2025_programme: Near-Field Testing and Evaluation Method for Stream Noise of Linear Array Based on Laser Doppler Velocimetry

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  • Day: June 17, Tuesday
      Location / Time: C. THALIA at 09:30 - 09:50
  • Last minutes changes: -
  • Session: 23. Underwater noise modelling and measurements
    Organiser(s): David Barclay, Martin Siderius
    Chairperson(s): David Barclay, Martin Siderius
  • Lecture: Near-Field Testing and Evaluation Method for Stream Noise of Linear Array Based on Laser Doppler Velocimetry
    Paper ID: 2186
    Author(s): Zeng Cao, Xiaojian Wu, Yi Chen
    Presenter: Zeng Cao
    Abstract: Towed linear arrays have widespread applications in ocean monitoring and underwater detection, but their performance is often affected by stream noise. To accurately assess the stream noise characteristics of towed linear arrays in actual operational environments, this study proposes a near-field testing and evaluation method based on Laser Doppler Velocimetry (LDV). This method leverages the high-precision velocity measurement capabilities of LDV and integrates numerical analysis models to achieve precise testing and analysis of stream noise near the towed linear array. Experiments were conducted in a recirculating water channel to measure the stream noise of the linear array, obtaining velocity distribution data of the near-field flow. A numerical model was then utilized to establish the relationship between the flow field and noise, enabling comprehensive stream noise assessment. The results demonstrate that the LDV-based testing method can effectively capture the complex flow field characteristics around the towed linear array and accurately evaluate the stream noise levels. Compared to traditional methods, this approach enables testing within limited spaces, significantly reducing experimental costs and time. This research provides a novel technical means for evaluating stream noise in towed linear arrays, which is crucial for enhancing their performance in practical applications. The proposed method offers significant improvements in efficiency and accuracy, making it an essential tool for optimizing the design and deployment of towed linear arrays in various marine operations.
      Download the full paper
    This paper is a candidate for the "Prof. John Papadakis award for the best paper presented by a young acoustician(under 40)"
  • Corresponding author: Dr Zeng Cao
    Affiliation: Hangzhou Institute of Applied Acoustics
    Country: China

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