| タイトル | Active control of acoustic pressure fields using smart material technologies |
| 本文（外部サイト） | http://hdl.handle.net/2060/19940008881 |
| 著者（英） | Banks, H. T.; Smith, R. C. |
| 著者所属（英） | Institute for Computer Applications in Science and Engineering |
| 発行日 | 1993-06-01 |
| 言語 | eng |
| 内容記述 | An overview describing the use of piezoceramic patches in reducing noise in a structural acoustics setting is presented. The passive and active contributions due to patches which are bonded to an Euler-Bernoulli beam or thin shell are briefly discussed and the results are incorporated into a 2-D structural acoustics model. In this model, an exterior noise source causes structural vibrations which in turn lead to interior noise as a result of nonlinear fluid/structure coupling mechanism. Interior sound pressure levels are reduced via patches bonded to the flexible boundary (a beam in this case) which generate pure bending moments when an out-of-phase voltage is applied. Well-posedness results for the infinite dimensional system are discussed and a Galerkin scheme for approximating the system dynamics is outlined. Control is implemented by using linear quadratic regulator (LQR) optimal control theory to calculate gains for the linearized system and then feeding these gains back into the nonlinear system of interest. The effectiveness of this strategy for this problem is illustrated in an example. |
| NASA分類 | NUMERICAL ANALYSIS |
| レポートNO | 94N13354
NASA-CR-191480
NAS 1.26:191480
ICASE-93-31
AD-A269225 |
| 権利 | No Copyright |
