Comparison of SDOF Analysis Results to Test Data for Different Types of Blast Loaded Components

2014 ◽  
Author(s):  
Chuck Oswald ◽  
Marlon Bazan
Keyword(s):  
Test Data ◽  
Different Types ◽  
Sdof Analysis

The Choice of the Propeller

1966 ◽  
Vol 3 (02) ◽  
pp. 158-171
Author(s):  
J. D. van Manen
Keyword(s):  
Test Data ◽  
Model Test ◽  
Testing Technique ◽  
Full Size ◽  
Cavitation Inception ◽  
Different Types

In this paper the four main requirements for a propeller are dealt with. These requirements concern efficiency, cavitation, propeller-excited forces and stopping abilities. In a propeller diagram the characteristic efficiency curves for different conditions are explained. A comparison of the optimum efficiencies for various types of propulsors is given, and the applications on a 130,000-dwt tanker are considered. Cavitation-inception curves both for a specific propeller and for systematic propeller series are discussed. Predicted torque and thrust fluctuations, based on model-test data, and the results of measurements on the full-size ship are compared. Finally a quasi-steady testing technique, developed to analyze different types of stopping maneuvers, is described.

Recent Developments in Hydraulic Couplings

1935 ◽  
Vol 130 (1) ◽  
pp. 75-190 ◽  
Author(s):  
Harold Sinclair
Keyword(s):  
Test Data ◽  
Good Deal ◽  
Hydraulic Coupling ◽  
Different Types ◽  
Recent Developments ◽  
History Of ◽  
Torque Converters ◽  
The Difference

The use of hydraulic couplings in practically all fields of engineering has increased rapidly during the last few years. The paper traces the history of the Vulcan-Sinclair hydraulic coupling, which is of the turbo or hydro-kinetic type, from the days of its inception up to the present time, and gives details of other designs of the displacement or hydro-static type that have been developed, and the principles upon which they operate. The main advantages of the turbo design are enumerated and considerable test data are given, with particular reference to the Vulcan coupling, which, in theory, is the forerunner of the Vulcan-Sinclair designs. Advantage is taken to explain the difference between fluid couplings and torque converters, concerning which a good deal of confusion exists. The differences between the various types of Vulcan-Sinclair hydraulic couplings and the improvements that have been effected in design during recent years are described in detail. The paper deals comprehensively with numerous applications of the different types of couplings covering both the industrial and automotive fields. The difficulties, and their cures, which have arisen in connexion with a number of applications are given prominence. A section deals with change-speed gearboxes arranged in conjunction with hydraulic couplings for use in Diesel traction.

Experimental Investigation on Reaeration Performance in Parallel Flashboard Spillway

2011 ◽  
Vol 347-353 ◽  
pp. 2375-2379
Author(s):  
Ke Jian Chu ◽  
Zu Lin Hua ◽  
Li Gu ◽  
Xiao Dong Liu ◽  
Qi Ming Li
Keyword(s):  
Experimental Investigation ◽  
Froude Number ◽  
Test Data ◽  
Water Depth ◽  
Discharge Current ◽  
Oxygen Transfer ◽  
Discharge Rate ◽  
Empirical Correlations ◽  
Different Types ◽  
Drop Water

The reaeration performance in smooth and parallel flashboard spillways with 3cm, 6cm and 9cm board space over curve dams has been experimentally investigated respectively. Reaeration efficiencies of different types of spillways, in particular the effects of varying discharge rate of overflow and drop-water depth have been taken account in detail. The test data illustrates that the reaeration efficiency increases with increasing drop-water depth, and decreases with increasing discharge current; the flashboard spillways appear to offer markedly higher reaeration efficiency than the smooth spillway, which increases gradually with reduction of the space between streamwise adjacent flashboards. Empirical correlations predicting spill Froude number Fdo, relative weir depth hw/h and reaeration efficiency of different types of spillways on curve dams are developed. The results indicate that flashboard spillways are effective for oxygen transfer.

scholarly journals CHARACTERIZE THE QUALITY OF COLOR, AROMA, TEXTURE AND TASTE OF COWPEA (Vigna unguiculata (L.) Walp.) TEMPEH FERMENTED BY DIFFERENT TYPES OF YEAST

2016 ◽  
Vol 6 (1) ◽  
pp. 34-41
Author(s):  
Wardiah Wardiah ◽  
Samingan Samingan ◽  
Amelia Putri
Keyword(s):  
Test Data ◽  
Vigna Unguiculata ◽  
Good Source ◽  
Physical Quality ◽  
Significance Level ◽  
Random Design ◽  
Organoleptic Test ◽  
Different Types ◽  
Potential Opportunity

Cowpea (Vigna unguiculata (L.) Walp.) has high content of nutrients and good source of phytoprotein. Therefore, it has potential opportunity to replace soybean in producing tempeh. The types of fermentation agent influence its quality, so it is crucial to study the use of types of tempeh yeast with different growt media in making cowpea tempeh. The study was aimed to characterize the quality of color, aroma, texture, and taste of cowpea tempeh fermented by different types of yeast. The method was experimental with complete random design, four treatments and six replicates. The parameter were physical quality; color, aroma, texture, and taste of tempeh. Data was collected by organoleptic test. Data was analysed using ANOVA at the 5 % significance level. The results showed that the preference levels of panelists differed against all parameters. Yeast utilizing cassava as its substrate produced cowpea tempeh with the highest preference level for all parameter.

scholarly journals Impact of Different Weft Materials and Washing Treatments on Moisture Management Characteristics of Denim

2012 ◽  
Vol 7 (1) ◽  
pp. 155892501200700 ◽  
Author(s):  
Muhammad Mushtaq Mangat ◽  
Tanveer Hussain ◽  
Vladimir Bajzik
Keyword(s):  
Test Data ◽  
Statistical Analyses ◽  
Weft Yarn ◽  
Cotton Yarn ◽  
Moisture Management ◽  
Different Types

The aim of this study was to investigate the effects of different types of weft yarn materials and washing treatments on the moisture management properties of denim fabrics. Fabrics were developed with five different types of weft yarns made of cotton, polyester, spun polypropylene, air-textured polypropylene and stuffer-box crimped polypropylene. In all cases 100% cotton yarn was used as warp. Samples from each fabric were subjected to 10 diverse types of washing/finishing treatments and the treated samples were tested for dissimilar moisture management indices on an SDL Atlas moisture management tester. The statistical analyses of the test data show that the effect of different types of weft yarns and washing treatments is significant. Based on the results of this study, denim fabrics can be developed with enhanced moisture management properties.

Review of detail categories of lattice girder node joints of EC 3

2021 ◽  
Author(s):  
Helen Bartsch ◽  
Markus Feldmann
Keyword(s):  
Fatigue Strength ◽  
Data Base ◽  
Fatigue Test ◽  
Test Data ◽  
Design Recommendations ◽  
Database Structure ◽  
Different Types ◽  
Set Up ◽  
Lattice Girder

<p>The paper deals with the re-evaluation of detail categories of lattice girder node joints based on fatigue test data. An elaborate database structure has been set up to evaluate the available fatigue test data in a differentiated way. Detail categories of different types of K and N joints have been investigated and re- evaluated based on the developed data base. Geometric influences on the fatigue strength have been analysed and design recommendations are given.</p>

Motorcycle Accident Reconstruction

2022 ◽  
Author(s):  
Nathan Rose
Keyword(s):  
Test Data ◽  
Materials Science ◽  
Empirical Test ◽  
Analytical Models ◽  
Accident Reconstruction ◽  
Philosophical Approach ◽  
Motorcycle Accident ◽  
Different Types ◽  
Motorcycle Crashes ◽  
Physical Principles

Accident reconstruction utilizes principles of physics and empirical data to analyze the physical, electronic, video, audio, and testimonial evidence from a crash, to determine how and why the crash occurred, how the crash could have been avoided, or to determine whose description of the crash is most accurate. This process draws together aspects of mathematics, physics, engineering, materials science, human factors, and psychology, and combines analytical models with empirical test data. Different types of crashes produce different types of evidence and call for different analysis methods. Still, the basic philosophical approach of the reconstructionist is the same from crash type to crash type, as are the physical principles that are brought to bear on the analysis. This book covers a basic approach to accident reconstruction, including the underlying physical principles that are used, then details how this approach and the principles are applied when reconstructing motorcycle crashes. This second edition of Motorcycle Accident Reconstruction presents a thorough, systematic, and scientific overview of the available methods for reconstructing motorcycle crashes. This new edition contains: Additional theoretical models, examples, case studies, and test data. An updated bibliography incorporating the newest studies in the field. Expanded coverage of the braking capabilities of motorcyclists. Updated, refined, and expanded discussion of the decelerations of motorcycles sliding on the ground. A thoroughly rewritten and expanded discussion of motorcycle impacts with passenger vehicles. Updated coefficients of restitution for collisions between motorcycles and cars. A new and expanded discussion of using passenger car EDR data in motorcycle accident reconstruction. A new section covering recently published research on post-collision frozen speedometer readings on motorcycles. A new section on motorcycle interactions with potholes, roadway deterioration, and debris and expanded coverage of motorcycle falls. This second edition of Motorcycle Accident Reconstruction is a must-have title for accident reconstructionists, forensic engineers, and all interested in understanding why and how motorcycle crashes occur.

scholarly journals A New Empirical Correlation for Estimation of EBF Steel Frame Behavior Factor under Near-Fault Earthquakes Using the Genetic Algorithm

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Seyed Abdonnabi Razavi ◽  
Navid Siahpolo ◽  
Mehdi Mahdavi Adeli
Keyword(s):  
Genetic Algorithm ◽  
Test Data ◽  
Mean Squared Error ◽  
Time History ◽  
Training Data ◽  
Geometrical Properties ◽  
Behavior Factor ◽  
Near Fault ◽  
Different Types ◽  
Near Fault Earthquakes

The most important feature of the behavior factor is that it allows the structural designer to be able to evaluate the structural seismic demand, using an elastic analysis, based on force-based principles quickly. In most seismic codes, this coefficient is merely dependent on the type of lateral resistance system and is introduced with a fixed number. However, there is a relationship between the behavior factor, ductility (performance level), structural geometric properties, and type of earthquake (near and far). In this paper, a new and accurate correlation is attempted to predict the behavior factor (q) of EBF steel frames, under near-fault earthquakes, using the genetic algorithm (GA). For this purpose, a databank consisting of 12960 data is created. To establish different geometrical properties of models, 3−, 6−, 9−, 12−, 15, and 20− story steel EBF frames were considered with 3 different types of link beam, 3 different types of column stiffness, and 3 different types of brace slenderness. Using nonlinear time history under 20 near-fault earthquake, all models were analyzed to reach 4 different performance levels. 6769 data were used as GA training data. Moreover, to validate the correlation, 2257 data were used as test data for calculating mean squared error (MSE) and correlation coefficient (R) between the predicted values of (q) and the real values. In addition, the MSE and R were calculated for correlation in the train and test data. Also, the comparison of the response of maximum inelastic displacement of 5 stories EBF from the proposed correlation and the mean inelastic time-history analysis confirms the accuracy of the estimate relationship.

The extinction time of a general birth and death process with catastrophes

1986 ◽  
Vol 23 (04) ◽  
pp. 851-858 ◽  
Author(s):  
P. J. Brockwell
Keyword(s):  
Laplace Transform ◽  
Size Distribution ◽  
Sufficient Conditions ◽  
Necessary And Sufficient Conditions ◽  
Death Process ◽  
Extinction Time ◽  
Birth And Death Process ◽  
Different Types ◽  
The Laplace Transform ◽  
Necessary And Sufficient

The Laplace transform of the extinction time is determined for a general birth and death process with arbitrary catastrophe rate and catastrophe size distribution. It is assumed only that the birth rates satisfyλ0= 0,λj&gt; 0 for eachj&gt; 0, and. Necessary and sufficient conditions for certain extinction of the population are derived. The results are applied to the linear birth and death process (λj=jλ, µj=jμ) with catastrophes of several different types.

Differentiating between different forms of moral obligations

2020 ◽  
Vol 43 ◽  
Author(s):  
Rajen A. Anderson ◽  
Benjamin C. Ruisch ◽  
David A. Pizarro
Keyword(s):  
Moral Character ◽  
Moral Obligations ◽  
Different Types

Abstract We argue that Tomasello's account overlooks important psychological distinctions between how humans judge different types of moral obligations, such as prescriptive obligations (i.e., what one should do) and proscriptive obligations (i.e., what one should not do). Specifically, evaluating these different types of obligations rests on different psychological inputs and has distinct downstream consequences for judgments of moral character.

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