Evolutionary identification method for determining thermophysical parameters of hardening concrete

Długosz, Adam; Pokorska, I.; Jaskulski, Roman; Glinicki, Michał A.

doi:10.1007/s43452-020-00154-7

Cited by 7 publications

(1 citation statement)

References 39 publications

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“…In the case of foam concrete, the air volume is related to the mixture composition and has an impact on thermal properties. The authors of the papers [ 13 , 14 , 15 ] presented the complex investigation of the thermo-mechanical behavior of cement concrete. For this purpose, the authors used traditional heating elements and numerical methods to describe the thermal parameters.…”

Section: Introductionmentioning

confidence: 99%

Thermal Diffusivity of Concrete Samples Assessment Using a Solar Simulator

et al. 2023

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The thermal properties of pavement layers made of concrete with varying bulk densities are a particularly interesting topic in the context of development road technologies. If a hybrid layer system is used as a starting point, with thin asphalt layers (from 1 cm to 4 cm) laid on top of a foam concrete layer, thermal properties begin to play a crucial role. The main research problem was to create a test method enabling the assessment of the influence of solar heating on the thermal parameters of the building material, especially cement concrete. For this reason, this paper is concerned specifically with the assessment of a new methodology for testing and calculating the value of the thermal diffusivity coefficient of samples made of concrete varying bulk densities. In this case, using the proprietary concept the authors built a solar simulator using a multi-source lighting system. The analysis of the results of laboratory tests and numerical analyses allowed the authors to observe that there is a strong correlation between the bulk density of samples heated and the thermal diffusivity parameter, which appears in the unidirectional heat transfer equation. The strength of this relationship has been expressed with the coefficient of determination and amounts to 99%. The calculated values of the coefficient of thermal diffusivity for samples made of foam concrete range from 0.16×10−6m2s to 0.52×10−6m2s and are lower (from 2.5 to 8 times) than the value determined for samples made of typical cement concrete.

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Section: Introductionmentioning

confidence: 99%

Thermal Diffusivity of Concrete Samples Assessment Using a Solar Simulator

et al. 2023

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Optimal design of selected features of exhaust system shields using different optimization methods and artificial neural networks

Długosz,

Jarosz

2024

Multiscale and Multidiscip. Model. Exp. and Des.

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The article presents problems related to methods of optimal design of heat shields used in exhaust systems of internal combustion engines. The optimization method proposed in this paper goes well beyond the scope of the standard design process. The paper uses a variety of local and global optimization algorithms, those both built into numerical simulation systems and in-house and external algorithms. An optimization criterion was defined and numerically implemented, together with constraints derived from the real requirements for this type of shielding. A simplified numerical model of finite element method providing the required accuracy adapted to the optimization task was developed. In addition, the work also presents a method for creating finite element surrogate models using artificial neural networks. The process of selecting the network topology and its learning allowed the development of a metamodel characterized by very good quality, for which, despite the relatively large number of design variables, the response errors are completely acceptable from a practical point of view. Numerical results were compared and developed for the used methods and algorithms.

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