Балансировочные машины SCHENCK серии Smart Balancer - страница 4

Detection of machine resonances: The bump test: The guarantee of accurate balancing Take sources of danger out of the game at an early stage Resonances in the system can be determined by the With the bump test, you determine the natural frequencies measurement and graphic display of the amplitude and of a structure. With a rotating machine, you determine the phase angle of the rotational vibrations as a function of speed ranges in which vibrations are amplified dispropor- the speed. This ensures dedicated balancing outside ma- tionately by resonance. chine resonances. mm/s inch/s DIN ISO 10816: 11,00 0,43 Mechanical vibrations – D 7,10 0,28 assessment of the vibra- 4,50 0,18 tions of machine through C 3,50 0,14 measurements on no 2,80 0,11 rotating parts B 2,30 0,09 Vibration velocity (rms) 1,40 0,06 10-1000 Hz, n > 600 min-1 A 0,71 0,03 2-1000 Hz, n > 120 min-1 rigid flexible rigid flexible rigid flexible rigid flexible Foundation Pumps radial, axial, mixed flow med. sized mach. large machines P > 15 kW 15 kW < P <_ 300 kW 300 kW < P < 50 MW integrated driver external driver Motors Motors Machine type 160 <_ H < 315 mm 315 mm <_ H Group 4 Group 3 Group 2 Group 1 Group A = new machine condition; B = unlimited long-term operation allowable; C = short-term operation allowable; D = Vibration causes damage