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《Study on Active Noise Control Using Piezoelectric Material》
ZHU Cong-yun;NIE Jian-jun;HUANG Qi-bai
   2010, 30 (3): 16-20.   DOI: 10.3969/j.issn.1006-1355.2010.03.005
Abstract （3307）      PDF（pc） （265KB）（2043）       Save
An active absorption method using piezoelectric material is proposed in this paper. In this method, a piezoelectric ceramic is used as the absorption material in the active absorption system. Two microphones are placed in the front of the piezoelectric ceramic with equal distance from it to measure the incidence plane wave and the reflecting wave. The voltage is applied on the surface of the piezoelectric ceramic in order to eliminate the reflection wave. Finally, simulation of the active absorption control is carried out by means of the MATLAB code for the incidence plane wave with different frequencies. Results show that the proposed method is effective and feasible.
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《Study on Radiating Sound Roughness of AcousticStructure Coupling Field in Sealed Cavity》
YUAN Ji-xuan;HUANG Qi-bai;WANG Jian-liang
   2010, 30 (1): 59-62.   DOI: 10.3969/j.issn.1006-1355.2010.01.059
Abstract （2065）      PDF（pc） （946KB）（1301）       Save
Based on the finite element model of acousticstructure coupling field in a sealed cavity and the improved Senthares nonharmonic psychoacoustics model, the sound pressure level of the internal radiating sound due to the excitation of the harmonic force exerted on the shell of the cavity is calculated. The acousticstructure coupling effect is considered. The sound roughness caused by the rapid modulation at the evaluation point is analyzed. Moreover, the effects of the sound pressure level of the modulated sound, the frequency of the modulated sound and the stiffness of the shell on the radiating sound roughness are studied. This work provides the data and method for determination of the internal radiating sound roughness in the cavity caused by the rapid modulation of the other sound sources.
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