# Jan-Olov Aidanpää

Luleå University of Technology
Computer Aided Design
Product and Production Development
Department of Engineering Sciences and Mathematics
Jan-Olov.Aidanpaa@ltu.se
+46 (0)920 492531
E218J Luleå
Rotordynamical model of Hydropower rotor and the corresponding Cambell diagram

## Work summary

• Mechanical Vibrations, M0015T, 7.5p
• Dynamics in Mech Systems, M7010T, 7.5p
• Vehicle Dynamics, M0019T, 7.5p

PhD Courses

• Rotordynamics, 9p
• Non-linear Rotordynamics, 9p

Research

• Hydropower Technology, 30%, SVC
• Wind Power, 30%, SWPTC, EM
• Supervisor Florian Thiery, SVC
• Supervisor Erik Synnegård,SVC

Background

During my PhD studies I analysed nonlinear dynamics and chaos in vibro-impacting systems. By that time, it was of interest to evaluate if chaos was something that the industry had to consider in design and if there were any possibilities to use chaos in industrial applications. Today it is clear that nonlinear phenomena can occur in mechanical systems, but it can often be avoided by a careful design. The common question today is therefore how to avoid nonlinear phenomena. In rotating machines there are several nonlinearities that can not be avoided. Therefore nonlinear phenomena have to be considered in the design and there is a need to develop effective tools to handle these situations. Since I came back to the University rotor dynamics has been my research field. Together with my PhD students we have worked on

• Impact problems
• Optimisation of rotating turbo machines
• Wood fibre defibrators
• Industrial fans
• Cutting dynamics
• New tools to analyse nonlinear systems
• Hydro power rotors
• Wind power technology

It is in the field of hydro power rotors that we have published most of the papers. In this field we are today strong and we will continue to expand our activities in this area. In our research we have worked with the rotors interaction with electromagnetic field, bearings and fluid. Through collaboration with the fluid mechanics (LTU) and machine element (LTU), fluid mechanics (Chalmers) and electricity (UU) we have been working with models of the interaction in order to develop better rotor dynamic models.  In the national hydropower centre SVC I am appointed as national leader for the development of rotordynamics in hydropower applications. Therefore we have long term funds for develop of competence in this area. The competence we have achieved in hydropower technology can be applied to other industrial fields and I see great opportunities to develop these new areas.

Since 2012 I am also working in SWPTC as team group leader for cold climat issues in windpower. Within SWPTC I develop models of the anti-/de-icing process to be able to compare and optimize different systems in future.I am also leader of a larger EM-project (Vibrations and loads in wint turbines subjected to ice) with four PhD students and researchers at different divisions at TVM. The aim is to model the creation of ice and iceloads to predict the dynamics and expected life of the turbines in future. The research is mainly supported by;

- SVC, Swedish hydropower center

- SWPTC, Swedish Windpower Technology Center

- EM, The Swedish Energy Agency

## Publications

Conference paper

### A Preliminary Experiment to Excite and Identify Modal Frequencies of a Rotor in the Rotating Frame of Reference (2019)

Gantasala. S, Aidanpää. J
Part of: Proceedings of the 10th International Conference on Rotor Dynamics – IFToMM, s. 265-277, Springer, 2019
Conference paper

### A Preliminary Experiment to Excite and Identify Modal Frequencies of a Rotor in the Rotating Frame of Reference (2019)

Gantasala. S, Aidanpää. J
Part of: Proceedings of the 10th International Conference on Rotor Dynamics, IFToMM, s. 265-277, Springer, 2019
Conference paper

### Fluid added polar inertia and damping for the torsional vibration of a Kaplan turbine model runner considering multiple perturbations (2019)

Soltani Dehkharqani. A, Aidanpää. J, Engström. F, Cervantes. M
Part of: IOP Conference Series, Earth and Environmental Science, Institute of Physics (IOP), 2019, 062007
Article in journal

### Numerical Investigation of the Aeroelastic Behavior of a Wind Turbine with Iced Blades (2019)

Gantasala. S, Tabatabaei. N, Cervantes. M, Aidanpää. J
Energies, Vol. 12, nr. 12
Article in journal

### A Review of Available Methods for the Assessment of Fluid Added Mass, Damping, and Stiffness With an Emphasis on Hydraulic Turbines (2018)

Soltani Dehkharqani. A, Aidanpää. J, Engström. F, Cervantes. M
Applied Mechanics Review, Vol. 70, nr. 5