从一维平面波理论入手分析了超声波声压分布特性。依据多普勒频移原理,在声场的运动方程,连续性方程,波动方程的基础上,建立一个超声波在流动的液体中传播的控制方程。根据轴对称模型的实际特点,简化了所得方程,并求出解析解。结果表明流动液体可以产生声波的衰减。液体的黏滞性是产生超声波衰减的重要原因。超声波的频率较高,液体的黏滞性对超声波衰减影响明显。依据黏滞力与速度梯度的关系,建立一个超声波在黏滞液体传播的控制方程,并依据边界条件求出解析解,反映了媒质黏滞性对超声波传播尤其是衰减特性的影响。
Start with one-dimensional plane wave problem,it analysed ultrasonic sound pressure distributing characteristic.Judge by Doppler shift principle,it build an equation which depict that ultrasonic disseminate in the mobile liquid.According to the characteristic of axial symmetry model, it facilitates and solve the equation.The results indicate that the velocity of mobile liquid can and enhance the sound wave attenuation.Liquid viscositv play an important role in sound wave attenuation.The high frequency of ultrasonic,the more attenuation will produce.According to the relationship between viscous force and velocity gradient,it build an equation which depict that ultrasonic disseminate in the viscous liquid.The boundary conditions is given,the solution is gotten. It reflects the liquid viscosity＇s effects on the diminishing characteristics of the ultrasonic＇s transmission.
参考文献
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