Determination of the critical bending speeds of a multy-rotor shaft from the vibration signal analysis

International Conference on Applied Sciences 2017

Cratiu, I.^1 ; Nyaguly, E.^1 ; Deac, S.^1 ; Gozman-Pop, C.^1 ; Bargu, A.^1 ; Bereteu, L.^1

Politehnica University Timisoara, Department of Mechanical and Strength Materials, Mihai Viteazul str., no. 1, Timisoara

300222, Romania^1

关键词: Condenser microphone;    Critical bending;    Critical speed;    Impulse excitation technique;    Modal parameters;    Vibration response;    Vibration signal analysis;    Vibro acoustic response;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/294/1/012035/pdf
DOI  :  10.1088/1757-899X/294/1/012035

来源: IOP

【 摘 要 】

The purpose of this paper is the development and validation of an impulse excitation technique to determine flexural critical speeds of a single rotor shaft and multy-rotor shaft. The experimental measurement of the vibroacoustic response is carried out by using a condenser microphone as a transducer. By the means of Modal Analysis using Finite Element Method (FEM), the natural frequencies and shape modes of one rotor and three rotor specimens are determined. The vibration responses of the specimens, in simple supported conditions, are carried out using algorithms based on Fast Fourier Transform (FFT). To validate the results of the modal parameters estimated using Finite Element Analysis (FEA) these are compared with experimental ones.