Solutions to improve accuracy in experimental measurement of the dynamic response of resilient mountings for marine diesel engines

In the paper, after an introduction to the standards by which tests are performed and a presentation of the test rig used at the Ship Noise and Vibration Laboratory of the University of Trieste, outcomes of a series of experiments is discussed, carried out on a resilient mounting specifically designed for medium speed marine diesel engines. The aim of the experimental campaign is to design laboratory tests leading to a measurement of the dynamic transfer stiffness comprehensive of some interaction effects due to the coupling between engine foot and resilient element. The research is explained by the need of better understanding how the boundary conditions at the top casting of the resilient mounting influence the dynamic transmissibility to the foundation. Results are widely discussed, giving also suggestions for further improvement of the laboratory tests.