1 edition of Feasibility of a blast wave attenuation structure found in the catalog.
by Available from National Technical Information Service in Springfield, Va
Written in English
This thesis begins with an overview of bombings in the United States, followed by the introduction of the Rankine Hugoniot equations for blast wave pressure. The subsequent chapters develop the one dimensional and two dimensional Euler equations. These equations are the solved using the MacCormack finite difference algorithm. The basis of the investigation then begins by placing pole, shear plate and wedge obstacles in the path of the blast wave. The results of these simulations are interpreted and conclusions presented. Finally a synopsis of the existing results and cost analysis for structure hardening are presented.
|The Physical Object|
|Pagination||vii, 87 leaves ;|
|Number of Pages||87|
Blast wave Figure 3: Blast loads on a building If the exterior building walls are capable of resisting the blast load, the shock front penetrates through window and door openings, subjecting the floors, ceilings, walls, contents, and people to sudden pressures and fragments from shattered windows, doors, etc. Building components notCited by: Chapter 1: Seismic Wave Attenuation 1 Chapter 1 Seismic Wave Attenuation In this chapter a brief introduction on seismic wave attenuation is given. A discussion on coda waves and their properties is also included in this chapter. The back scattering model (Aki and Chouet, ) is also discussed, which is a way to model coda wave excitation.
Attenuation structure through the Earth's subsurface. Global attenuation model below has been obtained from the normal modes and surface waves displays the highest attenuation in the asthenosphere and inner core and low attenuation in the lithosphere and lower mantle (Figure 4).Global surface wave attenuation models correspond closely with shear velocity, suggesting that the temperature is the. Seismic longitudinal wave is coming from below and reaches the Earth surface, where two structures are located. The structure on the left is protected by arrays of locally resonant inclusions.
Attenuation of Radio Wave Signals Coupled Into Twelve Large Building Structures Christopher L. Holloway, William F. Young, Galen Koepke, Kate A. Remley Dennis Camell, and Yann Becquet Electromagnetics Division National Institute of Standards and . transmitted by a blast wave, as outlined in Scilly . Therefore, the term “detonation energy” will hereafter be devoted to the calculated energy of the detonation of an explosive without considering the presence of air. De- termination of the detonation energy is therefore based on prior knowledge of File Size: KB.
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The presence of a pit in all cases caused the blast wave to be attenuated; (b) for a cy- lindrical pit, a pit of a radius which effected maximum blast wave attenuation was found; (c) a useful parameter, dE,-&dt, the energy loss rate from the pit, was shown to.
In fluid dynamics, a blast wave is the increased pressure and flow resulting from the deposition of a large amount of energy in a small, very localised volume. The flow field can be approximated as a lead shock wave, followed by a self-similar subsonic flow simpler terms, a blast wave is an area of pressure expanding supersonically outward from an explosive core.
In our discussion we focus on recent schemes for shock/blast wave attenuation, characterized by the availability of reliable measurements (notably pressure and optical diagnostics) as well as high.
The blast wave attenuation coe cient is K = P oa=P c. In Fig. 2, the trajectory of the blast wave in the case of an open-air explosion (triangles), the trajectory of the blast wave for an explosion with the sand/cement attenuator (diamonds) and the trajectory of the sand front are presented.
As was expected, the velocity of the blast wave in theFile Size: KB. Wave attenuation. Our systematic literature search identified studies on coral reefs and wave attenuation. We could extract data for meta-analyses from 27 Author: Filippo Ferrario.
However, reduction of blast wave overpressure and impulse by such cylindrical bins is not sufficient (Gelfand et al, Shock Waves –, ). A reasonable alternative to endless increase of height and thickness of robust blast-inhibiting bins is a development of destructible inhibitors having no solid elements in their structure and Author: M.
Silnikov, M. Chernyshov, A. Kapralova, A. Mikhaylin, A. Pankov, V. Shishkin, A. Request PDF | Feasibility analysis of using MetaSoil scatterers on the attenuation of seismic amplification in a site with triangular hill due to SV-waves | Experimental and theoretical studies.
2 Isolated Blast Wave Propagation A knowledge of the properties of isolated blast wave propagation is useful in the understanding of interaction and coalescence of blast waves. Here we briefly summarize the similarity nature of spherical blast waves originating from point-source (massless) explosions and high pressure gas Size: 3MB.
This chapter describes the characteristics of blast-induced ground vibrations, presents the principles of reducing ground vibrations, and introduces a number of methods for reducing vibrations. The methods like wave superposition, changing initiation sequence (CIS), and dividing a single blast (DSB) into two are introduced in detail.
Attenuation of Blast Waves Using Foam and Other Materials by Richard Raspet S. Griffiths Joseph M. Powers Herman Krier Timothy D.
Panczak P. Barry Butler F. Jahani Noise is a problem everywhere the Army trains or tests with large weapons or helicopters. The Army Environmental Office and the Secretary of the Army have listed noli andCited by: 4.
The binding structure of a deposited mud bed becomes stronger and stronger with the increase of consolidation (i.e., mud density), and thus, harder and harder to be broken under the action of waves.
This also implies that the wave attenuation rate is low for a. one dimensional, linear blast wave. The volume of the blast wave produced by the shock tube assumes unit depth and unit height; thus, the volume of the blast wave inside the shock tube grows at a rate equal to the radius from the blast wave source.
A ﬁxed area shock tube produces a blast wave with a constant cross sectional : Michael G. Phillips. EVALUATION OF OVERPRESSURE WAVE TRANSITION BY AIRBLAST OVERPRESSURE AND SHOCK WAVE ATTENUATION ANALYSIS USING A SMALL BLACK POWDER CHARGE.
Abstract. Eight flush mount pressure sensors were used in a series of 3 test sequences to measure air overpressure produced by a firecracker. Overpressure was recorded at a. The propagation and attenuation of blast waves through porous layers is one of the important research topics related to safety assessment and prevention from explosion hazards.
This study is a part of series of research on shock in complex by: 7. The blast wave is also characterized by its positive impulse i s, which is related to the total force (per unit area) applied on a structure due to an explosion, calculated through the integration of the pressure–time curve described in equation (1)Cited by: Blast wave propagation in city streets}an overview Peter D Smith and Timothy A Rose Cranfield University, Shrivenham, SN6 8LA, UK Summary This paper presents an overview of research conducted by the authors and others both experimentally and analytically in the area of blast wave interactions with buildings and structures in an urban by: 1 the blast wave slows down to Lorentz factor 2; it radiates at frequency with spectral luminosityu/u 0 \1, L/L 0 \1.
Our analysis is restricted to the ultrarelativistic stage, that is,todimensionlessobservedtimest o >1. LIGHT CURVES We —rst calculate in ° synchrotron emission of the blast wave neglecting radiative cooling of. The interested reader should consult NIST Report GCR Soil-Structure Interaction for Building Structures for additional information.
While design for both blast and seismic is performed with the intent of protecting people and assets, the focus of each design effort is quite different.
After an explosion occurs in a tunnel, the blast waves take on diverse forms of attenuation in different regions when it propagates along the tunnel. However, the prediction of the overpressure decay laws proposed in previous studies has not taken into account the influence of the different regions in the tunnel.
The present paper uses the example of the Micangshan highway tunnel in China and Author: Yong Fang, Yi-Lun Zou, Jian Zhou, Zhi-gang Yao, Shuai Lei, Wenbo Yang. The complex structure of the light curves of Swift GRBs has made their interpretation and that of the blast wave caused by the burst, more difﬁcult than in the pre-Swift era.
We aim to constrain the blast wave parameters: electron energy distribution, p, density proﬁle of the circumburst medium, k, and the continued energy injection index, : P. Curran, A. van der Horst, R. Starling, R.
Wijers. wave are adopted, but seldom are the blast wave. Therefore in this research, silencer models with basic expan-sion configurations are adopted without and with the acoustic material such as glass wool to evaluate the pres-sure decay of blast waves quantitatively, using the blast wave generation mechanism in a shock tube  .
As.Propagation and attenuation characteristics of various ground vibrations Dong-Soo Kima,*, Jin-Sun Lee1,a aDepartment of Civil Engineering, Korea Advanced Institute of Science and Technology, Taejon,South Korea Accepted 27 December Abstract In order to effectively control vibration related problems, the development of a reliable vibration monitoring system and the proper.The Physics and Mechanisms of Blast Fig.
A large conventional explosion is shown from a the fireball, the blast wave appears as a sharpline, which is caused by refraction of light by the higher-density gas at the shock front. Source: D. R. Richmond three quantities are manifestations of the underlying motion of the molecules, they are related another.