Substructuring approach and blocked forces method: application for structure-borne vibration prediction in heavy weight assemblies

摘要

Prediction of vibration levels in heavy structures enables engineers to adopt vibration mitigation measures in the initial design stages, therefore reducing costs and time taken for construction or installation. Different strategies for achieving accurate predictions range from numerical methods, such as FEA and SEA, to methods incorporating measured data. Here, we present an experimental method that combines the substructuring approach with the in-situ blocked forces method to characterise the key elements of an assembly. In order to implement this methodology, the assembly is subdivided into the components vibration source, isolator and receiver. These three elements are characterised by performing mobility measurements on the individual substructures and the source is additionally characterised by the blocked force measured in-situ. Predictions made using the independent component characterisations are compared with measures obtained from a whole assembly composed of a heavy structure supported on resilient isolators.