Study on the basic characteristics of a vortex bearing element

Li, Xin; Horie, Mikio; Kagawa, Toshiharu

doi:10.1007/s00170-012-4372-0

Cited by 29 publications

(13 citation statements)

References 24 publications

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“…The air rotation inertia force (also known as the centrifugal force) exhibits a cupped pressure that is distributed in the chamber, while the air flowing through the gap between the peripheral flotation plane and the workpiece reaches a high pressure under the action of the viscous friction. It can be concluded from the previous experiments (shown in Figure 9, with selected data from) 12 that when the gap varies slightly within a small range, the state of the rotating flow in the chamber is not affected by the variations in h, i.e. the shape of the pressure distribution exhibits no obvious changes.…”

Section: Resultsmentioning

confidence: 77%

“…(3) We have proposed a design scheme for a flotation element based on a rotation flow (Figure 2c), in which a cylindrical chamber is placed in the centre of the element and the nozzles are aligned in the tangential direction of the chamber. 12 After ejection from the nozzle, the air rotates and forms a rotating flow along the circular wall of the chamber. Because the direction of air injection is parallel to the surface of the glass substrate, the air is not directly ejected onto the substrate surface.…”

Section: Symbol Quantity Fmentioning

confidence: 99%

“…However, the negative pressure caused by the rotating flow can exert a suction force on the substrates and, thus, the flotation height of the substrate is reduced. [12][13][14] This can lead to an increased probability of contact between the glass substrates and the air rail during the flotation transmission.…”

Section: Symbol Quantity Fmentioning

confidence: 99%

“…The air can be expelled uniformly at low speed, and the stress produced on the glass substrates can be reduced. However, the manufacturing costs of porous materials are high, rendering them unsuitable for use in air flotation rail systems for large scale glass substrate production. We have proposed a design scheme for a flotation element based on a rotation flow (Figure c), in which a cylindrical chamber is placed in the centre of the element and the nozzles are aligned in the tangential direction of the chamber . After ejection from the nozzle, the air rotates and forms a rotating flow along the circular wall of the chamber.…”

Section: Introductionmentioning

confidence: 99%

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Development and experimental evaluation of air flotation element with additional air‐intake capacity

Guo

Kagawa

2015

Lubrication Science

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Focusing on the flotation transmission of thin and light glass substrates, we propose a new air flotation element design. This new element takes advantage of a rotating airflow to form negative pressure, which then intakes additional air to support the floating workpiece via an intake hole connecting the negative pressure with the atmospheric environment. This design can effectively improve the flotation height and can reduce air consumption. Here, the structure and operating principles of this new element are illustrated, while the fundamental characteristics are experimentally investigated. We study the variation of negative pressure and the resulting intake flow when the flotation height varies. It is found that the new flotation element can intake additional air when the flotation height is larger than a certain critical value. Also, the additional air is conducive to raising the flotation level of the workpiece. This feature is suitable for applications involving low flotation forces, e.g. the flotation transmission of thin and light glass substrates. Additionally, the performances of the new element and the traditional orifice element are compared, indicating that, for the same flotation force and supplied airflow, the newly designed element can increase the flotation height by 25%. On the other hand, the air consumption can be reduced by approximately 50% using the new element, for the same flotation force and height. Copyright © 2015 John Wiley & Sons, Ltd.

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Section: Resultsmentioning

confidence: 77%

Section: Symbol Quantity Fmentioning

confidence: 99%

Section: Symbol Quantity Fmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Development and experimental evaluation of air flotation element with additional air‐intake capacity

Guo

Kagawa

2015

Lubrication Science

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“…In our previous research, we analyzed the basic characteristics of a single vortex bearing element, and proved that this type performed better than the traditional orifice-type in terms of bearing stiffness and stress reduction [13]. In this research, we fabricate an air conveyor using vortex bearing elements, and conduct an experimental investigation on the problems that may arise in the actual transporting process to affect the flotation of the substrate.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Investigation on the Quasi-Static Flotation Transport of a Glass Substrate Using Vortex Bearing Elements

Li¹,

Nakamura²,

Horie³

et al. 2013

JFCMV

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In this paper, we build an air conveyor with newly developed vortex bearing elements, and study the flotation precision of the front-end of the substrate in quasi-static flotation transport. We experimentally discuss the three influential factors: air supply pressure, thickness of the substrates and installing direction of the vortex bearing element. We find that during the process of transport the movement of the substrate leads to the variation of flotation height. The amplitude of variation (e.g. flotation precision) is dependent upon the bearing stiffness and the suction force of the vortex bearing elements. Increasing air supply pressure properly can improve the flotation precision, but an excess pressure can cause over-suction due to high negative pressure and result in a poor flotation precision. We also know that the flotation precision of thin and light substrates are easily affected by the suction force of vortex flow because they float with a high flotation height and are more susceptible to deformation. Finally, we investigate four installing directions of the vortex bearing element. Different installing direction can lead to different variation of flotation height.

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Detection of defective embedded bearings by sound analysis: a machine learning approach

Saucedo-Espinosa

Berrones

2014

J Intell Manuf

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This paper describes a machine learning solution for the detection of defective embedded bearings in home appliances by sound analysis. The bearings are installed deep into the home appliances at the beginning of the production process and cannot be physically accessed once they are fully assembled. Before a home appliance is put to sale, it is turned on and passed through a sound-based sensor that produces an acoustic signal. Home appliances with defective embedded bearings are detected by analyzing such signals. The approached task is very challenging, mainly because there is a small number of sample signals and the noise level in the measurements is quite high. In fact, it is showed that the signal-to-noise ratio is high enough to mask important components when applying traditional Fourier decomposition techniques. Hence, a different approach is needed. Experimental results are reported on both laboratory and production line signals. Despite the difficulty of the task, these results are encouraging. Several classification methods were evaluated and most of them achieved acceptable performance. An interesting finding is that, among the classifiers that showed better performance, some methods are highly intuitive and easy to implement. These methods are generally preferred in industry. The proposed solution is being implemented by the company which motivated this study.

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Study on the basic characteristics of a vortex bearing element

Cited by 29 publications

References 24 publications

Development and experimental evaluation of air flotation element with additional air‐intake capacity

Development and experimental evaluation of air flotation element with additional air‐intake capacity

An Experimental Investigation on the Quasi-Static Flotation Transport of a Glass Substrate Using Vortex Bearing Elements

Detection of defective embedded bearings by sound analysis: a machine learning approach

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