Towards a Robust Component Transfer Path Analysis Method: Application and Validation in Automotive Research

Towards a Robust Component Transfer Path Analysis Method: Application and Validation in Automotive Research

Pasma, E.A.

Van Keulen, A. (mentor)
Van der Seijs, M.V. (mentor)

Mechanical, Maritime and Materials Engineering

Precision and Microsystems Engineering

2014-10-24

A robust Transfer Path Analysis (TPA) procedure is presented to predict the transmitted vibrations of a steering gear in BMW vehicles in a multi-kHz range. The internal excitation forces are characterised as a set of equivalent forces on the interface of the active component. These equivalent forces are determined from force and acceleration measurements at the interface of the active component and a test bench. The response of the total system is calculated with the dynamic properties at the component interface onwards to a point of interest in the vehicle. Two equivalent force determination schemes are applied on two test benches with different dynamic properties. The first method relies on direct interface force measurements, whereas the second procedure is based on a matrix inverse procedure on the assembly of the steering gear and the test bench. It is shown that these equivalent forces are indeed a property of the active component only. All methods use the virtual point transformation to build a nodal description on interfaces of the structures. This is a crucial step in Dynamic Substructuring (DS) for the connectivity between the substructures. The projection of measured Frequency Response Functions (FRFs) on local rigid interface displacement modes in a user-specified virtual point, which allow to determine rotational degrees of freedom, that are in practice unmeasurable, yet crucial for the connectivity. Pre-analysis on the transformation to interface degrees of freedom and a sufficient over-determination, enhance noise suppression and mode observability. This method is validated by means of a benchmark of three identical vehicles of which the virtual point dynamics are determined on the interface of the steering gear and the vehicle. For a robust prediction and to get grip on the uncertainties in the analyses, all steps are evaluated separately and qualified with performance indicators.

Robust Component
Path Analysis Method
Automotive Research

http://resolver.tudelft.nl/uuid:50cd45f4-e7ec-40c4-bc0e-d544e95a0e67

2017-01-01

Student theses

master thesis

(c) 2014 Pasma, E.A.