Vibrations of a Double Beam Structure Carrying a High-Pressure Driven Projectile

2019 ◽  
Author(s):  
Alexander Khair ◽  
Bingen Yang
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
High Pressure ◽  
Dynamic Stress ◽  
Beam Theory ◽  
Weapon System ◽  
Beam Structure ◽  
Double Beam ◽  
Simulation Results ◽  
Pressure Driven

Abstract In this paper, a mathematical model of a double beam structure carrying a high-pressure driven projectile is developed for investigation of the physical behaviors of gun barrels during firing. The dynamic response of such a weapon system is particularly interesting when reduction of muzzle vibrations and relevant dynamic stress in the structure is needed to improve the life cycle of the gun. In the model presented, the Timoshenko beam theory is implemented, and realistic characteristics of the physical system are considered. Numerical simulation results are presented for the displacement and rotation of the two beams, and the rigid-body projectile mass.

scholarly journals Population Behavior in the Mathematical Model of the Spread of COVID19 Type SEIRS

2021 ◽  
Vol 6 (2) ◽  
pp. 83-88
Author(s):  
Asmaidi As Med ◽  
Resky Rusnanda
Keyword(s):  
Mathematical Modeling ◽  
Numerical Simulation ◽  
Mathematical Model ◽  
Everyday Life ◽  
Applied Mathematics ◽  
Living Things ◽  
Simulation Results ◽  
Parameter Values ◽  
The Mathematical Model ◽  
Disease Free

Mathematical modeling utilized to simplify real phenomena that occur in everyday life. Mathematical modeling is popular to modeling the case of the spread of disease in an area, the growth of living things, and social behavior in everyday life and so on. This type of research is included in the study of theoretical and applied mathematics. The research steps carried out include 1) constructing a mathematical model type SEIRS, 2) analysis on the SEIRS type mathematical model by using parameter values for conditions 1and , 3) Numerical simulation to see the behavior of the population in the model, and 4) to conclude the results of the numerical simulation of the SEIRS type mathematical model. The simulation results show that the model stabilized in disease free quilibrium for the condition  and stabilized in endemic equilibrium for the condition .

Research on the Numerical Simulation of Silting in Floodplain and Scouting in Main Channel of Over-Bank Flooding in the Lower Yellow River

2011 ◽  
Vol 255-260 ◽  
pp. 3692-3696
Author(s):  
Xiao Lei Zhang ◽  
Dong Po Sun ◽  
Feng Ran Zhang
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
Yellow River ◽  
Main Channel ◽  
River Channel ◽  
Lower Yellow River ◽  
The Lower Yellow River ◽  
Water And Sediment ◽  
Simulation Results ◽  
Set Up

The 2-D water and sediment mathematical model which reflects silting in floodplain and scouting in main channel of over-bank flooding in the Lower Yellow River has been set up in this paper. Through carrying on 2-D water and sediment numerical simulation of the “96.8” typical flood, the author studied influence of over-bank flooding on flood travel and transverse exchange. The primary simulation results show that, adopting the over-bank flooding for silting in floodplain and scouting in main channel effectively guaranteed and expanded transverse exchange between floodplain and main channel and maintained the river channel vigor. This can relieve “secondary suspended river” states in the Low Yellow River to a certain extent; at the same time, the different magnitudes of over-bank floods have different effect of silting in floodplain and scouting in main channel.

Numerical Simulation of Seepage Field in Aquifer under the Coal Seam

2014 ◽  
Vol 955-959 ◽  
pp. 3120-3124
Author(s):  
Kai Bian ◽  
Shi Lei Chen ◽  
Xue Yuan Li ◽  
Ying Wang Zhao
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
Coal Seam ◽  
Three Dimensional ◽  
Seepage Field ◽  
Limestone Aquifer ◽  
Flow Models ◽  
Hydrogeological Parameters ◽  
Simulation Results ◽  
Technical Basis

In order to figure out seepage field in aquifer under the coal seam, the geology and hydrogeology conditions systematically of study area were analyzed, hydrogeological conceptual model was generalized, mathematical model was built, seepage field of the Taiyuan limestone aquifer was simulated with software Feflow. Simulation results show that hydrogeological parameters of Taiyuan limestone aquifer change greatly in different partitions. The model also indicates the heterogeneity of karst fissure of Taiyuan limestone aquifer. The drainage quantity is from the Ordovician limestone aquifer besides supplying from runoff of upstream and capture excretion of downstream. The research is an attempt to simulate the seepage field in aquifer under coal seam, to some extent, it also provides a technical basis for safe coal mining and as a reference for simulation constructions of three-dimensional groundwater flow models in similar coal mines.

scholarly journals Deactivation by sintering of the cobalt catalyst during the Fischer-Tropsch reaction

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Dounia Alihellal ◽  
Lemnouer Chibane ◽  
Mohamed El-Amine Slimani
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
Active Sites ◽  
Cobalt Catalyst ◽  
Reaction Rates ◽  
Operating Conditions ◽  
Molar Ratio ◽  
Fischer Tropsch ◽  
Simulation Results ◽  
By Products

In the present work, the deactivation by sintering of cobalt-based catalyst during Fischer-Tropsch synthesis at low temperature was studied by numerical simulation. For this purpose, a mathematical model was developed. The obtained simulation results allowed us to highlight and improve the understanding of the deactivation phenomena of cobalt-based Fischer-Tropsch catalysts by sintering. The main results also show that the sintering phenomenon is strongly dependent on the operating conditions, in particular, the temperature, the pressure, and the H2/CO molar ratio, as well as the reaction by-products such as water. The results obtained can, therefore, be used to understand more the sintering mechanism which may be linked to the change in the concentration of the active sites and the reaction rates.

Fuzzy Parameter Based Mathematical Model on Forest Biomass

2018 ◽  
Vol 13 (04) ◽  
pp. 179-193 ◽  
Author(s):  
Prabir Panja
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
Time Delay ◽  
Human Population ◽  
Equilibrium Points ◽  
Forest Biomass ◽  
Simulation Results ◽  
The Stability ◽  
Fuzzy Parameter

In this paper, a fuzzy mathematical model has been developed by considering forest biomass, human population and technological effort for the conservation of forest biomass as separate compartments. We have assumed that the forest biomass and human population grows logistically. We have considered that forest biomass decreases due to industrialization, food, shelter, etc., for humans. For the conservation of forest biomass, some modern technological efforts have been used in this model. Also, time delay of use of modern technological effort for the conservation of forest biomass has been considered on forest biomass. According to the assumptions, a fuzzy mathematical model on forest biomass is formulated. Next we have determined different possible equilibrium points. Also, the stability of our proposed system around these equilibrium points has been discussed. Finally, some numerical simulation results have been presented for better understanding of our proposed mathematical model.

Numerical Simulation of Piston Ring Lubrication with Multi-Grade Oil

2014 ◽  
Vol 595 ◽  
pp. 83-90
Author(s):  
A. Mohamad Salaheldin ◽  
Qun Zheng ◽  
Xi Qun Lu ◽  
Yi Bin Guo ◽  
Jing Zhi Zhu
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
Piston Ring ◽  
Reynolds Equation ◽  
Viscosity Index ◽  
Power Losses ◽  
Oil Characteristics ◽  
Simulation Results ◽  
Viscosity Index Improvers ◽  
Piston Ring Lubrication

The present work mainly focuses on study the piston ring lubrication parameters, and the influence of viscosity index improvers onthese parameters. Mathematical model has been developed using average Reynolds equation considering fully flooded inlet condition. The oil characteristics used in the modeling is enhanced by a series of polyacrylates viscosity index improvers, in order to indicate the effect of them on the oil film thickness, friction force, and hydrodynamic power losses. The simulation results help to explain the mechanism of action of viscosity index improvers in the oil during running conditions.

Mechanical Behavior of the Long Rod Penetrator during Launch

2004 ◽  
Vol 261-263 ◽  
pp. 1629-1634
Author(s):  
J.B. Kim
Keyword(s):  
Numerical Simulation ◽  
Dynamic Stress ◽  
Three Dimensional ◽  
Von Mises Stress ◽  
The Third ◽  
Rod System ◽  
Long Rod ◽  
Dynamic Stress Analysis ◽  
Simulation Results ◽  
Von Mises

This study presents a three-dimensional dynamic stress analysis of the sabot/rod system during launch. A study was undertaken to investigate the influence of forward sabot diameter and rod length on the stress of projectile rod traveling in the gun tube. Three types of gun tube profile were simulated. The first profile is straight. The second profile of the tube droop is caused only by gravity and the third is combined droop profile which is caused by gravity with the manufacture status. Numerical simulation results showed that the maximum von Mises stress due to in-bore behavior of the sabot/rod system could be decreased by changing the forward sabot diameter in a tube drooped by gravity loads with the manufacture status. The results also showed that the stress of rod was affected by the factor of at·L/D· ( at ; combined acceleration, L ; length of rod, D ; diameter of rod), and it becomes minimum when the aspect ratio L/D becomes 14 in the model used in the study. in the study

Modeling and Simulation of a Stand-Alone Hydrogen Photovoltaic Fuel Cell Hybrid System

2014 ◽  
pp. 829-859
Author(s):  
M.T. Benmessaoud ◽  
A. Boudghene Stambouli ◽  
M. Tioursi
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
Power Generation ◽  
High Temperature ◽  
Fuel Cell ◽  
Hydrogen Generation ◽  
Storage System ◽  
Storage Unit ◽  
Pv Array ◽  
Simulation Results

In this Chapter, a hybrid Photovoltaic-Fuel Cell (PV-FC) generation system employing an electrolyser for hydrogen generation is designed and simulated. The system is applicable for remote areas or isolated loads. This system has been simulated via a developed general dynamic mathematical model which analytically describes the electric subsystems. Some interesting simulation results are presented in this chapter. Specific attention is paid to the investigation of the dynamic analysis of the photovoltaic, fuel cell, and electrolyser system at the connection. The objective of this study is to evaluate the performance of an autonomous stationary power generation and thermal coupling a PV array and a storage system for hydrogen, consisting of an electrolyser, a storage unit of gas, and a fuel cell of high temperature. Hydrogen is the only means that stores electricity. Stationary applications of a few kilowatts are evaluated by numerical simulation in MATLAB/SIMULINK.

Numerical Simulations on Assembly Modifications for Annular Casing of One Centrifugal Pump

2012 ◽  
Vol 516-517 ◽  
pp. 966-969
Author(s):  
Yi Zhang Fan ◽  
Zhi Gang Zuo ◽  
Shu Hong Liu ◽  
Yu Jun Sha ◽  
Yu Lin Wu
Keyword(s):  
Numerical Simulation ◽  
High Pressure ◽  
High Temperature ◽  
Numerical Simulations ◽  
Centrifugal Pump ◽  
Radial Force ◽  
Hydraulic Efficiency ◽  
Centrifugal Pumps ◽  
Safety Factors ◽  
Simulation Results

Centrifugal pumps adopt annular casings instead of volute casings when working in high temperature and high pressure conditions, which results in conservative safety factors in sacrifice of hydraulic efficiency. This paper presents numerical simulations on two assembly modification methods for one annular casing imitating the volute casing to improve hydraulic performance. Method one was the eccentric axis method. Method two was the extended vane method. Numerical simulation results, given by CFX, showed that both the two method could increase the hydraulic efficiency and head while rise in radial force was small.

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