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Analytical and experimental evaluation of magnetic field effect on sound transmission loss of MR-based smart multi-layered panels

机译：磁场对基于MR的智能多层板声音传输损耗的影响的分析和实验评估

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摘要

Investigations are made to determine the effect of magnetic field on the Sound Transmission Loss (STL) of smart multilayered panels incorporating MR layers. The acoustic model of a multi-layered panel containing MR fluid is developed analytically using the elastic model with complex modulus for the MR layer. The STL of the panel is then calculated based on the analytical model. Experimental work comprises two major parts: rheology tests and acoustic (STL) measurements. Rheology tests are conducted using a MCR300 rheometer. Characteristics of the MR fluid (loss/storage moduli) are determined in magnetic fields where current varied within 0.2-1.8 Amp. Acoustic measurements are made with a special impedance tube equipped with a magnetic chamber designed and fabricated to apply the field on the MR fluid. Test samples are subjected to two external fields of 145 mT and 340 mT. Analytical results show that increasing the magnetic field from 0.2 A to 1.8 A raises the STL to 30 dB for a wide range of frequencies (f< 3 kHz). However, in some frequencies, especially those above 3 kHz, increasing the field leads to a decline in the STL values. In order to validate the analytical model, theoretical results are compared with those obtained from the experiments. Good agreement is found especially at frequencies below 2500 Hz.
机译：已进行调查以确定磁场对结合了MR层的智能多层面板的声传输损耗（STL）的影响。使用具有复数模量的MR层弹性模型，分析性地开发了包含MR流体的多层面板的声学模型。然后根据分析模型计算面板的STL。实验工作包括两个主要部分：流变测试和声学（STL）测量。使用MCR300流变仪进行流变测试。在电流在0.2-1.8 Amp范围内变化的磁场中确定MR流体的特性（损耗/存储模量）。声学测量是通过配备有磁腔的特殊阻抗管进行的，磁腔设计和制造用于将场施加到MR流体上。测试样品要经受两个145 mT和340 mT的外部磁场。分析结果表明，在很宽的频率范围（f <3 kHz）下，将磁场从0.2 A增加到1.8 A会使STL上升到30 dB。但是，在某些频率中，尤其是3 kHz以上的频率，增大磁场会导致STL值下降。为了验证分析模型，将理论结果与实验结果进行了比较。尤其在频率低于2500 Hz时，发现有很好的一致性。

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