Correlating Simulation and Testing for Flexibly Coupled Generator Sets
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Caterpillar and Classification Society DNV GL have cooperated to examine the torsional vibration response of diesel engines powering flexibly coupled two-bearing generators in diesel-electric propulsion systems. Aside from resolving a specific issue, the exercise highlighted potentially larger torsional loading on engines optimised for new NOx limits and resulted in a recommendation that gas force excitation values be updated to match current engine ratings.
Caterpillar and Classification Society DNV GL have cooperated to better understand the torsional vibration response of Caterpillar diesel engines powering flexibly coupled two-bearing generators in a diesel-electric marine propulsion system where the generator is driven through a stub-shaft mounted coupling at the end away from the engine flywheel. Activities included the measurement of system torsional response and the correlation of torsional vibration simulation results. Measured data included cylinder pressure at...
KeywordsTorsional Vibration Cylinder Pressure Tangential Pressure Coupling Stiffness Engine Rating
The authors would like to thank several people for their contributions to this paper, including co-author Alfredo R. Carella who at the time of the project was Senior Engineer. Machinery & Systems at DNV GL - Maritime Advisory, as well as Lin Zhu of Caterpillar Inc. for collecting the test data reported here; and Johan Johansson Iseskär, Erik Brodin and Geir Dahler of DNV GL, John Baus and Adam Kania of Caterpillar, and Petter Stjernstrøm of Pon Power Scandinavia for the support and collaboration that made this project possible.