Numerical study of asteroid impact on the earth’s surface with allowance for gravitation and radiation energy transfer

1999 ◽  
Vol 72 (6) ◽  
pp. 1131-1141
Author(s):  
G. S. Romanov ◽  
A. S. Smetannikov
Keyword(s):  
Energy Transfer ◽  
Numerical Study ◽  
Radiation Energy ◽  
Asteroid Impact

scholarly journals Numerical Study Of The Targeted Energy Transfer Between The Euler-Bernoulli Beam And A Nonlinear Energy Sink

2021 ◽  
Author(s):  
Mohi U. Rahamat Ullah
Keyword(s):  
Energy Transfer ◽  
Primary Structure ◽  
Numerical Study ◽  
Element Model ◽  
Impact Excitation ◽  
Nonlinear Stiffness ◽  
Targeted Energy Transfer ◽  
Stiffness Property ◽  
Energy Sink ◽  
The Impact

Targeted energy transfer (TET) refers to the spatial transfer of energy between a primary structure of interest and isolated oscillators called the energy sink (ES). In this work, the primary structure of interest is a slender beam modeled by the Euler-Bernoulli theory, and the ES is a single-degree-of-freedom oscillator with either linear or cubic nonlinear stiffness property. The objective of this study is to characterize the TET and the effectiveness of ES under impact and periodic excitations. By using the scientific computation package, MATLAB, numerical simulations are carried out based on excitations of various strength and locations. Both time and frequency domain characterizations are used. For the impact excitation, the ES with the cubic nonlinear stiffness property is more superior to the linear oscillator in that larger percentage of the impact energy can be dissipated there. The main energy transfer was found to be due to a 3- to-1 frequency coupling between the first bending mode and the ES. For the periodic excitation, however, both linear and nonlinear ES exhibit generally poorer performance than the case with the impact excitation. Future works should focus on the frequency-energy relationship of the periodic solution of the underlying Hamiltonian, as well as using finite element model to verify the simulation results.

Applications of Radiation Energy Transfer

2020 ◽  
pp. 865-886
Author(s):  
John R. Howell ◽  
M. Pinar Mengüç ◽  
Kyle Daun ◽  
Robert Siegel
Keyword(s):  
Energy Transfer ◽  
Radiation Energy

scholarly journals Short-wavelength experiments on laser pulse interaction with extended pre-plasma at the PALS-installation

2015 ◽  
Vol 34 (1) ◽  
pp. 94-108 ◽  
Author(s):  
T. Pisarczyk ◽  
S.Yu. Gus'kov ◽  
O. Renner ◽  
R. Dudzak ◽  
J. Dostal ◽  
...  
Keyword(s):  
Shock Wave ◽  
Energy Transfer ◽  
Laser Beam ◽  
Laser Energy ◽  
Laser System ◽  
Radiation Energy ◽  
Point Of View ◽  
Main Beam ◽  
Appreciable Effect ◽  
Fast Electrons

AbstractThe paper is a continuation of research carried out at Prague Asterix Laser System (PALS) related to the shock ignition (SI) approach in inertial fusion, which was carried out with use of 1ω main laser beam as the main beam generating a shock wave. Two-layer targets were used, consisting of Cu massive planar target coated with a thin polyethylene layer, which, in the case of two-beam irradiation geometry, simulate conditions related to the SI scenario. The investigations presented in this paper are related to the use of 3ω to create ablation pressure for high-power shock wave generation. The interferometric studies of the ablative plasma expansion, complemented by measurements of crater volumes and Kα emission, clearly demonstrate the effect of changing the incident laser intensity due to changing the focal radius on efficiency of laser energy transfer to a shock wave and fast electron emission. The efficiency of the energy transfer increases with the radius of the focused laser beam. The pre-plasma does not significantly change the character of this effect. However, it unambiguously results in the increasing temperature of fast electrons, the total energy of which remains very small (<0.1% of the laser energy). This study shows that the optimal radius from the point of view of 3ω radiation energy transfer to the shock wave is the maximal one used in these experiments and equal to 200 µm that corresponds to the minimal effect of two-dimensional (2D)-expansion. Such a result is typical for the ablation process determined by electron conductivity energy transfer under the conditions of one-dimensional or 2D matter expansion without any appreciable effect due to energy transfer by fast electrons. The 2D simulations based on application of the ALANT-HE code and an analytical model that includes generation and transport of hot electrons has been used to support of experimental data.

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