Abstract:In this paper, the effect of wear in the fluid film journal bearings on the dynamic behavior of rotor bearing system has been studied depending on the analytical driven of dynamic stiffness and damping coefficients of worn journal bearing. The finite element method was used to modeling rotor bearing system. The unbalance response, critical speed and natural frequency of rotor bearing system have been studied to determine the changes in these parameters due to wear. MATLAB software was used to find the analytic… Show more
“…The region of positive pressure in the state of worn journal bearing can be divided into three sub regions 20 . The derivation of the equation presented herein follows the work of Papanikolaou et al 5 and Jamil et al 20 . Figure 1 Wear model 5 .…”
Section: Mathematical Treatmentmentioning
confidence: 99%
“…With the following assumptions: (i) short journal bearing, (ii) laminar fluid flow, (iii) iso-viscous fluid, (iv) incompressible fluid, and (v) -film cavitation model, the Reynolds equation is written as follows 20 : where,…”
Section: Mathematical Treatmentmentioning
confidence: 99%
“…By integrating the Reynolds equation with respect to Z , the pressure distribution for the non-worn and worn regions are obtained 20 :…”
Section: Mathematical Treatmentmentioning
confidence: 99%
“…The radial and tangential components of fluid film journal bearing forces are presented in Eq. ( 20 ) 20 : Substituting the equation for pressure distribution in the non-worn regions and worn region of fluid film journal bearing into Eq. ( 20 ) gives: Substituting Eq.…”
Section: Mathematical Treatmentmentioning
confidence: 99%
“…They further presented a mathematical model that described the wear present in journal bearings and the effect of the wear on the dynamic response of the rotor-bearing system in frequency domain 19 . Jamil et al 20 investigated the impact of wear in journal bearings on the dynamic behaviour of rotor bearing system relying upon the derivation of dynamic stiffness and damping coefficients of worn journal bearing. Kim et al 21 presented a review that summarized the previous studies done on journal bearing induced nonlinear, rotordynamic forces, and responses.…”
The purpose of this work is to examine the effects of wear severity on the static and dynamic characteristics of journal bearings, and on the vibration response of a rigid rotor supported by journal bearings. Numerical simulations using MATLAB was conducted for three different operating regimes, namely low loaded operating regime ($$\epsilon _0 = 0.15$$
ϵ
0
=
0.15
), moderately loaded operating regime ($$\epsilon _0 = 0.45$$
ϵ
0
=
0.45
) and highly loaded operating regime ($$\epsilon _0 = 0.75$$
ϵ
0
=
0.75
) with wear depth parameter ratio ($$\delta$$
δ
) varied from 0 to 0.5 at increments of 0.1. Numerical results showed that the vibration response of the rotor generally increases with the increase of the wear depth for all cases of low, moderately and highly loaded operating regimes of the bearings. For the values of parameters considered in this work, it was shown that the vibration response amplitude of the rotor in worn journal bearings may be six times larger compared to the response amplitude of the rotor in non-worn bearings.
“…The region of positive pressure in the state of worn journal bearing can be divided into three sub regions 20 . The derivation of the equation presented herein follows the work of Papanikolaou et al 5 and Jamil et al 20 . Figure 1 Wear model 5 .…”
Section: Mathematical Treatmentmentioning
confidence: 99%
“…With the following assumptions: (i) short journal bearing, (ii) laminar fluid flow, (iii) iso-viscous fluid, (iv) incompressible fluid, and (v) -film cavitation model, the Reynolds equation is written as follows 20 : where,…”
Section: Mathematical Treatmentmentioning
confidence: 99%
“…By integrating the Reynolds equation with respect to Z , the pressure distribution for the non-worn and worn regions are obtained 20 :…”
Section: Mathematical Treatmentmentioning
confidence: 99%
“…The radial and tangential components of fluid film journal bearing forces are presented in Eq. ( 20 ) 20 : Substituting the equation for pressure distribution in the non-worn regions and worn region of fluid film journal bearing into Eq. ( 20 ) gives: Substituting Eq.…”
Section: Mathematical Treatmentmentioning
confidence: 99%
“…They further presented a mathematical model that described the wear present in journal bearings and the effect of the wear on the dynamic response of the rotor-bearing system in frequency domain 19 . Jamil et al 20 investigated the impact of wear in journal bearings on the dynamic behaviour of rotor bearing system relying upon the derivation of dynamic stiffness and damping coefficients of worn journal bearing. Kim et al 21 presented a review that summarized the previous studies done on journal bearing induced nonlinear, rotordynamic forces, and responses.…”
The purpose of this work is to examine the effects of wear severity on the static and dynamic characteristics of journal bearings, and on the vibration response of a rigid rotor supported by journal bearings. Numerical simulations using MATLAB was conducted for three different operating regimes, namely low loaded operating regime ($$\epsilon _0 = 0.15$$
ϵ
0
=
0.15
), moderately loaded operating regime ($$\epsilon _0 = 0.45$$
ϵ
0
=
0.45
) and highly loaded operating regime ($$\epsilon _0 = 0.75$$
ϵ
0
=
0.75
) with wear depth parameter ratio ($$\delta$$
δ
) varied from 0 to 0.5 at increments of 0.1. Numerical results showed that the vibration response of the rotor generally increases with the increase of the wear depth for all cases of low, moderately and highly loaded operating regimes of the bearings. For the values of parameters considered in this work, it was shown that the vibration response amplitude of the rotor in worn journal bearings may be six times larger compared to the response amplitude of the rotor in non-worn bearings.
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