EXPERIMENTAL AND NUMERICAL COMPARISON OF VISCOELASTIC MATERIAL DAMPINGTO EQUIVALENT MASS AS ACOUSTIC TREATMENT TO AIRCRAFT COMPOSITE FUSELAGESTRUCTURE UNDER VARIOUS EXCITATIONS

摘要

Passive noise control treatments are used widespread in aircraft industry. A typical passive aircraft noise treatment (or sound package) is made up of a combination of viscoelastic damping and low density porous materials. A sound package is used to minimize the direct transmittance of sound waves (airborne) and radiation of noise (structure borne) into aircraft cabin interior.