摘要
本文结合船舶结构振动计算的特点,把SAP-5程序的行列式搜索法加以推广,设计出能处理和判别刚体模态、能从任意谐调频率开始计算的行列式搜索法。这种算法可以根据不同谐调数选取不同附连水(集中质量),亦可以根据船舶装载情况分几种工况(几种质量分布)进行计算,这样更适合于船舶总振动、局部振动和联合振动计算。
Considering certain special characteristics in the vibration analysis of ship hull or offshore platform structure,an improved determinant search method is presented for the SAP-5 program.It is capable to identify the mode of rigid bodies and calculate the frequencies started from any arbitrary order. The following items are incorporated:the discrimination of the mode of rigid bodies,the Sturm sequence root-dividing,the secant and bisecting method used for searching the step,the shifting inverse iteration method and the Gram-Schmidt orthogonalization method. Different distributions of concentrated masses can be ch'osen in accordance with the order of eigenvalues,and the calculations of hull,local and coupled-vibration may be made for different ship loading conditions.The algorithm concept used in this paper is explained in detail and is programmed.The modifications are made to the SAP program developed by the Applied Software Development Center of CSSC.
出处
《船舶工程》
CSCD
北大核心
1990年第5期4-12,2,共9页
Ship Engineering
