Numerical Comparison of Active Acoustic and Structural Noise Control in a Stiffened Double Wall Cylinder

摘要: The active acoustic and structural noise control characteristics of a double wall cylinder with without ring stiffeners were numerically evaluated. An exterior monopole was assumed to acoustically excite the outside at an cavity resonance frequency. Structural modal vibration properties inner outer shells analyzed by post-processing results from finite element analysis. A boundary approach used calculate response coupled structural-acoustic interaction. In frequency region interest, below 500 Hz, all resonant modes found be slow nonresonant dominant. Active sound transmission achieved forces applied or shell, monopoles placed just shell. least mean square technique minimize interior pressures nodes data recovery mesh. Results showed that single resulted in better than six distributed point either one shells. Adding structure constrained vibrations shells, making stiffer associated higher frequencies. obtained for stiffened configurations less unstiffened cylinder. cases, controlled into forces.