Strip excitation, Part I: Strip mobility

Abstract

The possibility of extending the mobility concept to incorporate cases with large excitation areas has been examined. Two alternative formulations are used, one based on the complex power transmitted and the other on the effective mobility. A suggestion for the classification of various excitation conditions associated with large excitation areas is discussed. The extension of the mobility, denoted strip mobility, is derived for thin, infinite plates subject to two different, symmetric force distributions. In addition, the effective mobilities are derived for the same force distributions. It is found that although the two force distributions are spatially different, the similarity in the corresponding strip mobilities is significant. Moreover, it is shown that for given total force a strip excitation reduces the active power input at large Helmholtz numbers.