tailieunhanh - Rolling Bearing Damage 2009 Part 2

Tham khảo tài liệu 'rolling bearing damage 2009 part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Unusual operating behaviour indicating damage Bearing monitoring with technical devices Damage in certain spots Should bearing damage be restricted to specific locations such as indentations caused by rolling elements standstill corrosion or fractures it can be recognised at the earliest with vibration measurements. Shock waves which originate from the cycling of local indentations can be recorded by means of path speed and acceleration pick-ups. These signals can be processed further at little or great expense depending on the operating conditions and the accuracy of the expected confidence factor. The most common are measuring effective value measuring shock value signal analysis by envelope detection. Experience has shown that the latter procedure is particularly reliable and practical in use. The damaged bearing components can even be pinpointed with a special type of signal processing figs. 5 and 6. Please refer to our TI No. WL 80-36 Rolling Bearing Diagnosis with the FAG Bearing Analyser for more information. 5 Frequency spectrum of envelope signal between 0 and 200 Hz below undamaged bearing above damaged bearing nIR Inner ring speed min-1 fIR Frequency of inner ring signal cycling frequency Hz 7 March of temperature and shock value as a function of time stopping lubrication. Spindle bearing P C n 9000 min-1 Lubricating oil ISO VG100. 6 Inner ring damage to a spherical roller bearing in a paper making machine found by means of the envelope detection procedure. FAG I 6 Unusual operating behaviour indicating damage Bearing monitoring with technical devices Urgency of bearing exchange The vibration measuring procedures are very suitable for detecting fatigue damage. It is easiest with bearings with point contact ball bearings and with more sophisticated evaluation procedures such as envelope detection for example damage to roller bearings is found just as reliably. They are less suitable however for observing the lubrication condition. A .