scholarly journals Theoretical and experimental research of anti-tank kinetic penetrator ballistics

2017 ◽  
Vol 65 (3) ◽  
pp. 399-404
Author(s):  
K. Motyl ◽  
M. Magier ◽  
J. Borkowski ◽  
B. Zygmunt
Keyword(s):  
Physical Model ◽  
Computer Simulations ◽  
Experimental Research ◽  
Experimental Measurement ◽  
Theoretical Calculations ◽  
Projectile Velocity ◽  
Test Range

Abstract A mathematical-physical model of the hypersonic anti-tank kinetic subcalibre projectile for 120 mm munition was built. Computer simulations of the projectile flight were performed for any angle of shooting, from 0° to 90°. Trajectories of projectile flights were determined considering all angles of shooting. Theoretical calculations were verified by experimental measurement of the projectile velocity in time while shooting on a test range. Some conclusions with regard to safety during hypersonic projectile shooting on the test range were formulated.

scholarly journals Theoretical and experimental research of supersonic missile ballistics

2015 ◽  
Vol 63 (1) ◽  
pp. 229-233 ◽  
Author(s):  
B. Zygmunt ◽  
K. Motyl ◽  
B. Machowski ◽  
M. Makowski ◽  
E. Olejniczak
Keyword(s):  
Numerical Analysis ◽  
Physical Model ◽  
Experimental Research ◽  
Simulation Program ◽  
Dynamic Parameters ◽  
Flight Tests ◽  
Test Range ◽  
Basic Parameters ◽  
Inertia Properties

Abstract A mathematical-physical model of a supersonic missile was built, taking into account the mass and inertia properties. The model was implemented in the MathCAD14 simulation program. A numerical analysis of the missile ballistics was conducted and basic parameters were determined: range, altitude, velocity and acceleration, which enabled a test range program for manufactured missile models to be drawn up. Initial flight tests of missiles were carried out at the test range. Satisfactory accordance of experimental and theoretical dynamic parameters of the missile under study was obtained.

Analysis of Material Punching Including a Rotational Speed of the Projectile

2015 ◽  
Vol 220-221 ◽  
pp. 571-576 ◽  
Author(s):  
Miroslaw Bocian ◽  
Krzysztof Jamroziak ◽  
Mariusz Kosobudzki
Keyword(s):  
Plastic Deformation ◽  
Computer Simulations ◽  
Experimental Research ◽  
Dynamic Load ◽  
Translational Motion ◽  
Viscous Friction ◽  
Perfectly Plastic ◽  
Plastic Yield ◽  
Materials Used ◽  
External Loads

Materials used for the construction of ballistic shields are characterized by a variety of behaviours under the influence of external loads. Ballistic impact (by a bullet) in armour (ballistic shield) is an example of the phenomena that could be considered in the category of a dynamic load caused by the strike of the mass. Computer simulations are commonly used in such situations. It is especially important to adopt a proper model of the behaviour of the material. This paper presents the results obtained by simulating free 3D points and using the application developed by the authors for the purpose of this research. The made calculations include the translational motion and rotary motion of the projectile as well as the stiffness of the material, the damping of the material, friction at the points of contacting surfaces, viscous friction and plastic deformation (the material beyond the plastic yield point is perfectly plastic). The results of simulations were validated with experimental research.

scholarly journals Use of Computer Simulations for the Understanding and Retention of Mathematical Concepts

2021 ◽  
Vol 7 (2) ◽  
pp. 70-86
Author(s):  
Farkhunda Rasheed Choudhary ◽  
Tariq Javed
Keyword(s):  
Computer Simulations ◽  
Experimental Research ◽  
Control Group ◽  
Mathematical Concepts ◽  
Mathematics Textbook ◽  
Lecture Method ◽  
Level Of Significance ◽  
Teaching Learning ◽  
Experimental Group ◽  
Better Than

Abstract Simulations provide unique features and instructional benefits for the improved understanding of concepts. This study aimed to find the effect of computer simulations on the understanding and retention of mathematical concepts. This was an experimental research. A sample of 100 students participated in this experimental research.  The sample was further distributed into an equal number of students in two groups. Some topics were selected from the grade–IX mathematics textbook. The selected mathematical topics were taught to the control group by lecture method whereas computer simulations were used for teaching mathematical concepts to the experimental group. Data analysis showed that in the posttest, the experimental group performed better than the control group at a 0.05 level of significance. The scores of the retention test of the experimental group were also found better than the control group. It is recommended to include computer simulations in the teaching-learning process for better comprehension of abstract concepts of mathematics.     Keywords: Achievement, Mathematical Concepts, Retention, Simulations

Experimental Research of New Rotor with Variable Clearance in Mixing the Short Fiber-Rubber Composite

2013 ◽  
Vol 706-708 ◽  
pp. 108-112
Author(s):  
Cai Jun Liu
Keyword(s):  
Experimental Study ◽  
Physical Model ◽  
Experimental Research ◽  
Short Fiber ◽  
Diameter Ratio ◽  
Rubber Composite ◽  
Material Mixing ◽  
The Ideal

The ideal effects of mixing the short fiber-rubber composite can not be reached under current conditions. This paper built the physical model for the short fiber mixes and disperses in rubber through studying the mixing mechanism of the short fiber-rubber composite. The new 6-wing synchronous rotor was designed according to the requirement of material mixing mechanism. The mixing requirement of the ordinary material and the reasonable length-diameter ratio of the short fiber could be met through changing the clearance gap between the rotor edge peak and mixer room. Finally, verify the theory through experimental study.

Investigation of the thermal decomposition mechanism of glycerol: the combination of a theoretical study based on the Minnesota functional and experimental support

2021 ◽  
Vol 23 (36) ◽  
pp. 20466-20477
Author(s):  
Dongdong Zhang ◽  
Yi Cao ◽  
Pan Zhang ◽  
Jiankang Liang ◽  
Ke Xue ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Experimental Research ◽  
Theoretical Study ◽  
Theoretical Calculations ◽  
Decomposition Mechanism ◽  
Thermal Decomposition Mechanism ◽  
Experimental Support

Theoretical calculations and experimental research are combined to study the anaerobic pyrolysis of glycerol.

scholarly journals The Role of Extended Range of Interactions in the Dynamics of Interacting Molecular Motors

2021 ◽  
Author(s):  
Cade Spaulding ◽  
Hamid Teimouri ◽  
S.L. Narasimha ◽  
Anatoly B. Kolomeisky
Keyword(s):  
Computer Simulations ◽  
Molecular Motors ◽  
Nearest Neighbor ◽  
Theoretical Calculations ◽  
Mean Field ◽  
Field Approximation ◽  
Mean Field Approximation ◽  
Experimental Investigations ◽  
Cellular Transport ◽  
Fundamental Diagram

Motor proteins, also known as biological molecular motors, play important roles in various intracellular processes. Experimental investigations suggest that molecular motors interact with each other during the cellular transport, but the nature of such interactions remains not well understood. Stimulated by these observations, we present a theoretical study aimed to understand the effect of the range of interactions on dynamics of interacting molecular motors. For this purpose, we develop a new version of the totally asymmetric simple exclusion processes in which nearest-neighbor as well as the next nearest-neighbor interactions are taken into account in a thermodynamically consistent way. A theoretical framework based on a cluster mean-field approximation, which partially takes correlations into account, is developed to evaluate the stationary properties of the system. It is found that fundamental current-density relations in the system strongly depend on the strength and the sign of interactions, as well as on the range of interactions. For repulsive interactions stronger than some critical value, increasing the range of interactions leads to a change from unimodal to trimodal dependence in the flux-density fundamental diagram. Theoretical calculations are tested with extensive Monte Carlo computer simulations. Although in most ranges of parameters excellent agreement between theoretical predictions and computer simulations is observed, there are situations when the cluster mean-field approach fails to describe properly the dynamics in the system. Theoretical arguments to explain these observations are presented. Our theoretical analysis clarifies the microscopic picture of how the range of interactions influences the dynamics of interacting molecular motors.

scholarly journals Analysis and Verification on Mechanics Mechanism for Flat Digging of Grab

2019 ◽  
Vol 256 ◽  
pp. 02016
Author(s):  
Chang Xu ◽  
Hanbin Xiao ◽  
Sheng Zou ◽  
Feng Zhu
Keyword(s):  
Mathematical Model ◽  
Theoretical Calculation ◽  
Experimental Research ◽  
Theoretical Calculations ◽  
Mechanical Analysis ◽  
Technical Support ◽  
Experimental Results ◽  
Good Agreement

The research on digging resistances is the key to designing the grab, improving the grab’s structure and realizing the automatic flat digging of grab dredger. This article focuses on the mechanical analysis and experimental research of grab’s flat digging combining with theoretical calculation and experiments in dredging process. The theoretical digging resistances in both horizontal and vertical directions have been investigated in mathematical model. With the help of flat digging experiments, the forces on hoist rope and closing rope have been recorded. Then, work out the horizontal and vertical digging resistances based on moment balance. Since a good agreement is achieved between the theoretical calculations with the corresponding independent experimental results, the research has been verified and provides technical support for flat digging in dredging process.

Sign in / Sign up

Export Citation Format

Share Document