The project is expected to develop and test a solution that can be implemented on two-stroke engines on large seagoing vessels. The technology has the potential of improving total propulsion efficiency by 2-3% predicted for North Atlantic passage and reducing fuel consumption and emissions accordingly.
The Dynamic Propeller Shaft Speed Control Project has resulted in a technology readiness level 8 prototype based on patented technology. The unit has been at sea since October 2016, on board Clementine Maersk. Real time data are collected by the equipment and sent back for analysis every month. Results are so promising that analysis continues in order to explore the commercial potential.
Following theoretical analysis of cross inflow to propellers, using model test data from earlier experiments at FORCE Technology, and recordings made on the full scale Maersk vessel (Luna Maersk) back min the 1980ties, we identified the wake parameters for the Luna Maersk propeller and hull form. Based on this, we scrutinized the natural propulsion losses that occur in waves. We made an estimation of the losses for Clementine Maersk using statistical year-round weather information, and we designed comprehensive simulation facilities that could run faster than real time on a myRio hardware platform (National Instruments). This simulator was later used for hardware in the loop testing at Lyngsø Marine, and it was used on board Clementine for testing every time we had made a code change, before porting the updated code to the control platform. When controlling a 60 MW diesel engine, there is no room for mistakes.
We developed a prototype of the DPC unit using Lyngsø Marine type approved hardware and firmware, on top of which we integrated our software. The DPC unit was installed without problems on Clementine Maersk and has been in daily use on board since the second sea test in October 2016.
The DPC hardware plus software has proven to be a reliable test platform that has demonstrated the dependability and capability of the DPC product.
With the product being in daily operation at sea for 7 months by now, we have obtained a technology readiness level TRL 8.
