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Found 6289 publications

Warping transfer superelement model for bolted end-plate connections subject to 3D loads

B. Vaszilievits-Sömjén Majid Movahedi Rad J. Szalai

Publication Name: Sdss 2019 International Colloquium on Stability and Ductility of Steel Structures

Publication Date: 2019-01-01

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

A simple beam element based modelling technique has been developed which makes possible to analyze frames made of I sections with column-rafter bolted end-plate connections, subject to 3D loads, compatible with the thin walled beam theory with 7DOF beam elements. The model previously developed by the same team for welded connections has been extended with the addition of linear spring elements to model the bolts located at the upper and lower beam flange level. The spring stiffnesses are calculated based on the extension of the Eurocode component method and verified by simulations performed with FEA software Abaqus.

Open Access: Yes

DOI: DOI not available

Dataflow-based Heterogeneous Code Generator for IoT Applications

Endri Bezati Nebojša Taušan Gábor Paller Gábor Élo Gabor Farkas

Publication Name: International Conference on Model Driven Engineering and Software Development

Publication Date: 2019-01-01

Volume: Unknown

Issue: Unknown

Page Range: 326-332

Description:

The latest wave of connected digital systems, nowadays called Internet of Things (IoT) promises various gains, especially in terms of significant ease of data access. A large number of different platforms for IoT applications,however,makestheirdevelopmentdifficultandtime-consumingleadingtoprojectsthatarefailed to be on time, on budget or fully completed. To address the platform heterogeneity, this paper presents the ongoing work on development environment called Orcc-IoT. Orcc-IoT facilitates the development of IoT by combining dataflow modelling language, heterogeneous code generator and the library of ready-made IoT actors. The utilisation of Orcc-IoT in development is expected to increase the quality, and to reduce the development costs and time-to-market of IoT applications.

Open Access: Yes

DOI: 10.5220/0007496804260432

Preface

Maria Raffai Josef Basl Antonin Pavlicek Petr Doucek Katrin Detter A. Min Tjoa

Publication Name: Lecture Notes in Business Information Processing

Publication Date: 2019-01-01

Volume: 375 LNBIP

Issue: Unknown

Page Range: v

Description:

No description provided

Open Access: Yes

DOI: DOI not available

Maxwhere 3D capabilities contributing to the enhanced efficiency of the trello 2D management software

Ildiko Horvath

Publication Name: Acta Polytechnica Hungarica

Publication Date: 2019-01-01

Volume: 16

Issue: 6

Page Range: 55-71

Description:

This paper presents an experiment comparing the number of user operations and effectiveness of digital workflow in different cases. The main goal of this study is to systematically compare the effectiveness of Trello collaborative project management software in Windows 2D operating system and on the MaxWhere 3D VR platform. All comparisons are made based on a novel framework that focuses on both quantitative and qualitative assessments of user interactions required for the completion of digital projects within different computational environments. The results of the experiment, evaluated in terms of the proposed framework, point to the conclusion that when using Trello in conjunction with MaxWhere’s 3D VR spaces, users are able to accomplish the same digital workflows with 72% less elementary user operations, and with 80% less time spent on overview-related tasks. In the 3D experiment, the value of the Monitoring Density metric introduced in this paper increased almost 300-fold, from 125 to 3125. Based on these results, the paper concludes that the MaxWhere 3D VR platform offers project managers a number of ways to accomplish tasks that would otherwise require extremely complicated digital workflows in more traditional 2D environments.

Open Access: Yes

DOI: 10.12700/APH.16.6.2019.6.5

Numerical methods for solving the modified filter algebraic riccati equation for H-infinity filtering

Zsolt Horváth

Publication Name: Przeglad Elektrotechniczny

Publication Date: 2019-01-01

Volume: 95

Issue: 4

Page Range: 9-15

Description:

This paper presents numerical methods for solving the Modified Filter Algebraic Riccati Equation (MFARE) for synthesis of H-infinity fault detection filters. Two methods are presented, namely the gamma-iteration and then rewriting the MFARE in Linear Matrix Inequalities (LMIs) and casting it as a convex optimization problem. Each algorithm has to ensure the condition for a global convergence and also has to deliver an optimal solution. Not at least the computational cost has to be as small as possible.

Open Access: Yes

DOI: 10.15199/48.2019.04.02

Experimental investigation of single point incremental forming of aluminium alloy foils

Imre Paniti Dóra Harangozó Zsolt János Viharos

Publication Name: 16th Imeko Tc10 Conference 2019 Amp Amp Amp Amp Amp Quot Testing Diagnostics and Inspection as A Comprehensive Value Chain for Quality and Safety Amp Amp Amp Amp Amp Quot

Publication Date: 2019-01-01

Volume: Unknown

Issue: Unknown

Page Range: 50-55

Description:

Incremental Sheet Forming is a prosperous process to manufacture sheet metal parts that is well adapted for prototypes or small batch production. Compared to traditional sheet forming technologies this relatively slow process is only profitable for the above mentioned production types but it can be used in different applications in automotive and aircraft industries, in architecture engineering and in medical aids manufacturing. In this paper indirectly obtained axial forming force on Single Point Incremental Forming (SPIF) of variable wall angle geometry were studied under different process parameters. The estimation of the forces on AlMn1Mg1 sheets with 0.22 mm initial thickness is performed by continuous monitoring of servo motor currents. The deformation states of the formed parts were analysed using the ARGUS optical strain measurement system of GOM. Interaction plot of forming speed, incremental depth, tool diameter and lubrication were also reported.

Open Access: Yes

DOI: DOI not available

Investigation of railroad ballast particle breakage

Szabolcs Fischer Erika Juhasz

Publication Name: Pollack Periodica

Publication Date: 2019-01-01

Volume: 14

Issue: 2

Page Range: 3-14

Description:

This paper summarizes the authors up-to-date results in the research topic of railway ballast particles breakage test with individual laboratory test. In the past few years there were a lot of railway rehabilitation and maintenance project in Hungary, as well as abroad. The largest part of worlds railways has traditional superstructure, i.e. they are so called ballasted tracks. The railway ballast is the highest mass in the railways superstructure. Nowadays, it is a naturally fact that there is enough quantity of railway ballast in adequate quality. However, due to the modifications and restrictions in the related regulations since 2010, there are only few quarries in Hungary, which are able to ensure adequate railway ballast material for railway construction and maintenance projects for speed values between 120 and 160 km/h. Quarrying industry is stricken by aggravated environmental, heritage and conservation regulations year by year, it limits the accessibility of mineral wealth in significant manner. This fact with quality requirements means supply and quality risk in production of railway ballast in medium term. The main goal of authors research is to be able to simulate the stress-strain effect of ballast particles in real and objective manner in laboratory circumstances, as well as in discrete element method modeling. This paper introduces the exact assembly of executed laboratory test and newest test results. The authors summarize the up-to-date international literature review, using that they give short outlook to the planned research with research directions in near future.

Open Access: Yes

DOI: 10.1556/606.2019.14.2.1

Determination of two color agents in hard boiled candy by laser-based photoacoustic spectroscopy and colorimetry

Mihály Kovács David Richfield Ottó Dóka

Publication Name: Carpathian Journal of Food Science and Technology

Publication Date: 2019-01-01

Volume: 11

Issue: 4

Page Range: 126-132

Description:

Determination of color agents was performed by laser-based photoacoustic spectroscopy (LPAS) and colorimetry in hard boiled candies containing two different colorants (anthocyanin and beta carotene). LPAS and colorimetry are fast and direct methods which do not require any chemicals or complicated sample preparation such as extraction. Both LPAS and colorimetry were shown to be suitable for quick determination of anthocyanin and beta carotene content in hard boiled candies. The determination of anthocyanin content in colored hard-boiled candies is possible by LPAS at 532 nm or by colorimetry using ΔE*, while the beta carotene content can be measured by LPAS at 473 nm or by colorimetry using the Hue color index.

Open Access: Yes

DOI: 10.34302/2019.11.4.11

Characteristics of community supported agriculture in the western transdanubia region

Károly Kacz Judit Hegyi Nóra Gombköto

Publication Name: Deturope

Publication Date: 2019-01-01

Volume: 11

Issue: 1

Page Range: 42-54

Description:

Both industrialization of agriculture and globalization of food trade have begun in the 20th century. Consumer habits have also undergone major changes in line with altered processes in the structure of food trade initiating merits as well as drawbacks. For instance, currently small-scale agriculture or local product supporting consumption is increasingly forced to play a marginal role all over the world. Small farmers are underrepresented in most traded venue, while production is shifting towards bigger market participants. Locally, this means that the volume of production, labour requirements and diversity of products will be reduced, consequently local characteristics will slowly disappear. As an essential requirement for such production the traditional knowledge will not be able to be passed down to forthcoming generations. As a result of a survey, a problem and an objective tree of community supported agriculture was created. These problem/target trees were constructed after an analysis of CSA through a scrutiny of several farmer's organization and individual consumers in the Western Transdanubia region of Hungary. Followed by the evaluation of data the most influential factor, the basic problem was determined, as a consequence of which the long-term, strategic objective in terms of the market power of CSA organizations has been set forth.

Open Access: Yes

DOI: 10.32725/det.2019.003