METHOD TO DETERMINE WEAR OF SLIDING BEARING SHELL Russian patent published in 2003 - IPC

FIELD: mechanical engineering; diagnosing condition of friction units. SUBSTANCE: invention relates to checking of wear of sliding bearing shells in process of operation. According to proposed method, amplitude A measured in mV, and duration S of discrete signals of acoustic emission expressed by oscillation number are recorded at constant shaft speed in process of friction. Using parameters, thus found, wear of shell is determined by formula m = m₀+k_MEE_AЭ, where m₀ and k_ME are parameters found at preliminary laboratory tests for friction at speed corresponding to speed of sliding of bearing contact surfaces, and E_AЭ is energy of acoustic emission connected with process of separation of wear particles. Value of acoustic emission energy E_AЭ is determined as summary energy of only those acoustic emission signals which satisfy condition S/A>0,2 mB^-1, with provision of maximum correlation of summary energy of acoustic emission with value of wear. EFFECT: simplified criterium of discrimination of acoustic emission signals connected with destruction and wearing of friction surfaces, reduced time taken for analysis, improved reliability of results of checking. 2 dwg