分支轴系扭振的子结构分析方法研究

针对分支轴系结构,提出了一种按齿轮啮合形式分级划分子结构并逐级综合的方法来获取整个系统的扭振固有特性,并且采用这种方法分析了650轧机主传动系统分支结构的扭振固有特性。与其他方法计算结果的比较,表明了本文子结构分级划分与逐级综合方法的可行性。这种子结构分级划分、逐级综合分析原理,扩展了子结构模态综合法在分支轴系扭振问题上的应用范围,有效求解了复杂系统问题,为解决分支轴系结构扭振问题提供了一种良好思路。

STUDY ON SUBSTRUCTURE METHOD FOR TORSIONAL VIBRATION OF A BRANCH SHAFTING SYSTEM

The idea that structures are divided into different layers and substructures are synthesized layer by layer is put forward for a branch shafting system. Then, a three-gear displacement coordination relationship is deduced from a two-gear displacement coordination relationship. Substructures are synthesized layer by layer through either the three-gear displacement coordination relationship or the two-gear displacement coordination relationship and the dynamic characteristics of the whole system is obtained at last. At the end, the dynamic characteristics of a classical branch structure and the transmission system of the 650 rolling mill driving system are calculated and they are compared with the results obtained by other methods which is so complex that it is inefficient when solving problems. The three-gear displacement coordination relationship and the idea mentioned above expand application range of the substructure method into torsional vibration of a branch shafting system, and also embody the adaptability of the substructure method in dealing with complex systems.