Abstract:A steady-state performance analysis of two-lobe oil journal bearing has been carried out in this paper. A computer program has been prepared to calculate the steady-state hydrodynamic characteristics. To study the steady-state characteristics of two-lobe bearing, the nondimensional Reynolds’ equation is solved to obtain nondimensional values of load-carrying capacity, flow rate, attitude angle, and friction variable. Parameters of the design are studied for different groove configurations and an optimized groo… Show more
“…In Table 1, the results of the optimization of by Roy and Kakoty 7 and Roy and Kakoty 8 are compared and in Figure 5, the results of the optimization of Joy and Roy 9 and Guo 14 are compared. Figure 5.Dimensionless load-carrying capacity vs. eccentricity ratio ɛ with spherical dimples textured, cylindrical dimples textured, plain journal bearing, and two-lobe journal bearing.…”
Section: Resultsmentioning
confidence: 99%
“…Figure 5.Dimensionless load-carrying capacity vs. eccentricity ratio ɛ with spherical dimples textured, cylindrical dimples textured, plain journal bearing, and two-lobe journal bearing. 9,14 …”
Section: Resultsmentioning
confidence: 99%
“…In 2014, 8 they also published a new paper about the optimization of a three- and four-lobe bearing by considering the same objective functions and optimization algorithm. Later on in another study by them in 2016, 9 a steady-state performance analysis of two-lobe oil journal bearing was also optimized by considering the minimization of friction variable, maximization of non-dimensional load-carrying capacity, and flow rate as objective functions. In 2015, an Artificial Bee Colony algorithm for finding the optimal performance of fixed pad hydrodynamic journal bearings was proposed by Gorasso et al.…”
In this paper, multi-objective particle swarm optimization method is developed for optimizing thermo-hydrodynamic journal bearings. This paper focuses on the use of multi-objective particle swarm optimization algorithm with a combination of the thermal hydrodynamic governing equations of the fluid film (i.e. momentum and energy equations) to optimize hydrodynamic partial pad journal bearings and compare with other articles. The governing equations are solved by the central difference method with a successive over-relaxation scheme and the backward difference with an iterative technique. In the paper, the lubricant viscosity changes with the temperature variation in whole fluid film. In this optimization, the bearing power loss, the minimum oil film thickness, and the maximum oil temperature are considered as objective functions and the radial clearance and length to diameter ratio are selected as design variables. The results of the objective functions are compared to other articles. Also, this study discusses the entropy and availability of two concentric cylinders with low curvature and constant wall temperature. Calculations showed that by increasing the Eckert number, the availability increases.
“…In Table 1, the results of the optimization of by Roy and Kakoty 7 and Roy and Kakoty 8 are compared and in Figure 5, the results of the optimization of Joy and Roy 9 and Guo 14 are compared. Figure 5.Dimensionless load-carrying capacity vs. eccentricity ratio ɛ with spherical dimples textured, cylindrical dimples textured, plain journal bearing, and two-lobe journal bearing.…”
Section: Resultsmentioning
confidence: 99%
“…Figure 5.Dimensionless load-carrying capacity vs. eccentricity ratio ɛ with spherical dimples textured, cylindrical dimples textured, plain journal bearing, and two-lobe journal bearing. 9,14 …”
Section: Resultsmentioning
confidence: 99%
“…In 2014, 8 they also published a new paper about the optimization of a three- and four-lobe bearing by considering the same objective functions and optimization algorithm. Later on in another study by them in 2016, 9 a steady-state performance analysis of two-lobe oil journal bearing was also optimized by considering the minimization of friction variable, maximization of non-dimensional load-carrying capacity, and flow rate as objective functions. In 2015, an Artificial Bee Colony algorithm for finding the optimal performance of fixed pad hydrodynamic journal bearings was proposed by Gorasso et al.…”
In this paper, multi-objective particle swarm optimization method is developed for optimizing thermo-hydrodynamic journal bearings. This paper focuses on the use of multi-objective particle swarm optimization algorithm with a combination of the thermal hydrodynamic governing equations of the fluid film (i.e. momentum and energy equations) to optimize hydrodynamic partial pad journal bearings and compare with other articles. The governing equations are solved by the central difference method with a successive over-relaxation scheme and the backward difference with an iterative technique. In the paper, the lubricant viscosity changes with the temperature variation in whole fluid film. In this optimization, the bearing power loss, the minimum oil film thickness, and the maximum oil temperature are considered as objective functions and the radial clearance and length to diameter ratio are selected as design variables. The results of the objective functions are compared to other articles. Also, this study discusses the entropy and availability of two concentric cylinders with low curvature and constant wall temperature. Calculations showed that by increasing the Eckert number, the availability increases.
“…Optimum oil groove location of two-lobe bearings affects the performance of bearings. 18 Kumar and Kakoty 19 evaluated the performance of three-lobe pressure dam bearings using finite difference method. They suggested that by incorporating dam and relief track, stability and threshold speed increases.…”
Section: Introductionmentioning
confidence: 99%
“…They suggested that by incorporating dam and relief track, stability and threshold speed increases. Results of researchers 15–19 indicated an enhancement in the performance of pressure dam bearings by incorporating dam in the upper lobe and relief track in the lower lobe of a non-circular hydrodynamic journal bearing, while operating with Newtonian lubrication.…”
A circular bearing experiences the instability problem due to oil whirl, causing violent vibrations at high speed. Two-lobe pressure dam bearing is a solution to the instability arising in high-speed rotating machineries. The paper presents the various static and dynamic characteristics of two-lobe pressure dam bearings, while operating with micropolar fluid. The modified Reynolds equation used to model the lubrication is solved using the finite element method. Performance characteristics such as load, attitude angle, critical mass, threshold speed and whirl frequency are computed, presented graphically and analysed. A detailed comparison of the performance characteristics is done for various micropolar and dam parameters. It is concluded that bearing performance is significantly influenced by dam parameters (dam angles) and micropolar parameters (coupling number and characteristics length).
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