PhD Stipend in Prognostic Control and Predictive Maintenance for Variable-speed Electro-Hydraulic Drive Systems (14-21035)

Updated: about 2 months ago

PhD Stipend in Prognostic Control and Predictive Maintenance for Variable-speed Electro-Hydraulic Drive Systems (14-21035)

At the Faculty of Engineering and Science, Department of Energy Technology a PhD stipend is available within the general study program Energy Technology. The stipend is open for appointment from 1 September 2021- 31 August 2024. Aalborg University contributes to the knowledge building of the global society as well as the development of prosperity, welfare and culture of Danish society. This is accomplished through research, research-based education, public sector services and knowledge collaboration. AAU educates students for the future and activities are based on a dynamic and transformative collaboration with the surrounding community. Read more about AAU at The Department of Energy Technology is a dynamic engineering research department in continuous growth and inspiring surroundings. The department has a very international environment and covers all areas of clean and sustainable energy systems of the future within electrical, thermal and mechatronic energy technology. The department has campuses in both Aalborg and Esbjerg, this position is placed i Aalborg. The mission is to be world leading in both research and research-based education of the energy engineers of the future. The department has approx. 300 employees of many nationalities, of which 24 are administrative staff. In addition, the department constantly has approx. 50-70 guest researchers from around the world. Research and teaching are in the absolute world elite in the field of energy, and we have extensive and leading workshop and laboratory facilities, where research and innovation are carried out in direct collaboration with industry to a great extent. Read more about the Department of Energy Technology at The position is offered in relation to the research program "Efficient, Intelligent and Reliable Fluid Power Technology" and the PhD Student will be positioned in the Section for Mechatronic Systems.

Job description

The number one challenge in hydraulic transmission technology is low energy efficiency, mainly resulting from the extensive use of throttle valves for flow control. An approach to improve energy efficiency is to replace throttle valves with variable-speed electro-hydraulic drives, featuring highly reduced throttle losses, four quadrant operation, high dynamics and compatibility with current electrification trends, making such drives suitable in electrified machinery and so forth.
The reduced throttling limits fluid degasification requirements, hence fluid reservoirs can be reduced significantly which in turn increases the system level power density compared to conventional technology.  
Variable-speed drives may be realized as standalone self-contained drives or as networks of multiple variable-speed drives sharing electric power supplies and/or hydraulic transmission lines enabling power sharing and energy recuperation.
The tight integration and dependency of components and reduced fluid volumes in variable-speed drive systems pose a new challenge; namely sensitivity to fluid leakages, fluid contamination, component degradation which ultimately may lead to drive functionality loss. Hence, feasibility of the technology necessitates the realization of online prognosis tools enabling maintenance prediction and prognostic control, allowing to negate fluid and component degradation increase, and thereby maintaining drive operation at a certain level to limit production loss.
The objective of this PhD project is to enable online prognosis tools for variable-speed electro-hydraulic drives via state observation and condition monitoring, based on combinations of models and measurement data and the integration into drive controls, effectively realizing prognostic controls.
The project will have a strong focus on industry applications and will be related to ongoing research activities in the field of standalone variable-speed drives and so-called variable-speed electro-hydraulic power regeneration networks, which are currently under development. Hence, a strong focus will be placed on both theoretical developments as well as experimental validation and optimization of these during demonstration in industrial environments. 

You may obtain further information from Associate Professor Lasse Schmidt, Department of Energy Technology, phone: +45 2232 2622, email: , concerning the scientific aspects of the stipend.

PhD stipends are allocated to individuals who hold a Master's degree. PhD stipends are normally for a period of 3 years. It is a prerequisite for allocation of the stipend that the candidate will be enrolled as a PhD student at the Doctoral School of Engineering and Science in accordance with the regulations of Ministerial Order No. 1039 of August 27, 2013 on the PhD Programme at the Universities and Certain Higher Artistic Educational Institutions. According to the Ministerial Order, the progress of the PhD student shall be assessed at regular points in time.
Shortlisting will be applied. This means that subsequent to the deadline for applications the head of department supported by the chair of the assessment committee will select candidates for assessment. All applicants will be informed whether they will be assessed or not.
For further information about stipends and salary as well as practical issues concerning the application procedure contact Ms. Lisbeth Diinhoff, The Doctoral School at The Faculty of Engineering and Science, email: xxx,  phone: +45 9940 9589.
For more information of The Doctoral School of Engineering and Science:  

The application is only to be submitted online by using the "Apply online" button below.
AAU wishes to reflect the diversity of society and welcomes applications from all qualified candidates regardless of personal background or belief.


Appointment and salary as a PhD fellow are according to the Ministry of Finance Circular of 28 June 2019 on the Collective Agreement for Academics in Denmark, Appendix 5, regarding PhD fellows, and with the current Circular of 11 December 2019 on the employment structure at Danish universities.

Vacancy number




Apply online
Share on Facebook Share on Twitter Share on LinkedIn

Online application - some good advice

Aalborg University uses an electronic recruitment system for receiving applications. Towards the bottom in the respective job advertisement you will find a link, which you need to use when applying for the position. Before uploading your application it is important that you have all relevant documentation ready in a Word or PDF format, as you need to upload all material at the same time. You cannot leave the application and return to it a couple of hours later without having to start over.

The system does not support ZIP or images files. Filenames can only contain numbers and letters, and each document must take up no more than 20 MB.
If you experience technical problems, we encourage you to try again. If the technical problems, contrary to expectation, cannot be solved, please contact the member of staff listed as the contact person in the job advertisement.

View or Apply

Similar Positions