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2 results on '"modified spiral geometry"'

1. Characteristics of Modified Spiral Thrust Bearing through Geometries and Dimension Modifications

Author

Mohd Danial Ibrahim, Norliza Marusman, Yuta Sunami, Siti Nur Azizah Amran, Saad Salahuddin Musa, Masayuki Ochiai, and Su Shiung Lam

Subjects
fluid dynamic bearing, modified spiral geometry, pressure distribution, air leakages, Physics, QC1-999, Engineering (General). Civil engineering (General), TA1-2040, Mechanical engineering and machinery, TJ1-1570, Chemistry, QD1-999
Abstract

This research focuses on the optimum design of fluid dynamic bearing (FDB) named modified spiral design. The objective is to improve the pressure and velocity distribution inside the FDB. In this paper, the current spiral design has 12 number of grooves while the modified spiral design has 24 number of grooves. Both design can be classified into two, bearing with seal and without seal. Air was chosen to replace the oil as the lubricant. Results show that the modified spiral bearing design has comparable characteristics compared to conventional spiral design in terms of pressure and velocity distribution. Modified spiral geometries also shows a tendency to replace the function of seals in FDB. This makes it possible to simplify bearing design without using any seal just by modifying its geometries based on novel modified spiral geometries. Experimental verifications also proved that the modified spiral bearing design has better air leakage control compared to the conventional ones. This phenomenon occurs in both design parameters, where when the designs are compared with respect to increase of rotational speed and air film thickness.

Published
2018
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2. Characteristics of Modified Spiral Thrust Bearing through Geometries and Dimension Modifications

Author

Binti Marusman Norliza, Shiung Lam Su, Yuta Sunami, Bin Musa Saad Salahuddin, Bin Ibrahim Mohd Danial, Binti Amran Siti Nur Azizah, and Masayuki Ochiai

Subjects
0209 industrial biotechnology, Materials science, QC1-999, Fluid bearing, 02 engineering and technology, air leakages, Seal (mechanical), law.invention, 020901 industrial engineering & automation, 0203 mechanical engineering, law, TJ1-1570, Mechanical engineering and machinery, Lubricant, QD1-999, Spiral, Bearing (mechanical), modified spiral geometry, Physics, Rotational speed, Mechanics, Engineering (General). Civil engineering (General), pressure distribution, Surfaces, Coatings and Films, Chemistry, 020303 mechanical engineering & transports, Thrust bearing, Current (fluid), TA1-2040, fluid dynamic bearing
Abstract

This research focuses on the optimum design of fluid dynamic bearing (FDB) named modified spiral design. The objective is to improve the pressure and velocity distribution inside the FDB. In this paper, the current spiral design has 12 number of grooves while the modified spiral design has 24 number of grooves. Both design can be classified into two, bearing with seal and without seal. Air was chosen to replace the oil as the lubricant. Results show that the modified spiral bearing design has comparable characteristics compared to conventional spiral design in terms of pressure and velocity distribution. Modified spiral geometries also shows a tendency to replace the function of seals in FDB. This makes it possible to simplify bearing design without using any seal just by modifying its geometries based on novel modified spiral geometries. Experimental verifications also proved that the modified spiral bearing design has better air leakage control compared to the conventional ones. This phenomenon occurs in both design parameters, where when the designs are compared with respect to increase of rotational speed and air film thickness.

Published
2018

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