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(一)前言在作结构的振动计算时,经常要考虑选用适当的特征值问题计算方法。最近研究肋形楼盖的振动,由于结构在平面的两个方向具有多跨连续的特点,以致频谱甚为密集,只求开头少数几个振型,不足以解决动力反应问题。为此曾选用豪斯霍尔德三对角化及带原点移动的 QL 法标准程序,这是目前计算完全特征系的最有效方法。但是随着自由度数目之增加,用 QL 法的计算时间愈来愈占主要地位。用 QL 法的计算时间大致与自由度数的
(I) Preface When calculating the vibration of a structure, it is often necessary to consider the selection of an appropriate eigenvalue problem calculation method. The recent study on the vibration of ribbed floor covers, due to the multi-span continuous nature of the structure in the two directions of the plane, resulting in a very dense spectrum, only a few vibration modes at the beginning, insufficient to solve the dynamic response problem. For this reason, Haushold’s three-diagonalization and the QL method with the origin movement have been selected as standard procedures. This is the most effective method for calculating the full-featured system. However, with the increase in the number of degrees of freedom, the calculation time using the QL method has become increasingly dominant. The calculation time of QL method is roughly equal to the degree of freedom.