TY JOUR TI COMPARATIVE ANALYSIS OF USING COUPLING FLUIDS IN FLAW DETECTION ON THE EXAMPLE OF ULTRA-SOUND CONTROL OF AN ALL-ROLLED WHEEL SURFACE KW fluid KW viscosity KW ultrasonic control KW wheelset KW piezoelectric transducer KW sensitivity KW control JO Transport engineering AU Otoka, A.G. AU Holodilov, O.V. PY 2024 IS 2024 PB Bryansk State Technical University