The evaluation of noise level in hand-held pneumatic tools (rock drill) by "pneurop cagi test code" method
Keywords:Acoustic variables measurement, Acoustic wave transmission, Codes (symbols), Drills, Hand tools, Metric system, Mining drills, Pneumatic equipment, Pneumatic tools, Pneumatics, Rocks, Spheres, Ultrasonics, Continuous, Frequency analyses, ISO standards, Noise assessments, Noise levels, Overall sound pressure levels, Sound level meters, Sound power levels, Sound pressure levels, Sound pressures, Test codes, Total doses
AbstractThe noise and vibration created in hand-held pneumatic tools such as Rock drills, used in Lashotor stone mines in Isfahan, is evaluated by PNEUROP CAGI TEST CODE method. Rock Drill produces a continuous noise based on ISO standard and so the total dose of duration and level of the various noises are calculated. The measurements are performed with the center of the machine, 1 meter above a reflecting floor, while the noise assessment is done on the spherical area. Sound power level is calculated by using a sound pressure level so that the drill is located in the center of a hypothetical sphere. The results show that the overall sound pressure level based on ANSI S5.1-1971 is equal to 93.63 dB. It is also seen that a gradual increase in sound pressure generated by rock drill from frequency of 31.5 Hz to 4000 Hz with a fall in 1000 Hz frequency is due to sound level meter in a frequency analysis of 1/1band octave.
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