TY JOUR TI Model-based study of non-destructive testing for rolling stock wheelset axles KW non-destructive testing KW magnetic particle inspection KW railway axle KW magnetostatic modelling KW magnetic flux leakage field KW surface defects KW finite element method KW magnetic induction KW machine vision JO Bulletin of scientific research results AU Shen', C.. AU Caplin, A.E. PY 2026 IS 2026 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"