连接子结构法及其在沸腾冷却床动力分析中的应用

采用连接子结构法计算120T/H沸腾冷却床结构的动力学特性,将整结构分成3个子结构,中间连接件部分取作连接子结构,利用位移及力的双协调条件,综合得到了整体结构动力学方程,求得了其前5阶固有频率及振型,并与ANSYS程序的计算结果进行了比较,二者吻合良好.为了验证计算模型及计算方法的合理性及可靠性,设计了冷却床实验模型,并对实验模型进行了理论计算,通过对比实验结果及理论计算结果,证实理论计算模型及方法合理可靠.与ANSYS方法相比,所提出的连接子结构法大大降低了系统自由度,提高了计算效率.通过对沸腾冷却床的振型分析,找出了设计中存在的缺陷,从而可为产品改进设计提供理论依据.

Mode Synthetic Method of Connecting Substructure with Applications to Dynamic Analysis of Boiling-Cooling Lathe

The dynamic characteristics of 120T/H boiling-cooling lathe were investigated by mode synthetic method of connecting substructure(MSMCS), where the system was divided into three substructures and the joint part was regarded as connecting substructure. Considering the harmonization of force and displacement, the whole system dynamic equations were obtained, the lowest five orders of natural frequencies and modes were calculated. To verify the validity of the mechanical model and MSMCS, a test model of 120T/H lathe was designed and the testing modes were measured. The modes of the test model were calculated via MSMCS and ANSYS comparatively. The results indicate that the mechanical model of the 120T/H lathe is reasonable, MSMCS is suitable to the research, and the number of the system's degree of freedom is decreased remarkably, which provides a theoretical basis for lathe design.