Abstract
Infrastructure projects involving transportation networks underground such as railways and roadways have strict ventilation requirements for fire and smoke and engine exhaust control. The fans used for these projects are often very large and very loud compared to typical building equipment. Transit autorities typically have criteria regarding A-weighted decibel levels in and around the tunnel environment to ensure audibilty of emergency announcements and acceptablility of environmental sound levels. Fan and duct silencers as well as acoustical panels play critical roles in meeting maximum sound level criteria at property lines and at track and platform levels. Due to high airflow rates, the design, placement, and configuration of noise control products must be carefully considered to ensure adequate system performance. This paper will review various issues and considerations encountered in tunnel ventilation noise control projects and present typical solutions and design practices with examples.
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