A framework for the propagation of uncertainty in Transfer Path Analysis. (29th September 2020)

• Record Type: Journal Article
• Authors: Meggitt, J.W.R.; Moorhouse, A.T.; Wienen, K.; Sturm, M.
• Is Part Of: Journal of sound and vibration. Volume 483(2020)
• Publication Date: 2020-09-29
• Subjects: Transfer Path Analysis -- In-situ -- Component -- Blocked force -- Dynamic sub-structuring -- Uncertainty propagation; Sound -- Periodicals; Vibration -- Periodicals; Son -- Périodiques; Vibration -- Périodiques; Sound; Vibration; Periodicals; Electronic journals; 620.205
• DOI: 10.1016/j.jsv.2020.115425
• Languages: English
• ISSNs: 0022-460X

Abstract

Abstract: Transfer Path Analysis (TPA) is a test-based methodology used to analyse the propagation of noise and vibration in complex systems. In this paper we present a covariance based framework for the propagation of experimental uncertainty in classical, blocked force, and component-based TPA procedures. The presence of both complex and correlated uncertainty is acknowledged through a bivariate description of the underlying uncertainty. The framework is summarised by a series of equations that propagate uncertainty through the various stages of a TPA procedure i.e. inverse source characterisation, dynamic sub-structuring, and forward response prediction. The uncertainty associated with rank ordering of source contributions is also addressed. To demonstrate the proposed framework a numerical simulation is presented, the results of which are compared against Monte-Carlo methods with good agreement obtained. An experimental study is also presented, where a blocked force TPA is performed on an electric steering system. The proposed uncertainty framework requires no additional experimental effort over and above what is performed in a standard TPA and may therefore be readily implemented into current TPA practices.