模态综合的多级子结构分析——两种改进装配法

当今国内外流行的模态综合法都属于“单级综合法”。它对大型复杂结构动力分析的应用仍将受到计算机容量的较大限制。本文在子结构装配方面提出的“多级综合法”与“逐步综合法”可以克服这一障碍,并能提高计算效率。另外,本文采用的“刚性子结构技术”能使模态综合法保持其功能与特点,具有重要的实用价值。文中算例表明,只要采用本文频率判据,两种改进装配法的精度是可靠的。

MULTI-LEVEL SUBSTRUCTURAL ANALYSIS IN MODAL SYNTHESIS--TWO IMPROVED SUBSTRUCTURAL ASSEMBLING TECHNIQUES

Most of the prevalent modal synthesis methods are referred to as "single-level synthesis". Their application to dynamic analysis of large complex structures may be confined by computer capacity. Two" improved substructural assembling techniques, called"multi-level synthesis"and "successive synthesis , are presented in order to raise computation efficiency and to be available for calculation of large structures on a computer with small interior capacity. In principle, the multi-level synthesis method is extension of the single-level one, but the successive synthesis only involves two substructures in each step of synthesis, one of which is synthesized in its generalized form of motion equation, and another in its physical form. In present paper the "rigid substructure technique" is also employed.A typical example has been calculated with satisfactory results. Numerical calculations show that the accuracies of the two improved assembling methods are trustworthy provided the frequency criterion proposed in this paper is adopted.