![](http://vip.img.dns4.cn/pic/128115/jiyaxiang/20160330133546_8382_zs_sy.jpg)
![](http://vip.img.dns4.cn/pic/128115/jiyaxiang/20160330133554_7507_zs_sy.jpg)
![](http://vip.img.dns4.cn/pic/128115/jiyaxiang/20160330133547_6883_zs_sy.jpg)
![](http://vip.img.dns4.cn/pic/128115/jiyaxiang/20160330133555_8137_zs_sy.jpg)
![](http://vip.img.dns4.cn/pic/128115/jiyaxiang/20160330133548_7353_zs_sy.jpg)
![](http://vip.img.dns4.cn/pic/128115/jiyaxiang/20160330133549_7084_zs_sy.jpg)
![](http://vip.img.dns4.cn/pic/128115/jiyaxiang/20160330133556_7088_zs_sy.jpg)
式中:t--板厚(毫米)d--孔径(毫米)p--穿孔率(%)kr--声阻系数kr=(1+x2/32)1/2+(2x)1/2/8×d/tkm--声质量系数km=1+{1+[1/(9+(x2/2))]}+0.85d/t
![](http://vip.img.dns4.cn/pic/128115/jiyaxiang/20160330133550_7284_zs_sy.jpg)
![](http://vip.img.dns4.cn/pic/128115/jiyaxiang/20160330133556_7088_zs_sy.jpg)
![](http://vip.img.dns4.cn/pic/128115/jiyaxiang/20160330133549_7084_zs_sy.jpg)
![](http://vip.img.dns4.cn/pic/128115/jiyaxiang/20160330133554_7507_zs_sy.jpg)
![](http://vip.img.dns4.cn/pic/128115/jiyaxiang/20160330133547_6883_zs_sy.jpg)
![](http://vip.img.dns4.cn/pic/128115/jiyaxiang/20160330133548_7353_zs_sy.jpg)
![](http://vip.img.dns4.cn/pic/128115/jiyaxiang/20160330133555_8137_zs_sy.jpg)
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