METHOD OF DETERMINING COEFFICIENT OF PROPORTIONALITY Russian patent published in 2024 - IPC B61K9/08 E01B35/00 

FIELD: rail vehicles.

SUBSTANCE: invention relates to the field of monitoring the state of railway tracks, in particular, to non-destructive methods of monitoring the stressed state of sections of rail strings. According to method for determining the proportionality coefficient, the first measurement of the root-mean-square amplitude of Barkhausen noise (RMS₁, V) is carried out to determine strains in a rail string. and temperature (T₁, °C) at a given point of the rail, then a second measurement of the root-mean-square amplitude of the Barkhausen noise (RMS₂, V) and the rail temperature (T₂, °C) at a given point on the rail. Further, coefficient of proportionality is determined depending on mean-square amplitude of Barkhausen noise on voltage K=(RMS₁ − RMS₂)/(σ₁ − σ₂), where σ₁ (MPa) = α × E × (T_otf – T₁), and σ₂ (MPa) = α × E × (T_otf – T₂), where K (V/MPa) is a coefficient of proportionality for determining stresses in a rail string, T_otf (°C) is optimum temperature of fixing rail string, α (1/°C) is the coefficient of linear thermal expansion of the rail material, E (MPa) is the modulus of elasticity of the rail material. Measurement of temperatures T₁ and T₂ is carried out under condition T₁#T₂.

EFFECT: reduced measurement error, increased reliability of control results.

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