Download or read book Performance and Predictions for a Large Blast Simulator Model written by D. M. Hisley and published by . This book was released on 1985 with total page 65 pages. Available in PDF, EPUB and Kindle. Book excerpt: An attempt is made to verify the predictions from a l-D BRL Code against the flow from a complicated, non-straight shock tube configuration; the code then could be utilized for future Large Blast/Thermal Simulator (LB/TS) design and prediction of performance, The shock tube is a 1/37 scale, axisymmetric model following the design for a multi-driver large blast simulator (LBS) located at Centre d'Etude, Gramat, France. It is used to produce shock pressures from 3.1 to 31 psi (21 to 214 kPa) and characteristic decaying wave forms. The BRL code is a quasi-one-dimensional, adiabatic, inviscid, Eulerian computer algorithm. The code is described and some preliminary checks against related configurations are performed. Furthermore, the code uses the experimental tube geometry and run conditions to generate flow data for comparison with the experimental data. Additionally, parameter studies are done-necking down of nozzle throat at the diaphragm station, heating of the driver gas, temperature effect on driver due to pressurizing--to check their influence on the tube behavior. In general, computed blast wave forms as well as levels agree well with experiment except for the highest levels where head losses and real gas effects are more pronounced. With the natural-burst-of-diaphragm operation of tube, diaphragm blockage of the nozzle throat is a problem; temperature effects due to pressurizing of driver are not.
Download or read book Performance Predictions for the Large Blast Thermal Simulator Based on Experimental and Computational Results written by and published by . This book was released on 1991 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: A computational study was performed with the BRL-Q1D code to determine the expected performance characteristics fo the proposed U.S. Large Blast/Thermal Simulator (LB/TS). This computational study complements an earlier experimental parametric study which was performed in the 25.4-cm shock tube located at the BRL. For the experiments, the BRL 25.4-cm shock tube was configured as a 1:57 scale, axisymmetric, single-driver model of the LB/TS. This report documents two computational parametric studies which were performed to determine the range of nuclear blast simulations available with the current LB/ TS design. The first parametric study s a comparison with existing experimental data to validate the computational model and to determine the limits of its accuracy. The second parametric study used the validated computational model to predict the operating range of the LB/TS design.
Download or read book The Shock and Vibration Digest written by and published by . This book was released on 1986 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Feasibility Study for a Large Blast Simulator written by A. H. Wiedermann and published by . This book was released on 1964 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: The object of this research program is to determine the most feasible means of obtaining a nuclear blast simulator which will reproduce the transient flow field associated with the 500 psig. overpressure range of large nuclear weapon detonations. The blast simulator is of the general purpose type and is characterized by a traveling shock wave followed by a flowing gas. A large number of potential blast simulator concepts were evaluated and their performance char acteristics were determined. Preliminary designs were made for those concepts which possessed the best over-all performance characteristics and estimates of their economic feasibility were established. Volume II consists of several appendices that are referenced in Vol. I, which give the details of the feasibility study analysis. (Author).
Download or read book Technical Reports Awareness Circular TRAC written by and published by . This book was released on 1989-07 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Computers in Engineering written by and published by . This book was released on 1993 with total page 808 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Blast Parametric Study Using a 1 57 Scale Single Driver Model of a Large Blast Simulator written by George A. Coulter and published by . This book was released on 1987 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt: A 1:57 scale, single cold air driver model of a large blast simulator was constructed and operated in driver overpressure range of 300-1800 kPa. Recorded overpressures were in a 10-225 kPa range for the given driver pressures. Blast parameters of overpressure, positive impulse, cold gas arrival and drag enhancement, and recompression fan arrival were measured at stations 7-28 diameters along the test section of the simulator model. The cold gas arrival at the test stations was found to enhance the dynamic drag pressure by a factor of two at the 220 kPa input level. Similar, although larger enhancement was predicted by the BRL-Q1D Code simulation. Effects of driver length, volume, and throat baffle ratio for the full-size simulator operating range are presented in tabular and graphical form. Because of the large cold gas dynamics drag enhancement at test section pressures above 100 kPa, it is recommended that a hot gas driver be used for the full-size simulator. Due to the side-on overpressure positive duration decrease caused by arrival of the throat nozzle recompression fan, a station at 20 test section diameters should be used for the full-scale simulator. (Author).
Download or read book Performance Predictions for the ARL Enhanced 2 44 m Blast Simulator written by Audrey Mihalcin and published by . This book was released on 1996 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modeling Thermal Environments in Large Blast thermal Simulator LB TS written by Burton S. Chambers and published by . This book was released on 1986 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Computers in Engineering 1993 written by Fatih Kinoglu and published by . This book was released on 1993 with total page 798 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book Feasibility Study for a Large Blast Simulator written by A. H. Wiedermann and published by . This book was released on 1964 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book BLAST Simulator Project written by and published by . This book was released on 2014 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Blast Simulator project involves the development of an apparatus able to reproduce the effects of a blast pressure wave on large scale structural components (such as columns, walls, etc.) with the objective to improve their strength in these severe loading situations. This technical report presents the setting up and the performance assessment of the prototype blast actuator developed at the JRC. The first preliminary tests performed have been described and evaluated. Satisfactory results have been obtained with respect to impacting masses and velocities and with the finally obtained pressure values.
Download or read book Computers in Engineering 1989 Knowledge based systems computer aided engineering design optimization computer simulation of mechanical systems computer graphics robotics specialty process controls and data acquisition systems written by and published by . This book was released on 1989 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modeling And Simulation In Science Proceedings Of The 6th International Workshop On Data Analysis In Astronomy Livio Scarsi written by Giosue Lo Bosco and published by World Scientific. This book was released on 2007-12-13 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: This proceedings volume contains results presented at the Sixth International Workshop on Data Analysis in Astronomy — “Modeling and Simulation in Science” held on April 15-22, 2007, at the Ettore Majorana Foundation and Center for Scientific Culture, Erice, Italy. Recent progress and new trends in the field of simulation and modeling in three branches of science — astrophysics, biology, and climatology — are described in papers presented by outstanding scientists. The impact of new technologies on the design of novel data analysis systems and the interrelation among different fields are foremost in scientists' minds in the modern era. This book therefore focuses primarily on data analysis methodologies and techniques.
Download or read book Computational Studies for 1 57 Scale Large Blast Simulator LBS Configurations with the BLAST2D Code written by and published by . This book was released on 1990 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the continuing research efforts of the Blast Dynamics Branch at the U.S. Army Ballistic Research Laboratory (BRL) is to simulate the flow that results from nuclear explosions and to test the nuclear survivability of military equipment. When atmospheric nuclear blast tests were banned, chemical explosive tests were designed and conducted to simulate the blast and thermal pulses produced by real nuclear explosions. These full-scale tests provided data for analysis of nuclear survivability to tactical Army equipment. However, the logistics and expense of full-scale chemical explosive tests meant that an average of only one test could be conducted every two years. A series of computational simulations are performed for comparison to experimental data from a 1/57 -scale Large Blast Simulator (LBS) experimental shock tube. The computations simulate experiments with various high pressure and temperature initial driver gas conditions. In addition to temperature and pressure variations, geometry and numerical accuracy variation are performed and studied. The computations were performed using an axisymmetric, inviscid, time-accurate, finite-volume numerical technique which employs upwind flux differencing with total variation diminishing techniques. Computational results are presented in the form of static and stagnation pressure versus time histories and contour plots. Keywords: Supercomputer simulations, Euler equations, Upwind.
Download or read book Mineral Resource Estimation written by Mario E. Rossi and published by Springer Science & Business Media. This book was released on 2013-12-21 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mineral resource estimation has changed considerably in the past 25 years: geostatistical techniques have become commonplace and continue to evolve; computational horsepower has revolutionized all facets of numerical modeling; mining and processing operations are often larger; and uncertainty quantification is becoming standard practice. Recent books focus on historical methods or details of geostatistical theory. So there is a growing need to collect and synthesize the practice of modern mineral resource estimation into a book for undergraduate students, beginning graduate students, and young geologists and engineers. It is especially fruitful that this book is written by authors with years of relevant experience performing mineral resource estimation and with years of relevant teaching experience. This comprehensive textbook and reference fills this need.
