Coupling fault transfer characteristics of fixed-axis gear crack and planetary gear missing tooth

To identify the fault frequency characteristics of the gear transmission system under coupling fault of fixed-axis gear crack and planetary gear wear, dimensionless dynamical equations of gear transmission system were established. Bifurcations in normal condition and coupling fault condition were contrasted. The affected excitation frequency range was found. Fault frequency characteristics in sensitive interval caused by the coupling fault of fixed-axis gear crack and planetary gear wear were analyzed. Simulation analysis shows that the crack fault in fixed-axis gear brings up peaks in doubling of 1~10 for fault frequency, the wear fault in planetary gear increases the amplitude of meshing frequency and its double and triple, and the coupling of both shows two kinds of fault features around the planetary gear meshing frequency.

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Dynamic modeling of a planetary gear system with sun gear crack under gravity and carrier-ring clearance

Procedia Manufacturing ◽

10.1016/j.promfg.2020.06.011 ◽

2020 ◽

Vol 49 ◽

pp. 55-60 ◽

Cited By ~ 1

Author(s):

Xianhua Chen ◽

Yuejian Chen ◽

Ming J. Zuo

Keyword(s):

Dynamic Modeling ◽

Planetary Gear ◽

Gear System ◽

Planetary Gear System ◽

Gear Crack

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The Research on General Modeling Methods of the Complicated Transmission Based on Hypergraph Theory

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.86.704 ◽

2011 ◽

Vol 86 ◽

pp. 704-708 ◽

Cited By ~ 1

Author(s):

Chang Le Xiang ◽

Ying Ying Zhang ◽

Hui Liu ◽

Meng Cui

Keyword(s):

Planetary Gear ◽

Automatic Generation ◽

Gear Transmission ◽

Dynamics Model ◽

Modeling Methods ◽

General Dynamics ◽

Fixed Axis ◽

Hypergraph Theory ◽

Complex Transmission ◽

Conversion Rules

In order to be adapt to the increasingly large complex transmission modeling, this paper propose methods of building generalized modeling through applying hypergraph theory to the complex fixed axis transmission, the planetary gear transmission and the integrated transmission. The author established conversion rules between the real transmission to hypergraph, and found feasibility algorithm for relay route auto search. Hypergraph theory can be further used to realize automatic generation of general dynamics model.

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Helicopter Planetary Gear Crack Fault Identification Utilizing Multidomain Stacked Contractive Autoencoders Based Deep Learning Framework

10.1109/phm-nanjing52125.2021.9612977 ◽

2021 ◽

Author(s):

Canfei Sun ◽

Yuefeng Liu ◽

Linran Huang

Keyword(s):

Deep Learning ◽

Planetary Gear ◽

Fault Identification ◽

Learning Framework ◽

Gear Crack

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Inherent Characteristic Analysis for Torsional Vibration of a Planetary Transmission

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.660.75 ◽

2013 ◽

Vol 660 ◽

pp. 75-79

Author(s):

Yang Yang ◽

Yan Xiao Fu ◽

Liang Yi Cui ◽

Xiang Yang Xu

Keyword(s):

Torsional Vibration ◽

Lagrange Equation ◽

Planetary Gear ◽

Characteristic Analysis ◽

Distribution Method ◽

Multi Stage ◽

Vibration Model ◽

Power Split ◽

Fixed Axis ◽

Planetary Transmission

A torsional vibration mechanical model of the transmission system of a certain cetarpillar vehicle is established using mass distribution method. The torsional vibration model, containing multi-stage simple and compound planetary gear transmissions, fixed-axis transmission and power split/converge system, is established based on Lagrange Equation. Matlab is used for presenting and writing the according program of the modal analysis of free torsional vibration. The study is focused on the torsional vibration characteristic of the system on one specific working condition and the similarity in the inherent characteristics of the system on different working conditions.

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Nonlinear Dynamic Characteristics of Fixed-Axis Gear Wear in Multistage Gear Transmission Systems

Shock and Vibration ◽

10.1155/2019/5641617 ◽

2019 ◽

Vol 2019 ◽

pp. 1-11

Author(s):

Xin Wang

Keyword(s):

Planetary Gear ◽

Transition Process ◽

Transmission System ◽

Gear Transmission ◽

Gear Teeth ◽

Gear Transmission System ◽

Diagnosis Method ◽

Fixed Axis ◽

Spectrum Characteristics ◽

The Stability

With the increasing service life of a gear transmission system, the gear teeth become constantly worn and the gear clearance increases. The increase in the clearance will produce a series of nonlinear changes that change the stability of the system and can even cause the loss of stability. In this paper, dimensionless dynamic equations of a multistage gear transmission system that contains a two-stage fixed-axis gear and a one-stage planetary gear were derived. The wear fault was simulated by changes in the gear clearance. System bifurcation diagrams with an increase in the clearance were studied. The motion state and transition process of the multistage gear transmission system with a wear fault were studied using the Poincaré section. The change in the spectrum characteristics with an increase in the clearance was analyzed. The frequency spectrum characteristics of the wear fault were discovered. The vibration mechanism and a fault wear diagnosis method in a multistage gear transmission system were obtained.

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Helicopter main reduction planetary gear fault diagnosis method based on SVDD

International Journal of Applied Electromagnetics and Mechanics ◽

10.3233/jae-209316 ◽

2020 ◽

Vol 64 (1-4) ◽

pp. 137-145

Author(s):

Yubin Xia ◽

Dakai Liang ◽

Guo Zheng ◽

Jingling Wang ◽

Jie Zeng

Keyword(s):

Fault Diagnosis ◽

Planetary Gear ◽

Gaussian Kernel ◽

Support Vector ◽

Support Vector Data Description ◽

Vector Data ◽

Energy Characteristics ◽

Gear Fault ◽

Channel Information ◽

Diagnosis Method

Aiming at the irregularity of the fault characteristics of the helicopter main reducer planetary gear, a fault diagnosis method based on support vector data description (SVDD) is proposed. The working condition of the helicopter is complex and changeable, and the fault characteristics of the planetary gear also show irregularity with the change of working conditions. It is impossible to diagnose the fault by the regularity of a single fault feature; so a method of SVDD based on Gaussian kernel function is used. By connecting the energy characteristics and fault characteristics of the helicopter main reducer running state signal and performing vector quantization, the planetary gear of the helicopter main reducer is characterized, and simultaneously couple the multi-channel information, which can accurately characterize the operational state of the planetary gear’s state.

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