TY JOUR TI ON NON-DESTRUCTIVE TESTING OF RECIPROCATING MACHINES KW piston machine KW non-destructive testing KW non-destructive testing method JO Modern Technologies and Scientific and Technological Progress AU El'hutov, S.N. AU Zorin, N.V. AU Nechaeva, A.V. PY 2026 IS 2026 PB Federal State Funded Educational Establishment of Higher Education «Angarsk State Technical University»