Abstract
In this paper, reactive shearing structural intensity method is extended to damping patches placement on outer panels of outdoor unit of air-conditioner to reduce its structural borne noise. After the structural intensity is calculated for simple structures such as plate, corrugated plate and outdoor unit panel, damping patches are placed over areas of high reactive shearing structural intensity. The structural intensity is calculated from the normal velocities of each panel of an outdoor unit that is measured by using a laser scanning vibrometer, and k-space signal processing is used to obtain the spatial derivatives in formulation of structural intensity. Then this method is also applied to the outdoor unit of air-conditioner during operating mode. Finally, experimental results show the largest reduction of sound pressure level of an outdoor unit by applying small damping patches to optimized position.
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