Abstract
It is seen that blisk will be in a nodal diameter vibration state under the engine order excitation, which can be simulated by traveling wave excitation. The nodal diameters rotate on the blisk and it is necessary to identify the specific form of the nodal diameter vibration. Here, based on the determination of nodal diameter vibration parameters, a novel identification method of the nodal diameter vibration was proposed through the experimental test. Specifically, a traveling wave excitation system was built using the LabVIEW control software and noncontact magnetic exciters. Based on the description of resonant state of blisk, the identification principle formulas of the nodal diameter vibration were derived and the identification procedure was given. Taking uncoated and coated blisks as the research objects, the identification method was demonstrated. The identification results showed that the shape, direction, speed, and period of nodal diameter vibration were successfully obtained by the proposed method. In addition, it was found that coatings have a damping effect on blisk. Because of the coating introduction, the blisk vibration response was reduced, the rotation speed of nodal diameter was slowed down, and the rotation period of nodal diameter was increased.
Highlights
Blisk is a new structure of modern aero engine
The parameters of impact testing is determined based on the results of finite element analysis (FEA)
The nodal diameter transformation period T and the nodal diameter vibration speed xm are related to time-domain signal period T0 of the measuring point and traveling wave excitation order C
Summary
Blisk is a new structure of modern aero engine. Compared to the traditional structure, blisk can improve the aero engine performance, simplify the rotor structure, and increase the aero engine reliability. A traveling wave excitation system was established and a novel identification method of the nodal diameter vibration for blisk was presented. If resonant responses of enough measuring points are tested, the nodal diameter shape corresponding to a certain order of blisk can be obtained. From equation (12), because of the phase differences between the exciting forces of different blade, the vibration forms of measuring points on adjacent blades are different at a certain time and the nodal diameter phenomenon occurs. It can be seen that by testing the resonant response of blisk under different phase excitations, the nodal diameter vibration of blisk can be identified clearly
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of Low Frequency Noise, Vibration and Active Control
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
