Structure-borne sound transmission within electric power steering systems
type: CreativeWork
description: Transfer path analysis (TPA) is an established and valuable tool in the automotive industry, todetermine the contributions of structure-borne sound sources to receiver responses at target positions.The classical TPA approach is based on contact forces at the interface between sourceand receiver to characterise the dynamic loads induced by the source and frequency responsefunctions (FRFs) to quantify the transfer paths of the sound from the interface locations to thetarget positions. With knowledge of the determined contributions it is then possible to decidewhether source loads or FRFs must be improved to optimise the target quantities. Recently a timesaving improvement to classical TPA has been proposed, where the loads arecharacterised using the in-situ blocked force method, so that dismantling of source and receiveris not necessary. This method is therefore called in-situ TPA. However, if the contributions ofinternal structure-borne sound sources to the overall vibro-acoustic behaviour of a product aredesired it is of benefit if the target quantities are blocked forces. Thus it would be possible tovirtually couple the product with the properties of an overall receiver. Therefore this thesis presentsa TPA approach called “blocked force transmissibility transfer path analysis” (bfTPA). Inthis context, the proposed internal-source-path-receiver-model (ISPRM) poses the theoreticalbasis of bfTPA. The aim of the presented novel TPA is to determine the contribution of internalstructure-borne sound sources to an overall target quantity of a product. The presented approachuses the vector of in-situ blocked forces measured externally at the contact interface of theoverall product and a corresponding set of “blocked force transmissibility” (BFT) functionsrelating the external coupling degrees of freedom (DOFs) to the internal source DOFs in order to propagate the external in-situ blocked forces back to multiple internal in-situ blocked forces.To prove the methodology of the…
abstract: Transfer path analysis (TPA) is an established and valuable tool in the automotive industry, todetermine the contributions of structure-borne sound sources to receiver responses at target positions.The classical TPA approach is based on contact forces at the interface between sourceand receiver to characterise the dynamic loads induced by the source and frequency responsefunctions (FRFs) to quantify the transfer paths of the sound from the interface locations to thetarget positions. With knowledge of the determined contributions it is then possible to decidewhether source loads or FRFs must be improved to optimise the target quantities. Recently a timesaving improvement to classical TPA has been proposed, where the loads arecharacterised using the in-situ blocked force method, so that dismantling of source and receiveris not necessary. This method is therefore called in-situ TPA. However, if the contributions ofinternal structure-borne sound sources to the overall vibro-acoustic behaviour of a product aredesired it is of benefit if the target quantities are blocked forces. Thus it would be possible tovirtually couple the product with the properties of an overall receiver. Therefore this thesis presentsa TPA approach called “blocked force transmissibility transfer path analysis” (bfTPA). Inthis context, the proposed internal-source-path-receiver-model (ISPRM) poses the theoreticalbasis of bfTPA. The aim of the presented novel TPA is to determine the contribution of internalstructure-borne sound sources to an overall target quantity of a product. The presented approachuses the vector of in-situ blocked forces measured externally at the contact interface of theoverall product and a corresponding set of “blocked force transmissibility” (BFT) functionsrelating the external coupling degrees of freedom (DOFs) to the internal source DOFs in order to propagate the external in-situ blocked forces back to multiple internal in-situ blocked forces.To prove the methodology of the…
author: Zabel, DF
language: en
date published: 2026
date modified: 2026-07-24T04:26:26Z
provider: U. of Salford
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: U. of Salford