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Structural dynamic analysis of turbine blade

机译：涡轮叶片的结构动力学分析

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In any gas turbine design cycle, blade design is a crucial element which needs maximum attention to meet the aerodynamic performance, structural safety margins, manufacturing feasibility, material availability etc. In present day gas turbine engines, most of the failures occur during engine development test and in-service, in rotor and stator blades due to fatigue and resonance failures. To address this issue, an extensive structural dynamic analysis is carried out to predict the natural frequencies and mode shapes using FE methods. Using the dynamics characteristics, the Campbell diagram is constructed to study the possibility of resonance at various operating speeds. In this work, the feasibility of using composite material in place of titanium alloy from the structural dynamics point of view. This is being attempted in a Low-pressure compressor where the temperatures are relatively low and fixed with the casings. The analysis will be carried out using FE method for different composite material with different lamina orientations chosen through the survey. This study will focus on the sensitivity of blade mode shapes to different laminae orientations, which will be used to alter the natural frequency and tailor the mode shapes. Campbell diagrams of existing titanium alloy are compared with the composite materials with different laminae at all critical operating conditions. The existing manufacturing methods and the proven techniques for blade profiles will also be discussed in this report.
机译：在任何燃气轮机设计周期中，叶片设计都是至关重要的要素，必须满足空气动力学性能，结构安全裕度，制造可行性，材料可用性等方面的最大关注。当今的燃气轮机发动机，大多数故障都发生在发动机开发测试期间以及由于疲劳和共振故障而在使用中的转子和定子叶片。为了解决这个问题，进行了广泛的结构动力学分析，以使用有限元方法预测固有频率和振型。利用动力学特性，构造了坎贝尔图，以研究在各种运行速度下发生共振的可能性。在这项工作中，从结构动力学的角度来看，使用复合材料代替钛合金的可行性。这是在温度相对较低并固定在壳体中的低压压缩机中尝试的。将使用有限元方法对通过调查选择的具有不同薄片取向的不同复合材料进行分析。这项研究将集中于叶片模式形状对不同薄片方向的敏感性，这将用于改变固有频率并调整模式形状。在所有关键操作条件下，将现有钛合金的坎贝尔图与具有不同薄片的复合材料进行比较。本报告还将讨论叶片轮廓的现有制造方法和行之有效的技术。

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