An experimental study implementing model reference active structural acoustic control

Date
1993-06-01Author
Clark, Robert L.
Gibbs, Gary P.
Fuller, Chris R.
Metadata
Show full item recordAbstract
Model reference active structural acoustic control is experimentally investigated in this study for physical systems characterized by stationary, narrow-band disturbances in which the acoustic field remains relatively unchanged. The filtered-x version of the multichannel adaptive least-mean-square (LMS) algorithm was implemented on a TMS320C25 digital signal processing board to achieve the desired control approach, and control inputs were generated with piezoelectric actuators. Model reference control provides the designer with a method of replacing acoustic error sensors such as microphones located in the far-field with error sensors such as accelerometers located on the surface of the structure. As opposed to driving the response of the structure to zero at the coordinates of the accelerometers, the response is driven to some predetermined ''reference'' value corresponding to the desired far-field acoustic directivity pattern. In essence, the uncontrolled structure is adaptively modified to behave like the reference structure under acoustic control conditions. Results from this study indicate that the same acoustic directivity pattern can be achieved with model reference control, and the only requirement is that the number of structural sensors used in the control approach is at least equal to the number of control actuators required to achieve the desired acoustic directivity pattern.
Collections
Related items
Showing items related by title, author, creator and subject.
-
A model reference approach for implementing active structural acoustic control
Clark, Robert L.; Fuller, Chris R. (Acoustical Society of America, 1992-09-01)A model reference active structural acoustic control (ASAC) approach is investigated as a method for replacing microphone error sensors located in the acoustic field with accelerometers located on the structure. The suggested ... -
Reduction of sound transmission into a circular cylindrical shell using distributed vibration absorbers and Helmholtz resonators
Esteve, Simon J.; Johnson, Martin E. (Acoustical Society of America, 2002-12-01)A modal expansion method is used to model a cylindrical enclosure excited by an external plane wave. A set of distributed vibration absorbers (DVAs) and Helmholtz resonators (HRs) are applied to the structure to control ... -
Acoustic streaming in a waveguide with slowly varying height
Thompson, Charles (Acoustical Society of America, 1984-01-01)An analysis of acoustic streaming in a two-dimensional waveguide having slowly varying height is presented. Special attention is paid to waveguides with cross sections that are small compared to the acoustic and/or wall ...