Application of innovative beamforming antennas and resolution improvement algorithms to achieve noise reductions on a container lift truck

摘要

A 6 m diameter easy to handle microphone antenna dedicated to beamforming acoustic imaging has been developed. The different steps of the development (microphones distribution optimisation, structure design …) are exposed in this paper. The antenna prototype is validated and its performances assessed. A method aiming to improve spatial resolution, based on Statistically Optimized Array Processor (SOAP) and post-processing deconvolution, is synthetically exposed. The new algorithms are integrated in an acoustic imaging software. When applied on industrial noise sources, the method called beam+ greatly improves spatial resolution compared to beamforming. The newly developed antenna and the resolution improvement technique are both applied on a lift trucks in order to achieve acoustic diagnostics.