Literature review of Direct Field Acoustic Noise (DFAN) testing

Hargreaves, JA

Abstract

This report gives a comprehensive review of the state of the art in Direct Field Acoustic Noise (DFAN) testing based on published literature and product data. This is supplemented by background theory and selected best practice from other related disciplines. The report also aims to perform ‘horizon scanning’, and several suggestions are made for possible areas of future research and development.

DFAN is found to be a maturing technology that is a suitable choice for high intensity acoustic testing of space-launch payloads. It does, however, bring its own set of unique challenges that require addressing. These are grouped into seven areas for future development in the concluding chapter.

The most pressing needs, in our opinion, are for improved strategies for control of low frequency modes and methods for experimental assessment of diffuse fields. Both exploit practices that have been proven in room acoustics applications. These research questions could be explored through a mixture of simulation and experimentation and findings here would inform industrial best practice.

Citation

Hargreaves, J. Literature review of Direct Field Acoustic Noise (DFAN) testing

• Report Type: Technical Report
• Deposit Date: Apr 29, 2022
• Publicly Available Date: Apr 29, 2022
• Additional Information: Funders : RAL Space (UKRI)