Abstract
The transmission characteristics of a duct with eccentric three slits are numerically analyzed and measured with various slit's size. The three-dimensional structure of sound field in the duct is computed with a finited difference method. The present results show that effective frequency range on sound attenuation becomes to be wider, compared with the case of a single eccentric slit or that of concentric three slits. The computed transmission coefficient give excellent agreement with our experimental data.
