Analysing RMS and peak values of vibration signals for condition monitoring of wind turbine gearboxes

Igba, Joel; Alemzadeh, Kazem; Durugbo, Christopher; Eiriksson, Egill Thor

doi:10.1016/j.renene.2016.01.006

Cited by 122 publications

(67 citation statements)

References 32 publications

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“…In the case of analysis of current from a defective machine, effective values are higher than in the case of an undamaged device (e.g. for monitoring of induction motor [42], rotor fault [43] or wind turbine gearboxes [44]). This relationship can be transferred to the grinding process, which is carried out with grinding wheels with different wear levels.…”

Section: Acoustic Emission and Force Signalsmentioning

confidence: 99%

The estimation of machining results and efficiency of the abrasive electro-discharge grinding process of Ti6Al4V titanium alloy using the high-frequency acoustic emission and force signals

Sutowski

Święcik

2017

Int J Adv Manuf Technol

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The paper presents the results obtained for abrasive electro-discharge grinding (AEDG) of Ti6Al4V titanium alloy with the use of super hard grinding wheels of cubic boron nitride with a metal bond. The experimental investigations were focused on process monitoring for sharp and worn grinding wheels. For the evaluation of the grinding process, the grinding force amplitude and a few descriptors of the high-frequency stress waves were investigated in both time and frequency domains. The results show that during the AEDG, specific elastic waves are generated. Since these waves have characteristic amplitudes, frequencies, and other different descriptors dependent on the current grinding wheel cutting ability and discharge parameters, they can be applied to estimate a statistically significant regression function. For each measurement signal, a few statistical features are calculated and used as input for data selection and classification procedures. Registration and classification of forces and acoustic emission signals can be used to analyse the abrasive electro-discharge grinding process and allow for the determination of the machining results and the lifespan of super hard grinding wheels.

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Section: Acoustic Emission and Force Signalsmentioning

confidence: 99%

The estimation of machining results and efficiency of the abrasive electro-discharge grinding process of Ti6Al4V titanium alloy using the high-frequency acoustic emission and force signals

Sutowski

Święcik

2017

Int J Adv Manuf Technol

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“…Fig. 6 shows an example of a WT gearbox high speed bearing vibration remote monitoring via CMS done by the authors in [20,29]. Here, the relationships between the wind speed and RMS values of the vibration signals have been modelled for normal operation (see [34] for more on the modelling approach).…”

Section: Remote Monitoringmentioning

confidence: 99%

“…Measuring WT health enables the identification of potential defects and abnormal operations which in turn facilitates the proactive planning MRO activities well before failure occurs, hence reducing downtime due to unscheduled service and ensuring that performance obligations are met [20,25]. For more details on the current best practices in WT monitoring see [24,[26][27][28][29][30]. …”

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confidence: 99%

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Through-life engineering services of wind turbines

Igba

Alemzadeh

Durugbo

et al. 2017

CIRP Journal of Manufacturing Science and Technology

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IntroductionRenewable and alternative energy technologies have developed from very small scale R&D projects to commercial technologies, contributing to the global energy and power generation mix [1]. Of significance is the power generation from wind energy which is now a very popular source of clean energy, having had an exponential growth in the last two decades (see Fig. 1) and currently generating about 2.5% of global electricity supply [2]. This growth has been forecasted to continue, as the amount of global electricity that could be supplied by wind in 2020 is estimated to be between 8 and 12% [2].As the typical WT is designed for at least a 20 year life time, there is an essential need for through-life support in order to sustain the continuous operation of the WTs at a minimum lifecycle cost. However, designing, delivering and most especially, supporting WTs are not without challenges, one of which is as a result of the nature of their operating environments (offshore locations in particular). Also, as governments reduce or pull out from subsidies and tax credits, the industry is faced with a challenge of cost reduction (both on the product design and manufacture, and the O&M costs) so as to be as competitive as the conventional and nuclear power sectors with relatively low cost of energy.This paper is in two parts: the first half explores the original topic of TES in the wind industry, presented by the authors in an earlier publication [1], by identifying the state-of-the-art and current challenges of TES in the wind industry. Also, a forward looking perspective is taken by identifying possible opportunities which could address the challenges and meet future TES needs and requirements in the industry. The second half presents a case study on WT gearbox through-life support, which takes further previous work by the authors (see [1]) by going through the key steps of identifying the TES requirements and needs and its implementation. A focus will be placed on how TES can be applied to offshore WFs since the impacts of poorly understood and executed inservice phase on O&M costs are far greater in offshore applications, and furthermore offshore wind is still in its nascent stages [4].The main contributions of this paper is as follows:This paper closes the gaps in literature in the topic of TES in the wind industry. As at the time of writing this paper, there was little literature in the research domain that dealt with the topic which is of importance for the wind industry. The past decade has seen exponential yearly growth in installed capacity wind energy power generation. As a result, wind farm (WF) projects have evolved from small scale isolated installations into complex utility scale power generation systems comprising of arrays of large wind turbines (WTs), which are designed to operate in harsh environments. However, this has increased the need for through-life engineering service (TES) for WTs especially in offshore applications, where the operations and maintenance (O&M) becomes more complicated as a...

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“…In addition, although sensing techniques such as vibration monitoring have been shown to be effective when detecting surface damage in bearings [12,13] , they cannot detect subsurface cracks. However, acoustic emission sensors have shown promising results when detecting subsurface crack formation in rolling element bearings [14,15] .…”

Section: Introductionmentioning

confidence: 99%

A study of white etching crack bearing failure detection using electrostatic sensing in wind turbine gearboxes

Esmaeili¹,

Harvey²,

White³

et al. 2018

int j cond monitor

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White etching cracks (WECs) have been found to form in rolling element bearings as early as 6-24 months into operation, especially in large wind turbine gearboxes [1] . [2,3] . [4] . [3] . To investigate the feasibility of WEC detection using the electrostatic (ES) sensing technique, an ES wear site sensor was installed on a bearing test-rig where WECs had been created under the influence of electrical load. The ES responses were compared with those from an acoustic emission (AE) sensor that had been shown to detect WEC failures in a previous study The physical findings related to WEC failures in the bearings and basic analysis of the sensor signals have been reported in a parallel paper by Zuercher et al

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Analysing RMS and peak values of vibration signals for condition monitoring of wind turbine gearboxes

Cited by 122 publications

References 32 publications

The estimation of machining results and efficiency of the abrasive electro-discharge grinding process of Ti6Al4V titanium alloy using the high-frequency acoustic emission and force signals

The estimation of machining results and efficiency of the abrasive electro-discharge grinding process of Ti6Al4V titanium alloy using the high-frequency acoustic emission and force signals

Through-life engineering services of wind turbines

A study of white etching crack bearing failure detection using electrostatic sensing in wind turbine gearboxes

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