Blade Self-excited Vibration With Identification Of Fan Using Microphone Array
ID:64 View Protection:PUBLIC Updated Time:2022-12-22 12:54:00 Hits:397 Poster Presentation

Start Time:Pending (Asia/Shanghai)

Duration:Pending

Session:[No Session] » [No Session Block]

Abstract
The identification of blade self-excited vibration on a fan is attached to great importance for aero-engine operation safety. A non-contact method based on acoustic measurement is proposed to identify blade self-excited vibration via the run-up test, where a circular microphone array is arranged in the inlet section of a three-stage fan. The test results at 6880r/min present that the asynchronous aerodynamic excitation frequency has a connection with the asynchronous blade vibration frequency. In order to reveal the connection between sound pressure fluctuations and blade vibration in asynchronous vibration phenomena, the acoustic mode decomposition are carried out. The experimental results shows that the fan blade exists asynchronous vibration when the dominant acoustic mode order decomposed at the asynchronous aerodynamic excitation frequency is the same as the nodal diameter. A brief formula is provided to reveal the connection of sound signals to identify asynchronous vibrations.
Keywords
Microphone array, Self-excited vibration, Fan, Traveling wave, Acoustic boundary
Speaker
Zhendong Li
Xi’an Jiaotong University

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Important Dates

15th August 2022 25th September 2022 - Manuscript Submission
15th October 2022 - Acceptance Notification
1st November 2022 - Camera Ready Submission
1st November 2022 10th November 2022Early Bird Registration

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