摘要
建立了支承局部共振动力学模型,给出了利用振动数据进行局部共振频率预测的方法。进行了转子动力学试验,试验转子含有2个盘和2个支承并固定到柔性摆架上,试验中出现单个支承外传力超限,但盘的振动位移幅值较小,且有上升趋势的现象,符合支承局部共振的特征。利用局部共振频率预测方法对振动数据进行处理,得到了理论预测的局部共振频率。进行了模态试验,得出的局部共振频率与理论预测吻合,同时也验证了局部共振诊断。结合模态振型对摆架进行了改进,改进后,消除了该处局部共振。
Local resonance rotordynamic model was developed. The method of forecasting local resonance frequency was carried out using the vibration data picked from the rotor. Rotordynamic experiment was taken with the rotor which consists of two disks and two bearings supported by flexible pedestals. The outward force of one pedestal was out of range, while the vibration of the disks was small with uptrend. The phenomena accords with local resonance. The method of forecasting local resonance frequency was used to analyze the vibration data, as the result, the theoretical frequency was found. Modal test was carried out, and similar frequency to theoretical onewas got, which also prove the fault diagnosis of local resonance. The pedestals was redesigned based on the mode shape, which removes the local resonance out of the working range.
出处
《火箭推进》
CAS
2017年第3期6-9,共4页
Journal of Rocket Propulsion
基金
国家重大基础研究项目(613321)
关键词
转子特性参数
局部共振
模态试验
故障诊断
rotordynamic characteristic parameter
local resonance
modal test
fault diagnosis
