Gas Turbine Handbook : Principles and Practices

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152 Gas Turbine Handbook: Principles and Practices Table 10-1. Acoustical Bandwidths and Weighting Values ——————————————————————————————————— Frequency 1/3 Octave Band Octave Band A Weighting C Weighting Bandwidths, Hz Center Freq. Hz Center Freq. Hz Adjustment, dB Adjustment, dB ——————————————————————————————————— 11.2 - 14.1 12.5 -63.4 -11.2 14.1 - 17.8 16 16 -56.7 -8.5 17.8 - 22.4 20 -50.4 -6.2 ——————————————————————————————————— 22.4 - 28.2 25 -44.7 -4.4 28.2 - 35.5 31.5 31.5 -39.4 -3.0 35.5 - 44.7 40 -34.6 -2.0 ——————————————————————————————————— 44.7 - 56.2 50 -30.2 -1.3 56.2 - 70.8 63 63 -26.2 -0.8 70.8 - 89.1 80 -22.5 -0.5 ——————————————————————————————————— 89.1 - 112 100 -19.1 -0.3 112 - 141 125 125 -16.1 -0.2 141 - 178 160 -13.4 -0.1 ——————————————————————————————————— 178 - 224 200 -10.9 0 224 - 282 250 250 -8.6 0 282 - 355 315 -6.6 0 ——————————————————————————————————— 355 - 447 400 -4.8 0 447 - 562 500 500 -3.2 0 562 - 708 630 -1.9 0 ——————————————————————————————————— 708 - 891 800 -0.8 0 891 - 1,122 1,000 1,000 0 0 1,122 - 1,413 1,250 +0.6 0 ——————————————————————————————————— 1,413 - 1,778 1,600 +1.0 -0.1 1,778 - 2,239 2,000 2,000 +1.2 -0.2 2,239 - 2,818 2,500 +1.3 -0.3 ——————————————————————————————————— 2,818 - 3,548 3,150 +1.2 -0.5 3,548 - 4,467 4,000 4,000 +1.0 -0.8 4,467 - 5,623 5,000 +0.5 -1.3 ——————————————————————————————————— 5,623 - 7,079 6,300 -0.1 -2.0 7,079 - 8,913 8,000 8,000 -1.1 -3.0 8,913 - 11,220 10,000 -2.5 -4.4 ———————————————————————————————————
Gas Turbine Acoustics and Noise Control 153 frequencies and begins to fade at high frequencies. Researchers developed electronic weighting curves or filters for sound level meters to process the sound as the ear would hear it. These weighting curves are commonly known as A, B, C, D, and E and are applied depending upon what is being measured. A and C weightings (or filtering) are the most widely used in environmental acoustics. A sound level meter set to measure A-weighted sound levels captures all the sound energy from 10 Hz to about 12,000 Hz or more and processes the measurement to arrive at a single sound level value. The following figure illustrates the weighting curves as applied to the sound spectra from 10 Hz through 10,000 Hz and the actual weighting values are listed in Table 10-1. An example of performing an overall A-weighted calculation is given in Appendix C-12. Applying the A-weighting curve shown in Figure 10-2 to the noise signature shown in Figure 10-1 results in an overall A-weighted sound level of 120.5 dB. This is a much easier number to deal with than having to always produce a spectrum and show all the discrete sound pressure levels. To continue this simplification approach, the Figure 10-2. Frequency response curves for A and C weighting measurements
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Gas Turbine Handbook: Principles an
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Dedication This book is dedicated t
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Contents PREFACE ..................
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Chapter 13—BOROSCOPE INSPECTION .
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Preface to the Third Edition The ne
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Acknowledgments I wish to thank the
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2 Gas Turbine Handbook: Principles
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Figure 2-3. Courtesy of United Tech
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100 Gas Turbine Handbook: Principle
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Appendix A-2 304 Gas Turbine Handbo
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5. Weather Hood Material __________
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Appendix C-6 Air/Oil Cooler Specifi
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9. Drive Requirements A. Hydraulic
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22. Packaging For Shipment Per Spec
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Parameters Units NH 3 CO H 2 CH 4 C
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.055 Parameters Units 1/0 .88/.12 .
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Koppers Foster Blue Coal Gas Winkle
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