Asymmetric Supply Type Hydrostatic Journal Gas Bearings to Support Large Load Rotors

Ise, Tomohiko; Miyatake, Hiroshi; Asami, Toshihiko

doi:10.1299/jamdsm.6.149

Cited by 10 publications

(4 citation statements)

References 4 publications

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“…In this study, verification and confirmation of the bearing mechanism is purpose. Although these values are so small compared with the load of the actual X-ray CT drum caused by the mass and centrifugal force, the bearing diameter was set at 60 mm in accordance with the previous reports (Ise, et al, 2007), (Ise, et al, 2012). Magnitude of unbalance was set as large as possible in this experimental setup configuration.…”

mentioning

confidence: 89%

“…The detailed bearing characteristics have been calculated in a previous study (Ise, et al, 2012), where the divergence formulation method was applied (Yoshimoto, 1986), (JSME, 1973), (Togo, 2002). This method uses the Reynolds equation, which (in the study) was differentiated under conditions of laminar, viscous, and isothermal flow; solved numerically.…”

Section: Proposed Ags Bearing Characteristicsmentioning

confidence: 99%

“…Previously, these bearings were developed and studied for high precision and high-speed rotating machine tools and cryogenic turbo machines, etc. Recently, externally pressurized gas journal bearings with asymmetric gas supply have been proposed and studied (Ise, et al, 2012), (Ise, 2011). This bearing was developed to support large load rotors such as large eccentric rotors similar to those used in vibration exciters.…”

Section: Introductionmentioning

confidence: 99%

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Experimental verification of externally pressurized gas journal bearings with asymmetric gas supply (Supply gas pressure control operation using a small size test rig)

Ise

Imanishi

Asami

et al. 2014

JAMDSM

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Experimental verification of externally pressurized gas journal bearings with asymmetric gas supply (Supply gas pressure control operation using a small size test rig) 2Ise, Imanishi, Asami, Tokumiya, Takada, Kimura and Yamaguchi, Journal of Advanced Mechanical Design, Systems, and Manufact, Vol.8, No.3 (2014) © 2014 The Japan Society of Mechanical Engineers [DOI: 10.1299/jamdsm.2014jamdsm0029] Fig. 1 Configuration of an X-ray CT gantry being more useful in terms of support of the load compared with the previously developed bearings (Okano, et al., 2006), (Ise, et al., 2007a), (Ise, et al., 2010), (Ise, et al., 2007b).We propose that this type of bearing is applicable for use in an X-ray computed tomography (hereafter called as X-ray CT) scanner gantry (Tokumiya, et al., 2013). The rotary drum of the gantry has electrical units to computed tomography scanning, as shown in Fig.1. The drum is supported by rolling contact bearing. The dynamic unbalance is roughly canceled by the arrangement of these devices. The rotary drum inner diameter is 800 or 1,000 mm and the rotating speed is 100 or 220 rpm. In present devices, rolling contact bearings are used to support the rotor. The maximum circumferential speed exceeds 11.5 m/s in present conditions. Rotation produces a somewhat unbalanced centrifugal force since the rotary drum has a small eccentricity although the unbalance is cancelled; therefore, the force due to residual unbalance with the drum mass gives to the bearings as the load. For these reasons, a large torque is required in the operation. A greater rotational speed is presently demanded of the gantry because realization of high speed rotation will result in higher precision scanning. However, a higher rotational speed results in a shorter bearing lifetime and an increase of noise, which tends to create higher patient anxiety. Radiation exposure of the patient also can be reduced by this mechanism because examination time decreases by high speed rotation. The use of the proposed gas bearings can potentially solve these problems.The final purpose is application of this bearing for the X-ray CT gantry. For this purpose, verification of the proposed bearing mechanism under the supply gas pressure control condition is first necessary. This report presents rotational tests of the proposed hydrostatic gas journal bearings with asymmetric gas supply using a small sized preliminary test rig to verify the effectiveness of the proposed mechanism. Ise, Imanishi, Asami, Tokumiya, Takada, Kimura and Yamaguchi, Journal of Advanced Mechanical Design, Systems, and Manufact, Vol.8, No.3 (2014) Working mechanism of the proposed bearingExperimental verification of the capacity of externally pressurized gas journal bearings with asymmetric gas supply (called AGS bearings hereafter) to support large load rotors was conducted. The working mechanism and the characteristics of the AGS bearing were examined by comparison with the conventional type of externally pressurized gas journal bearing. A schematic of the proposed AG...

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confidence: 89%

Section: Proposed Ags Bearing Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental verification of externally pressurized gas journal bearings with asymmetric gas supply (Supply gas pressure control operation using a small size test rig)

Ise

Imanishi

Asami

et al. 2014

JAMDSM

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“…Generally, the deeper the seismic wave transmission, the greater the similarity of signals, and the better the precision-controllable exploration. 25 Therefore, this paper characterizes the variation of the excitation performance of the precision-controllable vibrator by the down-transmission energy and signal similarity.…”

Section: Structural Optimization Model Based On Excitation Performance Evaluation Parametersmentioning

confidence: 99%

Excitation performance enhancement based on optimization of structural parameters of precision-controllable vibrator

Huang

Wang

et al. 2021

Advances in Mechanical Engineering

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This paper focuses on solving the problem of poor excitation performance of precision- controllable vibrator leading to shallow exploration depths, which cannot fully meet the current demand for deep oil and gas resources exploration. For this purpose, the evaluation parameters of the excitation performance of the precision-controllable vibrator are clarified, an optimization model of the structure parameters of the precision-controllable vibrator is established. Particle swarm algorithm and Pareto optimization logic are used to integrate the solution set to optimize the structure of precision-controllable vibrator and enhance the excitation performance of precision-controllable vibrator.

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Externally Pressurized Gas Journal Bearing with Slot Restrictors Arranged in the Axial Direction (Experimental Verification of Bearing Stiffness using Large Unbalanced Rotor)

Ise

Nagao

Matsubara

et al. 2019

Advances in Mechanism and Machine Science

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Asymmetric Supply Type Hydrostatic Journal Gas Bearings to Support Large Load Rotors

Cited by 10 publications

References 4 publications

Experimental verification of externally pressurized gas journal bearings with asymmetric gas supply (Supply gas pressure control operation using a small size test rig)

Experimental verification of externally pressurized gas journal bearings with asymmetric gas supply (Supply gas pressure control operation using a small size test rig)

Excitation performance enhancement based on optimization of structural parameters of precision-controllable vibrator

Externally Pressurized Gas Journal Bearing with Slot Restrictors Arranged in the Axial Direction (Experimental Verification of Bearing Stiffness using Large Unbalanced Rotor)

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