Georgia Institute of Technology researchers have developed a way to stop brakes from squealing. High-pitch brake squeals annoy drivers of every type of vehicle, from big buses and trucks to mini cars. The squeals are rarely more than a cosmetic annoyance, but most drivers detest the unwanted sound. Unlike feedback control systems that some brake makers use to detect noise and generate vibrations to counter squeal frequency, the Georgia Tech acoustics engineers use piezo-ceramic actuator ...

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