Abstract
By considering the deep groove ball bearing as the research object, and using Hertzian contact theory and elastic mechanics and geometry, a nonlinear dynamic model is established herein for the study of vibration response of deep groove ball bearings having single defect on surfaces of inner and outer races. The outer race and inner race defect size parameters are introduced into this nonlinear dynamic model, and dynamic models of localized fault on outer race, inner race of rolling element bearing are simulated and analyzed by using Runge-Kutta method. Both simulated and experimental localized fault signals (acceleration signals) are subjected to the same diagnostic techniques; namely time domain waveform comparisons and envelope analysis. Then, the impact characteristic that reflects the fault severity in rolling element bearings is obtained from the time interval between two impact points. The simulating results are in accordance with experimental results, which proves the accuracy and practicality of the models used in engineering application. The characteristic defect frequencies and related harmonics are broadly investigated and presented herein. This proposed model provides theoretical basis for monitoring and fault diagnosis of rolling bears.
Highlights
Rolling bearings are widely used in various mechanical systems viz. mechanisms, equipment and machines in industries
The results demonstrated that the usage of the Minimum Entropy Deconvolution (MED) technique had shown a strong enhancement for both fault detection and diagnosis
The impact vibrations caused by the bearing clearance changing can be reflected in the time domain waveform
Summary
Rolling bearings are widely used in various mechanical systems viz. mechanisms, equipment and machines in industries. The existence or development of even tiny local defects on the mating surfaces of bearing components in a mechanical system may lead to its catastrophic failure due to progressively increase in defect size through passes of time. Detection of local defects in their early stages through observations of vibration signals of rolling bearings is essentially a vital issue. McFadden and Smith [2] presented a simple model to describe the vibration of the rolling element bearing having single point defect on the inner race under constant radial load. Tadina [5] improved a comprehensive model of a ball bearing to obtain the vibration response due to different sizes of localized defects. NONLINEAR DYNAMIC MODEL AND VIBRATION RESPONSE OF FAULTY OUTER AND INNER RACE ROLLING ELEMENT BEARINGS.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have