Kinetic energy at collision of two automobiles

2021 ◽  
pp. 108-110
Author(s):  
Ригина Элифхановна Агаханова ◽  
Keyword(s):  
Kinetic Energy ◽  
Mechanical System ◽  
Dynamic Characteristic ◽  
Elastic Collision ◽  
Inelastic Collisions ◽  
Kinetic Moment ◽  
Shock Pulses

At collision of two automobiles under the influence of shock pulses the change of their speed occurs. The dynamic characteristic of movement of mechanical system consisting of two automobiles includes traffic, kinetic moment regarding motionless centre and kinetic energy. On the basis of dynamics theorems the author has determined a loss of kinetic energy of central-straight collision of two automobiles. The paper considers specific cases — elastic and absolutely inelastic collisions. It is established that at elastic collision the kinetic energy decreases by the amount of kinetic energy of lost velocities with amendment that includes a coefficient of recovery at collision.

scholarly journals Simulation of Bullet Fragmentation and Penetration in Granular Media

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5243
Author(s):  
Froylan Alonso Soriano-Moranchel ◽  
Juan Manuel Sandoval-Pineda ◽  
Guadalupe Juliana Gutiérrez-Paredes ◽  
Usiel Sandino Silva-Rivera ◽  
Luis Armando Flores-Herrera
Keyword(s):  
Kinetic Energy ◽  
Granular Media ◽  
Elastic Collision ◽  
Smooth Particle Hydrodynamics ◽  
X Ray ◽  
Bullet Fragmentation ◽  
Particle Hydrodynamics ◽  
The Moment ◽  
Physical Phenomena ◽  
The Impact

The aim of this work is to simulate the fragmentation of bullets impacted through granular media, in this case, sand. In order to validate the simulation, a group of experiments were conducted with the sand contained in two different box prototypes. The walls of the first box were constructed with fiberglass and the second with plywood. The prototypes were subjected to the impact force of bullets fired 15 m away from the box. After the shots, X-ray photographs were taken to observe the penetration depth. Transient numerical analyses were conducted to simulate these physical phenomena by using the smooth particle hydrodynamics (SPH) module of ANSYS® 2019 AUTODYN software. Advantageously, this module considers the granular media as a group of uniform particles capable of transferring kinetic energy during the elastic collision component of an impact. The experimental results demonstrated a reduction in the maximum bullet kinetic energy of 2750 J to 100 J in 0.8 ms. The numerical results compared with the X-ray photographs showed similar results demonstrating the capability of sand to dissipate kinetic energy and the fragmentation of the bullet caused at the moment of impact.

Ionic Wind Application to Vortex Ring Generator and its Transportation Efficiency

2019 ◽  
Author(s):  
Kengo Fukunaga ◽  
Masayoshi Satake ◽  
Noboru Maeda ◽  
Kazushi Shikata ◽  
Tomohisa Ezaka
Keyword(s):  
Kinetic Energy ◽  
Mechanical System ◽  
Electric Power ◽  
Vortex Ring ◽  
Energy Conversion Efficiency ◽  
Target Distance ◽  
Vortex Rings ◽  
Experimental Measurements ◽  
Ionic Wind ◽  
External Turbulence

Abstract In this study, ionic wind generated in corona discharge is focused for producing an air flow without having mechanical actuators. First, the kinetic energy conversion efficiency to ionic wind from electric power is experimentally estimated to be 0.32%. Then, it is confirmed that intermittent blows of ionic wind enable to produce vortex rings without using mechanical system. We adopt novel sub-chamber structure to avoid the concentration of the substance in a vortex ring low, so that the substance concentration transported to the target distance of 200 mm increases by 9%. As an application, the efficiency for moisture transportation is evaluated through experimental measurements. As a result, it is shown that the substance (moisture) can be transported at an efficiency of about 85% to target distance of 200 mm under conditions where the influence of external turbulence is small.

Kinematic Design of Mechanisms for the Control of an Oscillating Wing

2007 ◽  
Author(s):  
Louis-Alexis Allen Demers ◽  
Cle´ment Gosselin
Keyword(s):  
Kinetic Energy ◽  
Mechanical System ◽  
Electric Power ◽  
Additional Function ◽  
Kinematic Design

This work is part of a project which aims at the development of underwater generators using oscillating wings. One of the important challenges in the design of a system collecting the kinetic energy of a fluid is the transformation of this energy into electric power [1]. Since it is not possible to pass directly from the movement of a fluid to electric power, it is necessary to conceive an intermediate mechanical system. Its function is to convert the kinetic energy of the fluid into kinetic energy of a mechanism capable of converting kinetic energy into electric power. In this work, the mechanical system also has an additional function, i.e., to guide the orientation of the blades (wings) throughout the cycle of movement in order to maximize the efficiency.

Magnetic accumulation of kinetic energy from a reciprocating mechanical system for a dynamic behaviour improvement

2019 ◽  
Vol 451 ◽  
pp. 138-146
Author(s):  
Jan Valtera ◽  
Jana Svobodová ◽  
Michal Strnad ◽  
Petr Žabka ◽  
Vítězslav Kubeš
Keyword(s):  
Kinetic Energy ◽  
Mechanical System ◽  
Dynamic Behaviour

Dynamic Characteristic Research of Planar Four-Bar Mechanism with Joint Clearance

2012 ◽  
Vol 215-216 ◽  
pp. 912-916 ◽  
Author(s):  
Shao Jun Bo ◽  
Rui Bin Guo
Keyword(s):  
Mechanism Design ◽  
Mechanical System ◽  
Dynamic Characteristic ◽  
Contact Force ◽  
Dynamic Characteristics ◽  
Geometrical Model ◽  
Accurate Prediction ◽  
Dynamics Simulation ◽  
Joint Clearance ◽  
Dynamics Analysis

The joint clearance on mechanism dynamic characteristics influence can not be ignored. This paper established a geometrical model of planar four-bar mechanism, it built the model of contact force and friction and embedded into the software of ADAMS dynamics analysis mechanical system, which analysis the dynamics simulation of mechanism. We obtain a accurate prediction of dynamic characteristics of mechanism with joint clearance effect from the analysis. What's more the results provide reference and basis for later mechanism design [1,2,3].

DISPLACEMENT-IMPULSE COMPLEMENTARY IN ANALYTICAL MECHANICS

1994 ◽  
Vol 18 (3) ◽  
pp. 225-247
Author(s):  
F.P.J. Rimrott ◽  
B. Tabarrok ◽  
J. Altenbach
Keyword(s):  
Kinetic Energy ◽  
Potential Energy ◽  
Mechanical System ◽  
Equations Of Motion ◽  
Linear Momentum ◽  
Analytical Mechanics ◽  
Translatory Motion ◽  
Generalized Displacements ◽  
Energy Aspects

Based on Euler’s linear momentum law, equations of motion of a mechanical system, consisting of a collection of point masses and force elements, such as springs or dashpots, are derived using generalized impulses, rather than generalized displacements, as coordinates. There are limitations to this approach involving both potential energy aspects and kinetic energy aspects. The present paper if of introductory nature and restricted to systems with translatory motion.

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