矩形平板和矩形阶梯板的辐射声场指向性

发布时间：2018-01-16 06:36

本文关键词：矩形平板和矩形阶梯板的辐射声场指向性　出处：《陕西师范大学学报(自然科学版)》2017年01期 　论文类型：期刊论文

【摘要】：利用有限元方法,提取板中各微元振幅,迭代计算了平板和阶梯板所产生的辐射声场,并测试了所加工的平板和阶梯板的声场指向性。结果表明:在平板中沿x轴与平板垂直的平面,声场指向性在轴线方向存在主瓣,但是在其他方向同时存在副瓣,副瓣声能分布较多,声能分散。在阶梯板中沿x轴与阶梯板垂直的平面,声场指向性在轴线方向存在开角较小的主瓣,声能分布主要集中在轴线方向;在沿y轴与阶梯板垂直的平面,声场指向性在轴线方向也存在开角较小的主瓣,同时在轴线方向之外存在副瓣,但副瓣声能分布较少,故声能主要集中分布在轴线方向。因此,阶梯板的声场指向性优于平板指向性,实验测试与理论计算结果相吻合。
[Abstract]:Using the finite element method, the amplitude of each microelement in the plate is extracted, and the radiation sound field produced by the plate and step plate is calculated iteratively. The sound field directivity of the processed plate and stepped plate is tested. The results show that there are main lobes in the axis direction of the sound field in the plane perpendicular to the x axis in the flat plate. But there are sidelobe in other directions, the sidelobe sound energy distribution is more, sound energy is dispersed. In the ladder plate, along the plane of x axis and step plate, there is a main lobe with small opening angle in the axis direction of the sound field directivity. The distribution of sound energy is mainly concentrated in the axis direction. In the plane perpendicular to the stepped plate along the y axis, there is also the main lobe with small opening angle in the axis direction, and the sidelobe outside the axis direction, but the acoustic energy distribution of the sidelobe is less. Therefore, the acoustic energy is mainly distributed in the axis direction. Therefore, the directivity of the sound field of the stepped plate is better than that of the plate, and the experimental results are in good agreement with the theoretical calculation results.
【作者单位】：陕西师范大学物理学与信息技术学院陕西省超声学重点实验室;
【基金】：国家自然科学基金(11374201)
【分类号】：O422.6
【正文快照】： 由弯曲振动薄板辐射体与纵振换能器组成的辐射系统,结合了纵振换能器的高效率、大功率及弯曲振动辐射薄板的低辐射阻抗、大辐射面等特点,在超声除尘[1]、超声清洗[2]、工业涂层中超声除泡[3]、食品加工中超声干燥[4]等领域获得了广泛的应用。常见薄板辐射体有圆形和矩形两大类

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