Control of a test bench in simulation of physical disturbances

Influence Pulse Duration Methodical Error of Determination of Thermal Translucent Materials Laser Flash Method

“…It is known [5] that the inclusion of the possibility of spatial nature of the process of thermal conductivity leads only to increase methodological errors as compared to the one-dimensional heat transfer model. Accordingly, in the present work values are likely to lower (minimum) limit of determination errors.…”

“…These factors include the thickness of the samples, the shape and size of the laser heating, heat transfer from the surfaces of the specimen, the spatial nature of heat transfer, thermal conductivity of the material, its porosity and translucency [3][4][5][6][7]. It was also found that the value of the error in determining whether TPC metals depend on the duration of the impulse [3].…”

“…The greatest interest in solving these problems is the laser flash method, which is based on the simple implementation of the experimental method and the approximate solution of one-dimensional heat conduction problems [1][2]. Set group of factors [3][4][5][6][7], affecting the value of methodological errors in the determination of thermal characteristics (TPC) materials by laser flash [1].…”

“…The error was established by comparing the reference values of TPC to certain material as described in [3][4][5][6][7] in numerical modeling of heat transfer in the sample under conditions corresponding to the experiment.…”

Errors in Determining the Thermal Characteristics of Liquids by the Laser-Pulse Method

“…Problem (2)-(10) belongs to the category of singularly perturbed problems [20]. This problem is more complicated those problems in [14][15][16]. The main difficulty of this task is the necessity of solving a system of three heat equations with a significant (hundreds of times) difference of materials heat diffusion of each layer.…”