A pneumatic winch is supported on the spring tension cable mesh right in the center of...
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A pneumatic winch is supported on the spring tension cable mesh right in the center of a 15 m × 15m x 15m full anechoic chamber for acoustic characterization tests. A microphone at 7.5 m away from the machine measures the sound pressure levels recorded in the table, when the machine is operational. a) Calculate the unweighted overall sound pressure level at the microphone position over the entire frequency range of interest. [5] b) Determine the sound power emitted by the machine, as well as the sound power level. [9] c) Determine the A-weighted overall sound pressure level at the microphone position over the entire frequency range of interest. [4] Centre Frequency 63 125 250 500 1000 2000 4000 8000 Sound Pressure Level [Lp] 52 58 78 80 85 88 76 77 A-weighting [dB] -26.6 -16.1 -8.6 -3.2 0 1.2 1.0 -1.1 c=344 m/s p=1.2 kg/m³ A=4tr² A pneumatic winch is supported on the spring tension cable mesh right in the center of a 15 m × 15m x 15m full anechoic chamber for acoustic characterization tests. A microphone at 7.5 m away from the machine measures the sound pressure levels recorded in the table, when the machine is operational. a) Calculate the unweighted overall sound pressure level at the microphone position over the entire frequency range of interest. [5] b) Determine the sound power emitted by the machine, as well as the sound power level. [9] c) Determine the A-weighted overall sound pressure level at the microphone position over the entire frequency range of interest. [4] Centre Frequency 63 125 250 500 1000 2000 4000 8000 Sound Pressure Level [Lp] 52 58 78 80 85 88 76 77 A-weighting [dB] -26.6 -16.1 -8.6 -3.2 0 1.2 1.0 -1.1 c=344 m/s p=1.2 kg/m³ A=4tr²
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Related Book For
Vector Mechanics for Engineers Statics and Dynamics
ISBN: 978-0073212227
8th Edition
Authors: Ferdinand Beer, E. Russell Johnston, Jr., Elliot Eisenberg, William Clausen, David Mazurek, Phillip Cornwell
Posted Date:
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