摘要
对汽轮机用射水抽气器动特性进行了有限元分析计算,得到了抽气器的前6阶固有频率及振型,以及各阶振型下的变形方式。分析表明,射水抽气器的前6阶固有频率远低于水泵等激振源的激振频率,这有利于抽气器在工作时将振动维持在一个较小的范围内;射水抽气器前6阶振型的变形方向各不相同,随着阶数的增大,其振型变形情况愈加复杂。
This paper investigates the dynamic characteristics of a water jet air ejector by FEM and obtains the first six natural frequencies ~ vibration modes of the air ejector. The model of the air ejector is set up by Solid Edge and then imported to ANSYS for a further processing. The modal analysis is carried out by the method of Block Lanczos. The calculated results show that the natural frequencies of the air ejector are much lower than the vibration exeiters＇ frequencies. This is benefit to keeping the vibration amplitudes at a low level. In addition, as the number of order increases, the deformation condition of vibration mode will be more complex. The study presented in this paper offers a sample reference for the dynamic character analysis on the air ejector.
出处
《机械工程与自动化》
2013年第1期62-63,66,共3页
Mechanical Engineering & Automation
关键词
射水抽气器
有限元
模态分析
固有频率
振型
water jet air ejector
finite element
modal analysis
natural frequency
vibration mode
