Design and Workout of ACROSS Transmitters Using Air Bearings

Ise, Tomohiko; Torii, Takao; Morita, Nobuyoshi; Kunitomo, Takahiro; Togo, Shinichi; Okano, Makoto

doi:10.1016/s0950-1401(10)04016-4

Cited by 7 publications

(5 citation statements)

References 1 publication

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“…Let the density of the ground be r, the modulus of elasticity be E, z = 0 at the surface, and the orientation down is positive, assuming that the micro-element section is stretched at this time, dz 1 . 0 the downtransmission energy is in accordance with the formula 28 :…”

Section: Excitation Performance Evaluation Parametersmentioning

confidence: 99%

“…Take a slender cylindrical section in the elastic half-space model for analysis, the cross-sectional area is ds , as shown in Figure 4, the baseplate drives the ground along the z -axis direction vibration, through the vibration form of P waves to the deeper part of the ground. Let the density of the ground be ρ , the modulus of elasticity be E , z = 0 at the surface, and the orientation down is positive, assuming that the micro-element section is stretched at this time, dz 1 > 0 the down-transmission energy is in accordance with the formula 28 :…”

Section: Structural Optimization Model Based On Excitation Performance Evaluation Parametersmentioning

confidence: 99%

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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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Section: Excitation Performance Evaluation Parametersmentioning

confidence: 99%

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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“…To minimize the resistance torque from bearings, pressure-feed air bearing is adapted as support components of second-motor rotor [6]. Friction torque of air bearing is smaller than mechanical bearing (1/1000 or less).…”

Section: Structure Design Of Viscometermentioning

confidence: 99%

Structure Design and Simulation of Viscometer Based on Velocity Attenuation

Wang

Yao

Geng³

et al. 2012

AMR

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A viscometer based on velocity attenuation is presented. It is used to measure viscosity of liquid at an arbitrary velocity. Structure of the viscometer is designed. A motor designed specially called Series-Motor is used as driven motor of the viscometer to keep the flow stability of test liquid. A solid rotor motor is adapted to reduce the cogging effect. Pressure-feed air bearing is adapted as support to minimize the resistance torque. Simulation is made in MATLAB. Results show that Series-Motor reduces the resistance torque besides the viscous torque and it provides slow speed motor to keep the flow stability.

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“…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).…”

Section: Introductionmentioning

confidence: 99%

“…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).…”

mentioning

confidence: 99%

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

Self Cite

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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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Design and Workout of ACROSS Transmitters Using Air Bearings

Cited by 7 publications

References 1 publication

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

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

Structure Design and Simulation of Viscometer Based on Velocity Attenuation

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

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