摘要
为降低原油储罐的振动效应,防止其结构的局部破坏,对立式圆柱薄壳容器的振动特性进行研究。通过ANSYS Workbench软件对薄壁储罐分别进行空罐、半罐和满罐3种状态的不同约束方式的模态分析。分析结果表明:储罐的各阶振型与固有频率的大小有关;振型的变化则与激励方向密切相关,不同方向的激励所导致的振型差异较大;在满罐状态下的固有频率值最小,在低频的激励载荷下容易发生振动,但危害较小;摆振是造成罐顶破坏的重要原因,可通过在顶端增加约束的方法来削弱摆振以提高结构的稳定性。
To reduce vibration effects of crude oil storage tank so that the local damage of its structure can be avoided, the vibration characteristics of vertical cylindrical shell containers are studied. On the ANSYS Workbench, we carried out the modal analysis for three sorts of thin-walled tanks. Some tanks are empty, and some tanks are filled with half tank of oil and the others are fulh The results show that vibration type is associated with the tank natural frequency, and the vibration mode change is closely related to the exci- tation direction, and the difference of vibration modes from different direction excitation are distinct. Natural frequency of tank is mini- mum when the tank is full. Vibration occurs easily at low frequency but less harmful. Shimmy is an important cause of roof damage, and adding constraints at the top can reduce the shimmy to improve the stability of the structure.
出处
《西华大学学报（自然科学版）》
CAS
2016年第1期24-28,共5页
Journal of Xihua University:Natural Science Edition
基金
国家质检公益项目(201210026
201310152)
甘肃省高等学校基本科研业务费(1205ZTC067)
关键词
预应力
薄壳
垂荡振动
模态
振型
满罐
约束
prestressing
thin cylindrical shell
heave vibration
modal
vibration modes
full tank
constraint
