Numerical analysis of vibroacoustic beamforming gains for acoustic source detection inside a pipe conveying turbulent flow

This study concerns a monitoring technique based on vibration measurements for identifying the presence of an acoustic source in fluid-filled pipe conveying turbulent flow. In such situation, source-induced vibrations can be smeared with flow-induced vibrations, which hinders detection. To increase signal-to-noise ratio (SNR), beamforming techniques applied to measured by array accelerometers mounted pipe. However, current problem is more complex and challenging than most typical applications due strong fluid–structure coupling resonant modes internal flow excitations. Numerical vibroacoustic methods are presented predict vibratory response excited monopole and/or boundary layer (TBL). The cross-spectral matrices computed radial accelerations induced detected TBL used assessing performance two techniques. gains using both, conventional MaxSNR approaches estimated. Results indicate superior MaxSNR, leads significantly higher gain.