Structure-borne noise assessment of automotive componentsusing theblocked force approach

Abstract

Changes in the vehicle industry have heightened the demand for performing acoustic and vibration analysis earlier in the product development process. This is challenging as NVH issues are often identified during full system integration, when design changes are costly and limited due to frozen vehicle configurations. To address this, virtual prototypes can be developed where components are independently characterized at their interfaces and transferred between assemblies. A major limitation of this approach is that vibration forces from source components are not inherently independent, as interface forces obtained through conventional methods depend on boundary conditions and are therefore not transferable between systems. To over come this, the in-situ blocked force method has been introduced to characterize source components such that the resulting interface forces are intrinsic to the source and independent of the receiving structure. This thesis presents a case study applying the in-situ blocked force method to an electro-hydraulic steering pump as a source component. The objectives are to validate the in-situ blocked force method, demonstrate that the derived blocked forces are independent of the receiving structure and transferable between systems, and establish a workflow for digital twin based acoustic and vibration analysis. The results show good consistency of the derived blocked forces across two dynamically di!erent receiving structures. This consistency is confirmed through cross-validation between test configurations. Furthermore, the developed digital twin enables component-based transfer path analysis and the simulation of modification scenarios