| 一种声学发射换能器的实验研究 |
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| 引用本文： | 王正良,陈善飞,郑敏华.一种声学发射换能器的实验研究[J].电声技术,2009,33(6):29-32. |
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| 作者姓名： | 王正良 陈善飞 郑敏华 |
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| 作者单位： | 浙江万里学院,应用物理研究所,浙江,宁渡,315101 |
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| 基金项目： | 浙江省科技攻关项目，宁波市科技攻关项目 |
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| 摘 要： | 采用有强磁化特性的磁性液体作为换能器中制动元件，实验建立一个交变的梯度磁场作用于磁性液体，通过压电陶瓷换能器检测到磁性液体振动而产生的声波，发现磁性液体在交变梯度磁场作用下有磁致伸缩效应。导出了磁性液体振动特性的动力学一般方程，揭示了交变的梯度磁场作用引起了交变的磁性液体的内压强，从而引起磁性液体的体积发生伸缩，产生机械振动，激励空气产生声波的机理。以磁性液体为制动元件可以研制较理想的大功率低频宽带声学发射换能器。
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| 关 键 词： | 换能器 机械振动 交变的梯度磁场 |
Experimental Study on Acoustics Emission Transducers With Ferrofluids Braking Element |
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| WANG Zheng-liang,CHEN Shan-fei,ZHENG Min-hua.Experimental Study on Acoustics Emission Transducers With Ferrofluids Braking Element[J].Audio Engineering,2009,33(6):29-32. |
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| Authors: | WANG Zheng-liang CHEN Shan-fei ZHENG Min-hua |
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| Affiliation: | Institute of Applied Physics;Zhejiang Wanli University;Ningbo Zhejiang 315101;China |
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| Abstract: | Ferrofluids with high magnetization property are used as braking element in transducer. Laid ferrofluids are in alternative magnetic field. And the signals are converted into electrical signals by piezoelectric ceramic transducer. Through the sound waves generated by magnetostrictive,vibration of ferrofluids can be detected. Ferrofluids in alternative magnetic field is discovered that it has magnetostrictive effect. By means of theoretical calculations and analysis,the commonly power mechanics equation form... |
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| Keywords: | transducer mechanical vibration alternative magnetic field |
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