基于传递矩阵法的电流变液中声波传递特性

Research of acoustic wave propagation characteristics in electrorheological fluids by transmission matrix method

基于声波传递矩阵法,推导了声波在电流变液中的波动方程,建立了电流变液非均匀介质中的声波传播模型,得到了声波的传播矩阵,进而计算电流变液材料表面的反射系数.在数学模型基础上,考虑电流变液梯度声阻抗与海水及钢板两分界面上声阻抗匹配,对不同阻抗分布的电流变液表面声波反射系数进行数值模拟,优化了声阻抗分布.结果表明电流变液的梯度阻抗明显降低了结构表面的声波反射系数.

The model of acoustic wave propagation in an inhomogeneous layer was established by wave equations. The transmission matrix of this inhomogeneous layer was obtained and its energy reflection coefficients were derived. From mathematic model,the reflection coefficients for inhomogeneous layer with different impedance profile were calcultated,where the gradient acoustic impedance was matched with the acoustic impedances of water and steel. Then the better impedance profile was got. The calculated results show that the reflection coefficient of acoustic wave is reduced obviously under the conditional of electrorheological fluid′s acoustic impedance matching,which could especially useful for the matching acoustic impedance between a solid transducer and fluids.