The FRF based substructuring method aims to predict the dynamic characteristics of a complete structure from predetermined response functions of the comprising uncoupled substructure and coupling mounts. This modular approach provides a powerful tool whereby the global frequency characteristics of a coupled structure are described in terms of component frequency response function matrices.
Hence, the global influence of substructure modifications can be easily assessed by reformulating the FRF based coupling equations with the relevant altered substructure response functions matrix included.
Within the scope of this project, FRF based substructuring technique has been applied for the coupling of a suspension to a car body structure (Renault passenger's car). The body-noise transfer functions, important to quantify contributions to the operational interior noise in a car, between input on the wheel and pressure inside the car have been calculated by substructuring and validated against integrated validation test.
This study has been performed by a full experimental approach, by which different components in the suspension and car body are represented by their measured frequency response function models.
