Application of disturbance-observer-type velocity estimator to electroacoustic absorber for noise absorbing
نویسندگان
چکیده
Direct impedance control (DIC) technique used for an electroacoustic absorber in this paper requires a pair of pressure and velocity sensor. However, it can be quite costly to develop array system of this electrostatic absorber for acoustically large space. To overcome this problem, in this paper instead of using velocity sensor, disturbance-observer-type velocity estimator is applied to DIC technique for the electroacoustic absorber. In order to verify the practicality of this technique, a robust velocity estimation performance of disturbance-observer-type velocity estimator to acoustic load change of the loudspeaker diaphragm is demonstrated experimentally. Next, its velocity estimation performance is verified after diaphragm velocity is induced both by external pressure and applied DIC voltage. Finally, the possibility of applying disturbance-observer-type velocity estimator to electroacoustic absorber is verified through the measurement of sound absorption coefficients. In this paper, the possibility for the real space acoustic control using array system of electroacoustic absorber using DIC technique is presented.
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