Decomposed vibro-acoustic frequency response functions for the prediction of radiated sound

Barton, Lucy

Abstract

There are several methods employed to conduct analysis of vibrations in structures. These
methods can be applied to various problems caused by vibrations, such as external noise, and
also to monitor the behavior of the source or structure which is either producing or
transmitting these vibrations. This project aims to work towards the development of a method
which can conduct real-time prediction of radiated vehicle noise whilst also performing
structural health monitoring in the presence of unmeasured background noise sources.
In order to predict receiver response from a vibro-acoustic sound source, several techniques
can be employed to mathematically predict the acoustic emissions from a vibrating structure.
In this case, the source- receiver assembly will be analysed using in-situ transfer path analysis
to determine the frequency response functions and blocked forces of the structure to predict
exterior noise. A novel volume velocity source will be used in conjunction with established
blocked forces method of radiated noise prediction for calculating the noise produced by a
plate in an anechoic chamber when excited by multiple vibration sources.
Further to this, a Singular Value Decomposition (SVD) approach is used to determine a
description of predicted modes, with a view to implement the foundations of a method for
condition monitoring and exterior noise emission prediction of complex structures due to
vibro-acoustic excitation. A method including elements of the blocked force calculation, in
combination with a modal analysis technique based on Singular Value Decomposition and
the Blocked Force technique is investigated. This is conducted using an experiment based on
the radiation of a plate with multiple vibration sources, with the aim to use decomposed
transfer functions to predict the contribution to the radiated noise from a particular mode or
group of modes.

Citation

Barton, L. (2023). Decomposed vibro-acoustic frequency response functions for the prediction of radiated sound. (Thesis). University of Salford

• Thesis Type: Thesis
• Deposit Date: Jun 2, 2023
• Publicly Available Date: Jul 3, 2023
• Award Date: Jun 2, 2023