An Experimental Investigation on the Response of a Flexible Rotor Mounted in Pressure Dam Bearings

Abstract

The response of a flexible rotor mounted in six bearing sets has been experimentally determined. One set of axial groove bearings and five sets of pressure dam bearings were tested. Conventional synchronous tracking was used in the analysis and other techniques utilizing an FFT analyzer were developed. The stability of the system was seen to strongly depend on the design of the step bearings. The dam bearings were also noted to lock into subsynchronous whip during deceleration after the system went unstable. The response of the system with varying degrees of unbalance is also analyzed and several structural resonances of the rotor system are discussed.

Effect of Load Orientation on the Performance of an Inverted Three-Lobe Pressure dam Bearing

“…Analytical dynamic analysis [4][5] has shown that cylindrical pressure dam bearings are found to be very stable. Also an experimental stability analysis of such types of bearings [6][7] showed that the analytical stability analysis reflects the general trends in the experimental data. The study of noncylindrical pressure dam bearing such as finite-elliptical, half-elliptical, offset-halves, three-lobe and four-lobe pressure dam bearing have proved that by incorporation of a pressure dam, the performance of bearings is improved [8][9][10][11].…”

The Research Progress of High Efficiency Energy-Saving Grinding Equipment

“…The current trend in industry is to run turbo machines at high speeds in order to make them compact and reduce mass.It is found that the performance of ordinary circular or multi-lobe bearings is not very satisfactory .To improve the stability of these bearings,pressure dams are incorporated in these bearings.The analytical dynamic analysis [5][6][7]has shown that the cylindrical pressure-dam bearings are found to be very stable.Also an experimental stability analysis of such types of bearings [8]showed that the analytical stability analysis provides the general trends in the experimental data. Static and dynamic pressure bearing, was a kind of bearing both have dynamic pressure lubrication and static buoyant pressure, the successful application this device applied in a ball mill,could improve the performance and working parameters of ball mil to a great extent l.the mill used high pressure hydraulic system to lubricatethe mill when at startup, Cylinder body was launched by high pressure oil and lubricated by low pressure hydraulic system.thus ensured that the hollow shaft diameter was always good lubricated,so as friction resistance small [8][9],starting current low, also reduced the grinding energy consumption. The motor shaft and pinion shaft adopts pneumatic clutch, subsection start, which reduced the starting current and power.…”

Effect of L/D Ratio on the Performance of an Inverted Three-lobe Pressure Dam Bearing

“…Analytical dynamic analysis [4,5] has shown that cylindrical pressure dam bearings are found to be very stable. Also, an experimental stability analysis of such types of bearings [6,7] showed that the analytical stability analysis reflects the general trends in the experimental data. The study of non-cylindrical pressure dam bearings such as finite-elliptical, half-elliptical, offset-halves, three-lobe and four-lobe pressure dam bearings have proved that by incorporation of a pressure dam, the performance of bearings is improved [8][9][10][11][12][13][14].…”

“…The study of non-cylindrical pressure dam bearings such as finite-elliptical, half-elliptical, offset-halves, three-lobe and four-lobe pressure dam bearings have proved that by incorporation of a pressure dam, the performance of bearings is improved [8][9][10][11][12][13][14]. L/D ratio is one of the important [6][7][8][9] parameters that affect the stability of a bearing. The effect of L/D ratio on the stability of circular bearings was discussed by Lund [10], Badgley et al [11] and Hori [12].…”