Open Access. Powered by Scholars. Published by Universities.®
- Institution
- Keyword
- Publication
- Publication Type
Articles 1 - 3 of 3
Full-Text Articles in Other Engineering
Bus On Shoulder: Local Assessment Of Shoulder Transit Lane For Regional Buses In San Luis Obispo County, Jessica R. Berry
Bus On Shoulder: Local Assessment Of Shoulder Transit Lane For Regional Buses In San Luis Obispo County, Jessica R. Berry
Master's Theses
The study looks at the applicability of integrating a Bus Only Shoulder (BOS) into the intermittently congested segment of US 101 in southern San Luis Obispo County. Policy, infrastructure and implementing criteria derived from case studies in Minnesota, Florida and California (San Diego) and the 2007 California Decision Document on BOS are applied to conditions in the region. One measure of performance, time savings, is projected to 2025 to determine the value of integrating the program by that horizon year. Given the substantial potential for time savings in that future year, recommendations are made to create the appropriate policy and …
Active Noise Barrier Minimizing Pressure Gradient, Carl Hart, Siu-Kit Lau
Active Noise Barrier Minimizing Pressure Gradient, Carl Hart, Siu-Kit Lau
Durham School of Architectural Engineering and Construction: 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
Noise Propagation Through Open Windows Of Finite Depth Into An Enclosure, Caleb Sieck, Siu-Kit Lau
Durham School of Architectural Engineering and Construction: 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 …