CONTENTS
1 NOISE MONITORING METHODOLGY ........................................................................................... 3 1.1 Introduction ............................................................................................................................... 3 1.2 Construction Noise Monitoring ................................................................................................. 3 1.2.1 Rationale ...................................................................................................................... 3 1.2.2 Method .......................................................................................................................... 3 1.2.3 Equipment and Procedure ............................................................................................ 4 1.2.4 Results .......................................................................................................................... 4
1.3 Converter Station Noise Monitoring ......................................................................................... 4 1.3.1 Rationale ...................................................................................................................... 4 1.3.2 Method .......................................................................................................................... 4 1.3.3 Equipment and Procedure ............................................................................................ 4 1.3.4 Results .......................................................................................................................... 5
GLOSSARY Glossary
1. Sound Pressure Level (Lp) The basic unit of sound measurement is the sound pressure level, which is measured on a logarithmic scale and expressed in decibels (dB). The logarithmic scale makes it easier to manage the large range of audible sound pressures, and also more closely represents the way the human ear responds to differences in sound pressure:
Lp = 20 log10 (p/po) where p = RMS (root mean square) sound pressure; and p0 = reference sound pressure 2 x 10-5 Pa.
2. Sound Power Level (LW)
The sound power level is the sound power output of a source, also measured on a logarithmic scale and expressed in decibels (dB). LW = 10 log10 (W/Wo) where W = sound power; and Wo = reference sound power 1 x 10-12 W.
EAOW
Noise Prediction Methodology P41388
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