search.noResults

search.searching

note.createNoteMessage

search.noResults

search.searching

orderForm.title

orderForm.productCode
orderForm.description
orderForm.quantity
orderForm.itemPrice
orderForm.price
orderForm.totalPrice
orderForm.deliveryDetails.billingAddress
orderForm.deliveryDetails.deliveryAddress
orderForm.noItems
GEARBOXES


FEATURE SPONSOR


MINIMISING PREMATURE WIND GEARBOX BEARING FAILURE


Despite high wind turbine availability (> 96%, depending on the turbine), and a relatively low failure rate of mechanical components compared with electrical components, failures on mechanical drive trains still create high repair costs and revenue loss due to long periods of downtime


However, the trend to increasing turbine sizes, erected at locations with turbulent wind conditions, puts significant challenges on the rolling bearings in the drive train and can contribute to premature gearbox bearing failures.


Failures are traditionally seen at key bearing locations, namely the planet bearings, intermediate shaft and high-speed shaft bearings. The root cause of failure is not found inside the bearing alone, but is in the interplay between the bearing, gearbox and turbine, with specific wind conditions leading to disturbed bearing kinematics, loading and lubrication.


KEY FOCUS


In an ideal world, any condition that leads to disturbed bearing kinematics, such as high vibration levels and high sliding friction, should be avoided in order to reduce microwear and high tensile stresses. As this isn’t possible in a wind turbine installation, increasing bearing robustness is a key focus for bearing manufacturers such as SKF.


Based on the company’s knowledge from internal investigations and increased field experience, most early bearing failures are related to lubrication or other surface- related issues and can partly be estimated by the SKF advanced bearing-life model.


FAILURE PREVENTION MEASURES As part of the company’s state-of-the-art failure prevention measures the company has incorporated the following into its bearing production…


» Special passivation to stabilise the near surface microstructure, making the bearing more resistant to


chemical attack and hydrogen, reducing micro friction under peak loading to improve running-in


» Special clean steel for the most stressed components, to further reduce the amount of inclusions that can act


as stress raisers in the material or on the surface


» Deep surface strengthening on the most stressed component (prototypes) to allow a conditioning of the


component to increase the resistance against surface crack initiation and sub-surface crack propagation


PERFORMANCE 34 www.windenergynetwork.co.uk TURBINE PERFORMANCE GEARBOX WEBSITE


TESTING SKF also promotes component testing, combined with real- size dynamic tests to enable the reproduction of damaging operating conditions and the testing of potential solutions, thus minimising premature bearing failure and maximising wind turbine productivity.


David McGaughey Key Account Manager SKF


SCAN/CLICK


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50  |  Page 51  |  Page 52  |  Page 53  |  Page 54  |  Page 55  |  Page 56  |  Page 57  |  Page 58  |  Page 59  |  Page 60  |  Page 61  |  Page 62  |  Page 63  |  Page 64  |  Page 65  |  Page 66  |  Page 67  |  Page 68  |  Page 69  |  Page 70  |  Page 71  |  Page 72  |  Page 73  |  Page 74  |  Page 75  |  Page 76  |  Page 77  |  Page 78  |  Page 79  |  Page 80  |  Page 81  |  Page 82  |  Page 83  |  Page 84  |  Page 85  |  Page 86  |  Page 87  |  Page 88  |  Page 89  |  Page 90  |  Page 91  |  Page 92  |  Page 93  |  Page 94  |  Page 95
Produced with Yudu - www.yudu.com