Black Hole Grown In A Lab Traps Sound Waves In Wild Physics Experiment
By adapting cosmic black hole physics, acoustic engineers have created a device that swallows sound inside pipes to eliminate unwanted acoustic energy such as echoes and vibrations.
When sound travels through enclosed ducts, ventilation, or plumbing systems, encountering obstructions normally creates jarring echoes. A research team led by engineer Deng Jie and acoustics engineer Oriol Guasch at La Salle, Universitat Ramon Llull in Spain developed a 3D-printed plug-in sonic black hole (SBH) that negates those reflections by progressively slowing sound waves down as they move through the pipe until their acoustic energy is absorbed as heat.
"Imagine standing in front of a duct that is closed at the far end and shouting into it," Guasch told Science Alert. "After a short delay, depending on the length of the duct, you would hear an echo coming back from the termination. If the duct were terminated with a sonic black hole,...
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