Vibroacoustic control of fluid-filled pipes with add-on acoustic black holes

The propagation of noise and vibrations in hydraulic systems is a critical issue across numerous industrial sectors, including building services, energy, and aerospace. Noise sources are primarily linked to hydraulic pumps generating pressure pulsations in the circuit.
Structural vibrations can lead to mechanical fatigue, particularly at pipe junctions, with potentially serious consequences for the operation and safety of hydraulic installations. Furthermore, acoustic waves propagating inside the pipe can be a source of noise disturbance, especially in building-related applications. Developing effective devices to control the propagation of vibrations and acoustic waves in pipes is therefore of primary importance.

The Acoustic Black Hole (ABH) concept appears as a promising approach in this context. It has been investigated in laboratory settings by various research groups over the past decade. Through specific geometric design, the ABH aims to slow down wave propagation and concentrate energy in a specific zone where it can be dissipated as heat through thermoviscous or viscoelastic effects.

More information on the link below.