BEMÆRK: Ansøgningsfristen er overskredet
The section for Solid Mechanics at the Department of Civil and Mechanical Engineering (DTU Construct) of the Technical University of Denmark invites applicants for a 3-year PhD position in the field of “Multi-physical modelling combining solid and fluid mechanics for radial and thrust air foil bearings” with super visor Professor Ilmar Santos. The objective of the project is to be able to adequately describe the nonlinear behaviour of air foil bearings originating from the use of a bump foil surface structure.
Oil with chemical additives is normally used as a lubricant for fluid film bearings applied to heavy rotating machines. The use of air – clean and abundant in nature – as a lubricant is an excellent green solution. Another advantage of the use of air instead of oil with chemicals is the reduction of friction due to its lower viscosity compared to oil. Nevertheless, the solution imposes serious technological challenges, as i) even tighter manufacturing tolerances to cope with rotor and bearing assembling and the generation of load capacity, ii) a significant reduction of load capacity due to air compressibility in comparison with oil, and iii) lateral vibration instabilities due to the lack of damping.
In the project Green Lubrication: The Design of Air-Bearings for Heavy Machines
– funded by the Independent Research Fund Denmark –
we will work towards creating a novel concept of compliant air-bearings which explores the integration of sensing and actuation systems to improve their weaknesses: load capacity and lack of damping. The integration of sensing systems will allow for online condition monitoring and failure diagnosis, important for their operation under severe conditions of load and speed. Sensing and actuation systems combined with a multi-physics reference model (digital twin) will ensure the efficient design of controllers and their implementation.
In the project we will create accurate multi-physics models based on solid mechanics, fluid mechanics, piezoelectricity, and control theory to describe the static and dynamic behaviour of heavy flexible rotating shafts levitated by air foil bearings under piezoelectrically controlled radial air injection condition.
Responsibilities and qualifications
Your primary objective will be to design the mechanical parts of the air foil bearing, in addition to theoretically and experimentally describing the non-linear behaviour of the mechanical aspects of the bearing, i.e., bump foil dynamics and collaborate in the creation of a model that described the passive, and active air foil bearing dynamics, which is used to create a controller for the system.
Your overall focus will be to strengthen the department’s competences within computational modelling of design and optimization of components for the development of new energy technologies. You will work with nearby colleagues, and with both academic and industrial partners in Denmark as well as abroad. Your primary tasks will be to:
- Teach and supervise BSc and MSc student projects and be co-supervisor for PhD students.
- Plan, design and build a mathematical model describing the nonlinear foil dynamics.
- Plan, design and carry out laboratory experiments.
- Build and maintain test equipment relevant for the project.
- Develop control strategies based on the modelled system.
- Collaborate and communicate with both academic and industrial partners.
You must have a two-year master's degree (120 ECTS points) or a similar degree with an academic level equivalent to a two-year master's degree.
Because of the multidisciplinary nature of the project, you must have an interest and possess a strong theoretical and computational in the fields of solid mechanics, fluid mechanics and control theory.
You are expected be able to work independently and be confident in both written and spoken English. In addition, the applicant should be ambitious and strive towards scientific excellence.
You must be able to handle theoretical, numerical, as well as experimental workloads.
As a candidate it is necessary that you have:
- Knowledge and experience with programming, preferably in MATLAB or Python.
- Knowledge and/or experience with non-linear finite element modelling.
- Knowledge and/or experience with computational fluid dynamics modelling.
- Knowledge and/or experience with non-linear vibrations.
- Knowledge and/or experience with tribology.
- Knowledge and/or experience with rotor dynamics.
- Knowledge and/or experience with control theory.
- Knowledge and/or experience with experimental work and postprocessing.
- Ability to work independently, to plan, and to carry out complicated tasks and to be pard of a large dynamic group.
- Knowledge and/or experience with design and construction of test set-ups is preferred.
- Experience with teaching and/or supervision is preferred.
Approval and Enrolment
The scholarship for the PhD degree is subject to academic approval, and the candidate will be enrolled in one of the general degree programmes at DTU. For information about our enrolment requirements and the general planning of the PhD study programme, please see DTU's rules for the PhD education
.
We offer
DTU is a leading technical university globally recognized for the excellence of its research, education, innovation and scientific advice. We offer a rewarding and challenging job in an international environment. We strive for academic excellence in an environment characterized by collegial respect and academic freedom tempered by responsibility.
Salary and appointment terms
The appointment will be based on the collective agreement with the Danish Confederation of Professional Associations. The allowance will be agreed upon with the relevant union. The period of employment is 3 years. The position is available from 1 January 2024 or as soon as possible thereafter.
You can read more about career paths at DTU here http://www.dtu.dk/english/about/job-and-career/working-at-dtu/career-paths.
Further information
Further information may be obtained from Ilmar Santos ilsa@dtu.dk
.
You can read more about Department of Civil and Mechanical Engineering at https://construct.dtu.dk/
.
If you are applying from abroad, you may find useful information on working in Denmark and at DTU at DTU – Moving to Denmark
. Furthermore, you have the option of joining our monthly free seminar “PhD relocation to Denmark and startup “Zoom” seminar
” for all questions regarding the practical matters of moving to Denmark and working as a PhD at DTU.
Application procedure
Your complete online application must be submitted no later than 8 September 2023 (23:59 Danish time)
. Applications must be submitted as one PDF file
containing all materials to be given consideration. To apply, please open the link "Apply now", fill out the online application form, and attach all your materials in English in one PDF file
. The file must include:
- A letter motivating the application (cover letter)
- Curriculum vitae
- Grade transcripts and BSc/MSc diploma (in English) including official description of grading scale
You may apply prior to obtaining your master's degree but cannot begin before having received it.
Applications received after the deadline will not be considered.
All interested candidates irrespective of age, gender, race, disability, religion or ethnic background are encouraged to apply. In the machine elements research group, we strive to attract talented young researchers who can spearhead the technological development in rotor dynamics and machine elements through scientific excellence with supportive mentoring, and a charismatic research group.
DTU Civil and Mechanical Engineering develops and utilizes science and technical knowledge for the benefit of society and the sustainable development. We undertake research, education, innovation, and scientific advice of the highest quality within building design and processes, building construction and safety, building energy and installation, solid mechanics, fluid mechanics, materials technology, manufacturing engineering, engineering design and thermal energy systems.
Technology for people
DTU develops technology for people. With our international elite research and study programmes, we are helping to create a better world and to solve the global challenges formulated in the UN’s 17 Sustainable Development Goals. Hans Christian Ørsted founded DTU in 1829 with a clear mission to develop and create value using science and engineering to benefit society. That mission lives on today. DTU has 13,500 students and 6,000 employees. We work in an international atmosphere and have an inclusive, evolving, and informal working environment. DTU has campuses in all parts of Denmark and in Greenland, and we collaborate with the best universities around the world.
INFORMATIONER OM STILLINGEN:
- Arbejdspladsen ligger i:
Lyngby-Taarbæk Kommune
-Virksomheden tilbyder:
-Arbejdsgiver:
Danmarks Tekniske Universitet, Anker Engelunds Vej, 2800 Kongens Lyngby
-Ansøgning:
Ansøgningsfrist: 08-09-2023; - ansøgningsfristen er overskredet
Ved skriftlig henvendelse: https://efzu.fa.em2.oraclecloud.com/hcmUI/CandidateExperience/da/sites/CX_1/job/2250
Se mere her: https://job.jobnet.dk/CV/FindWork/Details/5895143
