平面声波 meaning in English

plane sound wave

Theoretical calculation about reflection and refraction of plane sound wave on parallel interface
平面声波在平行分界面上反射和折射的理论计算
In the last , a experiment is carried out , the experiment result denotes that the absorption effect is smart in middle and low frequent and imperfect in high frequent for passive absorption is reigning
最后进行了实验，实验结果表明了在中低频平面声波入射时，采用本方法的吸声效果改进比较明显，但在高频平面声波入射时，采用本方法的吸声效果就不是很明显，此时吸声主要是依靠吸声材料被动吸声。