Phương pháp nhận dạng hư hỏng bộ truyền bánh răng trong điều kiện vận hành với tốc độ quay biến đổi

NGHIEN ClifU - TRAO 061

PHU'aNG PHAP NHAN DANG HU* HONG BO TRUYEN BANH RANG

TRONG DIEU KIEN VAN HANH Vd | TOC DO QUAY BIEN DOI

BANG PHEP BIEN DOI NEN WAVELET SUY RONG

FAULT IDENTIFICATION METHOD IN GEARBOXES OPERATING

AT VARIABLE ROTATION SPEEDS USING THE GENERALIZED

SYNCHROSQUEEZING TRANSFORM

ThS. Nguyen Trong Du

Khoa Cdng nghe Co khi, Trudng Dai hgc Dien lire

T6M TAT

Phdn tich tin hiiu trong mien th&i gian - tdn so (Time-Frequency Analysis - TFA) la mpt

cong cu hihi hiiu di phdt hiin hu hong trong he truyen dpng co toe dp quay biin doi. Trong bdi

bdo ndy tdc gid de cgp t&i mpt phucmg phdp phdn tich tin hieu trong miin thai gian - tdn s6 m&i

tren ca s&phep biin doi nen Wavelet suy rpng (Generalized Synchrosqueezing Transform - GST).

V&i phuang phdp ndy tin hiiu dao dpng do dugc. se dugc xu ly bdng GST, co khd ndng nhdn dang

tot tdn so dn kh&p vd cdc ddi bien. Phuong phdp ndy dugc tdc gid kiem chicng bdng tin hiiu dao

dpng mo phong vd tin hiiu dao dpng thifc do tren mo hinh thi nghiem. Kit qud phdn tich chi ra

rdng day Id mpt phuang phdp co hieu qud trong viec gidm sdt tinh trgng hogt dpng cua bo truyin

banh rang van hdnh trong dieu kien toe dp quay biin doi.

Tur khoa: Phep bien doi Wavelet, phep biin doi nen Wavelet, phep bien doi nen Wavelet

suy rpng, hu hong hdnh rdng, phdn tich thai gian - tdn so.

ABSTRACT

Time-Frequency Analysis (TFA) Is an effective tool to detect gearbox faults at variable

operating speeds. The present study deals with an advanced method of TFA based on Continuous

Wavelet Transform (CWT), called generalized synchrosqueezing transfrom (GST). Using this

method, the measured vibration signal is transformed into time-frequency domain to obtain its

Time-Frequency Distribution (TFD) having high resolution in time and frequency domain. The

gearbox fault, if any, can then be detected by observing the presence of the meshing frequency

and side band components in the TFD. The TFA-approach used is evaluated using both simulated

and measured vibration signals at a test-rig. The results have shown that this approach is effective

for gearbox condition monitoring.

Keywords: Wavelet transform, synchrosqueezing transform, generalized synchrosqueezing

transform, gear fault, time-frequency analysis. ^

ISSN 0866 - 7056

TAP CHi CO KHi VIET NAM, Sd 1+2 nam 2015

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