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本文由气流扬声器的等效电路导出了直接决定感应式气流扬声器声学特性的输入阻抗和位移振幅频率响应。在忽略阻尼的条件下,进行了理论分析。分析表明它与普通的电动式气流扬声器的特性不同,感应式气流扬声器使用恒流源时在中频段具有平直的频率特性。这时,决定感应式气流扬声器中频段位移振幅的主要参量是扬声器的初次级线圈的互感量,磁感应强度与音圈的直径,而其高频特性下降的特点也与普通电动式气流扬声器不同。感应式气流扬声器的高频响应不决定于振动系统的机械共振频率而与音圈的质量和电感有关。在考虑阻尼影响的情况下,对感应式气流扬声器的频率响应进行了计算,并给出实验模型的测量结果。这些,可供气流扬声器研制、设计和使用人员参考。
In this paper, the equivalent impedance of the airflow loudspeaker is used to derive the input impedance and the frequency response of the displacement amplitude, which directly determine the acoustic characteristics of the inductive airflow loudspeaker. Under the condition of ignoring the damping, a theoretical analysis is carried out. The analysis shows that it has different characteristics from the ordinary electric air flow loudspeaker. The inductive air flow loudspeaker has a flat frequency characteristic in the middle frequency range when using a constant current source. At this time, the main parameters of the displacement amplitude of the inductive airflow speaker in the frequency band are the mutual inductance, the magnetic induction and the diameter of the voice coil of the primary coil of the speaker, and the characteristics of the decreased high-frequency characteristic are also different from those of the ordinary electric air-flow speaker. The high frequency response of the inductive airflow loudspeaker does not depend on the mechanical resonance frequency of the vibration system but on the quality and inductance of the voice coil. Taking the damping effect into account, the frequency response of the inductive airflow loudspeaker is calculated and the experimental results are given. These are available for the development of airflow speakers, design and use of personnel reference.