| ABSTRACT: | THERMAL NONDESTRUCTIVE TESTING OF THE BUILDINGS IN PRACTICE
O.V. Lebedev, V.G. Avramenko, E.V. Abramova and O.N. Budadin
Technological institute of energetic investigations, diagnostic and nondestructive testing "WEMO",
Moscow, Russia
The aim of thermal nondestructive testing is to define thermalphysical characteristics of controlled
objects during the maintenance using the direct observations. Solution of this problem consists of two parts –
the experimental (using IR camera and temperature sensors) and theoretical ones (using input experimental
data from sensors in the simulation software).
The first part of the calculation is the determination of the local thermalphysic parameters in the fixed
zones. Using time series from temperature sensors as the input data we need to solve the inverse problem of
nonstationary heat conductivity equation. The solution of inverse problem of thermal heat conductivity is
depended on the solution of the direct problem of thermal heat conductivity in the following way: it is
necessary to select parameters of the investigated objects so that its calculated reaction is close as far as
possible to its measured reaction. The reaction which consists of root-mean square deviation of experimental
and theoretical temperature time series is minimized.
The second part of the calculation is the transformation of the local thermalphysic parameters in the
fixed zones to the global thermalphysic parameters of the whole building using spatial distribution of
temperature field from thermogrammes.
The quality of buildings and construction structures (more than 200 civil and industrial buildings) is
completed by request of Moscow Government. Corresponding methods have been certified by “State
Standard” and agreed with Department of Power Engineering of Russian Federation and “State City
Technical Supervision”.
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