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Found 6407 publications

Determination of the Centre of Gravity of Electric Vehicles Using a Static Axle-Load Method

David Jozsa Balázs Baráth

Publication Name: Future Transportation

Publication Date: 2026-02-01

Volume: 6

Issue: 1

Page Range: Unknown

Description:

Accurate determination of a vehicle’s centre of gravity (CoG) is fundamental to driving dynamics, safety, and engineering design. However, existing static CoG estimation methods often neglect tyre deflection and detailed wheel geometry, which can introduce significant errors, particularly in electric vehicles, where the low and concentrated mass of the battery pack increases the sensitivity of vertical CoG calculations. This study presents a refined static axle-load-based method for electric vehicles, in which the influence of tyre deformation and lifting height on the accuracy of the vertical centre of gravity coordinate is explicitly considered and quantitatively justified. To minimise human error and accelerate the evaluation process, a custom-developed Python (Python 3.13.2.) software tool automates all calculations, provides an intuitive graphical interface, and generates visual representations of the resulting CoG position. The methodology was validated on a Volkswagen e-Golf, demonstrating that the proposed approach provides reliable and repeatable results. Due to its accuracy, reduced measurement complexity, and minimal equipment requirements, the method is suitable for design, educational, and diagnostic applications. Moreover, it enables faster and more precise preparation of vehicle dynamics tests, such as rollover assessments, by ensuring that sensor placement does not interfere with vehicle behaviour.

Open Access: Yes

DOI: 10.3390/futuretransp6010022

Simulating near-surface water infiltration in the Szigetköz region

Asma Gharbi Richard P. Ray

Publication Name: Pollack Periodica

Publication Date: 2026-01-01

Volume: Unknown

Issue: Unknown

Page Range: Unknown

Description:

The Szigetköz region in north-west Hungary is ecologically sensitive and lies in the Danube River system. Over the past 40 years, ground water and surface water levels have varied significantly due to human activity. This study uses HYDRUS-1D code to simulate shallow ground water dynamics in 1–2 m deep soil profiles. Local meteorological data, soil types (loam, sandy loam, clay loam), vegetation (pasture, corn), and ground water levels inform the model. Results show how dry, average, and wet years affect soil moisture and recharge. The study highlights the impact of vegetation type and ground water depth on infiltration. Findings support future work on climate change, land use, and sustainable water management.

Open Access: Yes

DOI: 10.1556/606.2026.01408

The probability of obstructive sleep apnea disorders emergence by odds ratio of main risk factors

Ferenc Ihász Krisztina Szabó

Publication Name: Orvosi Hetilap

Publication Date: 2017-05-01

Volume: 158

Issue: 21

Page Range: 823-828

Description:

Introduction: The quality of sleep plays a serious role in the individual's daytime performace and state of health, there by it has a strong influence on the society. Aim: The present study measures the probability developing and severity of obstructive sleep apnea syndrome, - which belongs to group of disorders of the respiratory - through odds ratio of leading risk factors. Method: 127 persons were examined in the test. The sleep structure test data were processed by polysomnographic screening device. Results: The nutritional level of body in mass index (BMI), and the neck circumferences data were recorded in cm. On the basis of the examination the gender as a risk factor it can be said that the odds ratio for men compared to women, more than three times higher of emergence of disease. Conclusions: Men's chance of the emergence of serious disease is more than four times higher than women's chance. In the men's test group the most significant predictor of obstructive sleep apnea amongst the risk factors is the circumference according to odds ratio. In women's group the leader odds ratio is BMI. More than 50% of test goup don't report about daytime sleepiness, and this fact draws our attention to the role of risk factors' odds ratio in selection.

Open Access: Yes

DOI: 10.1556/650.2017.30742

On a translated frame-based approach to geometric modeling of robots

Claudiu Radu Pozna Radu Emil Precup

Publication Name: Robotics and Autonomous Systems

Publication Date: 2017-05-01

Volume: 91

Issue: Unknown

Page Range: 49-58

Description:

The geometric modeling gives the structure configuration and enables the derivation of the kinematic or dynamic models of robots, it involves a procedure for reference frames definition and a specific formalism that allows the poses transformations from a reference frame to another one. This paper proposes a new geometrical modeling approach, referred to as the translated frame-based approach, which has two main advantages over the state-of-the art, namely the reference frames definition is intuitive and it eliminates the computation of the transformation operators. The frames definitions are reduced to apparent translations of the base frame and the computation is replaced with choosing an operator from a collection of six operators that cover all transformation possibilities. The suggested approach is validated by the computation of the geometric models of a PUMA robot and a redundant robot.

Open Access: Yes

DOI: 10.1016/j.robot.2017.01.004

A novel unified approach to invariance conditions for a linear dynamical system

Yunfei Song Tamás Terlaky Zoltán Horváth

Publication Name: Applied Mathematics and Computation

Publication Date: 2017-04-01

Volume: 298

Issue: Unknown

Page Range: 351-367

Description:

In this paper, we propose a novel, simple, and unified approach to explore sufficient and necessary conditions, i.e., invariance conditions, under which four classic families of convex sets, namely, polyhedra, polyhedral cones, ellipsoids, and Lorenz cones, are invariant sets for a linear discrete or continuous dynamical system. For discrete dynamical systems, we use the Theorems of Alternatives, i.e., Farkas lemma and S-lemma, to obtain simple and general proofs to derive invariance conditions. This novel method establishes a solid connection between optimization theory and dynamical system. Also, using the S-lemma allows us to extend invariance conditions to any set represented by a quadratic inequality. Such sets include nonconvex and unbounded sets. For continuous dynamical systems, we use the forward or backward Euler method to obtain the corresponding discrete dynamical systems while preserves invariance. This enables us to develop a novel and elementary method to derive invariance conditions for continuous dynamical systems by using the ones for the corresponding discrete systems. Finally, some numerical examples are presented to illustrate these invariance conditions.

Open Access: Yes

DOI: 10.1016/j.amc.2016.10.007

On the physical and mathematical interpretation of the isokinetic hypothesis

Tamás Réti

Publication Name: Journal De Physique IV JP

Publication Date: 2004-12-01

Volume: 120

Issue: Unknown

Page Range: 85-91

Description:

Based on the investigation of additive kinetic differential equations it is shown that the concept of the traditional isokinetic hypothesis defined by Christian can be easily generalized. By introducing the notion of the weakly isokinetic process, it is verified that the extended isokinetic model can be expressed in terms of an integro-differential equation. A special property of this integro-differential equation is that its right-hand side includes such state-parameters, which are determined by the whole temperature history (i.e. each state parameter is a functional of the time-temperature function, or any other selected state functions). © EDP Sciences.

Open Access: Yes

DOI: 10.1051/jp4:2004120009

The Dynamic Properties of Sand under Torsion: A Literature Review

Majd Ahmad Richard P. Ray

Publication Name: Geotechnics

Publication Date: 2023-06-01

Volume: 3

Issue: 2

Page Range: 480-514

Description:

Resonant column (RC) and the torsional simple shear (TOSS) tests have shown proven competency in acquiring precise and repeatable measurements regarding the shear modulus and damping ratio of soil. For most dynamic geotechnical problems, the shear modulus represents the stiffness of the soil, while the damping ratio describes energy dissipation. Many studies in the last few decades focused on developing the relevant equipment and investigating the effect of different soil properties on the dynamic behavior of soil. Researchers have introduced correlations to approximate this behavior without conducting dynamic torsional testing. Soil models (e.g., Ramberg-Osgood and Hardin-Drnevich) can simulate shear stress-strain curves after finding the curve-fitting parameters. Due to the complexity of dynamic behavior and its dependency on various factors in soils, the RO and HD equations help model the behavior more simply. This paper presents a literature review and evaluation of the studies, correlations, soil models, and parameters affecting the dynamic behavior of dry sand under torsion.

Open Access: Yes

DOI: 10.3390/geotechnics3020027

A Comprehensive Model for the Assessment of Digitalization Transformation in Supply Chain Management †

László Buics Ngoc Quynh Tran Nguyen

Publication Name: Engineering Proceedings

Publication Date: 2025-01-01

Volume: 113

Issue: 1

Page Range: Unknown

Description:

The rise of Industry 4.0 has made digital transformation a critical element of modern supply chain management, offering organizations a pathway to competitive advantage. While the prior literature has examined aspects of digitalization, few studies present a comprehensive view of the transformation process through to its practical application. This study proposes and aims to validate a digital transformation model developed by the author, based on a systematic literature review of 284 articles from Scopus and Web of Science. The model outlines a progression from data management to the integration of enabling technologies, culminating in enhanced supply chain decision-making. It introduces three key metrics—readiness, adoption, and Digital Maturity—to guide companies through distinct stages of transformation. Validation will be conducted using a mixed-methods approach, combining expert interviews and a quantitative survey with SCM professionals. This study offers both a theoretical framework and practical roadmap to support organizations in evolving their digital transformation strategies.

Open Access: Yes

DOI: 10.3390/engproc2025113064

Preface

María Eugenia Cornejo Istvan A. Harmati Laszlo T. Koczy Jesús Medina-Moreno

Publication Name: Studies in Computational Intelligence

Publication Date: 2023-01-01

Volume: 1040

Issue: Unknown

Page Range: v-ix

Description:

No description provided

Open Access: Yes

DOI: DOI not available