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Skanowanie laserowe stalowej konstrukcji elektrowni węglowej

Paczkowski Wiesław, Skibicki Szymon, Wróblewski Tomasz

Builder

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2020

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R.24, nr 4

22--25

PL

W pracy przedstawiono zastosowanie skaningu laserowego 3D jako uzupełniającego narzędzia oceny stanu technicznego złożonej stalowej konstrukcji szkieletowej modułu kotłowni elektrowni węglowej. W wyniku znacznego osiadania podłoża wystąpiły uszkodzenia konstrukcji obniżające jej poziom bezpieczeństwa. Do oceny stanu wytężenia i deformacji konstrukcji zastosowano ostatecznie analizę liniowo-sprężystą (LA) oraz analizę geometrycznie i materiałowo nieliniową (GMNA). Wykonano skaning laserowy 3D obejmujący prawie w całości wszystkie elementy konstrukcyjne występujące w modelu numerycznym. W ten sposób uzyskano informację dotyczącą geometrii oraz rzeczywistego stanu deformacji konstrukcji. W pracy porównano teoretyczny kształt deformacji słupów nośnych kotłowni z kształtem ustalonym na podstawie skaningu laserowego. Wprowadzono miarę zróżnicowania obu kształtów pozwalającą na ocenę stopnia ich zgodności.

EN

The paper presents the use of 3D laser scanning as a complementary tool for quality assessment of the steel skeletal structure of a coal power plant module. As a result of significant soil subsidence, structural damage occurred that reduced its safety level. Linear elastic analysis (LA) as well as geometrically and materially non-linear analysis (GMNA) were used to assess the state of stresses and deformations of the structure. 3D laser scanning was performed covering almost all of the structural elements appearing in the numerical model. In this way, information on the current structure geometry was obtained, which allowed for a series of comparative analyses. The work summarizes the theoretical state of displacements of the columns with the state established by laser scanning. A measure of the dissimilarity of both shapes was introduced to assess the credibility of the analyzed data.

2

Stress and deformation analysis of clamped functionally graded rotating disks with variable thickness

Thawait Amit K., Sondhi Lakshman, Sanyal Shubhashis, Bhowmick Shubhankar

Mechanics and Mechanical Engineering

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2019

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Vol. 23, nr 1

202--211

EN

The present study reports the linear elastic analysis of variable thickness functionally graded rotating disks. Disk material is graded radially by varying the volume fraction ratios of the constituent components. Three types of distribution laws, namely power law, exponential law and Mori-Tanaka scheme are considered on a concave thickness profile rotating disk, and the resulting deformation and stresses are evaluated for clamped-free boundary condition. The investigation is carried out using element based grading of material properties on the discretized elements. The effect of grading on deformation and stresses is investigated for each type of material distribution law. Further, a comparison is made between different types of distributions. The results obtained show that in a rotating disk, the deformation and stress fields can be controlled by the distribution law and grading parameter n of the volume fraction ratio.

3

An investigation of stresses and deformation states of clamped rotating functionally graded disks

Thawait A. K., Sondhi L., Sanyal S., Bhowmick S.

Journal of Theoretical and Applied Mechanics

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2017

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Vol. 55 nr 1

189--198

EN

The present study deals with the linear elastic analysis of variable thickness rotating disks made of functionally graded materials (FGMs) by the finite element method. The disks have radially varying material properties according to an exponential law, which is achieved by the element based grading of the material properties on the meshed domain. The results are reported for three types of thickness profiles, namely, uniform, linearly varying and concave thickness, having their mass constant. The disks are subjected to the clamped boundary condition at the inner surface and the free boundary condition at the outer surface. The obtained results show that in a variable thickness rotating disk, deformation and stresses are less as compared to the uniform thickness disk.