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运用电力声类比方法 ,研究有源消声中声源电声阻抗变化规律。首先给出动圈式扬声器总输入电阻抗表达式 ,并分析了声源辐射阻抗对电阻抗的影响关系 ;其次研究了在声抑制和声吸收两种消声状态下 ,次级源电阻抗的变化规律 ,并推导了换能器输入电压与输出振速间的关系 ;最后设计了交流电桥 ,实际测量了两种消声状态下 ,若干频率时次级扬声器电阻抗规律 ,得到了与理论分析一致的结果
The power acoustic analogy method is used to study the variation of electroacoustic impedance in active muffler. Firstly, the expression of the total input electrical impedance of the dynamic loudspeaker is given and the influence of the sound source radiation impedance on the electrical impedance is analyzed. Secondly, the changes of the secondary source electrical impedance under the acoustic noise suppression and the acoustic absorption are studied. The relationship between transducer input voltage and output vibration speed is deduced. Finally, an AC bridge is designed to measure the law of the electrical impedance of the subwoofer at several frequencies under two muffling conditions. The results are consistent with the theoretical analysis the result of