FBG strain signal collection and its fault feature analysis for ring gear crack of planetary transmission in wind turbine

In order to study the force and life of the key components in the gearbox of an existing double-rotor wind turbine, the design and structural parameters of the gearbox in the traditional National Renewable Energy Laboratory (NREL) 5 MW single-rotor wind turbine are adopted, and the fixed ring gear of the first planetary stage transmission is released to form a differential gearbox suitable for a double-rotor wind turbine with two inputs. The double input is used to connect the double rotor. Subsequently, the characteristics of the gearbox in a double-rotor wind turbine are discussed. On the basis of the constant rated power of the whole wind turbine, the total power is divided into two parts, which are allocated to the double rotors, then two rotational speeds of the two inputs are given according to different power ratios by complying with the matching principle of force and moment. Furthermore, the force acting on the pitch circle of the planet gear, as well as the force and life of the planet bearing of the two-stage planetary transmission are calculated and compared with a single-rotor wind turbine. The results show that the structural advantages of a double-rotor wind turbine can reduce the stress of key components of the gearbox and increase the life span of the planet bearing, thereby the life of the whole gearbox is improved and the downtime of the whole wind turbine is reduced.

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Vibration characteristics of two-stage planetary transmission system with thin-walled ring gear on elastic supports

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/339/1/012010 ◽

2018 ◽

Vol 339 ◽

pp. 012010

Author(s):

JianYing Li ◽

QingChun Hu ◽

ChangFu Zong ◽

TianJun Zhu ◽

ZeXing Zhang

Keyword(s):

Transmission System ◽

Vibration Characteristics ◽

Ring Gear ◽

Two Stage ◽

Elastic Supports ◽

Thin Walled ◽

Planetary Transmission

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Dynamic modeling and feature analysis of wind turbine with variable ratio gearbox

Proceedings of the 33rd Chinese Control Conference ◽

10.1109/chicc.2014.6896174 ◽

2014 ◽

Author(s):

Song Yongduan ◽

Wang Rui ◽

Cai Wenchuan

Keyword(s):

Wind Turbine ◽

Dynamic Modeling ◽

Feature Analysis ◽

Variable Ratio

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Tooth faults detection of planetary gearboxes based on tooth root strain signal of ring gear

Measurement ◽

10.1016/j.measurement.2020.108685 ◽

2021 ◽

Vol 170 ◽

pp. 108685

Author(s):

Xiaodong Zhang ◽

Hang Niu ◽

Chenggang Hou ◽

Antonio Marcal ◽

Fagui Di

Keyword(s):

Tooth Root ◽

Ring Gear ◽

Strain Signal

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Fault feature analysis of planetary gear system with tooth root crack and flexible ring gear rim

Engineering Failure Analysis ◽

10.1016/j.engfailanal.2014.12.014 ◽

2015 ◽

Vol 49 ◽

pp. 92-103 ◽

Cited By ~ 31

Author(s):

Zaigang Chen ◽

Zhifang Zhu ◽

Yimin Shao

Keyword(s):

Planetary Gear ◽

Gear System ◽

Feature Analysis ◽

Tooth Root ◽

Ring Gear ◽

Planetary Gear System ◽

Root Crack ◽

Flexible Ring

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Investigation of Energy Absorbed from an Instrumented Charpy Impact on Automotive Specimens

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.165.182 ◽

2012 ◽

Vol 165 ◽

pp. 182-186 ◽

Cited By ~ 2

Author(s):

M. B. Ali ◽

S. Abdullah ◽

Mohd Zaki Nuawi ◽

Ahmad Kamal Ariffin

Keyword(s):

Strain Energy ◽

Charpy Impact ◽

Strain Gauges ◽

Absorbed Energy ◽

Signal Pattern ◽

Signal Collection ◽

Spectrum Density ◽

The Time Domain ◽

The Impact ◽

Strain Signal

This paper presents the analysis of energy absorbed that produced from an instrumented charpy impact in order to evaluate the toughness of materials. Alloy rims made from aluminium 6061-T6 are easily damage, fracture and can even destroy after impact loading compared to the steel rim. For this reason, an idea was initiated to determine the strain signal pattern and strain energy for evaluting the toughness of materials. Strain gauges were experimentally connected to the data acquisition system and it was then attached to the charpy striker for the impact signal collection. Specimens of aluminium alloy of 6061-T6 and carbon steel 1050 were used and its were designed according to the ASTM E23 standard. In this work, the signal was converted from the time domain to the frequency domain using the power spectrum density (PSD) method and the area under its graph was then used to calculate strain energy. The comparison between absorbed energy and strain energy was performed based on different materials and thicknesses. It was found the effect of the strain signal pattern with different materials and thicknesses to be influnced the strain energy.

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Structural Response of a Commercial Wind Turbine to Various Stopping Events

Wind Engineering ◽

10.1260/0309-524x.36.5.553 ◽

2012 ◽

Vol 36 (5) ◽

pp. 553-569 ◽

Cited By ~ 6

Author(s):

Jeffrey Bas ◽

Jamie Smith ◽

Rupp Carriveau ◽

Shaohong Cheng ◽

David S-K Ting ◽

...

Keyword(s):

Wind Turbine ◽

Structural Response ◽

Wind Farms ◽

Signal Frequency ◽

Discrete Wavelet ◽

Transverse Strain ◽

Frequency Content ◽

Horizontal Axis Wind Turbine ◽

Response Characteristics ◽

Strain Signal

Increases in forced curtailments at commercial wind farms have triggered a need to investigate turbine behaviour during stopping events. A 2.3 MW commercial horizontal axis wind turbine instrumented with a fiber Bragg grating strain array was subjected to the three most common types of stopping sequences performed by the turbine to measure the supporting tower's structural response. An overview of each considered stop type is included identifying their individual mechanical processes as well as their specific triggers. The along-wind and transverse strain measurements at varying elevations of the tower are presented and discussed. Distinguishable response characteristics for each stop type are identified at stop initiation, during rotor deceleration, and following event completion. Results obtained are subsequently compared to the tower strain reactions as a result of typical power production as well as pure yawing of the nacelle. Furthermore, the strain signal has been subjected to a discrete wavelet transform identifying variations in the signal frequency content, triggered by the stopping events.

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Characteristics analysis of the new flexible ring gear for helicopter reducer

Proceedings of the Institution of Mechanical Engineers Part K Journal of Multi-body Dynamics ◽

10.1177/14644193211005976 ◽

2021 ◽

pp. 146441932110059

Author(s):

Shengyang Hu ◽

Zongde Fang ◽

Yingqiang Xu ◽

Yabin Guan ◽

Rui Shen

Keyword(s):

Element Model ◽

Test Method ◽

Tooth Surface ◽

Load Factor ◽

Ring Gear ◽

Advantages And Disadvantages ◽

The Difference ◽

Meshing Characteristics ◽

Planetary Transmission ◽

Flexible Ring

As a key component of the vibration generation and transmission of planetary transmission system, the design of ring gear will directly affect the vibration of the system. After considering the advantages and disadvantages of the traditional ring gear structure, the new flexible ring gear was designed by scholars and applied to helicopter reducer. There is a dearth of reported analysis in the meshing characteristics of the new flexible ring gear, which leads to the blind selection of the ring gear. By building an accurate parametric finite element model, the meshing characteristics of the new flexible ring gear and the difference in dynamic characteristics between the new flexible ring gear and the traditional ring gear are obtained. The analysis shows that the new ring gear is superior to the traditional ring gear in many aspects, but it also has the characteristic of unbalance loading on the tooth surface. In addition, a test method is proposed to accurately measure the load sharing coefficient and dynamic load factor of planetary transmission and the simulation results of flexible ring gear are verified by comparison.

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