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- Title
Fan Manufacturer Sound Power Data: Trust but Verify.
- Authors
Thalheimer, Erich; Greene, Rob; Poling, Jacob
- Abstract
This article describes the extensive efforts and important conclusions reached by Parsons Brinckerhoff (PB) involving in-tunnel jet fan noise emissions associated with the 1-264 Midtown/ Downtown Tunnels project where more than 50 jet fans were scheduled for installation in four new tunnels connecting Norfolk and Portsmouth, Virginia. PB performed in-tunnel noise predictions during the design phase using the fan manufacturer's published sound power data that indicated in-tunnel noise levels should be compliant with NFPA 502 guidelines. However, when the first jet fans were installed and tested, in-tunnel noise levels were nearly 20 decibels louder than PB had predicted. This led to PB performing in-situ sound power tests of the jet fans in accordance witn ISO 3747 and visiting the fan manufacturer's factory to verify its sound power testing methods. The results proved that the manufacturer's published sound power data were wildly inaccurate and that PB's prediction model algorithm and testing methods were correct. PB then provided guidance to correct the manufacturer's methods and reduce the fan screen noise to comply with the project's in-tunnel noise limit. The conclusion: beware of sound power data provided by fan manufactures; trust but verify its validity.
- Subjects
PARSONS Brinckerhoff Inc.; NOISE control; SOUND energy; ALGORITHM software; DATA management
- Publication
Sound & Vibration, 2017, Vol 51, Issue 2, p10
- ISSN
1541-0161
- Publication type
Article