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Acoustic Analysis Using Sound Level Meter to Determine the Period of Usage of the Spindle Bearing of a Radial Drilling Machine

100%

Charles S. , Vijaya J. D. , Charles S. , Vijaya J. D.

Acoustic Analysis Using Sound Level Meter to Determine the Period of Usage of the Spindle Bearing of a Radial Drilling Machine

89%

Charles S. , Vijaya J. D.

Archives of Acoustics

2019

tom Vol. 44, No. 3

505--510

The condition monitoring techniques like acoustic emission, vibration analysis, and infrared thermography, used for the failure diagnosis of bearings, require longer processing time, as they have to per form acoustical measurement followed by signal processing and further analysis using special software. However, for any bearing, its period of usage can be easily determined within an hour, by measuring the bearing sound, using sound level meter (SLM). In this paper the acoustical analysis of the spindle Bering of a radial drilling machine was performed using SLM, by measuring the sound pressure level of the bearing in decibels, for different frequencies, while muting all the other noises. Then using an experimental set up, two database readings were taken, one for new bearing and the other for completely damaged bearing, both are SKF6207, which itself is the spindle bearing. From these three sets of sound pressure level readings, the period of usage of the spindle bearing, was calculated using an interpolation equation, by substituting the life of the bearing from the manufacturer’s catalogue. Therefore, for any machine with a SKF6207 bearing, its usage time can be estimated using the database readings and one measurement on that machine, all with the same speed.

Three dimensional MHD Casson fluid flow over a stretching surface with variable thermal conductivity

71%

Ganga B. , Charles S. , Abdul Hakeem A. K. , Nadeem S.

Journal of Applied Mathematics and Computational Mechanics

2021

tom Vol. 20, nr 1

25--36

The three-dimensional magnetohydrodynamic (MHD) boundary layer flow of a Casson fluid over a stretching surface set into a porous medium with variable thermal conductivity and heat generation/absorption has been researched. Conservation laws of mass, momentum and energy are changed into ordinary differential equations, which are numerically dealt with by applying the fourth order Runge-Kutta integration scheme in relationship with shooting procedure. The dimensionless velocity, temperature, skin friction coefficient and the local Nusselt number inside the boundary layer are processed and examined through tables and illustrations for various physical parameters. The numerical outcomes obtained for the specific case are sensible in great concurrence with the existing results. Results indicate that momentum boundary layer reduces for the Hartman number and Casson fluid parameter. Temperature is found as an enlightened function for the heat generation and thermal conductivity parameter.

Skutecznosc emodepsydu iprazikwantelu w tabletkach [Profender Tabletki dla psow] w zwalczaniu dojrzalych i niedojrzalych postaci doroslych Ancylostoma caninum i Uncinaria stenocephala u psow

45%

Schimmel A. , Altreuther G. , Schroeder I. , Charles S. , Cruthers L. , Ketzis J. , Kok D. J. , Kraemer F. , McCall J. W. , Krieger K. J.

2010

tom 19

nr 03

277-280