Novel lubrication system to improve the excessive wear in wind turbine yaw and pitch gears

dc.contributor
Universitat Politècnica de Catalunya. Departament d'Enginyeria Mecànica
dc.contributor.author
Farré Lladós, Josep
dc.date.accessioned
2017-03-29T15:50:16Z
dc.date.available
2017-03-29T15:50:16Z
dc.date.issued
2015-04-28
dc.identifier.uri
http://hdl.handle.net/10803/401832
dc.description.abstract
Manufacturers of wind turbines have observed a new phenomenon that appears in high power wind turbines: excessive wear in the teeth located at 0º in the pitch bearing. In order to design more efficient wind turbines, manufacturers are increasing the rotor diameter to capture more kinetic energy from the wind to generate more energy, therefore the stress in the joints/unions is increased, which leads to the elastic deformation of the system. These stresses and deformations increase in all parts of the wind turbine, the foundations and the tower, yaw, nacelle, drive train and blade unions. All these cases are mainly static unions, except the drive train that transmits torque, the yaw system that turns the nacelle and the pitch system that turns each blade around its axis. The weight of the blades under movement, always working in the most efficient position, causes micro-movements allowed by the elastic deformations and the backlash of the gear transmission that induce an excessive wear at the zero degree position. The same phenomenon is observed in the yaw system, though to a lesser extent. Despite the manufacturer's efforts, a solution that could be implemented in the near future or easily retrofitted in the wind turbines does not yet exist. The aim of this PhD project is to improve the lubrication of the pitch and yaw gear systems of wind turbines through the use of a novel lubrication system based on an array of micro-fabricated channels fitted at the gears' root (dedendum). A micro-nozzle to continuously inject fresh grease in between the teeth in contact has been designed, manufactured and installed in a test bench of a 2 MW wind turbine pitch system. The test bench has been used to characterize the fatigue behavior of the gear surface using conventional wind turbine greases under real cyclic loads, showing a delay of 2x10^4 cycles in the appearance of wear. The proposed micro-nozzle is expected to be compatible with and easily implemented into both newly designed and in-market models. This novel lubrication system will inject fresh lubricant to the gear contact area even when the wind turbine is generating electricity.
dc.format.extent
121 p.
dc.format.mimetype
application/pdf
dc.language.iso
eng
dc.publisher
Universitat Politècnica de Catalunya
dc.relation
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dc.rights.license
ADVERTIMENT. L'accés als continguts d'aquesta tesi doctoral i la seva utilització ha de respectar els drets de la persona autora. Pot ser utilitzada per a consulta o estudi personal, així com en activitats o materials d'investigació i docència en els termes establerts a l'art. 32 del Text Refós de la Llei de Propietat Intel·lectual (RDL 1/1996). Per altres utilitzacions es requereix l'autorització prèvia i expressa de la persona autora. En qualsevol cas, en la utilització dels seus continguts caldrà indicar de forma clara el nom i cognoms de la persona autora i el títol de la tesi doctoral. No s'autoritza la seva reproducció o altres formes d'explotació efectuades amb finalitats de lucre ni la seva comunicació pública des d'un lloc aliè al servei TDX. Tampoc s'autoritza la presentació del seu contingut en una finestra o marc aliè a TDX (framing). Aquesta reserva de drets afecta tant als continguts de la tesi com als seus resums i índexs.
dc.source
TDX (Tesis Doctorals en Xarxa)
dc.subject.other
Àrees temàtiques de la UPC::Enginyeria mecànica
dc.title
Novel lubrication system to improve the excessive wear in wind turbine yaw and pitch gears
dc.type
info:eu-repo/semantics/doctoralThesis
dc.type
info:eu-repo/semantics/publishedVersion
dc.subject.udc
531/534
dc.subject.udc
621
dc.contributor.director
Casals Terré, Jasmina
dc.contributor.codirector
Westerberg, Lars-Göran
dc.embargo.terms
cap
dc.rights.accessLevel
info:eu-repo/semantics/openAccess


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