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N P Mehta - One of the best experts on this subject based on the ideXlab platform.

  • Stability analysis of an inverted three-lobe pressure dam bearing
    Journal of Mechanical Science and Technology, 2012
    Co-Authors: N P Mehta, Gian Bhushan, S. S. Rattan, N. K. Batra
    Abstract:

    The stability of an ordinary journal bearing is found to increase by the use of multi-lobes. The performance can be further improved by the incorporation of pressure dam into these bearing. This paper analyzes the dynamic behavior of a new type of bearing, namely, an inverted three-lobe pressure dam bearing. An inverted three-lobe pressure dam bearing is produced by incorporating a pressure dam in the upper lobe and two relief tracks in the lower two lobes of an ordinary inverted three-lobe bearing. The characteristic curves of this bearing show that it is much more stable as compared to an ordinary inverted three-lobe bearing.

  • Static and dynamic characteristics of an inverted three-lobe pressure dam bearing
    2012
    Co-Authors: N. K. Batra, Gian Bhushan, N P Mehta
    Abstract:

    The stability of journal bearings is found to be increased by the use of multilobes. Studies have shown that performance is further increased by the use of pressure dams. This paper analyses the performance of an inverted three-lobe pressure dam bearing, which is produced by incorporating a pressure dam in the upper lobe and two relief tracks in the lower two lobes of an ordinary inverted three-lobe bearing. A generalized Reynolds equation has been derived for carrying out the stability analysis of an inverted three-lobe pressure dam bearing that has been solved using the finite element method. The results indicate that the performance of an inverted three-lobe pressure dam bearing is better than an ordinary three lobe pressure dam bearing.

  • Effect of elastic deformation of bearing liner on the performance of an inverted three-lobe pressure dam bearing
    Proceedings of the Institution of Mechanical Engineers Part J: Journal of Engineering Tribology, 2012
    Co-Authors: N. K. Batra, Gian Bhushan, N P Mehta
    Abstract:

    The elasticity of liner significantly affects the performance of a hydrodynamic bearing. Study of elastohydrodynamics of some of the bearings such as circular, elliptical, offset-halves pressure dam, four-lobe pressure dam, etc. has already been reported. In this article, the effect of elastic deformation on the performance characteristics of an inverted three-lobe pressure dam bearing, which is produced by incorporating a pressure dam in the upper lobe and two relief tracks in the lower two lobes of an ordinary inverted three-lobe bearing is analyzed. The results indicate that liner flexibility considerably affects the stability of an inverted three-lobe pressure dam bearing. The minimum threshold speed decreases whereas the zone of infinite stability increases with increase in the liner flexibility.

  • Effect of Ellipticity Ratio on the Performance of an Inverted Three-Lobe Pressure Dam Bearing
    Tribology Transactions, 2012
    Co-Authors: N. K. Batra, Gian Bhushan, N P Mehta
    Abstract:

    The ellipticity ratio is one of the major parameters that affect the performance of multilobe bearings. This article analyzes the effect of ellipticity ratio on the performance of an inverted three-lobe pressure dam bearing. The performance of an inverted three-lobe pressure dam bearing was found to be better than that of an inverted three-lobe bearing by incorporating a pressure dam in the upper lobe and two relief tracks in the lower two lobes of an ordinary inverted three-lobe bearing. Evaluation of experimental work on ellipticity ratios was done in three steps, viz. 0.4, 0.5, and 0.6, and the results showed that the stability of an inverted three-lobe pressure dam bearing was increased with an increase in the value of the ellipticity ratio.

  • Effect of Load Orientation on the Performance of an Inverted Three-Lobe Pressure dam Bearing
    Advanced Materials Research, 2011
    Co-Authors: N. K. Batra, Gian Bhushan, N P Mehta
    Abstract:

    Sometimes the line of action of the load does not pass through the axis of a bearing and is shifted on either side by a few degrees. The effect of load orientation on the stability of an inverted three-lobe pressure dam bearing has been studied in this paper. An inverted three lobe pressure dam bearing is produced by incorporating two pressure dams in the upper two lobes and one relief track in the lower lobe. The result shows that stability of an inverted three-lobe pressure dam bearing supporting either rigid or flexible rotor is increased for the positive values of load orientation i.e. when the load line is shifted in the opposite direction of rotation.

S. S. Rattan - One of the best experts on this subject based on the ideXlab platform.

  • Stability analysis of an inverted three-lobe pressure dam bearing
    Journal of Mechanical Science and Technology, 2012
    Co-Authors: N P Mehta, Gian Bhushan, S. S. Rattan, N. K. Batra
    Abstract:

    The stability of an ordinary journal bearing is found to increase by the use of multi-lobes. The performance can be further improved by the incorporation of pressure dam into these bearing. This paper analyzes the dynamic behavior of a new type of bearing, namely, an inverted three-lobe pressure dam bearing. An inverted three-lobe pressure dam bearing is produced by incorporating a pressure dam in the upper lobe and two relief tracks in the lower two lobes of an ordinary inverted three-lobe bearing. The characteristic curves of this bearing show that it is much more stable as compared to an ordinary inverted three-lobe bearing.

  • Effect of Load Orientation on the Stability of a Three-lobe Pressure Dam Bearing with Rigid and Flexible Rotors
    Journal of Engineering & Technology, 2011
    Co-Authors: S. S. Rattan, N P Mehta, Gian Bhushan
    Abstract:

    Sometimes the line of action of the load does not pass through the axis of a bearing and is shifted on either side by a few degrees. The effect of load orientation on the stability of a three-lobe pressure dam bearing has been studied in this article. A three-lobe pressure dam bearing is produced by incorporating two pressure dams in the upper lobes and a relief track in the lower lobe of an ordinary three-lobe bearing. The results show that the stability of a three-lobe pressure dam bearing supporting either rigid or flexible rotor is increased for the positive values of load orientation, that is, when the load line is shifted in the opposite direction of rotation.

  • Performance of three-lobe Pressure-Dam bearings
    Tribology International, 1993
    Co-Authors: N P Mehta, S. S. Rattan
    Abstract:

    Abstract The use of multi-lobe bearings, considered to be more stable than ordinary circular bearings in industry is increasing daily. Studies have shown that performance can be further improved if pressure dams are incorporated into these bearings. Analysis of two-lobe pressure dam bearings has been reported in the literature. The present work was carried out to assess the performance of a three-lobe bearing with pressure dams. The results show that the performance of a three-lobe Pressure-Dam bearing is far superior to that of an ordinary three-lobe bearing.

N. K. Batra - One of the best experts on this subject based on the ideXlab platform.

  • Stability analysis of an inverted three-lobe pressure dam bearing
    Journal of Mechanical Science and Technology, 2012
    Co-Authors: N P Mehta, Gian Bhushan, S. S. Rattan, N. K. Batra
    Abstract:

    The stability of an ordinary journal bearing is found to increase by the use of multi-lobes. The performance can be further improved by the incorporation of pressure dam into these bearing. This paper analyzes the dynamic behavior of a new type of bearing, namely, an inverted three-lobe pressure dam bearing. An inverted three-lobe pressure dam bearing is produced by incorporating a pressure dam in the upper lobe and two relief tracks in the lower two lobes of an ordinary inverted three-lobe bearing. The characteristic curves of this bearing show that it is much more stable as compared to an ordinary inverted three-lobe bearing.

  • Static and dynamic characteristics of an inverted three-lobe pressure dam bearing
    2012
    Co-Authors: N. K. Batra, Gian Bhushan, N P Mehta
    Abstract:

    The stability of journal bearings is found to be increased by the use of multilobes. Studies have shown that performance is further increased by the use of pressure dams. This paper analyses the performance of an inverted three-lobe pressure dam bearing, which is produced by incorporating a pressure dam in the upper lobe and two relief tracks in the lower two lobes of an ordinary inverted three-lobe bearing. A generalized Reynolds equation has been derived for carrying out the stability analysis of an inverted three-lobe pressure dam bearing that has been solved using the finite element method. The results indicate that the performance of an inverted three-lobe pressure dam bearing is better than an ordinary three lobe pressure dam bearing.

  • Effect of elastic deformation of bearing liner on the performance of an inverted three-lobe pressure dam bearing
    Proceedings of the Institution of Mechanical Engineers Part J: Journal of Engineering Tribology, 2012
    Co-Authors: N. K. Batra, Gian Bhushan, N P Mehta
    Abstract:

    The elasticity of liner significantly affects the performance of a hydrodynamic bearing. Study of elastohydrodynamics of some of the bearings such as circular, elliptical, offset-halves pressure dam, four-lobe pressure dam, etc. has already been reported. In this article, the effect of elastic deformation on the performance characteristics of an inverted three-lobe pressure dam bearing, which is produced by incorporating a pressure dam in the upper lobe and two relief tracks in the lower two lobes of an ordinary inverted three-lobe bearing is analyzed. The results indicate that liner flexibility considerably affects the stability of an inverted three-lobe pressure dam bearing. The minimum threshold speed decreases whereas the zone of infinite stability increases with increase in the liner flexibility.

  • Effect of Ellipticity Ratio on the Performance of an Inverted Three-Lobe Pressure Dam Bearing
    Tribology Transactions, 2012
    Co-Authors: N. K. Batra, Gian Bhushan, N P Mehta
    Abstract:

    The ellipticity ratio is one of the major parameters that affect the performance of multilobe bearings. This article analyzes the effect of ellipticity ratio on the performance of an inverted three-lobe pressure dam bearing. The performance of an inverted three-lobe pressure dam bearing was found to be better than that of an inverted three-lobe bearing by incorporating a pressure dam in the upper lobe and two relief tracks in the lower two lobes of an ordinary inverted three-lobe bearing. Evaluation of experimental work on ellipticity ratios was done in three steps, viz. 0.4, 0.5, and 0.6, and the results showed that the stability of an inverted three-lobe pressure dam bearing was increased with an increase in the value of the ellipticity ratio.

  • Effect of Load Orientation on the Performance of an Inverted Three-Lobe Pressure dam Bearing
    Advanced Materials Research, 2011
    Co-Authors: N. K. Batra, Gian Bhushan, N P Mehta
    Abstract:

    Sometimes the line of action of the load does not pass through the axis of a bearing and is shifted on either side by a few degrees. The effect of load orientation on the stability of an inverted three-lobe pressure dam bearing has been studied in this paper. An inverted three lobe pressure dam bearing is produced by incorporating two pressure dams in the upper two lobes and one relief track in the lower lobe. The result shows that stability of an inverted three-lobe pressure dam bearing supporting either rigid or flexible rotor is increased for the positive values of load orientation i.e. when the load line is shifted in the opposite direction of rotation.

Gian Bhushan - One of the best experts on this subject based on the ideXlab platform.

  • Stability analysis of an inverted three-lobe pressure dam bearing
    Journal of Mechanical Science and Technology, 2012
    Co-Authors: N P Mehta, Gian Bhushan, S. S. Rattan, N. K. Batra
    Abstract:

    The stability of an ordinary journal bearing is found to increase by the use of multi-lobes. The performance can be further improved by the incorporation of pressure dam into these bearing. This paper analyzes the dynamic behavior of a new type of bearing, namely, an inverted three-lobe pressure dam bearing. An inverted three-lobe pressure dam bearing is produced by incorporating a pressure dam in the upper lobe and two relief tracks in the lower two lobes of an ordinary inverted three-lobe bearing. The characteristic curves of this bearing show that it is much more stable as compared to an ordinary inverted three-lobe bearing.

  • Static and dynamic characteristics of an inverted three-lobe pressure dam bearing
    2012
    Co-Authors: N. K. Batra, Gian Bhushan, N P Mehta
    Abstract:

    The stability of journal bearings is found to be increased by the use of multilobes. Studies have shown that performance is further increased by the use of pressure dams. This paper analyses the performance of an inverted three-lobe pressure dam bearing, which is produced by incorporating a pressure dam in the upper lobe and two relief tracks in the lower two lobes of an ordinary inverted three-lobe bearing. A generalized Reynolds equation has been derived for carrying out the stability analysis of an inverted three-lobe pressure dam bearing that has been solved using the finite element method. The results indicate that the performance of an inverted three-lobe pressure dam bearing is better than an ordinary three lobe pressure dam bearing.

  • Effect of elastic deformation of bearing liner on the performance of an inverted three-lobe pressure dam bearing
    Proceedings of the Institution of Mechanical Engineers Part J: Journal of Engineering Tribology, 2012
    Co-Authors: N. K. Batra, Gian Bhushan, N P Mehta
    Abstract:

    The elasticity of liner significantly affects the performance of a hydrodynamic bearing. Study of elastohydrodynamics of some of the bearings such as circular, elliptical, offset-halves pressure dam, four-lobe pressure dam, etc. has already been reported. In this article, the effect of elastic deformation on the performance characteristics of an inverted three-lobe pressure dam bearing, which is produced by incorporating a pressure dam in the upper lobe and two relief tracks in the lower two lobes of an ordinary inverted three-lobe bearing is analyzed. The results indicate that liner flexibility considerably affects the stability of an inverted three-lobe pressure dam bearing. The minimum threshold speed decreases whereas the zone of infinite stability increases with increase in the liner flexibility.

  • Effect of Ellipticity Ratio on the Performance of an Inverted Three-Lobe Pressure Dam Bearing
    Tribology Transactions, 2012
    Co-Authors: N. K. Batra, Gian Bhushan, N P Mehta
    Abstract:

    The ellipticity ratio is one of the major parameters that affect the performance of multilobe bearings. This article analyzes the effect of ellipticity ratio on the performance of an inverted three-lobe pressure dam bearing. The performance of an inverted three-lobe pressure dam bearing was found to be better than that of an inverted three-lobe bearing by incorporating a pressure dam in the upper lobe and two relief tracks in the lower two lobes of an ordinary inverted three-lobe bearing. Evaluation of experimental work on ellipticity ratios was done in three steps, viz. 0.4, 0.5, and 0.6, and the results showed that the stability of an inverted three-lobe pressure dam bearing was increased with an increase in the value of the ellipticity ratio.

  • Effect of Load Orientation on the Performance of an Inverted Three-Lobe Pressure dam Bearing
    Advanced Materials Research, 2011
    Co-Authors: N. K. Batra, Gian Bhushan, N P Mehta
    Abstract:

    Sometimes the line of action of the load does not pass through the axis of a bearing and is shifted on either side by a few degrees. The effect of load orientation on the stability of an inverted three-lobe pressure dam bearing has been studied in this paper. An inverted three lobe pressure dam bearing is produced by incorporating two pressure dams in the upper two lobes and one relief track in the lower lobe. The result shows that stability of an inverted three-lobe pressure dam bearing supporting either rigid or flexible rotor is increased for the positive values of load orientation i.e. when the load line is shifted in the opposite direction of rotation.

Sanyam Sharma - One of the best experts on this subject based on the ideXlab platform.

  • Performance characteristics of two-lobe pressure dam bearings with micropolar lubrication:
    Proceedings of the Institution of Mechanical Engineers Part J: Journal of Engineering Tribology, 2018
    Co-Authors: Sanyam Sharma, Rajeev Verma
    Abstract:

    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).

  • Effect of Dam Location on the Performance Characteristics of Two -Lobe Bearing: Micropolar Lubricated
    International Journal of Recent advances in Mechanical Engineering, 2015
    Co-Authors: Sanyam Sharma, Murali Krishna Chimata
    Abstract:

    This paper presents the effect of pressure dam parameters on the static and dynamic characteristics of two lobe pressure dam bearing. The modified Reynolds equation is derived on the basis of micropolar fluid theory. The Galerkin approach of finite element method has been used to solve modified Reynold’s equation for carrying out the performance characteristics. The characteristics, which have been calculated for a wide range of dam parameters, have been found to be greatly influenced with the variation of the micropolar parameters. Effect of various dam locations is presented on two micropolar parameter, coupling number (N2) which couples the linear and angular momentum equation, arising the micro rotational effect of the suspended particles in the fluid and characteristics length (lm) which represents the interaction between the micropolar fluid and the film gap.

  • Effect of Ratio on the Performance of Two-Lobe Pressure Dam Bearing: Micropolar Lubricated
    Advances in Tribology, 2015
    Co-Authors: Sanyam Sharma, Chimata Murali Krishna
    Abstract:

    Two-lobe pressure dam bearings are commonly used in high speed rotating machineries. Their use is considered more stable than plain cylindrical bearings. Such bearings have a dam in the upper half whereas the lower half is provided with a relief track. Performance of two-lobe pressure dam bearings under micropolar fluid is evaluated. Finite element method is used to solve the modified Reynolds equation. Fluid film pressures are obtained by solving modified Reynolds equation. Thus pressure obtained is used to find performance characteristics of this bearing. The dynamic performance characteristics are studied at various ratios. Three ratios are considered 1.6, 2.0, and 2.4 for the analysis purpose. Results obtained are presented for various micropolar parameters. Results show that stability of two-lobe pressure dam bearings increases with decrease in aspect ratio ().