Wyniki 1-3 spośród 3 dla zapytania: authorDesc:"Maciej PAŃCZYK"

Concept of mapped Infinite Elements incorporated into Boundary Element Method

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Incorporation of Infinite Elements into Boundary Element Method (BEM) requires to introduce special mapping functions or combination of standard shape function and decay functions for infinite region. The concept of mapped infinite elements usage and their implication for calculation steps in BEM will be presented. Results will be illustrated by two-dimensional example. It is to clarify the appl[...]

3D mapped infinite boundary elements usage in Electrical Impedance Tomography

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Infinite Boundary Elements in Boundary Element Method can be used to solve forward problem in Electrical Impedance Tomography. Iinfinite elements are applied e.g. into wall dampness investigations when the height of moisture and implicated proper electrode placement is unknown or on medical areas when some surfaces between human tissues and related boundary conditions are inaccessible. This article presents implementations of mapped infinite elements based on eight nodes quadrilateral boundary elements in 3 dimensional verification model. Streszczenie. Elementy brzegowe nieskończone w Metodzie Elementów Brzegowych mogą być stosowane do rozwiązywania zadania prostego w zagadnieniach tomografii impedancyjnej. Przykładowo w pomiarach zawilgocenia murów lub w zagadnieniach medycznych gdzi[...]

Boundary element method application in wall dampness tomography DOI:10.15199/48.2016.03.23

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The boundary element method implementation used to find tomographic image of damped wall humidity distribution is presented. Damped wall represents non-homogeneous media where humidity has a spatial distribution that varies with two co-ordinates. Real measurements were taken and function coefficients where found using boundary element method, verified again by finite element method. Streszczenie. Artykuł prezentuje opis matematyczny implementacji środowisk niejednorodnych w metodzie elementów brzegowych zastosowanej do poszukiwania rozkładu zawilgocenia wnętrza muru. Wyniki obliczeń porównane są z realnymi pomiarami zawilgocenia zbudowanego w warunkach laboratoryjnych muru, wykonanymi z użyciem 26 elektrodowego tomografu impedancyjnego (Zastosowanie metody elementów brzegowych dla środowisk niejednorodnych na przykładzie badania zawilgocenia murów). Keywords: Boundary Element Method, Functionally Graded Materials, Impedance Tomography. Słowa kluczowe: Metoda elementów brzegowych, środowiska niejednorodne, tomografia impedancyjna. Introduction Serious problem form many brick masonry historic buildings are their excessive moisture. Too much moisture causes a reduction in the compressive strength of both brick and mortar and to reduce the durability of the walls. Water, usually containing aggressive chemicals (chlorides, sulfates and nitrates), is transmitted to higher altitudes of the wall. High humidity of the walls encourages growth of fungi and mold, which have a negative impact on the human health. Humidity distribution, the type and concentration of salt in the wall are helpful in assessing the causes of damage and should be the basis for selecting the appropriate security methods related to excessive humidity and salinity. Typical method used to find humidity distribution performed by drilling, sampling and checking samples moisture cannot be applied for continuous monitoring of dehumidification process. Relatively inexpensive[...]

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