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Found 6423 publications

The Effect of the Ball-Track Connection on the Energy Behavior of the Roller Gearing Gearbox

József Polák

Publication Name: Acta Polytechnica Hungarica

Publication Date: 2024-01-01

Volume: 21

Issue: 4

Page Range: 185-202

Description:

In this paper, I present an energetic study of the roller gearing gearbox by investigating the friction phenomena at the ball-track contact. The novelty of the subject is that the gearbox under investigation is a Hungarian invention, the energetic investigation of which has not been dealt with before. The study was carried out using a mathematical model based on analytical principles, in the course of which the principles and models used for ball bearings and ball screw drives were adapted and applied accordingly. It is important to mention that the study does not cover the complete gearbox, so losses outside the ball-race contact, e.g. bearing friction, seal friction, oil friction, air friction, etc., have not been considered in this paper.

Open Access: Yes

DOI: 10.12700/APH.21.4.2024.4.10

Exploring Fuzzy Signatures in Sensor Fusion: A Comparative Study with the Complementary Filter

Áron Ballagi Ahmet Mehmet Karadeniz Laszlo T. Koczy

Publication Name: Cinti 2024 IEEE 24th International Symposium on Computational Intelligence and Informatics Proceedings

Publication Date: 2024-01-01

Volume: Unknown

Issue: Unknown

Page Range: 69-74

Description:

Sensing has become a pivotal element in the development of autonomous systems with the advancement of the technology. These systems operate on a sense-think-act cycle to execute tasks, necessitating the integration of multiple sensors. The challenge of synthesizing meaningful information from diverse data sources escalates with the complexity of the data. This study tackles the issue of sensor data complexity by investigating the potential of Fuzzy Signatures, which are promising in handling complex data due to their hierarchical structures. The main goal is to present a concept for sensor fusion based on Fuzzy Signatures, which may facilitate their use in autonomous system tasks. To demonstrate this concept, accelerometer and gyroscope data are utilized, with results compared to those from a Complementary Filter providing insight into the sensor fusion capabilities of Fuzzy Signatures. The study also underscores the importance of aggregation operators in Fuzzy Signatures, focusing on the Max and WRAO (weighted relevance aggregation operator) aggregation operators. The potential to employ various aggregation operators or to develop new ones for specific applications is highlighted. The findings indicate that Fuzzy Signatures could be an effective solution for sensor fusion challenges, offering prospects for enhancement and broader application in autonomous systems.

Open Access: Yes

DOI: 10.1109/CINTI63048.2024.10830837

Special problems of interaction between railway track and bridge

Zoltán Major

Publication Name: Pollack Periodica

Publication Date: 2013-08-01

Volume: 8

Issue: 2

Page Range: 97-106

Description:

This paper deals with the phenomenon of track-bridge interaction in railway bridges. Due to the continuity of the rails on the structural expansion joints, the deformations of the deck might induce stresses in the rails that need to be checked. The main design criteria are now specified in Eurocode 1-2.

Open Access: Yes

DOI: 10.1556/Pollack.8.2013.2.11

Real-Time Video Streaming in MPT-GRE Multipath Networks

Naseer Al-Imareen G. Lencse

Publication Name: 2024 32nd International Conference on Software Telecommunications and Computer Networks Softcom 2024

Publication Date: 2024-01-01

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

Real-time video streaming over a multipath system enhances the quality of video delivery by diminishing packet loss, latency, and congestion, which eventually improves service quality and user experience. This paper addresses technical issues related to multipath routing, including path selection, packet scheduling, and path matching, and proposes solutions such as MPT-GRE. The effectiveness of MPT-GRE is assessed using recognized metrics such as PSNR, SSIM, and MSE, which are used to quantify differences in video quality. The paper aims to explore challenges and solutions in real-time video streaming over multipath networks, mainly focusing on MPT-GRE, while also quantitatively assessing the impact of streaming on video quality. In this paper, we selected a set of videos with different resolutions and specifications from the Waterloo Streaming QoE Database. The study measures how video quality assessment metrics influence streamed video through a network using the MPT-GRE communication library and demonstrates the efficiency of real-time video streaming using MPT-GRE. This paper presents evidence that MPT-GRE improves high-resolution video streaming, leading to a smoother and more reliable experience. These enhancements are validated using metrics such as PSNR, SSIM, and MSE, demonstrating the effectiveness of MPT-GRE in maintaining high video quality in multipath network environments.

Open Access: Yes

DOI: 10.23919/SoftCOM62040.2024.10721766

Technical Feasibility and Design Challenges of Unmanned Aerial Vehicle based Drive Testing on Cellular Networks

Oliver Takacs Istvan Drotar Tamas Kovacs György Wersényi

Publication Name: 2022 IEEE 1st International Conference on Internet of Digital Reality Iod 2022

Publication Date: 2022-01-01

Volume: Unknown

Issue: Unknown

Page Range: 23-32

Description:

Conventional drones are using ISM (Industrial, Scientific, and Medical) frequency bands during operation that can limit the range of the device. Limitations depend on the applied technologies in these frequency bands. With the help of cellular networks, BVLOS (Beyond Visual Line of Sight) UAV operations can be realized with increased safety. Unfortunately, base stations used in cellular networks target the lower, near-earth layers of air space. In case of drones, coverage in higher layers must be planned. Test procedures used in residential mobile network measurements record the quality parameters of the network measured on foot or by vehicle. Furthermore, the device carrying the measurement setup can cause serious interference with the measurement results. This paper presents current measurement methods and a concept for a solution to apply the measurement devices to an UAV. This new measurement method is correspondingly fit in the conception of IoD conference. We are executed the measurements by our own newly developed UAV system which can be a substitute solution of the walking measurements. Furthermore it provides opportunity to measurement some of that new layers of the air that have not had a chance before. Also, this innovation gives us the opportunity to perform measurements that have been difficult and dangerous so far, much easier and safer than before, without the need for human contact. In addition, measurements with drones have given a new perspective to the world of measurement methods.

Open Access: Yes

DOI: 10.1109/IoD55468.2022.9987208

Comparative Study of BASF Ultrafuse 316L and Markforged 17-4PH Stainless Steel Filaments Processed by Fused Filament Fabrication

Eszter Kókai Norbert Simon

Publication Name: International Journal of Automotive Science and Technology

Publication Date: 2025-12-17

Volume: 9

Issue: 1st Future of Vehicles Conf.

Page Range: 77-81

Description:

Metal additive manufacturing is receiving increased attention today, as major industries such as the automotive, aerospace, and medical sectors place a stronger emphasis on it. Among the numerous technologies, fused filament fabrication (FFF) is gaining more focus due to its relatively low equipment cost and ease of application. The production of a solid metal part begins with the extrusion of a metal powder-filled filament, followed by printing, debinding, and heat treatment, through which the final strength is achieved. Among the commercially available filaments, stainless steel–based composites are the most widespread, as they offer good printability, corrosion resistance, and mechanical stability. The two most used materials in this category are BASF Ultrafuse 316L and Markforged 17-4PH alloys. These two materials lend themselves well to comparison, as they are designed for the same manufacturing technology but exhibit different metallurgical behaviors and process requirements, thus providing a comprehensive view of the capabilities and limitations of metal FFF technology. In this study, we aim to demonstrate how these two materials differ in their processing requirements, microstructural evolution, and resulting mechanical performance, and to show what can be achieved when manufacturing metal composites using FFF technology. The main differences between the two filaments are presented in a comparative table to provide a clear and structured overview of their distinct characteristics.

Open Access: Yes

DOI: 10.30939/ijastech.1767208

Truck Load Positions Effect on Dynamic Behavior of Fractured Steel Box Girder Bridge

Rajmund Kuti M. Brinissat Richard P. Ray

Publication Name: Advances in Transdisciplinary Engineering

Publication Date: 2024-01-01

Volume: 59

Issue: Unknown

Page Range: 67-74

Description:

The harsh climate and environmental hazards contribute to the structural damage of steel bridges. Substantial dynamic loading from heavy trucks can worsen existing cracks. This paper investigates the dynamic behavior of a steel box girder bridge, the Szapáry bridge, with a fractured girder subjected to moving truck loads. Initially, a finite element model simulates the seven-span continuous bridge behavior during static load testing. The model also accurately simulated the dynamic load tests performed. A series of hypothetical damage (fractured girder) and dynamic loading scenarios reveal the effects of truck positions on the damaged bridge's dynamic response. Dynamic displacement induced due to traffic loading helps evaluate a bridge's structural health. Results of the parametric analysis highlight that several factors, including truck velocity and position, bridge span length, and truck lateral spacing, significantly affect the dynamic vibration of the fractured bridge. The results offer insight into the effectiveness of dynamic response analysis for conditioned-based maintenance and damage detection.

Open Access: Yes

DOI: 10.3233/ATDE240528

Investigation of deformations of a lithium polymer cell using the Digital Image Correlation Method (DICM)

Szabolcs Fischer Szabolcs Szalai Dóra Harangozó Szabolcs Kocsis Szurke

Publication Name: Reports in Mechanical Engineering

Publication Date: 2022-01-01

Volume: 3

Issue: 1

Page Range: 116-134

Description:

This research aims to investigate the adaptability of a measurement system or a process in determining the parameters of batteries. Methods are suggested for different applications, and properties gained by these measurements are specified. Deformations of lithium polymer batteries measured by various methodologies are also analyzed in detail. Changes in the geometry of worn-out batteries and the localization of the changes can be better understood by applying the results. The GOM ATOS and the GOM ARAMIS systems were applied to characterize lithium polymer batteries. Discontinuous tests were performed and the battery was discharged to 0 V and then fully charged for both methods. The advantages and disadvantages and the applicability of the two measurement systems were analyzed in this topic.

Open Access: Yes

DOI: 10.31181/rme20008022022s

Detraining Slows and Maintenance Training Over 6 Years Halts Parkinsonian Symptoms-Progression

Tibor Hortobágyi József Tollár Dávid Sipos Gergely Sántha Ward Nieboer Gábor Borbély György Áfra Emese Reichardt-Varga Katalin Tamási

Publication Name: Frontiers in Neurology

Publication Date: 2021-11-19

Volume: 12

Issue: Unknown

Page Range: Unknown

Description:

Introduction: There are scant data to demonstrate that the long-term non-pharmaceutical interventions can slow the progression of motor and non-motor symptoms and lower drug dose in Parkinson's disease (PD). Methods: After randomization, the Exercise-only (E, n = 19) group completed an initial 3-week-long, 15-session supervised, high-intensity sensorimotor agility exercise program designed to improve the postural stability. The Exercise + Maintenance (E + M, n = 22) group completed the 3-week program and continued the same program three times per week for 6 years. The no exercise and no maintenance control (C, n = 26) group continued habitual living. In each patient, 11 outcomes were measured before and after the 3-week initial exercise program and then, at 3, 6, 12, 18, 24, 36, 48, 60, and 72 months. Results: The longitudinal linear mixed effects modeling of each variable was fitted with maximum likelihood estimation and adjusted for baseline and covariates. The exercise program strongly improved the primary outcome, Motor Experiences of Daily Living, by ~7 points and all secondary outcomes [body mass index (BMI), disease and no disease-specific quality of life, depression, mobility, and standing balance]. In E group, the detraining effects lasted up to 12 months. E+M group further improved the initial exercise-induced gains up to 3 months and the gains were sustained until year 6. In C group, the symptoms worsened steadily. By year 6, levodopa (L-dopa) equivalents increased in all the groups but least in E + M group. Conclusion: A short-term, high-intensity sensorimotor agility exercise program improved the PD symptoms up to a year during detraining but the subsequent 6-year maintenance program was needed to further increase or sustain the initial improvements in the symptoms, quality of life, and drug dose.

Open Access: Yes

DOI: 10.3389/fneur.2021.737726