Vibration-modelling-based fault feature analysis for incipient damage identification of sun gear

Abstract

Different types of incipient damage to gears need to be distinguished for the reliable and safe operation of mechanical equipment. However, the identification of various types of incipient gear damage is still a challenge for the fault diagnosis of planetary gearboxes. To identify the various types of incipient damage in a sun gear, fault feature analysis is conducted for various damage conditions in a planetary gearbox. First, the internal excitation aroused by gear damage is computed and the effects of the typical damage modes of a sun gear on the internal excitation are demonstrated. Then, the internal excitation of the damaged sun gear is applied into the dynamic model of the planetary gear train to simulate distributed damage or local damage. After that, with the vibration responses obtained from the dynamic model, a vibration signal model is proposed to simulate the vibration signals of the planetary gearbox. Furthermore, the vibration signals are analysed over the time domain and frequency domain. The fault features of the planetary gearbox are characterized by using residual signals and variational mode decomposition signals, which are useful for identifying the various incipient damage types of a sun gear. Finally, the simulated results are validated by experimental tests.

Quantitative assessment for tooth crack of the sun gear in a planetary gearbox

“…Therefore, the modulation effect aroused by the rotation of the carrier must be considered into the vibration signal. Herein, the modified Hamming function H m (t) is used to describe the effect of carrier rotation [31] Hm (t) = e ξ ( mod (ωct+φ pn,2π )−π ) 2 (0.54 − 0.46 cos (ωct + φ pn)) (11) where ξ is the modification coefficient. In summary, the vibration signal model of a planetary gearbox can be expressed as…”

Research on the calculation and evaluation method of transmission efficiency of noncircular planetary gear

“…Therefore, the analysis and measurement of dynamic torque are of great significance for the dynamic performance analysis and research of planetary gear systems. It can provide important technical support for subsequent fault diagnosis [12][13][14][15], and measurement of gear tooth profile errors [16,17].…”

Measurement and evaluation of time-varying meshing stiffness of faulty gears under different types

“…TVMS is an important source of vibration and noise in gear transmission systems, and it is also one of the main forms of internal excitation, which varies with different parameters, which is essentially a parameter excitation. Therefore, accurate acquisition of TVMS is the key to establishing dynamic models and analyzing dynamic behavior [6]. The methods for calculating mesh stiffness, including potential energy method, finite element method, experimental method, etc, can be derived according to the principles of material mechanics and elasticity.…”