Rush Engineering, Inc.

NOX Induction Stack Noise Reduction

Neighborhood residents complaining of acoustic noise
emitting from manufacturing facility blower sound enclosure.

Blower Facility Sound Enclosure

 

 

One half mile diameter acoustic survey reveals significant noise present in neighborhood.
 Acoustic Survey

 

 

Residential acoustic signature identifies noise frequencies.
 Local Noise Signature

 

 

NOX scrubber stack contains  residential signature acoustic energy frequencies.
 NOX Stack

 

 

NOX Scrubber Stack tested for "singing" of fiberglass walls.
NOX Stack Sound and Vibration Testing

 

 

NOX scrubber stack acoustically evaluated for "singing" throughout operating range.
NOX Stack Adjacent Sound Pressure Measured Through Operating Range.

 

 

NOX scrubber stack wall vibration indicates "singing" at 1/REV and at 2/REV.
NOX Stack Vibration Measured Through Operating Range.

 

 

NOX scrubber gas stream pulsation dominating near field noise readings.
NOX Stack Gas Stream Pulsation Dominant.

 

 

NOX scrubber gas stream pulsation noise radiating as a point source toward neighborhood.
NOX Stack 125 Hz octave band.

 

 

Internal acoustic silencer added to NOX scrubber stack for 20 dB noise attenuation in neighborhood.
NOX Stack Silencer Modification.

 

 

 Design objective for residential noise abatement with inline stack silencer.
 Local Noise Signature

 

 

View of modified stack with internal silencer installed.
 Local Noise Signature After Installation of Silencer

 

 

 Design result in residential noise abatement with inline stack silencer installed.
 Local Noise Signature After Installation of Silencer



 

 

RESULTS:
Industrial plant reduces neighborhood noise, and complaints from residents cease.

If it's dynamic, it's a Rush job!

Contact Rush Engineering, Inc.

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