Search in Publications

Found 6327 publications

Managing Practice Based Teaching of Sustainable Urban Mobility Planning (SUMP) Using Digital Tools During COVID’19

Petra Szakonyi Patrícia Honvári

Publication Name: Springer Proceedings in Business and Economics

Publication Date: 2023-01-01

Volume: Unknown

Issue: Unknown

Page Range: 335-354

Description:

Sustainable Urban Mobility Planning (SUMP) is one of the key element of the new EU Urban Mobility Framework. The European Commission has offered variety of programs in the previous years, such as the Horizon 2020 to support Member States to promote SUMPs in their region, and still offers funding for range amount of sustainable settlement and transport related projects. At the same time Member States are also keen on to maintain the roll out of SUMPs within their national support program, with public transport, walking and cycling at its heart. In the last decade the authors took part in the development of many SUMPs and since 2020 the authors participated in an international, so called UrbanSCOPE—Urban Sustainable Mobility in focus: student education, community involvement and participative planning, Erasmus+ project, that aim was to improve the quality of teaching in universities, by offering students a methodology in the preparation of a SUMP for a locality in their cities, actively involving local communities and local authorities in the process. During the project educational packages: learning materials for students and teaching guides for lecturers were developed, in order to let understand sustainable mobility better, than before and as well as to experience the rights of participation in the planning of sustainable mobility. With the contribution of the authors new digital tools were also introduced for teachers and students during the COVID’19, that helped to rise the efficiency of planning during restrictions and lock down.

Open Access: Yes

DOI: 10.1007/978-981-19-8485-3_14

CONNECTION BETWEEN TRACK GEOMETRY QUALITY AND DYNAMIC VEHICLE RESPONSE AT VARIOUS SPEEDS

Csaba Ágh

Publication Name: Baltic Journal of Road and Bridge Engineering

Publication Date: 2023-01-01

Volume: 18

Issue: 3

Page Range: 169-187

Description:

Track geometry measurements are widely used for describing track quality. However, derailments and track deterioration are caused by forces arising in vehicle-track system. This research focuses on two types of vehicle response. Firstly, the inf luence of the longitudinal level irregularities on the vertical wheel-rail forces was examined. Secondly, the correlation between the lateral axle box acceleration and the cross level irregularities was investigated. Track geometry and vehicle response data were acquired simultaneously by a track recording car, formed from a passenger car, at various speeds up to 130 km/h. Vehicle-track forces were calculated based on accelerometers mounted on the car body, bogies and axle boxes, considering mass and moment of inertia. Non-linear regressions resulted in vertical vehicle-track force estimation functions. It was proven that the use of second spatial derivatives of the longitudinal level gave a better estimation than the use of reference TQIs according to European Standard EN 13848-6. A linear relationship was found between the speed and standard deviation of vertical vehicle-track forces. On straight sections with constant speed, correlation coefficients of around 0.8 were found between second spatial derivatives of cross level and lateral axle box acceleration.

Open Access: Yes

DOI: 10.7250/bjrbe.2023-18.613

A Localized Version of the Method of Fundamental Solutions in a Multi-level Context

Csaba Gáspár

Publication Name: Periodica Polytechnica Civil Engineering

Publication Date: 2023-01-01

Volume: 67

Issue: 3

Page Range: 716-724

Description:

The Method of Fundamental Solutions is applied to the Laplace equation. Instead of using the traditional approach with external source points and boundary collocation points, the original domain decomposed into a lot of smaller, overlapping subdomains, and the Method of Fundamental Solutions is used to the individual local subdomains. After eliminating the local source points, local schemes are obtained. Instead of constructing a global scheme, the local subproblems are solved sequentially, in an iterative way. This mimics a multiplicative Schwarz method with overlapping subdomains, which assures the convergence of the method. Combining the iteration with a simple Seidel-type method, the resulting iteration is used as a smoothing procedure of a multi-level method. The points belonging to the coarse and fine levels are defined by a quadtree-generated cell system controlled by the boundary of the original domain. The multi-level character of the obtained method makes it possible to reduce the necessary number of iterations, that is, the overall computational cost can be significantly reduced. Moreover, the solution of large and ill-conditioned systems is completely avoided. The method is illustrated through several numerical test examples.

Open Access: Yes

DOI: 10.3311/PPci.21535

Cogging Torque Analysis of Toyota Prius 2004 IPMSM Motor with the Digital-Twin-Distiller

Mihaly Katona Péter Kiss Tamas Orosz Krisztián Gadó

Publication Name: Lecture Notes in Mechanical Engineering

Publication Date: 2023-01-01

Volume: Unknown

Issue: Unknown

Page Range: 126-138

Description:

With the recent advancements of the fourth industrial revolution, many sensors are implemented into the products that collect the data and monitor their performance. The measurement data can be stored with the numerical models as a digital twin, and these can serve as a virtual replica of a physical object or process. These digital twins can improve the design and optimization process. The paper uses an open-source tool, the Digital-Twin-Distiller, which can encapsulate the realized finite element analysis of a model into a web application, which can be integrated easily into an optimization chain or any other business process. The paper proposes a numerical model and cogging torque analysis of an interior permanent magnet synchronous machine. The paper examines the effect of two parameters of the magnet groove shape on the cogging torque of the Prius 2004 motor model. It was found that the cogging torque of the motor is highly dependent on the shape of the flux barrier, even with minor changes. On the other hand, the wedge between the two magnets does not affect cogging torque much.

Open Access: Yes

DOI: 10.1007/978-3-031-15211-5_11

Evaluating Fuel Consumption Rates Based on Rising Travel Demands Generated by Autonomous Vehicles

Balazs Horvath Dilshad Mohammed

Publication Name: Chemical Engineering Transactions

Publication Date: 2023-01-01

Volume: 107

Issue: Unknown

Page Range: 553-558

Description:

Autonomous Vehicles (AVs) are anticipated to revolutionize the transportation sector by enhancing mobility and efficiency. However, the rise in travel demand resulting from increased accessibility and convenience may counterbalance the potential fuel savings associated with AVs. For this reason, this study examines the relationship between travel demand and fuel consumption, considering factors such as travel time, number of trips, and travel patterns. Through a combination of theoretical analysis and empirical data, the research aims to quantify the net effect of travel demand increment under varying demand scenarios using AVs on fuel consumption. The results showed that with the convenience of AVs, people may be more willing to tolerate longer commutes. This has led to an increase in Vehicle Hours Travelled, which directly translated to higher fuel consumption. These findings provide valuable insights for policymakers and stakeholders in designing sustainable transportation strategies and optimizing the energy efficiency of AV-based mobility systems.

Open Access: Yes

DOI: 10.3303/CET23107093

Validation Process of the Computer Simulation of a Test-Purpose Self-Driving Vehicle

Áron Ballagi Miklos Unger Rudolf Krecht

Publication Name: Iavvc 2023 IEEE International Automated Vehicle Validation Conference Proceedings

Publication Date: 2023-01-01

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

The aim of this article is to propose the initial validation steps for a test-purpose self-driving vehicle. The basis of the computer simulation in question is a passenger vehicle converted to be capable of specific self-driving tasks, meaning that it features a complete low-level control system, an onboard computer for high-level computation and a full sensor set consisting of laser scanners, lidars, cameras and GNSS receivers. The computer simulation of the described vehicle is created using the SVL Autonomous Vehicle Simulator and aims to completely model the behavior of the real transformed vehicle. To ensure the fidelity of the computer simulation, a set of comparative measurements are defined, which are realized using both the real vehicle and its computer simulation. The basis of comparison is, on one hand, the assessment of the vehicle control system by comparing control input and output, on the other hand, the comparison of onboard sensor measurement results.

Open Access: Yes

DOI: 10.1109/IAVVC57316.2023.10328107

Frame Design Using Nonprismatic Members – Satisfying the Need for Speed

B. Vaszilievits-Sömjén J. Szalai Donald W. White

Publication Name: Proceedings of the Annual Stability Conference Structural Stability Research Council Ssrc 2023

Publication Date: 2023-01-01

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

This paper discusses a combination of best practices and procedures from recent work in Europe and the US, providing rational and economical calculations addressing the complexities associated with frame design using nonprismatic members. Recommendations are provided in the context of US design practice. A primary objective is to achieve maximum simplicity, transparency, and design speed while facilitating rigor of the underlying calculations. The paper provides several focused examples illustrating the recommended design verification procedures.

Open Access: Yes

DOI: DOI not available

Transport Development Challenges of Brownfield Investments in the Name of Sustainability

Petra Szakonyi Emese Makó

Publication Name: Proceedings of the 2nd International Conference on Water Energy Food and Sustainability Icowefs 2022

Publication Date: 2023-01-01

Volume: Unknown

Issue: Unknown

Page Range: 36-47

Description:

Reconstruction of brownfield sites is part of the EU cohesion policy, a priority area for EU development funding, and a permanent theme for the Committee of the Regions. Redevelopment of brownfield sites is also a solution to ensure sustainable urban sprawl and land management. One of the main advantages of brownfield investments over greenfield investments is, that on the one hand it is not necessary to build the utility infrastructure and road network because it is already built, and on the other hand the development is land-saving, as it is not necessary to declare new undeveloped areas as construction areas. Another advantage can be mentioned: the investment is implemented and the improvement of the environmental conditions, contributing to the appreciation and sustainable development of the settlement. At the same time, the development of brownfields causes challenges during urban planning. On the one hand, an attractive regulatory environment has to be created in the master plans for investors, usually with a high building ratio, but on the other hand, sustainable transport for the area still has to be ensured for the long term. According to our experiences, in order to satisfy the cost-effective investment intention of investors, there is a need to ensure the maximum build-up density of the area, which generates a much higher transport demand than before, which the existing transport infrastructure and services can no longer fulfil, and therefore capacity expansion will be required. However, to ensure sustainable settlement development, the additional traffic demand generated by the brownfield redevelopment must be served following the methodology and criteria of sustainable transport development. Using the experience of a Hungarian case study, the authors present a new brownfield redevelopment model, which can help decision-makers and planners to make the right settlement planning decisions, apply optimal transport planning criteria and methods, and select the adequate, sustainable transport development tools for brownfield investments, during preparation and implementation.

Open Access: Yes

DOI: 10.1007/978-3-031-26849-6_5

Generalized Objective Function to Ensure Robust Evaluation for Evolutionary Storage Location Assignment Algorithms

Tamás Bódis Polina Görbe

Publication Name: Communications in Computer and Information Science

Publication Date: 2023-01-01

Volume: 1864 CCIS

Issue: Unknown

Page Range: 546-559

Description:

The efficiency of warehouse operations can be measured by various indicators, but the main one is the lead time, which is heavily influenced by the order picking, as this is the most time- and labor-intensive process in the warehouse operation. In order to reduce lead times, many researchers are working on the topic of Storage Location Assignment Problem (SLAP) The optimized SLA is designed to improve picking efficiency, so that the picker does not have to travel long distances unnecessarily in a picker-to-parts system. During the optimization process, it is necessary to evaluate the SLA in an appropriate way, on the basis of which it is possible to measure whether the objectives are approximated by the results or not. It is also very important to evaluate regularly the SLA during the period after optimization to get an up-to-date information about the assignment of the storage items. The results of regular evaluations can be used to check whether the SLA is effective and lead times are good or whether optimization and reassignment is necessary. Based on studies and experience, SLAs are reassessed and optimized following significant inefficiencies, resulting in relocation tasks and additional work and costs for warehouses. The authors’ research concept includes avoiding large-scale relocation tasks by continuously review the SLA. While other studies evaluate the optimized SLA by running picking lists, but it usually would be necessary to get information about the assignment of the entire warehouse. Furthermore, since assigning thousands of items to thousands of positions is a huge combinational problem, evolutionary algorithm would be necessary to apply. It is also requiring time-effective and generalized individual evolution method to make us possible tactical SLA optimization. The aim of this paper is to describe a novel generalized SLA evaluation method where each of the located items is evaluated to obtain a more accurate optimization result. Furthermore, unlike other research, the aim is to ensure that the optimization concept and the evaluation method are not only specified for one warehouse but can be used in other warehouses as well.

Open Access: Yes

DOI: 10.1007/978-3-031-41774-0_43