Investigation of the vibrations of roller bearings Features - assessment of bearing condition by vibration analysis - comparison of bearings with different faults Learning objectives/experiments - vibrational spectrum of the running noise of roller bearings - familiarisation with the envelope analysis - influence of damage to outer race, inner race or roller body, on the spectrum - estimating service lives of roller bearings - influence of the lubricant on the vibration spectrum - detection of faulty roller bearings - use of a computerised vibration analyser Specification [1] investigation of the vibrations of roller bearings [2] roller bearing with damage to outer race [3] roller bearing with damage to inner race [4] roller bearing with damage to a roller body [5] roller bearings with combined damage [6] long-running roller bearings [7] new and undamaged roller bearing [8] drive motor with variable speed via frequency converter [9] radial loading of bearings via adjustable loading device [10] vibration isolation of the foundation plate using rubber elements [11] instruments: optical speed sensor, acceleration sensor to record vibration [12] software features: 2-channel oscilloscope; 2-channel FFT analyser; envelope analysis; run-up curve and order analysis [13] software for data acquisition via USB under Windows 10 Technical data Pendulum ball bearing of type NU204-E-TVP2 - inside diameter: Ø=20mm - outside diameter: Ø=47mm - width: 14mm - number of rollers: 12 Drive motor - speed: 100...3000min-1 - power: 370W Acceleration sensor - frequency range: 1...10000Hz - sensitivity: 100mV/g - resonance frequency: 32kHz Optical speed sensor - sampling width: 3...150mm - laser class II, 675nm 230V, 50Hz, 1 phase 230V, 60Hz, 1 phase; 120V, 60Hz, 1 phase LxWxH: 510x200x330mm (experimental unit) LxWxH: 420x400x180mm (control unit) Weight: approx. 25kg (total)
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