Noise and vibration measurements on a cogenerator plant

Active noise control (ANC) aims at reducing a noise source at a listening point by destructive interference with a reversed phase noise emitted by one or more controlling devices. These data are from an active vibration control (AVC) system applied to a wall of the metal box of a cogeneration plant. It makes use of electro-dynamic shakers as controllers and accelerometers as error and reference signals. The algorithm employed for generating the cancelling signals is a single-reference, single-input multiple-output (MIMO) Filtered-X Normalized Least Mean Square (FxNLMS). It has been implemented in a Virtual Studio Technology (VST) plugin. The effectiveness of the solution is first demonstrated in a laboratory experiment. Then, the results obtained on the cogenerator are presented, showing remarkable performance also in the real-world application, with a reduction of 17.5 dB, 13.2 dB, and 11.8 dB at the frequencies 100 Hz, 112.5 Hz, and 125 Hz, respectively.