Effect of Backing PU Foam Material Properties on Acoustic Insulation Pad Insertion Loss

<div class="section abstract"><div class="htmlview paragraph">The effect of backing polyurethane (PU) foam material properties on the insertion loss of acoustic insulation pads was investigated. First, the material properties affecting the resonant frequency, which mainly determines the insertion loss, were theoretically identified, and practical methods for calculating both the resonant frequency and the insertion loss of the insulation pad were developed. These methods were then ap