TY JOUR TI PRODUCT QUALITY AT DESIGN STAGE KW tribo-system KW designing KW product quality KW tribology KW friction unit KW wear JO Bulletin of Bryansk state technical university AU Tikhomirov, V.P. AU Izmerov, M.A. AU Shalygin, M.G. PY 2020 IS 2020 PB Bryansk State Technical University