摘要
耦合振动建模与分析是振动控制的基础。针对末端带有集中质量的轴与加筋壳体的耦合系统，分别利用解析法和有限元法计算轴系导纳和加筋壳体导纳，并将艉轴承与推力轴承作为子结构连接单元，通过频响函数综合进行模型合成，得到整个系统的频域描述模型。在此模型基础上，分析了系统振动固有特性及其随轴承刚度的变化规律，并讨论在轴上实施纵向振动控制的可行性。结果表明，推力轴承刚度改变轴系纵振频率，对纵振能量传递有明显影响；轴系纵向振动不仅会引起壳体纵向共振，还会引起壳体弯曲振动，形成轴-壳体纵横耦合模态；轴的纵向振动控制可以减小耦合系统振动。
Abstract
Modeling of the coupled vibration is the base for exploring vibration control. In the modeling process, frequency response functions (FRFs) of the shaft with a mass at one of its ends are calculated by the analytical method while FRFs of the reinforced hull structure are calculated by the finite element method (FEM). A frequency description model of the shaft-hull coupled system is obtained by synthesis of FRFs of the shaft and the hull structure, in which bearings are regarded as link units between substructures. In terms of the synthesized model, natural characteristics and their variation with parameters of the thrust bearing have been analyzed and feasibility of carrying out longitudinal vibration control on the shaft is discussed as well. Analysis results have shown that variation of the thrust bearing stiffness changes longitudinal vibration frequencies of the shafting system and thus has a significant influence on vibration transmission. Longitudinal vibration of the shaft causes not only longitudinal resonance in the hull structure but also lateral vibration in the shaft-hull coupled system. Furthermore, suppression of longitudinal vibration of the shaft is able to reduce vibration in the coupled system.
关键词
轴—壳体耦合系统 /
解析法 /
有限元法 /
频响函数综合
{{custom_keyword}} /
Key words
shaft-hull coupled system /
analytical method /
FEM /
FRF synthesis
{{custom_keyword}} /
李攀硕;李栋梁;张志谊.
轴—壳体系统耦合振动的建模与分析[J]. 振动与冲击, 2012, 31(5): 128-131
Li Pan-shuo;Li Dong-liang;ZHANG Zhi-yi.
Modeling and analysis of coupled vibration of a shaft-hull system[J]. Journal of Vibration and Shock, 2012, 31(5): 128-131
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
{{custom_fnGroup.title_cn}}
脚注
{{custom_fn.content}}
PDF(1215 KB)
