| 摘要 |
A method and device for experimental characterisation of vibration and acoustic properties of sound insulation materials comprises; two or more loud speakers 3a and 3b for air-borne sound excitation on one side of a specimen material 1; two or more pistons 2a and 2b for exciting the specimen on the other side via vibration from force shaker exciters 6a and 6b; two or more accelerators 5a and 5b, two or more force transducers 7a and 7b, and at least one pressure-particle velocity (PU) sensor 4 for measuring relevant data; a control unit 9 to control the shaker exciters; and a data acquisition unit 10. Alternatively, the device may comprise only one force shaker exciter [fig. 4, 6], a solid support [fig. 4, 11] and one or more flexible springs [fig. 4, 12] located between the support and piston 2b. The device measures sound pressures, normal particle velocities, accelerations and forces, and uses a mathematical method to computer a matrix which defines the excitation and response pressures/velocities of patches of the material. A calibration procedure and method for correction of an air gap between the PU sensor and the specimen. |
