Errors Associated with Transfer Path Analysis when Rotations are not Measured

Previously we had found significant errors in the interfacial force results for a source-path-receiver system where only translational motions were measured. This paper examines the sources of those errors by using computational finite and boundary element models. The example case consists of a source structure (with few modes), a receiver (with many modes) and three steel rod paths. We first formulate indirect, yet exact, methods for estimating interfacial forces, by assuming that six-dimensional motions at any location are available though we focus on only the driving points. One- and three-dimensional sub-sets of the proposed formulation are compared with the six-dimensional theory in terms of interfacial force and partial sound pressure spectra.

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See papers presented at SAE 2007 Noise and Vibration Conference and Exhibition, May 2007, St. Charles, IL, USA, Session: Numerical Methods: Vibro Acoustic Analysis (Part 2 of 4)

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