An active sound control system comprises microphones to measure incoming sound, loudspeakers to produce anti-sound and digital control to predict the correct cancelling signals. In practice the signal processing is normally adaptive, to compensate for varying or unknown system properties.
You will build on a 2017 project that developed a rig to cloak sound in 1-dimension. The rig comprises a long duct in which can be mounted arrays of loudspeakers and microphones. You will perform modelling and numerical simulations, and implement adaptive control experimentally using Compact RIO hardware and Labview.
There are two possible, similar applications. The first involves acoustic cloaking: surrounding a body with loudspeakers and microphones so that it becomes acoustically invisible, or “cloaked” (e.g. Starship Enterprise, but in terms of sound rather than light). The second concerns active noise control, in which unwanted noise propagating along the duct (e.g. from air conditioning) is cancelled before it can escape to the surroundings.
Undergraduate
A 1-dimensional system with adaptive active control implemented in simulation and experiment. Application to either acoustic cloaking or active noise control. If you can get 10-20dB reduction over a broad range of frequency it would be excellent.
None
Mechatronics PG + Dynamics and Control Lab (201.562, Lab)