mourad Frija, Mounir Fathallah, Raouf Univ Sousse Inst Appl Sci & Technol Sousse ISSATSo Sousse Tunisia Univ Sfax Natl Engn Sch Sfax ENIS Unit Mech & Mat Prod Engn UGPMM UR17ES43 Sfax Tunisia Higher Inst Technol Studies Mahdia ISETMA Hiboun Tunisia Univ Monastir Natl Engn Sch Monastir ENIM Res Lab Automat Elect Syst & Environm LAS2E Monastir Tunisia Univ Sousse Natl Engn Sch Sousse ENISo Sousse Tunisia

ISBN: (纸本)9783031650062;9783031650079

This article discusses the application of artificial neural networks (ANNs) and adaptive neuro-fuzzy inference systems (ANFIS) to the prediction and optimization of mechanical effects resulting from laser shock processing (LSP) applied to turbine blades made of Inconel 718. LSP treatment is used in the aerospace industry to improve the durability and performance of turbine blades. The use of ANNs and ANFIS offers a data-driven approach to modeling and optimizing the mechanical properties of these treated blades. The development of predictive models that take into account various parameters such as: maximum applied pressure, full-width at half maximum and dimension is explored. In addition, this paper discusses optimization of LP process that harness the power of ANNs and ANFIS to maximize the desired mechanical properties, thereby contributing to the advancement of turbine blade technology in aerospace applications.

关键词： Laser shock peening Finite element method Residual Stress Plastic Strain Johnson-Cook Damage Inconel 718 Artificial Neural Networks (ANNs) Adaptive Neuro-Fuzzy Inference (ANFIS)

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Analysis and Improvement of the Maintenance Activity in the Molding Process of a Company in the Cork Industry 32nd

Analysis and Improvement of the Maintenance Activity in the ...

引用

32nd International Conference on Flexible Automation and Intelligent Manufacturing

作者： Silva, Goncalo Avila, Liliana Pimentel, Carina Matias, Joao C. Univ Aveiro Dept Econ Management Ind Engn & Tourism Res Unit Governance Competitiveness & Publ Polici Aveiro Portugal Univ Minho Sch Engn Prod & Syst Dept Algoritmi Res Unit Campus Azurem Guimaraes Portugal

ISBN: (纸本)9783031381645;9783031381652

This article describes the work carried out with the objective of analyzing and improving the maintenance activity in the molding process of a company in the cork sector. Regarding the research design, an analysis of the production and maintenance process was carried out, which allowed an initial diagnosis with the identification of existing problems and the calculation of main maintenance Key Performance Indicators (KPIs). After, improvement actions were identified, planned and implemented in the molding process. A set of standards and best practices was established, and maintenance documentation updated. Additionally, equipment was changed, and the principles of Total Productive Maintenance (TPM) were incorporated, according to the Lean Production philosophy, promoting collaboration between the production and maintenance teams and autonomous maintenance. The post-implementation results revealed an improvement trend in the previously analyzed KPIs.

关键词： Maintenance TPM Lean Cork Industry

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Design and Implementation of a Slip Control for Electric Formula Student Vehicle Using Sliding Mode Control 16th

Design and Implementation of a Slip Control for Electric For...

引用

16th International Symposium on Advanced Vehicle Control

作者： Alfoldi, Adam Fenyes, Daniel Gaspar, Peter HUN REN Inst Comp Sci & Control Kende Utca 13-17 H-1111 Budapest Hungary

ISBN: (纸本)9783031703942;9783031703928;9783031703911

This paper presents a slip control design method for a four wheel driven electric race car with low hardware requirements. In addition, to achieve robustness against the changing frictional conditions, a discrete-time Luenberger tractive force observer is designed. The tuning is carried out using the high-precision vehicle dynamics simulation software CarMaker. The performance of the controller is demonstrated in real-world tests. An extensive comparison is given to show the advantage of the proposed method over a previously designed PID controller.

关键词： Sliding mode control Wheelslip control Electric race car

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