Abstract
In the present study, localized surface defects are modelled in inner race and outer race, and nonlinear dynamic behaviour of the system has been observed and quantified using Higuchi’s fractal dimensions. The Hertzian contact among the rollers and races, clearance and nonlinear damping are considered as sources of nonlinearity. Dynamic responses show system behaviour as periodic, quasi-periodic and chaotic at different rotor speeds. The onset of chaotic motion is identified using Poincaré maps and Higuchi’s fractal dimensions. The system shows low peak-to-peak amplitude of vibration responses at higher speeds in the presence of defects. Results also indicate that Higuchi’s fractal dimensions can be effectively used as a diagnostic tool for health monitoring.
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Abbreviations
- N :
-
number of observations in time series data
- FD est :
-
estimated FD of the signal
- FD th :
-
theoretical FD of the signal
- k :
-
nonlinear stiffness, N/mm
- L u :
-
useful length of the roller, mm
- δ :
-
deformation of the roller at contact points, mm
- Q :
-
contact force, N
- W :
-
vertical radial load, N
- \( F_{{\theta_{j} }} \) :
-
contact force at jth roller, N
- θ j :
-
angular position of the jth roller, radian
- R cr :
-
radial clearance, mm
- X, Y :
-
state space variable
- \( \mathop {P_{{d_{j} }} }\limits^{ \to } \) :
-
nonlinear dissipative force, N
- U f :
-
unbalanced force, N
- N r :
-
number of rollers
- ω cg :
-
angular velocity of the cage, rad/s
- ω ir :
-
angular velocity of the inner race, rad/s
- δ s :
-
additional deflection due to defect (spall), mm
- R ir :
-
radius of the inner race, mm
- R or :
-
radius of the outer race, mm
- dw :
-
defect width, mm
- \( \phi_{dir} \) :
-
angle of defect corresponding to inner race, radian
- \( \phi_{dor} \) :
-
angle of defect corresponding to outer race, radian
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Appendix A
Appendix A
For a rolling element bearing, having rotating inner race, various corresponding frequencies are
outer race malfunction frequency or ball passage frequency
inner race malfunction frequency or wave passage frequency
and rolling element malfunction frequency or rolling element spin frequency or wave passage frequency of rolling element
where Nr is a number of rolling elements, \( \omega_{s} \)is shaft rotational frequency, d is rolling element diameter, D is pitch circle diameter and β is contact angle.
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Sharma, A., Amarnath, M. & Kankar, P.K. Nonlinear dynamic analysis of defective rolling element bearing using Higuchi’s fractal dimension. Sādhanā 44, 76 (2019). https://doi.org/10.1007/s12046-019-1060-x
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DOI: https://doi.org/10.1007/s12046-019-1060-x