Comparison of facade noise reduction measurement methods: Field results

Abstract

Many projects require acoustical measurements of facade noise reduction be conducted to verify that Building Code, “green” rating systems (e.g., LEED), or other project interior noise criteria are met. In addition, federally funded airport sound insulation programs in the United States require facade noise reduction measurements be conducted to verify the eligibility of residences receiving sound insulation treatments. Currently, there exists a variety of standards to measure facade noise reduction (e.g., ASTM E966, ISO 16283-3, SAE ARP 6973). These standards employ various measurement methods: artificial exterior noise source, calibrated exterior noise source, line source, etc. In addition, these standards provide guidance on the location of exterior microphones (flush versus near facade) and correction factors to be applied to the data. Recently, a field comparison of three measurement methods was made at multiple residences: artificial exterior noise source, artificial interior noise source, and flush versus near microphone position. This is follow-on research from the National Academies of Science Airport Cooperative Research Project 02-51 and its purpose is to determine whether valid facade noise reduction measurements can be made with the loudspeaker located at the interior of the residence. A comparison of results across the measurement methods will be presented.