关键词: 涡轮增压器；模态分析；失谐叶片；振动局部化

Abstract: In order to solve the vibration problem caused by the detuning of the turbine blades of the turbocharger, the substructure model of the turbine blades is established, the modal analysis is carried out, the Campbell diagram is drawn, and the natural frequencies and mode shapes of the mistuned blades with different standard deviations are measured. The results show that when the blade is mistuned, it is periodically destroyed, and one or several blades vibrate abnormally, showing the phenomenon of vibration localization. Therefore, it is necessary to avoid damage to the turbine blades caused by stress concentrations and prevent the failure of the turbocharger during the design. The relationship between the random mistuning of blades and the resonance characteristics of blisk structure is the key to study the vibration characteristics of blades, and this link can ensure stable operation and improve performance, it is of great significance for the study of blade mistuning.

Key words: Turbochargers; Modal analysis; Mistuned blades; Vibration localization