Design & Development of Flange Connection for Robust Torque Transfer in Marine Propulsion System
Examensarbete för masterexamen
Product development (MPPDE), MSc
Marine propulsion systems undergo a multitude of varying loads, which can be due to resonances, engine torque peaks, ice propeller impacts and marine propulsion itself. The stresses experienced by the propeller are propagated throughout the length of the shaft. The flange faces, connecting the propeller to the engine gearbox, is subjected to both axial and shear forces. Caterpillar propulsion utilizes a combination of bolts and expansion dowels at the flange faces to absorb these forces. The focus of the project was to develop an improved design for the expansion dowels, in terms of manufacturability and cost. The Product development methodology and Advanced Product Quality Planning Framework were followed for developing a new concept. The developed solution works on the principle of ’wedge effect’ to achieve the required interference fit. The final solution is designed for ease of manufacturing and also enables ease of assembly. The final product was simulated in virtual conditions. Static analysis was done so as to fulfill all the requirements from the classification societies. Virtual Prototyping was done to simulate the worst-case conditions, like the peak transient torque acting on the flange faces, to validate the robustness of the solution. Attempts were made to answer the research questions in the end. The final product was also checked for fulfillment of target specifications to see if the project has achieved the purpose it had set out for.
Advanced Product Quality Planning, Product Development, Quality Function Deployment , static design analysis, Virtual prototyping, expansion dowel, interference pin, flange connection, shear pin