The rapid development of modern complex mechanical power transmission systems has led to an increasing interest in the analysis of torsional vibrations for multi-branch shaft systems.

The idea that structures are divided into different layers and substructures are synthesized layer by layer is put forward for a branch shafting system.

The paper also puts forward a regulation of decomposing complex paths into some simply path and discusses the issue that ancestor-descendant relationships and sibling relationship should be considered together in the structure join.

Technology research on extrusion process of complicated pedestal part;

Static and dynamic structural analysis of spatial latticed grids with complicated supporting conditions is very difficult in the analysis of latticed grids.