Miroslav Trcala

Miroslav Trcala
Mendel University in Brno · Department of Wood Science

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23
Publications
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114
Citations

Publications

Publications (23)
Conference Paper
The paper deals with complex nonlinear time-dependent material models used in a structure exposed to fast dynamic loading. The finite element solution with the use of the explicit method for the direct integration of equations of motion is provided. Two material models suitable for description of nonlinear response of structure to dynamic loading w...
Article
Full-text available
The aim of this study was to create a reinforced composite wood-based panel that would be leaned towards the environment Plywood was used as a core material and fiber-reinforced polymer was used as a reinforcement. Conventional resin for the fiber-reinforced polymer was substituted with polyvinyl acetate (PVAC), which has several advantages, such a...
Article
Full-text available
Finite element simulations of coupled thermal and moisture fields in wood during kiln drying were observed with a focus on non-isothermal moisture transfer in three-dimensional orthotropic models of wood with an initial moisture content below the fiber saturation point. Four different unsteady-state numerical models of the drying process were compa...
Conference Paper
The utilization of nonlinear material models within numerical simulation of response of concrete structures moves the numerical methods closer to the reality. Nevertheless, the use of these models is still not common in the engineering practice. The mistrust may lies in relative complexity of a background theory. The proposed article, which is abou...
Article
This article introduces a new “linear heat balance (LHB) method” that is based on exact (physically correct) equation analytically derived from fundamental conduction–convection heat transfer equation. Therefore, the aim of this paper is to derive and analyze a new heat balance equation for sap flow calculation from measured temperature differences...
Article
Full-text available
The standard formula for geometric stiffness matrix calculation, which is convenient for most engineering applications, is seen to be unsatisfactory for large strains because of poor accuracy, low convergence rate, and stability. For very large compressions, the tangent stiffness in the direction of the compression can even become negative, which c...
Article
This paper deals with the analytical and experimental analysis of heat transfer in the xylem of trees and the determination of stem water content (WC). The aim of this paper was to derive and verify a new approach to WC calculation from measured temperature differences around a continuously heated needle. The configuration of heater and thermocoupl...
Article
Aims The study was focused on comparing the results of the three instrumental methods applied simultaneously for root studies in several tree species representing contrasting situations: root systems of different structure and stems of a wide range of diameters (especially when considering their resistivity). We want to learn properties of the meth...
Article
This paper deals with the stochastic numerical analysis of moisture transfer in wood with the random diffusion coefficient after heating of wood (when temperature is already constant). The simulation is based on the unsteady-state nonlinear (the model respects the dependence of diffusion coefficients on moisture and constant temperature) diffusion...
Article
This illustrated review is aimed to provide succinct account of different methods applicable for obtaining objective information about the functional ecology of forest sites and stands (and also, e.g., orchards, watersheds, parks or alleys) for the purposes of phytotechnology or precise forestry. Management strategies must consider preservation of...
Conference Paper
Water flow represents the biggest energy flow in vegetation which also causes its magnificent climatic effect. From all the water taken up by plants, the majority is transpired, leading to leaf cooling (associated with the heat of vaporization) and only minor amounts of water are consumed by all the other processes (such as photosynthesis transport...
Article
This paper deals with the numerical solution of a three-dimensional model of nonstationary nonlinear heat transfer in the sapwood of trees during sap flow measurement by a thermodynamic method based on volumetric heating of a stem segment (Trunk Heat Balance – THB – method). The model respects the dependence of physical properties on temperature an...
Article
Numerical analysis of temperature profiles during thermal modification of wood was carried out. The numerical solution – based on finite element analysis, FEA – of the 3D problem of transient nonlinear heat transfer model is presented for wood as a typical anisotropic material. The numerical model was enhanced for describing chemical reactions of c...
Article
Full-text available
Timber is one of the most used materials for roofing of ice arena because of its very good mechanical properties and low weight. High relative humidity of internal air, low temperature and ice rink presence, which cause fall of surface temperatures of constructions under the dew point due to radiation, are risky factors not only from structural poi...
Article
This paper deals with the theoretical analysis, numerical simulations and experimental measurements of temperature field for sap flow calculation based on xylem volume heating and is focused on the improvement of the trunk heat balance (THB) method. This method has been successfully applied for many years in different field conditions and tree spec...
Article
This paper deals with the numerical solution of a three-dimensional problem of non-isothermal moisture transfer in the anisotropic structure of wood and corresponding wood deformations in convective drying.The simulation is based on the unsteady-state nonlinear diffusion of moisture and heat with respect to the orthotropic nature of wood. The moist...
Article
There are many different methods for sap flow measurement. Quantitative output of such methods is a precondition of their application. However it is not easy to quantify, if not all needed input parameters are known. Heat conductivity is one of them. Introducing a constant value into corresponding equations has usually solved this problem, although...
Article
This paper deals with the numerical simulation of 3D heat and moisture transfer in wood. The appropriate mathematical model is based on a set of coupled heat and mass transfer equations. The main contributions of this paper are: first, the transformation relations between matrixes of material coefficients (diffusion and thermal conductivity coeffic...

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