High-Resolution Acoustic Imaging and Noise Localisation Based on Non-Synchronous Measurements of Direct-Drive Blower Characteristic Frequencies

In industrial scenarios, direct-drive blowers are essential for operations such as exhaust emission control, air ventilation, compression, and conditioning. Their continuous operation often results in substantial noise pollution. The unusual level of noise is usually associated with mechanical failures or design flaws. This paper focuses on simulated non-synchronous measurements (NSM) for high-resolution acoustic imaging and noise localisation of direct-drive blowers at characteristic fre-quencies. The acoustic imaging results of single measurement and Joint Maximum A Posterior (JMAP) of NSM are compared in the paper. The results indicate that the JMAP of NSM method provides sharper imaging quality with fewer side lobes and higher resolution. The results will be used to guide the application of NSM in industrial scenarios to monitor the direct-drive blowers' operational conditions and optimize noise reduction designs.