Toothwise health monitoring of planetary gearbox under time-varying speed condition based on rotating encoder signal

2021 ◽  
pp. 1-1
Author(s):  
Kaixuan Liang ◽  
Ming Zhao ◽  
Jing Lin ◽  
Jinyang Jiao ◽  
Chuancang Ding
Keyword(s):  
Health Monitoring ◽  
Time Varying ◽  
Planetary Gearbox ◽  
Speed Condition

scholarly journals Preliminary Evaluation of the Influence of Surface and Tooth Root Damage on the Stress and Strain State of a Planetary Gearbox: An Innovative Hybrid Numerical–Analytical Approach for Further Development of Structural Health Monitoring Models

Computation ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 38
Author(s):  
Franco Concli ◽  
Athanasios Kolios
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Analytical Approach ◽  
Surface Defects ◽  
Local Stress ◽  
Computational Effort ◽  
Preliminary Evaluation ◽  
Tooth Root ◽  
Planetary Gearbox ◽  
Structural Health

Wind turbine gearboxes are known to be among the weakest components in the system and the possibility to study and understand the behavior of geared transmissions when subject to several types of faults might be useful to plan maintenance and eventually reduce the costs by preventing further damage. The aim of this work is to develop a high-fidelity numerical model of a single-stage planetary gearbox selected as representative and to evaluate its behavior in the presence of surface fatigue and tooth-root bending damage, i.e., pits and cracks. The planetary gearbox is almost entirely modelled, including shafts, gears as well as bearings with all the rolling elements. Stresses and strains in the most critical areas are analyzed to better evaluate if the presence of such damage can be somehow detected using strain gauges and where to place them to maximize the sensitivity of the measures to the damage. Several simulations with different levels, types and positions of the damage were performed to better understand the mutual relations between the damaged and the stress state. The ability to introduce the effect of the damage in the model of a gearbox represents the first indispensable step of a Structural Health Monitoring (SHM) strategy. The numerical activity was performed taking advantage of an innovative hybrid numerical–analytical approach that ensures a significant reduction of the computational effort. The developed model shows good sensitivity to the presence, type and position of the defects. For the studied configuration, the numerical results show clearly show a relation between the averaged rim stress and the presence of root cracks. Moreover, the presence of surface defects seems to produce local stress peaks (when the defects pass through the contact) in the instantaneous rim stress.

scholarly journals An Improved Rigid Multibody Model for the Dynamic Analysis of the Planetary Gearbox in a Wind Turbine

2016 ◽  
Vol 2016 ◽  
pp. 1-18 ◽  
Author(s):  
Wenguang Yang ◽  
Dongxiang Jiang
Keyword(s):  
Dynamic Analysis ◽  
Transient Analysis ◽  
Planetary Gear ◽  
Time Varying ◽  
Mesh Stiffness ◽  
Vibration Signals ◽  
Planetary Gearbox ◽  
Multibody Model ◽  
Improved Model ◽  
Rigid Multibody

This paper proposes an improved rigid multibody model for the dynamic analysis of the planetary gearbox in a wind turbine. The improvements mainly include choosing the inertia frame as the reference frame of the carrier, the ring, and the sun and adding a new degree of freedom for each planet. An element assembly method is introduced to build the model, and a time-varying mesh stiffness model is presented. A planetary gear study case is employed to verify the validity of the improved model. Comparisons between the improvement model and the traditional model show that the natural characteristics are very close; the improved model can obtain the right equivalent moment of inertia of the planetary gear in the transient simulation, and all the rotation speeds satisfy the transmission relationships well; harmonic resonance and resonance modulation phenomena can be found in their vibration signals. The improved model is applied in a multistage gearbox dynamics analysis to reveal the prospects of the model. Modal analysis and transient analysis with and without time-varying mesh stiffness considered are conducted. The rotation speeds from the transient analysis are consistent with the theory, and resonance modulation can be found in the vibration signals.

Model Based SHM - Rotating Machinery Application

2005 ◽  
Vol 293-294 ◽  
pp. 459-466
Author(s):  
Tadeusz Uhl ◽  
Tomasz Barszcz ◽  
Jarosław Bednarz
Keyword(s):  
Health Monitoring ◽  
Diagnostic Method ◽  
Model Identification ◽  
Rotating Machinery ◽  
Time Varying ◽  
Theoretical Formulation ◽  
Model Based ◽  
Active Experiment ◽  
Modal Model ◽  
Identification Techniques

The paper presents application of the model based diagnostic method for early detection of faults in rotating machinery. The applicability of modal model identification techniques for structural health monitoring of rotating machinery for linear and nonlinear cases is presented. The method based on both operational and experimental (with specially designed active experiment) is discussed. The approach including mapping of nonlinear system to time varying linear one is employed. The theoretical formulation of the method and experimental verification on laboratory rig is shown.

scholarly journals Establishment and analysis of nonlinear frequency response model of planetary gear transmission system

2021 ◽  
Vol 12 (2) ◽  
pp. 1093-1104
Author(s):  
Hao Dong ◽  
Yue Bi ◽  
Zhen-Bin Liu ◽  
Xiao-Long Zhao
Keyword(s):  
Planetary Gear ◽  
Nonlinear Frequency ◽  
Time Varying ◽  
Vibration Displacement ◽  
Nonlinear Characteristics ◽  
Planetary Gearbox ◽  
Meshing Stiffness ◽  
Gear Transmission System ◽  
Nonlinear Frequency Response ◽  
Simulation Results

Abstract. Based on the lumped parameter theory, a nonlinear bending torsion coupling dynamic model of planetary gear transmission system was established by considering the backlash, support clearance, time-varying meshing stiffness, meshing damping, transmission error and external periodic excitation. The model was solved by the Runge–Kutta method, the dynamic response was analyzed by a time domain diagram and phase diagram, and the nonlinear vibration characteristics were studied by the response curve of the speed vibration displacement. The vibration test of the planetary gearbox was carried out to verify the correctness of frequency domain response characteristics. The results show that the vibration response in the planetary gear system changes from a multiple periodic response to a single periodic response with the increase in input speed. Under the action of the backlash, time-varying meshing stiffness and meshing damping, the speed vibration displacement response curves of internal and external meshing pairs appear to form a nonlinear jump phenomenon and have a unilateral impact area, and the system presents nonlinear characteristics. The nonlinear vibration of the system can be effectively suppressed by decreasing the mesh stiffness or increasing the mesh resistance, while the vibration response displacement of the system increases by increasing the external exciting force, and the nonlinear characteristics of the system remain basically unchanged. The backlash is the main factor affecting the nonlinear frequency response of the system, but it can restrain the resonance of the system in a certain range. The spectrum characteristics of the vibration displacement signal of the planetary gearbox at different speeds are similar to the simulation results, which proves the validity of the simulation analysis model and the simulation results. It can provide a theoretical basis for the system vibration and noise reduction and a dynamic structural stability design optimization.

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