HIGH FREQUENCY PERFORMANCE OF VISCOELASTIC PACKAGING MATERIALS.

The occurrence of high frequency vibrations in the response of a store, nominally cushioned against impact shock or continuous vibration, is well known, but it is usually treated as an undesirable effect to be filtered out and not investigated. An experimental program concentrating on possible means of hf generation in bulk resilient materials has been in progress for several years and some early results were reported in July 1973, in a paper at SEECO '73. This present paper adds further qualitative and quantitative results, with observations that confirm some of the earlier predictions of the way that a packaged store responds inside its outer container.