A Passive Vibroacoustic Attenuation Device (PVAD) is an integrated structural vibration mitigation device and acoustic damper. The PVAD was developed to provide low frequency noise reduction where acoustic blankets display limited effectiveness. This work presents modeling of the PVAD and composite cylinder test bed, simulations, experimental results using prototype PVADs on a 2.75-meter composite cylinder. The measured experimental data supported conclusions from the model simulations and predictions. Narrow-band reductions of 10 dB were demonstrated at low frequency acoustic resonances. More than 4 dB RMS acoustic reduction was measured over the frequency range below 160 Hz where the treatment was designed to target.
展开▼
