Noise source analysis of the nitrogen generation system

This study presents a comprehensive noise source analysis of a nitrogen generation system installed at an industrial production facility. The primary goal of the investigation was to determine the location of the dominant noise sources, as well as to identify their respective sound pressure levels and frequency characteristics under operational conditions. Detailed measurements were conducted using a 16-microphone array combined with the CAE Noise Inspector software for accurate sound field visualisation and analysis. Experimental tests were carried out at three distinct locations within the system: the nitrogen generation installation (location 1), the nitrogen storage tank (location 2), and the ejection tube for exhaust gases (location 3), with the latter further subdivided into three specific measurement points (3a, 3b, 3c) to account for variations along the tube length. Each acoustic measurement session lasted three seconds, with data captured at a high recording frequency of 204,800 Hz to ensure precise resolution across the frequency spectrum. The operational cycle of the nitrogen generator was divided into two main phases: phase 1, characterised by the transient sounds associated with valve actuation, and phase 2, dominated by the continuous noise generated during nitrogen transfer to storage tanks and exhaust gas expulsion. Recordings taken at location 1 captured both operational phases, while measurements at locations 2 and 3 were focused exclusively on phase 2 to isolate relevant noise sources. The results provide a detailed and quantitative characterisation of the acoustic emissions associated with the nitrogen generation process, offering valuable insights that can inform the development of targeted noise reduction strategies and contribute to the future optimisation of the system’s mechanical design and operational efficiency.