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

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Trajectory Tracking for High-Performance Autonomous Vehicles with Real-Time Model Predictive Control 16th

Trajectory Tracking for High-Performance Autonomous Vehicles...

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16th International Symposium on Advanced Vehicle Control

作者： Pierini, Matteo Fusco, Paolo Senofieni, Rodrigo Corno, Matteo Panzani, Giulio Savaresi, Sergio Matteo Politecn Milan Dipartimento Elettron Informaz & Bioingn Via Ponzio 34-5 I-20133 Milan Italy

ISBN: (纸本)9783031703942;9783031703928;9783031703911

This work is the development of a Model Predictive Controller (MPC) for the integrated control of lateral and longitudinal dynamics of a high-performance autonomous car, which follows a given trajectory on a racetrack. The MPC model is based on an Affine-Force-Input single-track nonlinear bicycle model that accounts for actuation dynamics and delays. The MPC problem is formulated as a quadratic problem, enabling efficient real-time solution with a specific quadratic programming (QP) solver. The controller is implemented in C++ and tested in a real-time hardware-in-the-loop (HIL) simulator, showing excellent tracking performance up to 280 km/h.

关键词： high-performance autonomous driving real-time model predictive control trajectory tracking vehicle dynamics control

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Considerations for the Implementation of a Train Vibration Monitoring System in Subway Tunnels 14th

Considerations for the Implementation of a Train Vibration M...

引用

14th International Workshop on Railway Noise (IWRN)

作者： McKenna, Shannon Rajaram, Shankar Nelson, James Tuman Saurenman, Hugh J. Cross Spectrum Acoust 400 Corp PointeSuite 300 Culver City CA 90230 USA Sound Transit 401 S Jackson St Seattle WA 98104 USA Wilson Ihrig & Associates 5900 Hollis StSuite T1 Emeryville CA 94608 USA ATS Consulting 130 W Bonita Ave Sierra Madre CA 91024 USA

ISBN: (纸本)9789819978519;9789819978526

The Northgate Link extension of the Sound Transit Link Light Rail system starts at the southern end of the University of Washington (UW) Seattle campus and extends northward beneath the campus in twin-bore tunnels. To address UW concerns that train-generated ground vibration may negatively affect sensitive research, Sound Transit agreed to install a vibration monitoring system in the tunnels and use the measured tunnel vibration to identify any trains that generate vibration that might exceed negotiated limits. Prior to train operations, the relationships between the third octave vibration measured by the monitors within the tunnel and in the sensitive facilities were estimated using a shaker as a vibration source. This paper describes the verification phase of the project, where vibration from test-train operations was used to refine the estimates based on the shaker data.

关键词： Groundborne vibration Vibration monitoring Vibration sensitive laboratories

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Innovation of the Manufacturing Company by Using of Digitization Tools 8th

Innovation of the Manufacturing Company by Using of Digitiza...

引用

8th International Scientific-Technical Conference (MANUFACTURING)

作者： Knapcikova, Lucia Behunova, Annamaria Tauberova, Rebeka Marticek, Matus Husar, Jozef Tech Univ Kosice Presov Slovakia Tech Univ Kosice Kosice Slovakia

ISBN: (纸本)9783031564468;9783031564444

The quality of production, the performance of deliveries and the success of the business depend to a large extent on the people who work in production. It is why, despite the growing robotisation and digitisation in the manufacturing industry, human capital remains one of the strengths of today's organisations. In this context, education and the professional training of workers in the activities performed are crucial for any company to prosper and maintain its position in an increasingly competitive and changing environment. In some industries, such management of operator skills training is even more important due to the complexity of production processes and work changes caused by different volumes of activities or demand variability. If employees have to rely on low-quality work instructions, they are less efficient, make more mistakes and are less satisfied with their work. Therefore, it is in the interest of companies to avoid this quality deficiency. The manuscript is dedicated to digitalisation, specifically e-workstations in a manufacturing company, where it is important to minimise worker errors and time wasting.

关键词： workflow e-workstation employee training

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The Scenario Approach to the Concept of Maintenance of Technical Systems of Urban engineering 8th

The Scenario Approach to the Concept of Maintenance of Techn...

引用

8th International Scientific-Technical Conference (MANUFACTURING)

作者： Loska, Andrzej Paszkowski, Waldemar Waszkowski, Robert Silesian Tech Univ Gliwice Poland Mil Univ Technol Warsaw Poland

ISBN: (纸本)9783031564468;9783031564444

The work includes an overview of the possibilities and needs for implementing the exploitation decision-making process regarding the subsystems of the urban engineering system in the conditions of implementation and operation of the SmartCity concept. Based on discussions on key operational problems, in the first part of the article, the SmartMaintenance concept was proposed. Its implementation allows to maintain the exploitation potential of technical systems at an appropriate level. The second part of the article includes a proposal of scenario method as a solution of exploitation policy modeling problem. Scenarios and computer support tools built on this basis enable effective assessment of the implementation of exploitation processes, which is particularly important in long-term conditions of significant decision uncertainty. A set of supporting tools has been developed to implement the SmartMaintenance concept proposed and described in the article. The final part of the article describes the operation of one of the most important such tools - the SMOPE. This tool helps create scenarios and also contains mathematical algorithms to evaluate them.

关键词： Scenarios SmartCity Exploitation Maintenance Decision-Making Process Exploitation Events Exploitation Processes

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A Study of Clean Water Supply After Earthquake at Lombok Utara Regency, Indonesia 1

引用

2022 International Association for Hydraulic Environmental engineering and Research Asia Pacific Division

作者： Hidayat, Ari Ramadhan Legono, Djoko Supraba, Intan Triatmadja, Radianta Univ Gadjah Mada Yogyakarta Indonesia

ISBN: (数字)9789819760091

ISBN: (纸本)9789819760084;9789819760091

Clean water is the most important thing for human health, communities, and economy. Safe drinking water is required to ensure public health. One option to obtain clean water is by being a customer of Regional Drinking Water Company (RDWC). However, the pipelines of RDWC can experience damage in natural disaster-prone areas. Lombok Utara is one of the regencies in Indonesia which often experiences earthquakes. Earthquakes occurred at Lombok Utara Regency in Lombok Island last July and August 2018 with magnitude 6.4 MW and 6.9 MW, respectively. The Lombok Utara people obtained clean water from its RDWC with main water source from Jongplangka spring with total capacity 137 L/s. The objective of this study is to evaluate the condition of the Jongplangka Pipelines Network of Lombok Utara Regional Drinking Water Company (RDWC) before and after the earthquakes by using software WaterNet Beta3-19 version and to propose alternative clean water sources for mitigation effort. Results showed that some pipes have important roles that affect the other pipes at their downstream side. Thus, Lombok Utara RDWC shall consider the simulation result of WaterNet to reduce the risks if those pipes experience damages. Lombok Utara Island has groundwater potential, so drill wells construction was proposed to fulfill the clean water demand after the earthquake.

关键词： Clean water Earthquake Pipeline network

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Integration of Material Simulation to Extend the Accuracy of FEM Results for Metallic Forming Processes 14th

Integration of Material Simulation to Extend the Accuracy of...

引用

14th International Conference on Numerical Methods in Industrial Forming Processes (NUMIFORM)

作者： Helas, Kristin Biba, Nikolay GMT Gesell Met Technol & Softwareentwicklung MbH Heinersdorfer Str 12 D-13086 Berlin Germany Micas Simulat Ltd Oxford England

ISBN: (纸本)9783031580086;9783031580062;9783031580055

Nowadays, almost all metallic forming processes can be mapped by FEM simulation. Demands on FEM simulation are becoming increasingly higher with regard to the representation of very fine tolerances, whether in terms of temperature or dimensional accuracy. The combination of a FEM software suitable for the forming process and a connected materials database is a great potential to enlarge these precision figures. In the article, real simulation examples with QForm UK are used to show how this combination positively affects the accuracy of simulation results. For this purpose, several material data-such as flow curves, temperature-dependent properties, or CCT diagrams-and material models-such as the recrystallization or phase transformation model-from the materials database MatILDa (R) are applied. Hereby, the possibilities of material simulation are demonstrated and practical methods to improve individual simulation projects are given.

关键词： Material simulation FEM simulation Flow curves Recrystallization model Phase transformation model

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Assembly Path Planning with Collision Avoidance 10th

Assembly Path Planning with Collision Avoidance

引用

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

作者： Ben Said, Salma Aifaoui, Nizar Natl Engn Sch Monastir Mech Engn Lab Monastir Tunisia

ISBN: (纸本)9783031671517;9783031671524

The assembly process plan describes the different stages to be achieved, from the initial product design ideas until the manufacturing phase. Usually, path planning is generated during the manufacturing steps. However, with the progress of computer tools and CAD environment, the automation of manufacturing lines has become a challenging issue to develop. This progress puts pressure on manufacturers to improve their competitiveness and to react and anticipate since the design phase. Consequently, developing an automatic tool supporting the engineers to generate assembly path planning during early concept phase is highly motivated. This is a challenging task to be carried out in a 3D environment. In this context, this work aims to develop a new approach permitting the generation of multidirectional assembly path planning starting from a CAD assembly model. The generated path should permit to escape collision with static obstacles of the external assembly environment. The different steps of the suggested method are presented. An illustrative example was treated for validation.

关键词： Assembly Path Plan CAD Obstacle

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Robust Inverse Vehicle Map Regression Based on Laplace Distribution 16th

Robust Inverse Vehicle Map Regression Based on Laplace Distr...

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16th International Symposium on Advanced Vehicle Control

作者： Penet, Maxime Le Gall, Gaetan Valeo Mobil Tech Ctr 6 Rue Daniel Costantini F-94000 Creteil France

ISBN: (纸本)9783031703942;9783031703928;9783031703911

This paper deals with the identification of the relationship between vehicle acceleration and driver available actuators. The vehicle is modeled based on how a driving task is performed. The model is constructed using neural networks whose weights are identified using data collected through non tailored driving sessions. To take into account disturbances, the model follows a Laplace distribution. This leads to a more robust estimate of the vehicle knowledge and the confidence we have in it. The approach is illustrated on a prototype vehicle equipped with a petrol engine, plus a device to actuate the pedals.

关键词： Neural network Laplace distribution Pedal control

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Effect of Welding Processes on Microstructure and mechanical Properties of Laser-Welded Al-Si-Coated 22MnB5 Steel 14th

Effect of Welding Processes on Microstructure and Mechanical...

引用

14th International Conference on Numerical Methods in Industrial Forming Processes (NUMIFORM)

作者： He, Qi Hou, Zeran Kong, Jie Deng, Lulu Ma, Xiaolong Min, Junying Tongji Univ Sch Mech Engn Shanghai 201804 Peoples R China Pan Asia Tech Automot Ctr Co Ltd Shanghai 201201 Peoples R China

ISBN: (纸本)9783031580086;9783031580062;9783031580055

Tailor welded blank (TWB) has been developed in the automotive industry to improve structural safety and material efficiency. Al-Si-coated 22MnB5 steel is the main material for laser tailor welding due to its resistance to oxidation and decarburization during hot stamping, which can otherwise deteriorate the performance of welded joints. This study investigates the use of partial ablation welding (PAW) and filler wire welding (FWW) as compared to traditional self-fusion welded (SFW) to enhance the mechanical performances of Al-Si-coated 22MnB5 steel welded joints. The effects of welding processes on the microstructure of welded joints as well as the mechanism of performance enhancement were investigated. Tensile testing results showed that PAW and FWW joints consistently fractured at the base material, whereas the SFW joints fractured at the weld seam. The maximum tensile loads of PAW and FWW joints were, respectively, 12.75 and 12.93% higher than that of SFW joints. Additionally, the microhardness distribution of PAW and FWW joints is uniform with no softening zone. Finally, the study discusses the improved mechanical properties of PAW and FWW joints in terms of microstructural evolution and diffusion of Al elements.

关键词： 22MnB5 steel Laser welding Microstructure Al-Si coating mechanical properties

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Do CMIP6 GCMs Outperform Cordex RCMs in Simulating Near-Surface Wind Speed Climate Over The Indian Ocean? 23rd

Do CMIP6 GCMs Outperform Cordex RCMs in Simulating Near-Surf...

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2022 International Association for Hydraulic Environmental engineering and Research Asia Pacific Division

作者： Lakku, Naresh Kumar Gond Behera, Manasa Ranjan Indian Inst Technol Dept Civil Engn Mumbai 400076 Maharashtra India Indian Inst Technol Ctr Climate Studies Mumbai 400076 Maharashtra India

ISBN: (纸本)9789819760084;9789819760091

The reliable future wind climate projections are important in assessing the impact of climate change on the wind energy sector and wind-driven processes (ocean-wave energy, evapotranspiration and air-pollution modelling). The future wind speed projections are available from several climate models. Moreover, the climate model outputs are uncertain and one of the model uncertainty arises because of assumptions, simplifications and parameterizations made in the climate models. It can be minimized by choosing a reliable future projected wind from a climate model as suggested in this study. The current study provides the information on the performance of thirty-three Global Climate Models (GCMs) of sixth phase Coupled Model Intercomparison Project (CMIP6) and sixteen Regional Climate Models (RCMs) of Coordinated Regional Downscaling Experiment (CORDEX) in simulating historical (1979-2005) near-surface wind speed at diverse climate variable scales (daily, monthly, seasonal and annual) over the Indian Ocean (IO) relative to fifth-generation European Research Agency reanalysis dataset. From the intercomparison of climate models, it is found that most of the CMIP6 GCMs are significantly performing better than high-resolution CORDEX RCMs over IO. The climate models EC-EARTH-3-CC, MPI-ESM1-2-HR, EC-EARTH-3-VEG and AWI-CM-1-1-MR are identified as the best-performing climate models and MPI-M-MPI-ESM-MR (RegCM4-4) and NCC-NorESM1-M (RCA4) CORDEX RCMs as poor-performing climate models over IO. This paper will aid in the selection of an appropriate climate model for wind dependent climate change impact assessment and will result in reducing model-based uncertainty.

关键词： CMIP6 GCMs CORDEX RCMs Wind speed Indian Ocean Evaluation

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