Submitted for the DFD11 Meeting of The American Physical Society Spanwise drag variation on low Re wings-revisited SHANLING YANG, GEOFFREY SPEDDING, University of Southern California-Aerodynamic performance measurement and prediction of... more
This paper presents a study of sound absorption of slat structures. The paper stems from a need for a tool to predict the absorption coefficient for slat structures used in spaces for critical listening. For an acoustic designer, the... more
The purpose of this work is to reduce the noise generated by a compressor that conveys methane gas. After certain measurements were conducted a high level of noise was observed in the 2000-3000 Hz range, therefore a solution for noise... more
A clarifying analytical study was done for the 2-DOF acousto-mechanical system modeled as the Helmholtz resonator with elastic vibrating bottom. Generally, such a system has two resonances that can generate and radiate an annoying tonal... more
This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
La extensión de los sentidos siguió siendo una aporía no resuelta a lo
This paper was reviewed and accepted by the APCWE-IX Programme Committee for Presentation at the 9th Asia-Pacific Conference on Wind Engineering, University of Auckland, Auckland, New Zealand, held from 3-7 December 2017.
This paper presents the results of a set of wind tunnel tests carried out to examine wind-induced overall structural loads on rectangular medium-rise buildings. Emphasis was directed towards torsion and its correlation with peak shear... more
Full-scale experiments were conducted to investigate wind loading on roof tiles in hip, ridge, and perimeter locations, identified from past storms as main points of damage initiation. The objectives were to: (i) provide test-based data... more
Understanding the flow field developed in the proximity of a building due to the wind flow over it is a prerequisite for designing a building. The wind environment around buildings plays a pivotal role not only from the point of view of... more
Full-scale experiments were conducted to investigate wind loading on roof tiles in hip, ridge, and perimeter locations, identified from past storms as main points of damage initiation. The objectives were to: (i) provide test-based data... more
The acoustic effects of in-parallel resonators is compared to the behavior of a classical single degree of freedom resonator for which the resistance and the mass are in series. In-parallel resonators serve to enhance the acoustic... more
Peak bending moments are compared for a set of steel portal frames of industrial buildings in open terrain, calculated using database-assisted design (DAD) techniques and ASCE 7-05 Standard plots. The comparisons indicate that, depending... more
Coastal areas of the US are affected by extreme wind events, including hurricanes. Roofs are the most vulnerable building components as they are often damaged by high wind uplift forces acting on the edges and corners. This study... more
The acoustic effects of in-parallel resonators is compared to the behavior of a classical single degree of freedom resonator for which the resistance and the mass are in series. In-parallel resonators serve to enhance the acoustic... more
The internationally recognized procedure ISO 354:2003 for measuring sound absorption coefficients under diffuse field conditions is now under revision. The main reason for this revision is the limited reproducibility of absorption... more
This paper presents the results of a set of wind tunnel tests carried out to examine wind-induced overall structural loads on rectangular medium-rise buildings. Emphasis was directed towards torsion and its correlation with peak shear... more
Las bobinas de Helmholtz habitualmente se usan para establecer una zona de campo magnético conocido y uniforme para diversas aplicaciones. Es importante conocer la zona donde dicho campo magnético es uniforme con las distintas variables... more
The work presents the implementation in software of an adaptive method for reducing the non-uniformity of the frequency-response-curve, by covering certain walls of small rectangular rooms, with a particular type of a passive acoustical... more
En el presente informe de laboratorio se determinará la relación carga-masa (e/me) del electrón (carga específica del electrón) a partir de una configuración de bobinas de Helmholtz (que genera un campo magnético constante) y un potencial... more
Wind flow over low-rise buildings in the atmospheric boundary layer (ABL) is accompanied by some complex flow physics such as flow separation and generation of vortices in the shear layer. The uncertainties associated with such complex... more
Buildings are bluff bodies, compared to streamline objects, such as airfoil. Wind flow over buildings leads to separation and hence a complex spatial and temporal mechanism that governs the nature and intensity of aerodynamic forces. This... more
A strong wind would cause roof openings on a low-rise building and bring further structural damage. Previous related studies focused on different shapes of openings on flat roofs. Little study has been done on the sloped roofs with... more
Projects in room acoustics usually demand values of sound absorption coefficients of materials measured in diffuse field. The most widely used method for diffuse field measurement is the reverberant chamber method described by ISO 354.... more
La extensión de los sentidos siguió siendo una aporía no resuelta a lo largo de la historia de la teoría de la percepción. Un ejemplo apropiado de la persistencia histórica de esta aporía sería la disputa de prioridades entre las teorías... more
The quest for a quiet environment has led to numerous efforts to shield noise at the source or develop an efficient acoustic proof system. We present a threedimensional sonic crystal acoustic metacage structure for hybrid purposes of... more
Las bobinas de Helmholtz habitualmente se usan para establecer una zona de campo magnético conocido y uniforme para diversas aplicaciones. Es importante conocer la zona donde dicho campo magnético es uniforme con las distintas variables... more
The internationally recognized procedure ISO 354:2003 for measuring sound absorption coefficients under diffuse field conditions is now under revision. The main reason for this revision is the limited reproducibility of absorption... more
Wind hazards are one of the most disastrous events that frequently occur in the United States. Hurricane Irma, which hit the southeast coast in 2017, left a majority of damage concentrated on low-rise buildings and wooden construction in... more
The quest for a quiet environment has led to numerous efforts to shield noise at the source or develop an efficient acoustic proof system. We present a threedimensional sonic crystal acoustic metacage structure for hybrid purposes of... more
This paper presents the results of a set of wind tunnel tests carried out to examine wind-induced overall structural loads on rectangular medium-rise buildings. Emphasis was directed towards torsion and its correlation with peak shear... more
This paper presents a study of airborne noise generated by a T-slotted cylindrical aluminum hollow column with six slots of the type used for the construction of communication towers. Noise is a very distracting phenomena and an... more
Florida suffers annually from landfalling hurricanes that impose multi-hazards on coastal communities and particularly residential structures that are damaged through flooding, storm surge, and strong winds. Thus, to mitigate flooding and... more
Wind hazards are one of the most disastrous events that frequently occur in the United States. Hurricane Irma, which hit the southeast coast in 2017, left a majority of damage concentrated on low-rise buildings and wooden construction in... more
During strong wind events such as hurricanes and thunderstorms, building roofs are subjected to high wind uplift forces (suctions), which often lead to severe roofing component damage and possibly, water intrusion. It is therefore crucial... more
9 Wind tunnel testing represents an established technique for the assessment of wind-induced pressure on cladding systems. Nonetheless, some physical events, such as the pressure peaks that occur on a building’s lateral facades, are not... more
At Reynolds numbers approaching those of micro air vehicles (both engineered and natural), the Eppler 387 airfoil (in common with many other smooth profiles) can have multiple lift and drag states at a single wing-incidence angle.... more
This paper was reviewed and accepted by the APCWE-IX Programme Committee for Presentation at the 9th Asia-Pacific Conference on Wind Engineering, University of Auckland, Auckland, New Zealand, held from 3-7 December 2017.
The pressure within a building, produced by wind action, is dependent on the magnitude of external surface pressure, the size and position of all openings connecting exterior to interior of the building and the effective enclosed volume.... more
This paper presents the results of a set of wind tunnel tests carried out to examine wind-induced overall structural loads on rectangular medium-rise buildings. Emphasis was directed towards torsion and its correlation with peak shear... more
At transitional Reynolds numbers (104−105), many smooth airfoils experience laminar flow separation and possible turbulent reattachment, where the occurrence of either state is strongly influenced by small changes in the surrounding... more
In recent years, high-strength, lightweight materials have been widely used in the construction of high-rise buildings. Such structures generally have flexible, low-damping characteristics. Consequently, wind-induced oscillation greatly... more
This work is part of the analysis of master’s course results called "Room Acoustics and Glued Laminated Bamboo (BaLC): Panels tests for acoustic conditioning" which evaluated the using of BaLC, from the Dendrocalamus giganteus... more
Any use you make of these documents or images must be for research or private study purposes only, and you may not make them available to any other person. Authors control the copyright of their thesis. You will recognise the author's... more
The pressure within a building, produced by wind action, is dependent on the magnitude of external surface pressure, the size and position of all openings connecting exterior to interior of the building and the effective enclosed volume.... more