Kâroly Jármai
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View article: Dimensional and Numerical Approach to Heat Transfer in Structural Elements with a Symmetrical Cross Section
Dimensional and Numerical Approach to Heat Transfer in Structural Elements with a Symmetrical Cross Section Open
The structures of buildings employ elements with symmetrical cross sections (columns have two axes of symmetry, and connecting beams have at least one), leading to symmetrical states of stress and deformation under the action of mechanical…
View article: Frequency Response Optimization of an Industrial Robot Arm
Frequency Response Optimization of an Industrial Robot Arm Open
This study contributes to the development of more resilient and responsive control systems for industrial robotics. Industrial robot arms are subject to various vibrational forces during various operations, which can limit their accuracy a…
View article: Optimization of Springback and Thinning during the Deep Drawing Process Based on an Optimization Strategy
Optimization of Springback and Thinning during the Deep Drawing Process Based on an Optimization Strategy Open
During forming the process, various geometric parameters play an important role in determining the amount of the springback. These parameters can include factors such as sheet thickness, friction coefficient, and the radii of the dies. Fur…
View article: Electrical Transients in Industrial Facilities
Electrical Transients in Industrial Facilities Open
It is essential to protect control, regulation and data storage units used in automated robotic manufacturing from the consequences of harmful electrical grid harmonics. In this paper, the effectiveness of active/passive harmonic filters b…
View article: Comparison of Different Water Tank Leg Cross Sections, when exposed to a Fire
Comparison of Different Water Tank Leg Cross Sections, when exposed to a Fire Open
The target of the investigation is a water tank with an internal volume of 1.5 m 3 .This pressure vessel is supported by legs.This study compares four different cross sections of the support, when exposed to fire.Different steel grades wer…
View article: Experimental Validation of Heat Propagation: Results of the Numerical Modelling for Real Scale Steel Structural Elements and Different Assigned Models, Subjected to Simulated Fire
Experimental Validation of Heat Propagation: Results of the Numerical Modelling for Real Scale Steel Structural Elements and Different Assigned Models, Subjected to Simulated Fire Open
Currently the fire protection problems for structural elements, is usually solved by means of the prototype-model correlations, established by means of dimensional methods.The authors, based on a reliable state-of-art analysis, established…
View article: A járműmérnök oktatás és képzés a miskolci egyetemen
A járműmérnök oktatás és képzés a miskolci egyetemen Open
The article describes the objectives of the automotive engineering BSc program launched in 2016, the professional competencies to be acquired, the subject structure taught, the specializations, and the community-building events and activit…
View article: Evolutionary control system of asymmetric quadcopter
Evolutionary control system of asymmetric quadcopter Open
Drones, specifically quadcopters, have increased in importance during the last years due to their wide range of applications, from civil applications to military employment. One of the most important issues in quadcopters is the efficient …
View article: Comparative study of different meta-heuristics on optimal design of a heat exchanger
Comparative study of different meta-heuristics on optimal design of a heat exchanger Open
The paper compares different metaheuristics for using heat exchangers as a benchmark to estimate the best design parameter values using optimization efficient algorithms. Many MATLAB algorithms are used in this study. Also, an engineering …
View article: Modern Dimensional Analysis Based on Fire-Protected Steel Members’ Analysis Using Multiple Experiments
Modern Dimensional Analysis Based on Fire-Protected Steel Members’ Analysis Using Multiple Experiments Open
Nowadays, the real structures (considered as prototypes) subjected to fire are analysed by means of the behaviours of some reduced scale structures (defined as models). These prototype–model correlations are governed by the so-called dimen…
View article: Modern Dimensional Analysis-Based Steel Column Heat Transfer Evaluation Using Multiple Experiments
Modern Dimensional Analysis-Based Steel Column Heat Transfer Evaluation Using Multiple Experiments Open
In order to foresee the response during the fire of a real symmetrical structure (prototype), nowadays engineers apply methods which involve the associated reduced-scale model’s behaviors, mainly dimensional analysis behaviors. Between the…
View article: Experimental and Numerical Studies of the Heat Transfer in Thin-Walled Rectangular Tubes under Fire
Experimental and Numerical Studies of the Heat Transfer in Thin-Walled Rectangular Tubes under Fire Open
The paper studies, experimentally and numerically, the fire behavior of some structural elements of symmetric-tubular (rectangular in this study) shapes using modern dimensional analysis (MDA). A model at a certain scale of the real protot…
View article: An Investigation on the Features of Deformation and Residual Stress Generated by Patch Welding with Different Plate Sizes
An Investigation on the Features of Deformation and Residual Stress Generated by Patch Welding with Different Plate Sizes Open
Welding is widely used to manufacture and repair steel structures such as piping and pressure vessels. Welding induces deformation and residual stress, which influences the mechanical performance of the structural members. Noting patch wel…
View article: Combining evolutionary optimization with finite element method for optimizing transmission-line tower
Combining evolutionary optimization with finite element method for optimizing transmission-line tower Open
Metaheuristic evolutionary methods are powerful tools for solving non-linear, many dimensional optimisation problems. In this article, one of these methods is combined with finite element method for optimising truss like structure. The adv…
View article: Comparison of optimized steel frame structures
Comparison of optimized steel frame structures Open
Frame structures are defined as structures built of straight, less often curved bars, which are dimensioned to carry a planar or spatial load. These frames are generally considered statically indeterminate structures so that several method…
View article: Optimization of tubular columns prestressed by tension ties
Optimization of tubular columns prestressed by tension ties Open
In the design of prestressed columns the effect of initial imperfections has been predominantly neglected in the past. The design of tubular columns prestressed by wire ropes is treated now on the basis of the European column buckling form…
View article: Modern Method to Analyze the Heat Transfer in a Symmetric Metallic Beam with Hole
Modern Method to Analyze the Heat Transfer in a Symmetric Metallic Beam with Hole Open
The paper aims to use Modern Dimensional Analysis to study the heat transmission through a rectangular bar with a hole. The problem is very important for monitoring a structure, made of such bars, to protect it from fire. The original part…
View article: Fire safety design of pressure vessels
Fire safety design of pressure vessels Open
A calculation of welded pressure vessels for fire safety is shown in this paper. At the first step, the temperature of the steel walls has been investigated, and the inner liquid pressure and the temperature increase. It is assumed that th…
View article: Evolutionary optimization of a transmission line tower with FPA algorithm
Evolutionary optimization of a transmission line tower with FPA algorithm Open
The optimization of the pylon is shown in this paper. The optimization is made by using flower pollination algorithm. The objective function is mass of the structure. The design constraints are static stress, local buckling and buckling. T…
View article: Fertilization optimization algorithm on CEC2015 and large scale problems
Fertilization optimization algorithm on CEC2015 and large scale problems Open
This work, presents a novel optimizer called fertilization optimization algorithm, which is based on levy flight and random search within a search space. It is a biologically inspired algorithm by the fertilization of the egg in reproducti…
View article: A Box-Girder Design Using Metaheuristic Algorithms and Mathematical Test Functions for Comparison
A Box-Girder Design Using Metaheuristic Algorithms and Mathematical Test Functions for Comparison Open
In engineering, metaheuristic algorithms have been used to solve complex optimization problems. This paper investigates and compares various algorithms. On one hand, the study seeks to ascertain the advantages and disadvantages of the newl…
View article: An Economical and Mechanical Investigation on Local Post-Weld Heat Treatment for Stiffened Steel Plates in Bridge Structures
An Economical and Mechanical Investigation on Local Post-Weld Heat Treatment for Stiffened Steel Plates in Bridge Structures Open
A heat treatment is effective for reducing the residual stress of the welded structures. A post-weld heat treatment (PWHT) requires a large heating apparatus (furnace). It requires a high energy, a long time, and a high cost. For examining…
View article: Optimization of a Totally Fiber-Reinforced Plastic Composite Sandwich Construction of Helicopter Floor for Weight Saving, Fuel Saving and Higher Safety
Optimization of a Totally Fiber-Reinforced Plastic Composite Sandwich Construction of Helicopter Floor for Weight Saving, Fuel Saving and Higher Safety Open
The application of fiber-reinforced plastic (FRP) composites as structural elements of air vehicles provides weight saving, which results in a reduction in fuel consumption, fuel cost, and air pollution, and a higher speed. The goal of thi…
View article: Optimization of asymmetric I-beams for minimum welding shrinkage
Optimization of asymmetric I-beams for minimum welding shrinkage Open
A calculation system has been developed to determine the optimum dimensions of asymmetric I-beams for minimum shrinkage. The objective function is the minimum mass; the unknowns are the I-beam dimensions; the constraints are the stress, lo…
View article: GPU based parallel optimization of members of a truck floor
GPU based parallel optimization of members of a truck floor Open
Grillage - formally lattice - structures are made of longitudinal beams and cross members. Grillages can model vehicle frames, bus floor frames or an entire vehicle. The optimization of the cross members of this structure is shown in this …
View article: Optimal Design of a Fiber-Reinforced Plastic Composite Sandwich Structure for the Base Plate of Aircraft Pallets In Order to Reduce Weight
Optimal Design of a Fiber-Reinforced Plastic Composite Sandwich Structure for the Base Plate of Aircraft Pallets In Order to Reduce Weight Open
The application of fiber-reinforced plastic (FRP) composite materials instead of metals, due to the low density of FRP materials, results in weight savings in the base plates of aircraft pallets. Lower weight leads to lower fuel consumptio…
View article: Improving optimization using adaptive algorithms
Improving optimization using adaptive algorithms Open
In the research projects and industrial projects severe optimization problems can be met, where the number of variables is high, there are a lot of constraints, and they are highly nonlinear and mostly discrete issues, where the running ti…
View article: Optimum Design of an Air Tank for Fatigue and Fire Load
Optimum Design of an Air Tank for Fatigue and Fire Load Open
Pneumatic pressure vessels, or more commonly used names, air tanks, are used for storing compressed air to operate different pneumatic tools, for example, wrenches, grinders, sanders and others.The objective of design optimization of air t…
View article: A new method to predict temperature distribution on a tube at constant heat flux
A new method to predict temperature distribution on a tube at constant heat flux Open
Surface temperature distribution on a tube is one of the main factors affecting the calculation of the heat transfer coefficient calculation. When an electric heater heats the tube, a magnetic flux is generated that affects the thermocoupl…