HAUST-LDV-bearing-dataset: Vibration signals of rolling bearings under multiple fault types acquired by non-contact laser Doppler vibrometry
Description
Data acquisition platform We constructed a HAUST-LDV-bearing-dataset including diverse fault types on a precision vibration measurement platform. The test bearing is a deep groove ball bearing 6206. The platform, manufactured by SKF Österreich AG, consists of an AC motor, a spindle system, a pneumatic loading system, a laser vibrometer, and a measurement and evaluation electronic unit. The axial and radial loading ranges are 30–200 N and 80–400 N, respectively, applied to the test bearing outer ring by the pneumatic loading system and two cylinders; the rotational speed is set and adjusted by the AC motor speed controller. The vibration measurement sensor is a laser Doppler vibrometer (LDV), model Polytec MSL-7100, manufactured by Polytec GmbH. After calibration, the vibration measurement error of the entire system is ±0.5 μm/s at the mid-frequency band of 570 Hz and a reference amplitude of 100 μm/s; the measured rotational speed at the nominal value of 1800 rpm is 1804 rpm, corresponding to a speed error of 0.22%. Non-contact measurement principle The LDV performs non-contact measurement of the radial vibration of the bearing outer ring based on the heterodyne interference principle. A He-Ne laser beam is directed onto the surface of the outer ring, and the Doppler effect shifts the frequency of the backscattered light. The frequency-modulated signal Δf(t) is captured by the optical receiver and subsequently processed by a digital velocity decoder to extract the instantaneous velocity v(t) = ds(t)/dt from the instantaneous frequency deviation, where ds(t) denotes the instantaneous displacement. The decoded signal is then fed into a digital signal processor (DSP) equipped with an adaptive signal enhancement (ASE) filter to suppress noise and mitigate interference spikes caused by intermittent loss of the optical signal. The conditioned signal is finally converted by a D/A converter into an analog output voltage u(t) proportional to the radial vibration velocity of the bearing outer ring. After calibration, the expanded uncertainty of the LDV velocity measurement is 1% with a confidence level of approximately 95% and a coverage factor k = 2. Dataset composition The HAUST-LDV-bearing-dataset covers two load conditions: Load condition A (Axial 100 N, Radial 0 N): A-H (healthy), A-I02/A-I03/A-I05 (inner race pitting, 0.2/0.3/0.5 mm), A-O02/A-O03/A-O05 (outer race pitting, 0.2/0.3/0.5 mm), A-R05/A-R08/A-R10 (roller pitting, 0.5/0.8/1.0 mm) Load condition B (Axial 100 N, Radial 50 N): B-H (healthy), B-I02/B-I03/B-I05 (inner race pitting, 0.2/0.3/0.5 mm), B-O02/B-O03/B-O05 (outer race pitting, 0.2/0.3/0.5 mm), B-R05/B-R08/B-R10 (roller pitting, 0.5/0.8/1.0 mm) This results in twenty bearing statuses in total. All vibration signals were acquired at a constant rotational speed of 1800 rpm with a sampling frequency of 48 kHz, and each signal has a duration of 34 s.
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Institutions
- Henan University of Science and TechnologyHenan, Luoyang