220 Pressure distribution measurement of the high speed co-rotating disk by Pressure Sensitive Paint

2008 ◽  
Vol 2008.57 (0) ◽  
pp. 127-128
Author(s):  
Masaya Hayashida ◽  
Yu Matsuda ◽  
Dai Naito ◽  
Hideo Mori ◽  
Tomohide Niimi
Keyword(s):  
Pressure Distribution ◽  
High Speed ◽  
Rotating Disk ◽  
Pressure Sensitive Paint ◽  
Distribution Measurement ◽  
Pressure Sensitive

Pressure-Sensitive Paint Measurement on Co-Rotating Disks

2010 ◽  
Author(s):  
Tomohiro Kameya ◽  
Yu Matsuda ◽  
Hiroki Yamaguchi ◽  
Yasuhiro Egami ◽  
Tomohide Niimi
Keyword(s):  
Pressure Distribution ◽  
High Speed ◽  
Outer Region ◽  
Disk Drive ◽  
Concentric Circle ◽  
Temperature Sensitive ◽  
Pressure Sensitive Paint ◽  
Rotating Disks ◽  
Disk Rotation ◽  
Pressure Sensitive

There appears fluttering phenomena in a hard disk drive system with high-speed disks rotating inside a closed space, leading to degrade of reading and writing performance. The precise pressure distribution on the disk may improve the performance, but there has been no report because it is very hard to measure the surface pressure using conventional techniques, such as pressure taps. While pressure sensitive paint (PSP) seems to be suitable for the pressure measurement on the disk, we have to compensate its highly temperature-sensitive characteristics of PSP, because the temperature distribution on the disk is not assumed to be uniform. We employed PySO3H based PSP, which has small temperature sensitivity, and have obtained the pressure distribution on the disk rotated at various speeds (10000–20000 rpm) successfully. The result showed that the pressure is higher at the disk outside than at the center, and forms a concentric circle distribution. Moreover, we found that the pressure difference between the inner and outer region of the disk increases as a square of disk rotation speed.

S1604-1-1 Measurement of time-averaged pressure distribution on a rotating disk by pressure-sensitive paint

2010 ◽  
Vol 2010.5 (0) ◽  
pp. 123-124
Author(s):  
Tomohiro KAMEYA ◽  
Yu MATSUDA ◽  
Hiroki YAMAGUCHI ◽  
Yasuhiro EGAMI ◽  
Tomohide NIIMI
Keyword(s):  
Pressure Distribution ◽  
Rotating Disk ◽  
Pressure Sensitive Paint ◽  
Pressure Sensitive

Pressure Distribution in the Calendering of Plastic Materials

1951 ◽  
Vol 18 (1) ◽  
pp. 101-106
Author(s):  
J. T. Bergen ◽  
G. W. Scott
Keyword(s):  
Pressure Distribution ◽  
Viscous Liquid ◽  
High Speed ◽  
Plastic Material ◽  
The Body ◽  
Experimental Results ◽  
Distribution Characteristics ◽  
Flow Properties ◽  
Pressure Sensitive ◽  
Plastic Materials

Abstract In the calendering, or rolling, of a plastic material in to sheet form by passing it between parallel rolls, hydrostatic pressure is exerted against the surface of the roll throughout the region of contact with the plastic mass. This pressure has been measured by means of a pressure-sensitive cylinder, inserted in the body of a 10-in-diam roll, together with high-speed oscillographic technique. The materials which were calendered consisted of a resin which exhibited flow properties characteristic of a viscous liquid, and several filled plastic compositions of commercial interest. Pressure maxima ranging up to 8000 psi were observed. Comparison of experimental results with theoretical expressions for pressure distribution, as given by several authors, indicates that the equation derived by Gaskell quite satisfactorily predicts the results for the case of the viscous liquid. The commercial plastics were found to exhibit pressure-distribution characteristics which were perceptibly different from those of the viscous liquid. Certain limitations of Gaskell’s treatment of nonviscous materials prevent its application to these experimental results.

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