METHOD OF DETERMINING THERMAL RESISTANCE OF SECTION OF STRUCTURAL ELEMENT IN NONSTEADY HEAT-TRANSFER MODE

摘要

FIELD: physics.;SUBSTANCE: essence of the invention lies in determining conditions for existence of a quasi-steady heat-transfer mode and criterion θ_max thereof. Based on defined quasi-steady mode conditions for a specific section, the duration of the measurement time interval τ^min is selected depending on the heat retention time of the section τⁱⁿ and the overall duration of the measurement time interval τ≥τ^min≥3τ_in. The limiting value of the quasi-steadiness criterion θ is determined. Time intervals τ_i are arbitrarily selected and from the set of values (τ_i), those time intervals τ _ij, where the quasi-steadiness criterion θ(τ_i) is less than θ, are selected. These time intervals τ _ij will be closer to steady. The non-steady mode which is difficult to diagnose and calculate is excluded and the known steady method can be used when determining thermal resistance of the section of the structure.;EFFECT: higher accuracy of determination.;2 dwg, 2 tbl