A review on machinery diagnostics and prognostics implementing condition-based maintenance

Artificial intelligence for fault diagnosis of rotating machinery: A review

Vibration of cracked structures: A state of the art review

Recent advances in time–frequency analysis methods for machinery fault diagnosis: A review with application examples

Residual life predictions for ball bearings based on self-organizing map and back propagation neural network methods

A numerical solution for the stiffness and damping characteristics of an isothermal, elastohydrodynamically lubricated point contact is presented considering the surface roughness effect an...

Stiffness and damping characteristics of lubricated ball bearings considering the surface roughness effect. Part 2: Numerical results and application

After unbalance, coupling misalignment is the most common fault present in rotating machines. However, limited research has been carried out on coupling misalignment and its effects. The present study aims to explore the research on coupling misalignment by briefly summarizing the research work done so far on different modelling techniques, effects on the system behaviour, fault identification and condition monitoring techniques.

Coupling misalignment in rotating machines: modelling, effects and monitoring

Vibration and stress fluctuation in cracked shafts

The dynamic behavior of structures, in particular, that of a rotor, containing cracks is a subject of considerable current interest. In the present study, the influence of a transverse surface crack, both open and breathing conditions, on the mechanical impedance of the rotor-bearing system, has been investigated by FEM analysis for flexural vibrations. The results show that the mechanical impedance changes substantially due to the presence of crack and follow definite trends with the crack parameters (depth and location) and force location. The normalized mechanical impedance of rotor system is more sensitive to the breathing crack when compared to the open crack. The sudden changes in mechanical impedance have been observed at the multiples of the running frequency for the breathing crack. The measurement of mechanical impedance has been suggested for crack detection and condition monitoring of rotor-bearing systems.

Detection and monitoring of cracks using mechanical impedance of rotor-bearing system

The objective of this study is to analyze the dynamic behavior of composite shafts with particular interest on estimation of damping. The composite shafts have been chosen as potential candidates for the replacement of conventional metallic shafts in many applications. This study analyzed the dynamic behavior of different materials such as glass/epoxy, carbon/epoxy, and boron/epoxy at different speeds. Detailed dynamic studies on the effect of different materials, stacking sequences on the unbalance responses, and eigenfrequencies are required, particularly with respect to the damping present in the composite material. Different methodologies such as logarithmic decay curve, half-power method, and hysteresis loop method using force sensors have been used for determining the damping of the composite shafts. Composite tube-shafts and solid shafts have been modeled and analyzed using ANSYS. A parametric study has been carried out to analyze the effect of stacking sequence on eigenfrequencies of composite tub...

A. S. Sekhar

Papers

Stiffness and damping characteristics of lubricated ball bearings considering the surface roughness effect. Part 2: Numerical results and application

Coupling misalignment in rotating machines: modelling, effects and monitoring

Vibration and stress fluctuation in cracked shafts

Detection and monitoring of cracks using mechanical impedance of rotor-bearing system

Dynamic analysis of shafts of composite materials