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某型轴流式压气机性能试验过程中出现转子叶片裂纹故障.结合该型压气机结构特点,分析了振动响应的时域信号、频域信号以及高频成分出现的频率波动现象,总结了含裂纹叶片的轴流式压气机整体叶盘振动特性.分析结果显示:含裂纹叶片的整体叶盘使得轴流压气机振动响应呈现非线性特性;振动频谱中出现共振峰分离现象,表明叶片裂纹引起轴流压气机1级转子叶盘出现结构失谐;随转速升高,两个共振峰对应频率均出现波动现象(波动周期分别约为8s和9.2s),叶片裂纹不断扩展且数量增加,整体叶盘失谐程度不断加深,整体叶盘系统出现低阶模态局部化现象.
In the performance test of a certain axial-flow compressor, rotor blade cracks occur during the performance test.According to the structural characteristics of the compressor, the time-domain signals, frequency-domain signals and frequency fluctuations of the vibration response are analyzed. The results show that the integral leaf disc with cracked leaf makes the axial compressor show a nonlinear vibration response; the separation of resonance peak appears in the vibrational spectrum, which indicates that the leaf crack caused As the rotational speed increased, the corresponding frequencies of the two forks fluctuated (the fluctuation periods were about 8s and 9.2s, respectively), and the number of cracks in the blades increased and the number of the whole The degree of leaf disc detuning deepened continuously, and the whole leaf disc system appeared low-order modal localization phenomenon.