Transient heat convection analysis of a single rod in air cross-flow

Cabezas, Sebastian; Hegedűs, György; Bencs, Péter

doi:10.1556/606.2023.00768

Cited by 2 publications

(1 citation statement)

References 11 publications

(29 reference statements)

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“…In an additional area of research, finite element tests of a 2D cross-section are carried out for the analysis of 3D cylindrical industrial facilities and the physical phenomena occurring in them, for example also in thermal models prepared for individual industrial applications. In a lumped heat capacity model prepared for transient heat convection analysis in cross-air flow, the Finite Element Analysis simulations used with the ANSYS Fluent code are also performed in 2D sections, the results of which also show that the geometric shape of the 2D section has a clear effect on heat loss as well [11].…”

Section: Introductionmentioning

confidence: 99%

Challenges of Engineering Applications of Descriptive Geometry

Balajti

2023

Symmetry

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Descriptive geometry has indispensable applications in many engineering activities. A summary of these is provided in the first chapter of this paper, preceded by a brief introduction into the methods of representation and mathematical recognition related to our research area, such as projection perpendicular to a single plane, projection images created by perpendicular projection onto two mutually perpendicular image planes, but placed on one plane, including the research of curves and movements, visual representation and perception relying on a mathematical approach, and studies on toothed driving pairs and tool geometry in order to place the development presented here among them. As a result of the continuous variability of the technological environment according to various optimization aspects, the engineering activities must also be continuously adapted to the changes, for which an appropriate approach and formulation are required from the practitioners of descriptive geometry, and can even lead to improvement in the field of descriptive geometry. The imaging procedures are always based on the methods and theorems of descriptive geometry. Our aim was to examine the spatial variation in the wear of the tool edge and the machining of the components of toothed drive pairs using two cameras. Resolving contradictions in spatial geometry reconstruction research is a constant challenge, to which a possible answer in many cases is the searching for the right projection direction, and positioning cameras appropriately. A special method of enumerating the possible infinite viewpoints for the reconstruction of tool surface edge curves is presented in the second part of this paper. In the case of the monitoring the shape geometry, taking into account the interchangeability of the projection directions, i.e., the property of symmetry, all images made from two perpendicular directions were taken into account. The procedure for determining the correct directions in a mathematically exact way is also presented through examples. A new criterion was formulated for the tested tooth edge of the hob to take into account the shading of the tooth next to it. The analysis and some of the results of the Monge mapping, suitable for the solution of a mechanical engineering task to be solved in a specific technical environment, namely defining the conditions for camera placements that ensure reconstructibility are also presented. Taking physical shadowing into account, conclusions can be drawn about the degree of distortion of the machined surface from the spatial deformation of the edge curve of the tool reconstructed with correctly positioned cameras.

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Section: Introductionmentioning

confidence: 99%

Challenges of Engineering Applications of Descriptive Geometry

Balajti

2023

Symmetry

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Thermal Model of a Ball Bearing using the State-Space approach and Light Gray-Box Lumped Parameter Thermal Network

Cabezas,

Tóth,

Hegedűs

et al. 2023

MATEC Web Conf.

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In this paper, a thermal model of a ball bearing subjected to radial loads is presented. By the application of the State-Space approach and the Light Gray-Box lumped parameter thermal network, the temperature of the inner components of a ball bearing, these are: outer-race To; balls Tb and inner-race Ti; and the temperature of the housing Th were determined. The relation between the external force, rotational speed, lubrication type, were investigated for the purpose of determining the total frictional moment Mf that occurs among the elements comprising the ball bearing. Subsequently, the total heat losses Qf were calculated together with the heat distribution along the elements of the ball bearing. The analytical results were validated experimentally. It could be seen that the standard deviation of temperature between the thermal model and the experimental measurements over the outer-race To and housing Th were sd = 5.06 % and sd = 0.33 % . Moreover, the temperature of the balls Tb and the inner-race Ti were predicted. In this context, the results show good agreement with real data, therefore, the thermal model can be utilized to foresee the thermal behavior of bearings with similar geometry that undergo effects of radial loads.

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Transient heat convection analysis of a single rod in air cross-flow

Cited by 2 publications

References 11 publications

Challenges of Engineering Applications of Descriptive Geometry

Challenges of Engineering Applications of Descriptive Geometry

Thermal Model of a Ball Bearing using the State-Space approach and Light Gray-Box Lumped Parameter Thermal Network

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