前言汽轮机在运转过程中,叶片要产生振动,一旦这种振动落入某种共振状态,就要导致叶片的疲劳破坏。在叶片设计中,由于它的型线及联接方式很复杂,用纯理论计算方法准确得到叶片的各种频率和与之相应的振型是比较困难的。以前用沙型法、或用传感元件观察位相等试验方法、往往只能得出较低价的振型,而用激光全息的方法,就能很方便的得到各阶振型。这是用其他方法所不可比拟的。用激光全息的方法研究单支叶片的振动,在一些兄弟单位已经进行了,对于我厂来 Preface Turbine in operation, the leaves to produce vibration, once the vibration falls into a state of resonance, it will lead to fatigue damage leaves. In the blade design, due to its complex shape and connection method, it is more difficult to obtain all kinds of blade frequencies and corresponding vibration modes accurately by purely theoretical calculation. In the past, the sand method, or the observation of the sensing element with the same test method, often resulted in lower vibration modes. However, the holographic vibration mode can be easily obtained for all modes. This is unmatched by other methods. Using laser holographic method to study the vibration of a single leaf, in some brothers units have been carried out for my plant to