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Full-Text Articles in Architecture
Comparison Of Radiated Power From Structurally Different Violins, Lily M. Wang, Courtney B. Burroughs
Comparison Of Radiated Power From Structurally Different Violins, Lily M. Wang, Courtney B. Burroughs
Durham School of Architectural Engineering and Construction: Faculty Publications
The acoustic power has been determined from intensity measurements on three structurally different violins: a Scherl and Roth student violin, Hutchins' SUS29S, and Hutchins' mezzo violin SUS 100. While each violin was bowed with an open-frame mechanical bowing machine, the intensity measurements were made by scanning each side of the bowing machine with an intensity probe. One-third octave band sound power levels of the acoustic radiation from each of the three instruments as each of the four open strings is bowed show that the structurally different mezzo violin produces greater power at low frequencies when the lowest (G) string is …
Finite Element Assessment Of The Effects Of Seismic Loading Rate On Soil Liquefaction, Radu Popescu
Finite Element Assessment Of The Effects Of Seismic Loading Rate On Soil Liquefaction, Radu Popescu
Architectural Engineering
The influence of frequency content of seismic excitation on the extent and pattern of pore-water pressure build-up in saturated soil deposits is addressed. Seismic acceleration time histories are generated as uniformly modulated nonstationary stochastic processes, in accordance with prescribed response spectra and prescribed modulating functions. Based on numerical examples, it is shown that the interplay between the frequency content of seismic excitation and the dynamic characteristics of the soil system and their evolution during and after the earthquake have important implications on the dynamic response.Key words: seismic motion, frequency content, finite elements, soil dynamics.
Biological Fixed Film Systems, Mark W. Fitch, Ellen England
Biological Fixed Film Systems, Mark W. Fitch, Ellen England
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
No abstract provided.
Variable Speed Drive (Vsd) Applications In Dual-Duct Constant Volume Systems, Ik-Seong Joo, Mingsheng Liu, Kirk Conger, Gang Wang
Variable Speed Drive (Vsd) Applications In Dual-Duct Constant Volume Systems, Ik-Seong Joo, Mingsheng Liu, Kirk Conger, Gang Wang
Durham School of Architectural Engineering and Construction: Faculty Publications
Models have been developed for static pressure and potential supply fan energy savings by using variable speed drive (VSD) in dual-duct constant volume systems. Experiments have been performed using a full size dual-duct constant volume system installed in a 68,000 ft2 (6,317 m2) office and classroom building. The measured static pressure variations and the energy savings agree with the model projected values. The VSD saves the fan power by as much as 35%, reduces the total airflow by 15%, and decreases the excessive static pressure on the terminal box dampers. This paper presents the systems models, the …