Open Access. Powered by Scholars. Published by Universities.®

Other Engineering Commons

Open Access. Powered by Scholars. Published by Universities.®

Construction Engineering

2010

Articles 1 - 2 of 2

Full-Text Articles in Other Engineering

Active Noise Barrier Minimizing Pressure Gradient, Carl Hart, Siu-Kit Lau Jan 2010

Active Noise Barrier Minimizing Pressure Gradient, Carl Hart, Siu-Kit Lau

Architectural Engineering -- Faculty Publications

Minimization of the sound pressure field within the shadow zone of a noise barrier is achieved by reducing the pressure gradient along a line, at the top of a barrier, via active noise control. The noise control effectiveness of a barrier is increased by this strategy, especially for specific system configurations. The proposed method was evaluated by numerical simulation. Results indicate that system orientation has little effect on minimizing the pressure gradient at the top of the barrier when the error sensors are invisible to the primary noise disturbance. Highly effective control within the shadow zone and close to the ...


Noise Propagation Through Open Windows Of Finite Depth Into An Enclosure, Caleb Sieck, Siu-Kit Lau Jan 2010

Noise Propagation Through Open Windows Of Finite Depth Into An Enclosure, Caleb Sieck, Siu-Kit Lau

Architectural Engineering -- Faculty Publications

Predicting the insertion loss of an opening backed with an enclosed space is important for building noise control. Recent research in sound transmission through apertures of finite depth in infinite rigid baffles has included the effects of propagating and evanescent modes within the aperture in order to extend models to higher frequencies. The present study extends the model to the case of the aperture backed by a cavity as opposed to sound radiating into half-space. The role of coupling between the aperture modes, radiation modes, and cavity modes in the transmission was investigated. The results were compared to those of ...