Fault diagnosis method of planetary gear box based on 1.5-dimensional envelope spectrum

LIANG Hao, JIANG Zhang-lei, LI Yu-heng, XU Xiao-li
(Key Laboratory of Modern Measurement & Control Technology，Ministry of Education, Beijing Information Science and Technology University, Beijing 100192, China)

Abstract: Aiming at the complex transmission path in planetary gearbox and the coupling of multiple characteristic frequencies, the wear fault of tooth surface of planetary gear box was studied. The 1.5dimensional spectrum based on complex field can be used in the case of satisfying quadratic frequency coupling was proved by formula. A fault diagnosis method based on frequency coupling for 1.5dimensional envelope spectrum was proposed. The life cycle experiment of planetary gear case tooth surface wear was tested, the wear fault feature of planetary gearbox was extracted and the change rule of quadratic frequency coupling fault feature in the process of planetary gear case tooth surface wear was summarized. The results indicate that the 1.5-dimensional envelope spectrum of frequency components generated by coupling can extract the quadratic coupling fault feature better，and identify the planetary gear wear fault more accurately, which provides a favorable basis for the wear fault of tooth surface of planetary gearbox.
Key words: planetary gear box; fault diagnosis; 1.5-dimensional envelope spectrum; wear fault of tooth surface; fault feature