模态试验过程控制研究  

作　　者：姜睿[1] 王婧[1] 赵凤飞[1] 

机构地区：[1]沈阳发动机设计研究所,辽宁沈阳110015

出　　处：《科技视界》2014年第4期9-11,共3页Science & Technology Vision

摘　　要：模态试验可用于了解燃气涡轮发动机结构件固有振动特性,这对于判断该结构件是否会在发动机工作过程中出现共振并最终可能导致高循环疲劳失效是十分必要的。本文以某型燃气涡轮发动机风扇机匣组件为试验对象,通过调整模态试验过程中的一些参数的变化来说明细节控制对试验结果的影响。试验结果表明,就该试验件而言,使用钢制锤头与铝制锤头进行试验所得到的模态试验结果一致;模型周向网格点数量对频率试验结果没有影响,但对振型影响较大;对于直径与轴向长度比较小的机匣组件,采用整体建模方法进行试验不仅耗时,而且无法得到高阶振型,可通过简化模型多次试验最终对试验结果进行综合分析的方法来解决。Modal test can be used to understand the natural vibration characteristics of the gas turbine components, which should be necessary to estimate whether the component will be excited to resonance which may result in high cycle fatigue failure during the gas turbine working period. In this thesis, the fan casing of gas turbine is used as the test object, and the influence to modal test results caused by the adjusting of some parameters during the test is shown. According to the test results, there are no difference by using steel hammerhead and aluminum hammerhead, and the number of circumferential nodes will affect the mode shape results of the component but affect the natural frequency results of the component little. For the fan casing with smaller ratio of diameter to the axial length, using the whole model in modal test should not only be a waste of time but also can not achieve the exact mode shapes with higher frequencies. However, this problem can be solved by simplifying the test model, execute numbers of tests and finally analyzing all the results together.

关 键 词：风扇机匣 试验模态分析 固有模态 固有频率 振型 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]