Validation of blocked-force transfer path analysis with compensation for test bench dynamics

Abstract

This paper presents a validation of the Blocked-Force Transfer Path Analysis (BF-TPA) method that was proposed earlier in 2009 as the Gear Noise Propagation (GNP) method. The method allows to simulate the propagation of noise and vibrations generated by a system component to responses elsewhere in the system. The total systems FRFs are needed in combination with a measurement of the system’s component on a rigid test bench. Although the method is physically correct, a rigid test bench is hard to design up to higher frequencies. Therefore a compensation method for the test bench dynamics was derived. This paper validates the BF-TPA for a vehicle steering gear with and without compensation for its test bench dynamics. In order to be successful, a technique is introduced to obtain the required Rotational DoFs and Moments on both the component test bench measurement and total system FRFs.