Rolling bearing operating status identification:
Demodulation spectrum, as a measurement parameter for early fault indication, combined with velocity spectrum, is key to determining bearing faults. The development process of rolling bearing faults can be divided into four stages:
(1) No bearing fault frequency, good condition, continue monitoring as a baseline;
(2) Fault frequency exists only in the demodulation spectrum, early fault indication, or lubrication required;
(3) Spectral peaks exist in both spectra, plan to replace the bearing during the next maintenance;
(4) Peaks exist only in the normal spectrum, and noise levels increase in the demodulation spectrum, replace immediately.
The characteristics of the bearings at each stage are described below:
Phase 1: (1) Noise is normal; (2) Temperature is normal; (3) Ultrasonic, vibration demodulation spectrum, and acoustic emission measurements exceed standards, indicating a defect in the bearing outer ring; (4) Total vibration is small, with no discrete bearing fault frequency spikes; (5) Remaining bearing life is greater than 10% of the value specified in B-10.
Phase 2: (1) Noise slightly increases; (2) Temperature is normal; (3) Ultrasonic, vibration demodulation spectrum, and acoustic emission measurements significantly increase, indicating a defect in the bearing outer ring; (4) Vibration increment slightly increases (total vibration acceleration and total vibration velocity); (5) Bearing fault frequencies are clearly visible on the logarithmic scale spectrum, but difficult to see on the linear scale spectrum, indicating a significant increase in noise; (6) Remaining bearing life is greater than 5% of the value specified in B-10.
Phase 3: (1) Noise is audible; (2) Temperature rises slightly; (3) Very high ultrasonic, acoustic emission, and demodulation spectrum passband values; (4) Total vibration acceleration and total vibration velocity increase significantly; (5) Bearing fault frequencies, their harmonic frequencies, and sideband frequencies are clearly visible on the linear scale spectrum; (6) The noise level of the vibration spectrum increases significantly; (7) The remaining bearing life is greater than 1% as specified in B-10.
Phase 4: (1) Noise intensity changes; (2) Temperature rises significantly; (3) Ultrasonic, acoustic emission, and vibration demodulation spectrum passband values increase rapidly and then gradually decrease, indicating the bearing outer ring is in a fault state prior to damage; (4) Total vibration velocity and total vibration displacement increase significantly, while total vibration acceleration decreases; (5) Lower-frequency bearing fault frequency spikes dominate, and the noise level in the vibration spectrum is greater than 0.2% of the remaining life as specified in B-10.
About LJHB:
LuoYang JinShuo Precision Bearing Co., Ltd. is mainly committed to the R&D and sales of high-precision bearings and other special products, and provides bearings and transmission parts with high performance for customers' equipment. With quick response, from pre-sales technical communication to on-time production delivery, as well as perfect after-sales service, we win the recognition and trust of customers.
Our main products include cylindrical roller bearings, tapered roller bearings, slew bearings, gear drives, spindle bearings, crossed roller bearings, turret bearings, thin-wall bearings, tandem roller bearings, spherical roller bearings, etc. The bearing dimensions rang from 100mm to 6000mm, the accuracy reaches P5, P4 and P2 levels. The bearing are widely used in mining and metallurgy, industrial equipment, industrial gearboxes, petroleum equipment, cranes, medical equipment, robotic equipment, etc. Among them, cylindrical roller bearings with better performance and high-precision deep groove ball bearings have been explored for high-speed tubular strander rotating cable equipment, which have completely replaced imports, saving customers costs and time, and improving work efficiency. It has been recognized and widely praised by customers.
Contact LJHB:
Address: Yiyang Bearing Industry Zone, Luoyang City, China 47100
Tel/Wechat: +86-18037970383
Whatsapp: +86-18037970383
Fax: 0086-379-65199160
E-mail: lyjh@lyjhbearing.com
Website: www.chinajhbearing.com
