陶瓷基复合材料整体叶盘振动仿真分析

Vibration Simulation Analysis of Ceramic Matrix Composite Turbine Rotor Integral Blade-Disk

对陶瓷基复合材料整体叶盘结构振动特性仿真分析,首先对整体叶盘的叶片单独进行固有频率计算和模态分析,获得叶片的前4阶模态。其次对去除叶片的轮盘进行振动仿真分析,计算给出前4阶模态振型及对应的固有频率。最后对整体叶盘进行计算,得出整体叶盘的前8阶固有频率及其对应振型。由仿真计算结果可知:叶片对整体叶盘的振动模态有很大的影响。叶片与轮盘的耦合振动,使得叶盘形成的几个振型与轮盘本身的振型相同,但固有频率不一样的模态。

The vibration characteristics of ceramic matrix composites (CMCs) monolayers were simulated and analyzed. Firstly, the natural frequency calculation and modal analysis of the monolayers were carried out, and the first four modes of the monolayers were obtained. Secondly, the first four modes and their corresponding natural frequencies are calculated by the vibration simulation analysis of the wheel with the blades removed. Finally, the first 8 order natural frequencies and corresponding modes of the whole bladed disc are calculated. The simulation results show that the blade has a great influence on the vibration mode of the whole blade disc. The coupled vibration of the blade and the wheel causes several modes formed by the blade disc to have the same mode shapes as the wheel itself, but different natural frequencies.