scholarly journals Numerical Simulation of Multiple Explosively Formed Projectile Warhead Forming Characteristics considering Various Materials

2021 ◽  
Vol 2021 ◽  
pp. 1-20
Author(s):  
Guangsong Ma ◽  
Guanglin He ◽  
Yukuan Liu ◽  
Yulong Zhang
Keyword(s):  
Numerical Simulation ◽  
Significant Influence ◽  
Curvature Radius ◽  
Liner Material ◽  
Thickness Change ◽  
Research Results ◽  
Shell Design ◽  
Long Rod ◽  
Forming Characteristics ◽  
Detonation Energy

To study the influence of different liner structures and materials (copper, steel, and tungsten) on the forming characteristics of multiple explosively formed projectile (MEFP) with integrated liner and shell designs, three types of liners with different structures were designed. LS-DYNA was used for numerical simulation, and the results show that the thickness change at the center of the liner has no obvious influence on the shape of the explosively formed projectile (EFP). However, the curvature radius of the liner has a significant influence on the shape of the EFP. When the liner material is copper and the curvature radius of the liner is greater than 8 mm, the EFP shape approximates an ellipsoidal or hemispherical shape and the EFP forming speed is between 1900 m/s and 2400 m/s. When the material of the liner is steel or tungsten and the curvature radius of the liner is thicker than 8 mm, the liner is not able to form projectiles in the shape of a sphere, ellipsoid, or long rod. By comparing the forming speed from 1#EFP to 4#EFP, it can be said that MEFP with integrated liner and shell design displays a certain pressurization effect. Research results show that, for small-caliber MEFP warheads, subject to the size of the warhead, when the liner is steel or tungsten, the detonation energy generated by the limited charge does not result in the liner forming an effective EFP. However, when the liner material is selected as copper, the EFP forming shape and speed are more appropriate.

scholarly journals Study of the Forming Characteristics of Small-Caliber Ammunition with Circumferential MEFP

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 891 ◽  
Author(s):  
Guangsong Ma ◽  
Guanglin He ◽  
Yukuan Liu ◽  
Yachao Guo
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Structural Parameters ◽  
Outer Wall ◽  
Diameter Ratio ◽  
Curvature Radius ◽  
Preliminary Design ◽  
Finite Element Software ◽  
Forming Characteristics ◽  
Simulation Results

To study the influence of the structural parameters of the ammunition liner of small-caliber ammunition on the forming characteristics of the projectile, an integrated circumferential multiple explosively formed projectile (MEFP) warhead with an integrated shell and the liner was initially designed, and the wall thickness of the liner is variable. LS-DYNA finite-element software is used to simulate the integral circumferential MEFP of the preliminary design, based on the numerical simulation results, the influence of the thickness at the center of the liner, and the curvature radius of the liner on the shape and velocity of the formed projectile. The numerical simulation results show that when the thickness of the center of the liner is constant and the curvature radius increases gradually, the velocity of the formed projectile decreases and the length: Diameter ratio of formed projectile decreases gradually. When the curvature radius of the liner remains unchanged, the velocity of the formed projectile decreases with the increase of the thickness of the center of the liner, and the shape of the formed projectile does not change significantly. The results show that when the design of integrating the shell and the liner was adopted for the integral circumferential MEFP warhead, the shape of the formed projectile is greatly affected by the curvature radius of the liner (curvature radius of inner and outer walls of the liner), but less by the thickness of the center of the liner. The velocity of the formed projectile is affected by the curvature radius of the inner and outer walls of the liner and the thickness of the center of the liner. Moreover, the influence of the thickness of the center of the liner on the velocity of the formed projectile is greater than that of the curvature radius of the outer wall of the liner.

scholarly journals Study on the Influence of Initiation Model on the Forming Characteristics of MEFP Warhead

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Guangsong Ma ◽  
Guanglin He ◽  
Zenghui Qiao ◽  
Yulong Zhang
Keyword(s):  
Numerical Simulation ◽  
Numerical Simulations ◽  
Single Point ◽  
Research Results ◽  
Single Column ◽  
Forming Characteristics ◽  
Simulation Results

To study the influence of different initiation modes on the forming characteristics of the MEFP warhead, numerical simulations were carried out on three types of initiation modes. The numerical simulation results showed that the number of EFPs was the least by double-column multipoint synchronous initiation, the number of EFPs was the largest by the central single-point (multipoint) initiation, and single-column single-point (multipoint synchronous) detonation forms the number of EFPs between central single-point (multipoint synchronous) detonation and double-column multipoint synchronous detonation. For the MEFP warhead of a small-caliber grenade, whether it is center detonation or eccentric detonation, the EFP velocity of multipoint detonation is higher than that of the single-point detonation, the velocity of double-column multipoint eccentric synchronous detonation is 2%–9% higher than that of the single-column single-point (multipoint eccentric synchronous) detonation, the velocity of double-column multipoint eccentric synchronous detonation is 10%–17% higher than that of the central single-point (multipoint synchronous) detonation, and the velocity of single-column single-point (multipoint eccentric synchronous) detonation is 5%–17% higher than that of the central single-point (multipoint synchronous) detonation. Research results show that although the number of EFPs is reduced during eccentric single-point (multipoint simultaneous) detonation of MEFP warheads, a higher velocity can be obtained.

PENGARUH HARGA DAN KUALITAS PRODUK TERHADAP LOYALITAS PELANGGAN ALUMUNIUM

2019 ◽  
Vol 7 (2) ◽  
Author(s):  
Widodo Widodo ◽  
Marshelly Chandra Kumala
Keyword(s):  
Data Collection ◽  
Product Quality ◽  
Customer Loyalty ◽  
Significant Influence ◽  
Secondary Data ◽  
Primary Data ◽  
Research Results ◽  
Is Research ◽  
Quality Of Products

<em>The objective of this is research was conducted to find out how the influence of the price and quality of products against customer loyalty at PT. Alakasa Extrusindo Jakarta. This research was conducted in Alakasa Extrusindo PT by doing data collection, through the primary data and secondary data.  The research results showed that the simultaneous price variables  and product quality  has a positive and significant effect against the variable customer loyalty. partially showed that price variables has a positive and significant influence towards customer loyalty. And partially showed that product quality variables  has a positive and significant influence towards customer loyalty</em>

The Effect of Profitability, Asset Structure, Company Size on Stock Returns with Corporate Governance as Moderating Variables in Manufacturing Companies on the IDX in 2009-2018

2021 ◽  
Vol 8 (8) ◽  
pp. 55-63
Author(s):  
Deby Yurika Lasmarito Siahaan ◽  
Rina Br Bukit ◽  
Tarmizi .
Keyword(s):  
Corporate Governance ◽  
Stock Returns ◽  
Firm Size ◽  
Significant Influence ◽  
Stock Return ◽  
Company Size ◽  
Research Model ◽  
Manufacturing Companies ◽  
Research Results ◽  
Moderating Variables

The research objective was to examine and analyze whether Profitability, Asset Structure, Firm Size simultaneously and partially influenced Stock Returns in Manufacturing Companies. In addition, this study also tries to prove whether Corporate Governance can be used as a moderator in the research model. The research results showed that simultaneously Profitability, Asset Structure, Firm Size significantly influenced Stock Returns. Partially, profitability has a positive and significant influence on Stock Returns. Asset Structure has a positive and significant influence on Stock Returns, and Company size has a positive and insignificant influence on Stock Returns. The variable of Corporate Governance can moderate the influence of Asset Structure on Stock Returns. However, Corporate Governance will not be able to moderate the influence of Profitability on Stock Returns. Keywords: Profitability, Asset Structure, Firm Size, Stock Return, and Corporate Governance.

Numerical Simulation Research on the Shape of Top Coal Drawn-Body in Gently Inclined Seam

2012 ◽  
Vol 468-471 ◽  
pp. 2248-2254
Author(s):  
Qiang Li ◽  
Wan Kui Bu ◽  
Hui Xu ◽  
Xiao Bo Song
Keyword(s):  
Numerical Simulation ◽  
Numerical Model ◽  
Random Medium ◽  
Body Movement ◽  
The Other ◽  
Simulation Research ◽  
Research Results ◽  
Shape Equation ◽  
The Difference ◽  
Meso Scale

The numerical model of top coal drawing in gently inclined seam is built based on PFC2d software. By comparing with the theory of drawn-body movement law, it can be obtained that the shape of top coal drawn-body accords with the theory of random medium movement. The research results show that the form of the shape equation of top coal drawn-body is uniform while the top coal caving angle is different. On the other hand, with the difference of top coal caving angle and drawing height, the shape of top coal drawn-body is differential at the meso scale, which depends on the parameters of the shape equation of top coal drawn-body.

scholarly journals PENGARUH KESADARAN MEREK, KEPUASAN KONSUMEN DAN KEPERCAYAAN KONSUMEN ATAS MEREK TERHADAP PEMBELIAN ULANGTIKET PESAWAT FIREFLY DI BANDA ACEH

2019 ◽  
Vol 1 (1) ◽  
Author(s):  
Ika Rahmadani ◽  
Tia Risky Ayunda
Keyword(s):  
Data Analysis ◽  
Significant Influence ◽  
Consumer Satisfaction ◽  
Consumer Trust ◽  
Brand Awareness ◽  
Analysis Method ◽  
Research Results ◽  
Airline Tickets ◽  
Banda Aceh ◽  
Airline Ticket

ABSTRAKThe aim of this research is to know the influence of brand awareness, consumer satisfaction andconsumer trust on brand toward the re-purchasing of Firefly airline ticket in Banda Aceh. This study took 99respondents of re-purchasing of FireFly airline tickets in Banda Aceh. This research was conducted at the SultanIskandar Muda airport in Banda Aceh. Data analysis method which used in this research is multiple linearregression. The research results showed that the variables Brand Awareness, consumer satisfaction andconsumer trust for brand have significant influence to the repurchasing of Firefly airline tickets in Banda Aceh.In the future, it is expected that the re-purchasing of Firefly airline tickets in Banda Aceh should be able tomaintain their brand awareness, consumer satisfaction and consumer trust for brand and to improve otherfactors which is capable to creating consent to the consumer so that the consumer wants to recommendate to theothers.Keywords: Brand awareness, Consumer trust for brand, Cunsumer satisfaction, Repurchasing

scholarly journals Pengaruh Reliability, Responsiveness, Assurance, Empathy dan Tangibles Terhadap Kepuasan Konsumen GrabBike

2020 ◽  
Vol 3 (2) ◽  
pp. 34
Author(s):  
Lusiana Lusiana ◽  
Salamun Pasda ◽  
Mustari Mustari ◽  
Muhammad Ihsan Said Ahmad ◽  
Muhammad Hasan
Keyword(s):  
Regression Analysis ◽  
Data Analysis ◽  
Data Processing ◽  
Significant Influence ◽  
Random Sampling ◽  
Consumer Satisfaction ◽  
Quantitative Approach ◽  
Research Results ◽  
Transport Services ◽  
Analysis Technique

The purpose of this research are to see how reliability, responsiveness, assurance, empathy and tangibles affect the satisfaction of customer users of online transport services to UNM Economic students. Research conducted a method survey with quantitative approach. The population in this research is all students using grab bike online transport, ranging from 2016-2019 to 206 people. Sampling samples using technical samples of random sampling are 67 people. The instruments used to collect data are instruments of questionnaire, observation, and documentation. The data analysis technique used are regression analysis and hypothetical testing with T and F. data processing used SPSS version 21 for windows software. Research results show that variable as reliability, responsiveness, assurance, empathy, and tangibles are partial to positive and significant effects on users GrabBike online transport satisfaction. Simultaneously there is a positive and significant influence between reliability variables, responsiveness, assurance, empathy and tangibles to the consumer satisfaction users of GrabBike online transport services

scholarly journals Analysis of Influence of Micro Small and Medium Enterprises (MSMEs) Development as a Competitive Advantage to Creative Economic Development

2018 ◽  
Author(s):  
Bunga Aditi ◽  
SOPI PENTANA
Keyword(s):  
Economic Development ◽  
Data Analysis ◽  
Competitive Advantage ◽  
Path Analysis ◽  
Significant Influence ◽  
Small And Medium Enterprises ◽  
Creative Economy ◽  
Analysis Method ◽  
Research Results ◽  
Medium Enterprises

The purpose of this research is to analyze the influence of MSME development as competitive advantage toward creative economic development in Medan city. Data analysis method used in research is path analysis. Simultaneously, the research results of MSME Development and Competitive Advantage have a positive and significant effect on creative economy. Partially, the Influence of MSME Development has positive and significant influence to creative economy. Partially Competitive advantage positively and significantly influences the creative economy. The development of MSME has a positive and significant impact on competitive advantage. Indirectly MSME development positively affects the creative economy through competitive advantage

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