Experimental and numerical investigation of saltwater. This thesis presents experimental and numerical studies on rc slabs, columns, and walls subjected to contact explosion effects and parametric studies to understand the response mechanism in order to recommend costeffective mitigation strategies. Boren blvd, norman, ok 73072, usa summary results are presented from a series of analytical and numerical studies of. This paper presents the results of experimental and numerical investigations that. An experimental and numerical study of blast induced shock wave mitigation in. Experimental and numerical modeling of three dimensional natural convection in an enclosure massachusetts institute of technology. Numerical and experimental investigation of the stability. The experimental study revealed that steel encased braces provide stable hysteretic behavior and can be an alternative to mortar filled steel tubes. Verification of numerical procedures for the analysis of soil liquefaction problems. Giusti, a and worth, na and mastorakos, e and dowling, ap 2016 experimental and numerical investigation into the propagation of entropy waves. The prediction of the acoustic behavior applies material models, among which most are based on the biotparameters. Subsequently, experimental studies on the asym nes designed for a small. While these types of experiments are useful in understanding general blast wave phenomena, they are not likely to be directly applicable towards personal protection from shock waves.
Indian geotechnical journal is published by the indian geotechnical society in association with springer india. Axialfuelstaged combustion is a promising technology to reduce no x emission at high turbine inlet temperatures and provide extended gas turbine operational flexibility. The effectiveness is evaluated by calculating the frequency response function frf and the vibration acceleration peak vap in both time and frequency domains. Such methods may include a step of applying a location clustering model to a test set of contigs to form two or more location cluster groups, each location cluster group comprising one or more locationclustered contigs. Mitigation of vapour cloud explosions by inhibition phd draft p hoorelbeke page 2 2. Purdue university, school of civil engineering, west lafayette, in, 47907. Springer new york heidelberg dordrecht london, 2014. Isbn 9781461472667, isbn 9781461472674 ebook, doi 10.
The present study proposes a joint experimental and numerical approach to monitor snow deposits around snow fences, quantitatively estimate snow deposits in the field, asses the efficiency and improve the design of snow fences. Two experimental facilities located at the delft university of technology were used for that purpose. Experimental and numerical investigation of the ground shock. Then, a sliding mode control method is employed to suppress stickslip vibration. Numerical and experimental analysis of the effect of rigid. Experimental and numerical studies on vertical properties of a new multidimensional earthquake isolation and mitigation device zhaodong xu, 1 liheng lu, 1 benqiang shi, 2 and fuhgwo yuan 3 1 key laboratory of concrete and prestressed concrete structures of the ministry of education, southeast university, nanjing, jiangsu, china. Viscoelastic dampers are one of the most popular earthquake mitigation devices for building structures with a large number of applications in civil engineering. For the purposes of this study, a wind tunnel experiment and a numerical analysis during ebb and high tides were conducted to determine the positive and negative effects of wind flow influenced by a seawall structure on the performance of wind turbines installed along a coastal seawall. Experimental and numerical evaluation of spontaneous. Full field blast experiments were performed to assess the potential of fluid filled.
Experimental and numerical studies on vertical properties of a new multidimensional earthquake isolation and mitigation device article type. The latest versions of adobe reader do not support viewing pdf files. Probability and statistics for engineering and the. Extensive research has been conducted to reduce the damage potential of blast waves. The study commences with a detailed working principle of the asym nes, and the equations of motion of an asym nes. Density and acoustic impedance mismatch are shown to be of primary importance while porosity is. Jahra fatima1, hiroyuki yamamoto2, fumiaki hasegawa3 and. Numerical and experimental study of mitigation of welding. This paper presents the results of recent ground shock experiments conducted by the u. School of meteorology, university of oklahoma, 120 david l. The comparison of the wind flow field between a wind tunnel experiment performed with a 1100 scale model. The application of porous materials is a common measure for noise mitigation and in room acoustics. The roll mitigation due to art is demonstrated through experimental tests and numerical calculations. Experimental and numerical investigation of sandwich structures.
Numerical study of water mitigation effects on blast wave. Both the numerical model and the experimental results were consistent in showing that most materials attenuate the peak blast pressure while aerogel actually enhances the blast. Soil improvement with stone columns is often implemented in seismic areas in particular as a countermeasure against liquefaction. In this paper, we analyse the mitigation effects of open trenches on the vibrations induced by subway trains.
An experimental and numerical study of blast induced shock wave mitigation in sandwich structures. Verification of numerical procedures for the analysis of soil. Current experimental and numerical issues in masonry research paulo b. Experimental and numerical studies on vertical properties. Research article experimental and numerical investigation of. Damage curve determination of dualphase steel based on. The concept of incorporating fluid within channels in helmets is not new. The research results at the age of 7 days showed that nanotio 2 paste was denser and more compact than that without nanotio 2. The authors present the most uptodate understanding from laboratory studies and computational analysis for researchers working in the field of blast loadings and their effect on material and structural failure. Recent tunnelling and underground space technology. An experimental, numerical and analytical investigation of. Experimental and numerical studies on vertical properties of a new multidimensional earthquake isolation of structures, while fewer devices are proposed to reduce the horizontal and vertical earthquake responses of structures simultaneously. The results showed that although the flame continued, the cooling effects by. Clement 2012, experimental and numerical investigation of saltwater intrusion dynamics in.
Each experiment, with a given mix and specimen size, was carried out 6 times, and the experimental results shown here in fig. The experimental results of previous studies have revealed the relationship between the residual material properties and the parameters measured by a linear ultrasonic method yang et al. Research article experimental and numerical investigation of the ground shock coupling factor for nearsurface detonations timothyw. Experiments were performed to investigate heating up processes of fluids in storage tanks under the influence of an external heat source. Moreover, the performance of the asym nes is compared with a tuned mass damper tmd and a cubic nes under impulsive excitations. A historical evolution of the first realisations is presented, followed by an.
Experimental and numerical investigation of one and two phase. Initial work used idealised equations of state for generic mitigants but more recently material characterisation experiments have been undertaken at rmcs. Accepted manuscript experimental and numerical investigation of bladetower interaction noise branko zajamseka, yendrew yauwenasb, con j. Citescore values are based on citation counts in a given year e. Experimental and numerical investigation into the propagation. Different convection coefficients have been used for modeling the convection conditions at the top and bottom surfaces. Experimental and numerical analysis of the failure of notched.
In recent years, society has become more aware and concerned with the environmental and human health impacts of population growth and development. Analytical and numerical studies of natural convection along doubly infinite vertical plates in stratified fluids alan shapiro, evgeni fedorovich, jr. Experimental and numerical studies english 20 isbn. The mitigating effect of a water wall on the generation and propagation of blast waves of a nearby explosive has been investigated using a numerical approach. Djakov institute of electronics, bulgarian academy of sciences, 72 tsarigradsko chaussee, 1784 sofia, bulgaria. Pdf numerical study of blast mitigation performance of. An experimental and numerical study of blast induced shock wave. The damage extent and influence of a blast are dependent on the energy. Hansena, victoria, timchenko b, john, reizes, colin h. This study combined field experiments and numerical simulations to investigate the ability of green roofs to absorb rainwater. Unlike static pdf probability and statistics for engineering and the sciences solution manuals or printed answer keys, our experts show you how to solve each problem stepbystep. Thus, making live explosive testing outside the capability of many researchers.
In this paper, we present the results of an experiment aiming to compare measurements of atmospheric delay by synthetic aperture radar sar interferometry and gps techniques to estimates by numerical weather prediction. Good agreement on the peak and average stress between numerical results. Hafizi and others published experimental and numerical investigation of vshape plates subjected to blast loadings find, read and cite all the research you need on. Jul 25, 2017 establishing a predictive method for blast induced masonry debris distribution using experimental and numerical methods. To that end a series of shock experiments on various sandwich panels via shock. In research 7 conducted an experimental study on mortar by adding tio 2 nanoparticles of 0. The study is performed by using both physical model tests and numerical simulations. Computational methods used for large scale scaffolding of a genome assembly are provided. Experimental study of the urban microclimate mitigation. Numerical and experimental investigation of flow and scour around a circular pile volume 534 andreas roulund, b. This thesis presents an experimental and numerical investigation undertaken in order to develop the understanding of the behaviour of orthogonal 3d woven composites under quasistatic tensioncompression, outofplane bending and dynamic soft and multihit ballistic impact load cases. Seismic waves created during explosions are transmitted in an outward direction via the surrounding medium, creating a seismic effect that compromises the security of facilities. Numerical modeling and experimental investigation of the. Army engineer research and development center to further investigate the adequacy of the coupling factor approach to shallowburied or nearsurface detonations.
Ios press is an international science, technical and medical publisher of highquality books for academics, scientists, and professionals in all fields. Download this popular ebook and read the blast mitigation. A new kind of multidimensional earthquake isolation and mitigation device was recently developed, and experimental study on vertical performances of the device under. Received 24 october 2016, revised 25 june 2017, accepted 5 july 2017, available online 19 july 2017.
Experimental and numerical studies of a novel asymmetric nonlinear. Develop experimental strategies to test the mitigation potential of different materials. Nevertheless, an estimation of the biotparameters from the geometric design of. Comparisons between these recent experimental results and results of numerical simulations of the ground shock propagation in soil are presented. The present paper addresses the theoretical and experimental studies of the viscoelastic. The seismic performance of viscoelastic dampers is greatly affected by viscoelastic materials. Project funded by the vermont agency of transportation and uvm transportation. Kinoshita2 1graduate school of science and engineering, ehime university, matsuyama, japan 2department of civil and environmental engineering, ehime university, matsuyama, japan. Presents experimental methods of material and structural response to dynamic blast loads includes computational.
In case of formability of a sheet material, due to complex damage condition of dualphase sheets, the initiation of micro crack based on the ductile crack initiation locus dcil have. Physical parameters of the experimental rig are identified in order to calibrate the mathematical model and consequently to ensure robust predictions and a close agreement between experimental and numerical results for stickslip vibration is shown. Experimental study on the atmospheric delay based on gps, sar interferometry, and numerical weather model data abstract. To investigate the emissions characteristics of the axialfuelstaged combustion, a staged model combustor was constructed and a parametric study was performed at atmospheric pressure. The main objective of the present work is to study the effect of material properties on the. Experimental and numerical stability investigations on. In the second phase a numerical study was conducted to study the friction problem in brbs.
Experimental and numerical study on dynamic response of vshaped hull. Polymer materials are increasingly used in engineering solutions. An experimental and numerical study on laminar flame characteristics of methane oxyfuel mixtures highly diluted with co2 was conducted using a constant volume chamber and chemkin package. The experimental data set was used for calibrating numerical finiteelement models for use in predicting pressurewave propagation. Numerical methods qualification exam problems and solutions university of marylandjanuary 2008 from wikibooks, open books for an open world wikibooks, open books for an open world experimental data set was used for calibrating numerical finiteelement models for use in predicting pressurewave propagation. Pdf experimental and numerical investigation of vshape. Verification of blast demolition problems using numerical and experimental approaches daigoro isobe1, masashi eguchi2, kensuke imanishi2 and zion sasaki 2 abstract one of the objectives of this study is to perform some blast demolition analyses of framed. Experimental, numerical and analytical modelling of a newly. Experimental and numerical investigation of preferential flow.
Several tests were performed both with heating from the bottom and. Numerical and experimental study of vapor cloud explosions. The actual combustion of woods were compared with the numerical simulations. The energy released during explosions forms dynamic pressure, which creates gas pressureinduced blast waves that cause the ground to vibrate. Clarke bachelor of science in physics university of nevada las vegas 2009 bachelor of science in mathematics university of nevada las vegas 2009 a thesis submitted in partial fulfillment of the requirements for the. Experimental and numerical studies covers both experimental and numerical aspects of material and structural response to dynamic.
Research on vapour cloud explosions involves multiple scientific fields such as chemistry, physics, turbulences, combustions and numerical modelling. Theoretical and experimental study of viscoelastic damper. Numerical simulations were run to reproduce the experimental setting and history match f. Deformation and collapse of orthogonal 3d woven composites. An experimental and numerical study of blast induced shock. Experimental study on the atmospheric delay based on gps. Experimental and numerical investigation of bladetower. The laminar burning velocities of ch4co2o2 mixtures decrease. Introduction numerical and experimental studies of structures loaded by a. The objective of this dissertation is to develop design guidelines and methodologies for protectivehardening strategies used to mitigate blast hazards in reinforced concrete and concrete masonry walls. Experimental and numerical analysis of a seawalls effect. Experimental and numerical studies arun shukla, yapa d. The successful application of slit dams for debris flow mitigation has been claimed in sev eral experimental and numerical studies 3,511. Experimental and numerical study of subgrade soil migration into pavement subbase and mitigation using geotextile.
Numerical results show that the proposed asym nes is as effective as the in. Fem, numerical analysis, crack propagation, abaqus, abs patryk rozylo, lukasz wojcik comparison of numerical and experimental analysis of the crack propagation process abstract nowadays numerical methods are a powerful tool to simulate real processes. The numerical method and the computational setup are rst presented followed by a alidationv of the method and comparisons with experimental results. Experimental and numerical analysis of the cooling. Experimental, numerical and analytical modelling of a newly developed rockfall protective cablenet structure s.
Experimental and numerical modeling of three dimensional. Microclimate mitigation potential of green wall a and green roof b. Figure 1 is a schematic diagram of the experimental setup. Loads generated in explosions that result from terrorist attacks and industrial accidents create devastating hazards for buildings and their occupants. The numerical study suggests that the deposition of the subgrade soil into subbase is governed by hydraulic condition, grain size of subgrade, grain size and pore size of. Experimental and numerical investigations on nitrogen species. T1, j, k n t 1, j, k n along the other three boundaries and on the top and bottom surfaces of the plate, heat dissipation will occur through convection. Blast mitigation experimental and numerical studies arun shukla. A multimaterial eulerian finite element technique is used to study the influence of the design parameters, such as the watertoexplosive weight ratio, the water wall thickness, the airgap and the cover area ratio of water on the. Experimental and numerical investigation of a 60cm diameter bladeless fan article pdf available in journal of applied fluid mechanics 92.
Foamprotected reinforced concrete structures under impact. The numerical and analytical solutions are indistinguishable for the parameters used in these tests and therefore only the analytical solutions are plotted. Experimental and numerical investigation of the refinement of hf by ebm. Design, experimental and numerical characterization of 3d. Analysis of blasting vibration wave propagation based on. A preliminary numerical parameter study has been undertaken by fge using two. Experimental and numerical studies covers both experimental and numerical aspects of material and structural response to dynamic blast loads and its mitigation. A single cube strip model is numerically simulated and calibrated with the experimental results from the previous studies. Experimental and numerical studies on wrinkling control of an in. Experimental investigation on nanomaterial concrete.
No need to wait for office hours or assignments to be graded to find out where you took a wrong turn. Fouling mitigation in crossflow filtration using chaotic. To date, only a handful of multidimensional earthquake isolation or earthquake mitigation. The effects of high co2 dilution on combustion chemical reaction, flame instability, and flame radiation of ch4co2o2 mixtures were studied. Pdf experimental and numerical investigation of a 60cm. This study discussed the cooling effect of water spray systems in experimental and numerical analyses. Biological engineering, institute of chemical processes, seoul national university, seoul 08826, republic of korea. Proceedings of the sixth international conference on physical modelling in geotechnics 2 pp.
Both the numerical model and the experimental results were consistent in. The efficiency of stone columns can be explained by the compaction effect during their execution, by the reduction of the seismic stress on the soil, and by their draining effect as well. Lourenco associate professor universidade do minho guimaraes portugal abstract the paper addresses the possibilities and research needs with respect to advanced testing and numerical analysis of masonry structures, with a focus in cyclic behaviour. We constructed a simple fracture network made by plexiglas for physical experiment studies. Counter rotating vg configuration the present work is divided into numerical and experimental sections. A finite difference numerical model is described which is used to investigate the time to reach steady state and the longterm transient response of the experimental system. A series of tests are reported which used existing pressure cell apparatus to measure nitrogen gas flow in concrete. Experimental study on the emissions characteristics of a.
Investigation and prediction of pollution in coastal and. Experimental and numerical analysis of the failure of notched concrete beams. Request pdf experimental and numerical studies of a novel asymmetric nonlinear mass damper for seismic response mitigation this paper proposes a novel passive mass damper, namely, asymmetric. As a consequence of an external fire, the heatup of the inventory may lead to the evaporation of the liquid and to release of significant quantities of dangerous gases into the environment. Most experimental work on blast mitigation has been done with kilogramscales of explosives with direct contact between the explosive and the mitigating material. This was done to take into account the effect of higher temperature. Numerical methods qualification exam problems and solutions. Numerical and experimental investigation of the stability region for a cylindrical ion trap by bradley s. Numerical and experimental studies of arching effects within. Experimental investigation of a novel blast wave mitigation device 1. Snow deposit profiles were mapped using gps based real time kinematic surveys rtk conducted at the m onitored. Blast protection of infrastructure with fluid filled. We use a combination of laboratory and numerical experiments to test this hypothesis and use the resulting data set to explain the reason for the difference in intrusion rates.
Hansenc acollege of science and engineering, flinders university, adelaide 5042, australia bschool of mechanical and manufacturing engineering, university of new south wales. Experimental and numerical studies on wrinkling control of. Experimental and numerical studies of a novel asymmetric. The second objective of this paper is to propose two methodologies taking into account in a. This paper primarily focuses on the type of bombing observed in volgograd by presenting reducedscale experiments on the effect of rigid barriers on blast wave propagation in the confined space of a railway station. Very good agreement has been achieved between the experimental results and the numerical model results.
First, the airfoil of interest, a naca 4414, was selected. Establishing a predictive method for blast induced masonry. Introduction a blast wave produced by an explosive can be very damaging to military personnel and structures. Section iii is devoted to the numerical investigation.
Pdf an experimental and numerical study of blast induced. Experimental and numerical study on dynamic response of v. Experimental data were systematically compared in 67 to numerical simulations based on the twophase baer and nunziato model 62 and found that the mitigation of the real blast is largely. In response, a number of legislative measures have been introduced within europe and globally, which have sparked much crossdisciplinary research aimed at predicting and quantifying these impacts, and suggesting mitigation measures. Blast mitigation experimental and numerical studies. Experimental study of blast mitigation by foamed concrete xinbang. Initial work used idealised equations of state for generic mitigants but more recently material characterisation experiments have been undertaken at.
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