Simulation Study of Jet Formation and Depth of Penetration against Steel Targets at Different Cone Angles Using Autodyn-2D Hydrocode

2014 ◽  
Vol 722 ◽  
pp. 76-79
Author(s):  
A. Mukhtar ◽  
Zheng Xiang Huang ◽  
A.Q. Malik ◽  
Xu Dong Zu ◽  
Qiang Qiang Xiao
Keyword(s):  
Total Energy ◽  
Cone Angle ◽  
Experimental Results ◽  
Oil Well ◽  
Jet Formation ◽  
Depth Of Penetration ◽  
Energy Behavior ◽  
Image Capturing ◽  
Simulation Results ◽  
Euler Solver

Jets obtained from shaped charge at different cone angle are simulated using Euler solver in Autodyn-2D Hydrocode against a 56mm-diameter of the charge. An OFHC copper liner of thickness 0.8mm and 54 mm-diameters is used for jet formation analysis. Point detonation method is used for Charge ignition. The simulation results are presented at 30 micro-second after initiation. Energy behavior is predicted at different obliquities. Numerical simulations are compared with the existing experimental results for liner angle 60. The depth of penetration and volume of the crater produced is measured. It is observed that simulation results are in good agreement with the experimental results. Flash X-ray Radiography was used for image capturing. It is observed that kinetic energy of the jet decreases as angle increases, also total energy of the explosive increases and hence the Ratio of the K.E of the jet to the total energy of the explosive decreases as the angle increases. The volume of the crater produced in steel at 65° has the highest value among the jets considered, so it can be used in oil well perforation also.

Penetration Performance of Shaped Charge Jets Using Insensitive Munition: Simulative and Experimental Studies

2015 ◽  
Vol 1102 ◽  
pp. 119-123
Author(s):  
Mukhtar Ahmed ◽  
Zheng Xiang Huang ◽  
A.Q. Malik ◽  
Xu Dong Zu ◽  
Qiang Qiang Xiao ◽  
...  
Keyword(s):  
Total Energy ◽  
Experimental Studies ◽  
Shaped Charge ◽  
Experimental Results ◽  
Jet Formation ◽  
Steel Target ◽  
Image Capturing ◽  
Detonation Method ◽  
Simulation Results ◽  
A Charge

The simulation and experimental studies of the Jets obtained from different conical liners from a charge having 56mm-diameter is presented in this paper. An OFHC copper liner of thickness 1 mm and 54 mm-diameters is used for jet formation analysis. Charge ignition is made by using Point detonation method. The simulation results are obtained from Ansysis Autodyn 2-D hydrocode. Experiments are conducted for a charge having 600 conical liner. Flash X-ray Radiography is used for image capturing. The performance capacity of standard shaped charge is predicted by its penetration against steel target. It is observed that kinetic energy of the jet decreases as angle increases, also total energy of the explosive increases and hence the Ratio of the K.E of the jet to the total energy of the explosive decreases as the angle increases. Simulation results are compared with the experimental results. It is observed that simulation results are in favorable agreement within acceptable range of error with the experimental results.

scholarly journals Penetration Evaluation of Explosively Formed Projectiles Through Air and Water Using Insensitive Munition: Simulative and Experimental Studies

2016 ◽  
Vol 6 (1) ◽  
pp. 913-916 ◽  
Author(s):  
M. Ahmed ◽  
A. Q. Malik ◽  
S. A. Rofi ◽  
Z. X. Huang
Keyword(s):  
Formation Flying ◽  
Experimental Studies ◽  
Experimental Results ◽  
Jet Formation ◽  
Depth Of Penetration ◽  
X Ray ◽  
Steel Target ◽  
Great Reliability ◽  
Polymer Bonded Explosives ◽  
The Difference

The process of formation, flying, penetration of explosively-formed projectiles (EFP) and the effect of water on performance of the charge for underwater applications is simulated by Ansysis Autodyn 2D-Hydro code. The main objective of an explosively formed projectile designed for underwater applications is to disintegrate the target at longer standoff distances. In this paper we have simulated the explosively formed projectile from OFHC-Copper liner for 1200 conical angle. The Affect of water on the penetration of EFP is determined by simulations from Ansysis Autodyn 2-D Hydrocode and by varying depth of water from 1CD-5CD. The depth of penetration against steel target is measured experimentally. Flash X-Ray Radiography (FXR) is used to capture EFP jet formation and its penetration against target is measured by depth of penetration experiments. Simulation results are compared with experimental results. The difference in simulated and experimental results for depth of penetration is about 7 mm, which lies within favorable range of error. The jet formation captured from FXR is quite clear and jet velocity determined from Flash X-ray radiography is the same as the ones obtained by using other high explosives. Therefore, it is indicated that Insensitive Munition (8701) can be utilized instead of Polymer Bonded Explosives (PBX) for air and underwater environments with great reliability and without any hazard.

Vibration Control of a String Using Zero-Displacement Constraint at a Point Near One Boundary: Theory and Experiment

2012 ◽  
Author(s):  
Assaad AlSahlani ◽  
Frank B. Mathis ◽  
Ranjan Mukherjee
Keyword(s):  
Total Energy ◽  
Vibration Control ◽  
Vibration Suppression ◽  
Full Length ◽  
Experimental Results ◽  
The Other ◽  
Boundary Theory ◽  
Displacement Constraint ◽  
Simulation Results ◽  
Theory And Experiment

A new method for vibration control of a string is proposed in which a zero displacement constraint is sequentially applied and released at a point near one boundary. When the constraint is applied, the string is partitioned into two vibrating strings, one of them is much shorter in length than the other. The vibration in the shorter segment of the string decays out much faster than the longer segment due to higher frequency. After the vibration in the shorter segment has decayed, the constraint is removed and the string is allowed to vibrate in its full length. The total energy is now redistributed over the full length, and this provides the scope for application of the constraint again for further reduction of energy. Vibration suppression is achieved through sequential application and removal of the constraint and this is simulated using a linear damped model of the string. Experiments were conducted and the experimental results were found to match well with simulation results.

The Influence of Target Mesh on the Simulation Results of High Velocity Projectile Penetration

2011 ◽  
Vol 121-126 ◽  
pp. 2323-2327
Author(s):  
Chuang Chen ◽  
Wei Bing Li ◽  
Xiao Ming Wang ◽  
Wen Bin Li
Keyword(s):  
High Velocity ◽  
Radial Direction ◽  
Axial Direction ◽  
Experimental Results ◽  
Side Length ◽  
Mesh Quality ◽  
Depth Of Penetration ◽  
Size And Shape ◽  
Variation Curve ◽  
Simulation Results

In the simulation, the mesh quality has a significant impact on the simulation results. To study the influence of the size and shape of target mesh on the high velocity projectile penetration into concrete, using ANSYS/LS-DYNA software in this paper, different target mesh side lengths are selected to simulate, the variation curve that depth of penetration (DOP) with target mesh side length is obtained, select 1/6 times projectile radius as the target mesh side length can meet the accuracy requirements. Based the target mesh side length above, different radios of the mesh side length in the radial direction to the side length in the axial direction are selected to simulate, the influence law of calculating results that depend on the mesh shape is acquired. The contrast validation of experimental results is carried out, the simulation results are in agreement with the experimental results.

Simulation of carding condensing process

2021 ◽  
pp. 004051752098812
Author(s):  
Xixi Qian ◽  
Yuanying Shen ◽  
Qiaoli Cao ◽  
Jun Ruan ◽  
Chongwen Yu
Keyword(s):  
Experimental Results ◽  
Simulation Results ◽  
Carding Machine ◽  
The Web

A simulation describing the fiber movement during the condensation was conducted, and the effect of the condensation in the carding machine was studied. The simulation results showed that the condensation has the blending and the evening effect on the condensed sliver, which can be explained by the fiber rearrangement. Moreover, the increasing web width and the decreasing condensing length can result in a more uniform sliver. Further, the evening effect of the web width on the web was verified by experiments. The simulation results were in general agreement with the experimental results.

Ab Initio Investigation of Structural and Electronic Properties of ErPb3 in AB3 Structure

2016 ◽  
Vol 28 ◽  
pp. 39-42 ◽  
Author(s):  
Shubha Dubey ◽  
Gitanjali Pagare ◽  
Ekta Jain ◽  
Sankar P. Sanyal
Keyword(s):  
Bulk Modulus ◽  
Total Energy ◽  
Electronic Properties ◽  
Density Of States ◽  
Experimental Results ◽  
Energy Calculation ◽  
Present Calculation ◽  
Full Potential ◽  
Local Spin Density Approximation ◽  
Calculated Density

The structural properties and electronic properties of the intermetallic compound ErPb3 which crystallize in AuCu3 type structure (AB3) are studied by means of first principles total energy calculation using full potential linearized plane wave method (FP-LAPW) within the generalized gradient approximation of Perdew, Burke and Ernzrhof (PBE) and local spin density approximation (LSDA) for the exchange correlation functional and including spin magnetic calculation. The total energy is computed as a function of volume and fitted to the Birch-Murnaghan equation of state. The ground state properties of this compound such as equilibrium lattice parameter (a0), bulk modulus (B), and its pressure derivative (B’) are calculated and compared with the available experimental results. We find good agreement with the other theoretical and experimental results. For the compounds, the values of lattice constants obtained by PBE-GGA overestimates and by LSDA underestimates the available experimental values for the same, which verifies the reliability of the present calculation. The value obtained for the bulk modulus is 50.63 GPa. The analysis of electronic properties is achieved by the calculation of the band structures and the density of states in both the spin up and spin down modes, which show a metallic character of ErPB3 due to zero band gap. The values of calculated density of states are found to be 0.36 eV/states and 11.46 eV/states in spin-up and spin-down mode respectively. The calculated magnetic moment (μm) of ErPb3 is 2.06.

The Effect of Different Turbulence Models on the Emitter Discharge by Using Computational Fluid Dynamics

2013 ◽  
Vol 662 ◽  
pp. 586-590
Author(s):  
Gang Lu ◽  
Qing Song Yan ◽  
Bai Ping Lu ◽  
Shuai Xu ◽  
Kang Li
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Flow Field ◽  
Turbulence Models ◽  
Experimental Results ◽  
Turbulent Model ◽  
Simulation Results ◽  
Rsm Model ◽  
Dynamics Method ◽  
Emitter Discharge

Four types of Super Typhoon drip emitter with trapezoidal channel were selected out for the investigation of the flow field of the channel, and the CFD (Computational Fluid Dynamics) method was applied to simulate the micro-field inside the channel. The simulation results showed that the emitter discharge of different turbulent model is 4%-14% bigger than that of the experimental results, the average discharge deviation of κ-ω and RSM model is 5, 4.5 respectively, but the solving efficiency of the κ-ω model is obviously higher than that of the RSM model.

Design of Magnetic Levitated Thrust Bearing Experiment Table

2011 ◽  
Vol 199-200 ◽  
pp. 597-602
Author(s):  
Shou Fa Liu ◽  
Zhang Jie Shi ◽  
Chun Feng Li
Keyword(s):  
Thrust Bearing ◽  
Deformation Measurement ◽  
Experimental Results ◽  
Electromagnetic Parameters ◽  
Ansys Simulation ◽  
Overall Design ◽  
Experimental Parameters ◽  
Structural Dimensions ◽  
Simulation Results

In this paper, the overall design of magnetic levitated thrust bearing experiment table was completed, of which the main experimental parameters those are electromagnetic parameters and structural dimensions were determined, in addition, the joint debugging and deformation measurement are performed. Analysis results showed that theoretical value, ANSYS simulation results and experimental results were similar, which said that it is feasible to perform stiffness check of the thrust collar on the experiment table.

Pneumatic Mechanism of Gas Cooled or Heated Through a Throttle Orifice

2011 ◽  
Vol 141 ◽  
pp. 408-412 ◽  
Author(s):  
Yao Bao Yin ◽  
Ling Li
Keyword(s):  
Equation Of State ◽  
Total Energy ◽  
Negative Energy ◽  
Experimental Results ◽  
Attractive Force ◽  
Positive Energy ◽  
Real Gas ◽  
Thomson Coefficient ◽  
Theoretical Results ◽  
Conversion Temperature

The mechanism of gas cooled or heated through a pneumatic throttle orifice is analyzed. Supposing the total energy of the gas is constant, if the force between the molecules does positive energy, it makes gas heated; if it does negative energy, it makes gas cooled. The conversion temperature of gas is an evaluation parameter for repulsive or attractive force. It has utilized Joule-Thomson coefficient and real gas equation of state to obtain the characteristics of conversion temperature, and the relationships between the molecules distance and the phenomenon of gas cooled or heated after throttle at normal temperature by the conversion characteristics are achieved. The experimental results agreed well with the theoretical results.

The Development of an Identification Photo Booth System based on a Deep Learning Automatic Image Capturing Method

2020 ◽  
Author(s):  
Yu-Xiang Zhao ◽  
Yi-Zeng Hsieh ◽  
Shih-Syun Lin
Keyword(s):  
Deep Learning ◽  
Experimental Results ◽  
Automatic Annotation ◽  
Learning Method ◽  
Facial Region ◽  
Facial Landmarks ◽  
Image Capturing ◽  
The Face ◽  
Facial Contours

With advances in technology, photo booths equipped with automatic capturing systems have gradually replaced the identification (ID) photo service provided by photography studios, thereby enabling consumers to save a considerable amount of time and money. Common automatic capturing systems employ text and voice instructions to guide users in capturing their ID photos; however, the capturing results may not conform to ID photo specifications. To address this issue, this study proposes an ID photo capturing algorithm that can automatically detect facial contours and adjust the size of captured images. The authors adopted a deep learning method (You Only Look Once) to detect the face and applied a semi-automatic annotation technique of facial landmarks to find the lip and chin regions from the facial region. In the experiments, subjects were seated at various distances and heights for testing the performance of the proposed algorithm. The experimental results show that the proposed algorithm can effectively and accurately capture ID photos that satisfy the required specifications.

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