PROJECT TITLE: Methodology Evolution of Lifetime Calculation for Axial Piston units based on Comprehensive Load Cycle Determination
PhD period: 2017.07.01 – 2020.06.30. (has been prolonged till 2021.06.30)
Section: Fluid Power and Mechatronic Systems
Research Programme: Efficient, Intelligent and Reliable Fluid Power Technology
Supervisors: Henrik C. Pedersen and Robert Rahmfeld (Danfoss PS)
Co-Supervisor: Andreas Schumacher (Danfoss PS)
Collaborator: To be announced later.
Funding: Danfoss Power Solutions.
The objective of this project is a revision of the outdated lifetime calculation methodology for hydrostatic axial piston units, i.e. pumps and motors. These units are typically used in drivetrains of mobile off-road machinery, e.g. agricultural, construction and forestry machines. The availability (uptime) of these machines is the key requirement in field. This leads to the demand to be able to calculate the lifetime accurately, to ensure the components will not fail within the demanded lifetime.
In contrast to the lifetime requirement mentioned above, the research focus has been on increasing efficiency and performance of these pumps and motors for the last decades and less in the field of lifetime prediction. The last publications related to lifetime predictions date back into the 70s/80s. Combined with the increased power requirements (increased pressure and flow rate), to raise performance and ground coverage, the traditional design rules and guidelines are of limited use when predicting lifetime.
This proposed work will address the knowledge gap described above. Additionally, the objective is a revision of the existing methods to calculate the lifetime for these hydrostatic axial piston units. Thus, based on an analysis of the current methods, operation cycles as well as failure modes, a more accurate and reliable prediction method will be derived. A key part of the project will be experimental validation of the methodology to validate the reliability and accuracy of the new results - an important must-know for daily use.
Publications in journals and conference papers may be found at VBN.