Analysis and optimization of the dynamic response of a rectangularplate to a shock load acting on its support contour, with application toportable electronic packages

摘要

The authorse examine the dynamic response of an element having ashape of a rectangular plate (e.g. liquid crystal display) and packagedin a “double box” system (e.g. a “chassis” and a“cabinet”). The analysis is carried out, assuming that theouter box (“cabinet”) does not rebound. The purpose of theanalysis is to evaluate the effect of the masses (weights) of theelement itself and the inner box (“chassis”), as well as theeffect of the spring constants of the cushionings, on the maximumdisplacement and the maximum acceleration of the plate's supportcontour. On the basis of the performed analysis, they developedengineering guidelines for the preliminary selection of the springconstants of the cushionings, so that not to compromise the dynamicstability of the package (e.g. to keep the induced displacements andaccelerations at a sufficiently low level). They show that thisstability can be ensured by designing the package in such a way that thelower natural frequency of vibrations of the two-degree-of-freedomdynamic system in question (plate/chassis assembly) differs considerablyfrom its higher frequency