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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Capstone Model C30 Acoustic Emissions Sound Power Measurements Noise measurements were also made to estimate the sound power of the primary noise sources. The measurement grid used for measuring the sound power of the open package was based on ANSI S1.2-1962, ìStandard Method for the Physical Measurement of Sound.î The intent of this method was to determine the acoustic sound power of the open package by measuring surface averaged noise levels over a theoretical sphere. The resulting sound power is determined by the following: Lw =Lp +20logR+10.8dB Where: Lp is the surface averaged sound pressure level, and R is the radius in meters. The sound power measurements for both the inlet and the exhaust were made on the assumption that the sound power in the acoustic near field of the source (inlet or exit) does not change significantly with distance, as long as the microphone is close to the source. Once this assumption was made, sound intensity could be calculated from the surface-averaged sound pressure level measurements taken near the source. The correlation of sound intensity to sound pressure level is as follows: Li =10logI/Iref =Lp ñ10logK Where K is negligible at ambient temperatures and pressures. The units of sound intensity are watts per square meter. Iref = 10-12 W/m2. This equation can be used to calculate the acoustic power by multiplying the surface area of the source times the sound intensity. The acoustic sound power level can then be calculated using the following: Lw = 10 log W/Wref Where Wref is 10-12 watts. The measurement area for the inlet with the silencer was the annulus area between inlet disk and the inner part of the lip of the outer casting on the standard production inlet (approximately 70 in2). The measurement area used for the inlet without the silencer was the annulus area of the stator-housing inlet (approximately 34 in2). The measurement area used for the untreated exhaust was an 8-inch diameter hemisphere center on the centerline of the exhaust exit (approximately 100 in2). 410025-001 Rev A (September 2002) Page 7 of 36 This information is proprietary to Capstone Turbine Corporation. Neither this document nor the information contained herein shall be copied, disclosed to others, or used for any purposes other than the specific purpose for which this document was delivered. Capstone reserves the right to change or modify without notice, the design, the product specifications, and/or the contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction.PDF Image | Guide for Capstone Turbine Model Number
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