PhD Scholarship In Tribology 2010 – Denmark
PhD Scholarship In Tribology For Master Degree 2010 In Denmark
Introduction:
The yaw bearing, in most turbine designs, is a costly double race ball bearing that is able to absorb both radial and axial forces and a significant bending moment. The development of ever larger wind turbines means that the threshold for the use of rolling element bearings as the seating of the nacelle is approaching and that a technology shift may be necessary in the future.
Background:
Possible alternatives to the classic yaw roller bearings, include oil-lubricated hydrodynamic or hydrostatic bearings and grease lubricated plain bearings with metallic or polymer sliding surfaces.Brake technology in the wind turbine industry is getting increased focus. In the yaw system application, the tribological conditions in the brake are in many ways comparable to those present in metal forming processes (insignificant speeds, low transient temperatures and surface pressures comparable to the yield strength of the materials involved).The two components (bearings and brakes) may be matched in future designs. The phenomenon of brake bedding-in relates to contradicting requirements when looking at surface contact. To reduce wear, lubricants with EP additives are normally used, but these additives will on the other hand form a surface layer on the bearing (or brake) parts so that the coefficient of friction will be lowered.In existing wind turbines the yaw motion is typically achieved with gear motors with an added external open pinion and gear contact. A number of special propulsion technologies have been developed for small scale systems, such as harmonic gears, peristaltic systems and piezoelectric motors. So far none of these technologies have been applied to large scale structures. In the Yaw Drive Unit project the ambition is to investigate for novel propulsion technologies.
Qualifications:
Candidates should have a master’s degree in engineering or a similar degree with an academic level equivalent to the master’s degree in engineering. Candidates with prior knowledge in machine elements, tribology and experimental work are preferred.
Approval And Enrolment:
The scholarships for the PhD degree are subject to academic approval, and the candidates will be enrolled in one of the general degree programmes of DTU. For information about the general requirements for enrolment and the general planning of the scholarship studies, please see the DTU PhD Guide.
Salary And Appointment Terms:
The salary and appointment terms are consistent with the current rules for PhD degree students. The period of employment is 3 years with start as soon as possible after the enrolment.
Further information:
Further information may be obtained from Professor Peder Klit, tel: +45 4525 6267.You can read more about Department of Mechanical Engineering” on www.mek.dtu.dk.
Application:
We must have your online application by August 2, 2010. Please open the link “apply for this job online” and fill in the application form and attach your application, CV and information about academic grades.All interested candidates irrespective of age, gender, race, religion or ethnic background are encouraged to apply.DTU Mechanical Engineering covers the fundamental engineering disciplines within Naval Architecture and Offshore Engineering, Energetics, Solid Mechanics, Fluid Mechanics, Thermodynamics, Control and Engineering Design, Hydrodynamics, Structural Engineering and Materials. It has a scientific staff of about 100 persons, 80 Ph.D. students and a technical/administrative staff of 50 persons
Address:
Technical University of Denmark
International Affairs
Anker Engelunds Vej 1, Building 101A
DK 2800 Kgs. Lyngby
E-Mail: intcouns@adm.dtu.dk
Phone No: +45 4525 1023
Fax:+45 4587 0216
Last Date To Apply:August 2, 2010
Source:http://www.dtu.dk/English/About_DTU/vacancies.aspx?guid=e679bc80-4fa2-4dce-9a7e-9811c16322d9
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