《隔声罩与声屏障》PPT课件.ppt
噪声与振动控制技术,主讲:盛美萍,Prof.Sheng MeipingNorthwestern Polytechnical University,西北工业大学精品课程专业核心课程,振动与噪声控制技术,本 讲 内 容,Prof.Sheng MeipingNorthwestern Polytechnical University,隔声罩与声屏障,Prof.Sheng MeipingNorthwestern Polytechnical University,隔 声 罩,将噪声源封闭在一个相对小的空间内,以减少向周围辐射噪声的罩状壳体,称为隔声罩。这是在声源处控制噪声的有效措施。隔声罩通常是兼有隔声、吸声、阻尼、隔振和通风、消声等功能的综合结构体。,Prof.Sheng MeipingNorthwestern Polytechnical University,Prof.Sheng MeipingNorthwestern Polytechnical University,隔声性能评价,插入损失 隔声罩在设置前后同一接收点的声压级之差,Prof.Sheng MeipingNorthwestern Polytechnical University,插入损失,Prof.Sheng MeipingNorthwestern Polytechnical University,Prof.Sheng MeipingNorthwestern Polytechnical University,声 屏 障,声屏障 用来阻挡声源与接收点之间直达声的障板,Prof.Sheng MeipingNorthwestern Polytechnical University,隔声原理:可以将高频声反射回去,使屏障后形成声影区,在声影区内噪声明显降低。对低频声,由于绕射的结果,隔声效果较差。,Prof.Sheng MeipingNorthwestern Polytechnical University,声屏障设计、加工与安装 来自深圳中雅机电实业有限公司,Prof.Sheng MeipingNorthwestern Polytechnical University,来自设计生产一线的资料,实验预告,构件隔声量测试,Prof.Sheng MeipingNorthwestern Polytechnical University,