摘要: A proof-of-principle sound absorption system for reducing 1000 Hz pattern noise in vehicle roadnoise is presented. The system utilizes membrane resonance and quarter wavelength side-branch(hereafter, this is called side-branch) re... 展开 A proof-of-principle sound absorption system for reducing 1000 Hz pattern noise in vehicle roadnoise is presented. The system utilizes membrane resonance and quarter wavelength side-branch(hereafter, this is called side-branch) resonance, which allowed the system to absorb noise in a smallersize than existing insulation materials. The system consisted of a duct and a film and couples sidebranchresonance and membrane resonance. It has 3.7 times wider frequency band with high soundabsorption coefficient than membrane resonance or side-branch only sound absorbers. 收起