Engine Exhaust Noise Control - Soundproof …

Engine Exhaust Noise ControlJerry G. Lilly, Acoustics, , to TC Exhaust Noise ControlnReactive MufflersnAbsorptive SilencersnReactive/Absorptive MufflersnTail Pipe DesignnTuned ResonatorsnProject ExamplesThe above are the subjects that we will data will also be presented from field tests:One an example of a project failure and the other abig TC Exhaust ConsiderationsThe Exhaust system of a generator hasseveral inherent design problems that mustbe considered. These characteristics imposesevere limitations on what can be done tosilence the Engine Exhaust Noise :nVery High Noise (100 to 120 dBA @ 1 m)nHigh Temperatures (950 to 1050 F)nHigh Velocities (5,000 to 15,000 fpm)nCombustion By-Products (soot & corrosion)nPipe Thermal ExpansionASHRAE TC Characteristicsn Insertion Loss (dB)depends on design, size and frequencyn Pressure Drop (inches H2O or Hg)depends on velocity & designn Self-Generated Noise (dB ref.)

Unsilenced Exhaust Noise n Unsilenced engine exhaust noise is broad-band with highest levels at low frequencies n Data compares 6-cyl. 150 KW and 500 KW engines with a 16-cyl. 2000 KW engine (all

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