Forensic Engineering Review of Crush Coefficients

1993 ◽  
Vol 10 (2) ◽  
Author(s):  
Joel T. Hicks
Keyword(s):  
Test Data ◽  
Computer Code ◽  
Mathematical Methods ◽  
Forensic Engineering

Basic mathematics for computing crush coefficients from test data is presented. This information is supplemented with computer code for CRASH and SMAC coefficients resulting form both rigid and movable barrier tests. Original CRASH3 crush data, supplemented by NHTSA test data through 1984, is tabulated and analyzed using a variety of logical and mathematical methods. The work is an extension of an analysis begun by Engineering Dynamics in 1987, where their filtered data has been grouped for observation. By understanding the data obtained in this earlier period of testing, the Forensic Engineer is better able to understand and use the information developed during almost ten years of subsequent testing.

scholarly journals Forensic Engineering Techniques For Testing And Predicting Lp-Gas Container Relief Venting

2004 ◽  
Vol 21 (2) ◽  
Author(s):  
James A. Petersen
Keyword(s):  
Test Data ◽  
Pressure Relief Valve ◽  
Relief Valve ◽  
Pressure Relief ◽  
Temperature Changes ◽  
Flammable Gas ◽  
Forensic Engineering ◽  
Pressure Changes ◽  
Liquefied Gas

When An Lp-Gas Container Is Involved In A Fire, Flammable Gas Is Usually Vented From The Relief Valve. One Of The First Questions Is Whether The Container Vented The Gas That Caused The Fire Or Whether Gas Was Vented Due To The Fire Heating The Container. If The Relief Valve Vents Gas That Initiates The Fire, It Is Usually Due To An Overfilled Container. This Paper Discusses; 1) The Prediction Of The Rate Of Container Warming Due To Normal Temperature Changes, 2) The Resulting Pressure Changes Of The Liquefied Gas, 3) The Reaction Of The Pressure Relief Valve And The Quantity Of Lp-Gas Vented During The Operation Of The Relief Valve, 4) Designing The Experiment And 4) Adjusting The Model To Reflect Test Data.

233U Evaluation Comparison Study

2014 ◽  
Author(s):  
Mohammad Alrwashdeh ◽  
Aniseh Abdalla ◽  
Kan Wang
Keyword(s):  
Cross Sections ◽  
Least Square Method ◽  
Computer Code ◽  
Data Bank ◽  
Least Square ◽  
Mathematical Methods ◽  
Bayes Method ◽  
Critical System ◽  
Section Data ◽  
Data Libraries

The aim of this study is to investigate the availability and accuracy of the cross section data for 233U to perform the calculations of the critical system. Two evaluated data libraries are available, U.S. data bank (ENDF) and the Japanese data bank (JENDL), by using BAYES method for resonance parameters available in SAMMY code and weighted least square method with nonlinear regression by using FITWR computer code. Evaluation of the 233U has been investigated by using of SAMMY code, in order to generate a useful data base for critical calculations, the computer code FITWR for experimental - experimental data fitting show same results obtained from Bayes method included within SAMMY code, with a slight deference in the results at the evaluated cross sections due to different mathematical methods have different results.

Validation of Computer Models for Nuclear Material Shipping Packages

2007 ◽  
Author(s):  
Narendra K. Gupta ◽  
Eugene P. Shine ◽  
Richard C. Tuckfield ◽  
Jeffrey T. Fong
Keyword(s):  
Finite Element ◽  
Test Data ◽  
Computer Model ◽  
Thermal Response ◽  
Mesh Size ◽  
Computer Code ◽  
Computer Models ◽  
Physical Reality ◽  
Nuclear Material ◽  
Convergence Criteria

Computer models are abstractions of physical reality and are routinely used for solving practical engineering problems. These models are prepared using large complex computer codes that are widely used in the industry. Patran/Thermal is such a finite element computer code that is used for solving complex heat transfer problems in the industry. Finite element models of complex problems involve making assumptions and simplifications that depend upon the complexity of the problem and upon the judgment of the analysts. The assumptions involve mesh size, solution methods, convergence criteria, material properties, boundary conditions, etc. that could vary from analyst to analyst. All of these assumptions are, in fact, candidates for a purposeful and intended effort to systematically vary each in connection with the others to determine there relative importance or expected overall effect on the modeled outcome. These kinds of models derive from the methods of statistical science and are based on the principles of experimental designs. These, as all computer models, must be validated to make sure that the output from such an abstraction represents reality [1,2]. A new nuclear material packaging design, called 9977, which is undergoing a certification design review, is used to assess the capability of the Patran/Thermal computer model to simulate 9977 thermal response. The computer model for the 9977 package is validated by comparing its output with the test data collected from an actual thermal test performed on a full size 9977 package. Inferences are drawn by performing statistical analyses on the residuals (test data – model predictions).

scholarly journals Impact of Higher Freeze Point Fuels on Naval Aircraft Operations

1986 ◽  
Author(s):  
R. A. Kamin ◽  
P. M. McConnell
Keyword(s):  
Test Data ◽  
Three Dimensional ◽  
Wind Tunnel Test ◽  
Flight Test ◽  
Computer Code ◽  
Scale Test ◽  
Process Studies ◽  
Freeze Point ◽  
Tank Geometry ◽  
The Impact

Refinery process studies have indicated that the relaxation of the JP-5 freeze point specification is a viable means of increasing jet fuel availability. The Naval Air Propulsion Center is investigating the impact of higher freeze point fuels on naval aircraft operations. Six fuels, with freeze points ranging from −55°F to +10°F, were tested in two instrumented external fuel tanks. Thirty hours of flight test and one hundred hours of wind tunnel test data have been accumulated. This information is being used in conjunction with laboratory and bench scale test data to support the development of a three dimensional computer code. This code will predict fuel cool down and hold-up (unpumpable frozen fuel) for any fuel tank geometry during a mission. Initial results indicate that the current JP-5 freeze point specification of −51°F is conservative and could be safely relaxed.

scholarly journals Forensic Engineering Analysis Of Motorcycle Impacts Using Rotational Mechanics And Fork/Vehicle Deformation

2012 ◽  
Vol 29 (1) ◽  
Author(s):  
Jerry S. Ogden ◽  
Kloberdanz Katrina M.
Keyword(s):  
Impact Velocity ◽  
Test Data ◽  
Impact Test ◽  
Linear Momentum ◽  
Engineering Analysis ◽  
Forensic Engineering ◽  
Ejection Speed ◽  
Rotational Mechanics

Methods Of Reconstructing Motorcycle Collisions Have Traditionally Been Limited To Speed From Skid Marks, Speeds From Scrapes Or Gouges, Speed From Rider Ejection, Speed From Linear Momentum, Or Sometimes Speed From Witness Observations. Oftentimes, The Data Necessary For Analysis Is Either Misunderstood Or Misinterpreted. This Paper Tests The Applicability Of Using Rotational Mechanics And Specific Models For Motorcycle Front Fork Deformation And Vehicle Deformation When Determining Motorcycle Impact Velocity. Additionally, The Results Of These Methods Are Statistically Tested For Significance And Reliability Against Independent Motorcycle Impact Test Data.

U233 Data Evaluation for Criticality Study

2016 ◽  
Vol 2 (3) ◽  
Author(s):  
Mohammad Alrwashdeh ◽  
Wang Kan
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Computer Code ◽  
Data Fitting ◽  
Multiplication Factor ◽  
Cross Section Data ◽  
Mathematical Methods ◽  
Bayes Method ◽  
Section Data ◽  
Experimental Data Fitting

The aim of this study is to investigate the available U233 cross section data for adequate calculation of critical benchmark experiments, to calculate the multiplication factor Keff for several benchmarks in both fast and thermal energy ranges. The evaluation of the U233 has been investigated using SAMMY code, in order to generate a useful database for criticality calculations; the computer code FITWR for experimental data fitting shows the same results obtained from the Bayes method included within the SAMMY code, with a slight difference in the results in the evaluated cross sections due to different mathematical methods having different results. Excellent results for the calculated Keff values are obtained for several benchmarks in the thermal and fast benchmarks considered in this study.

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