SIMULINK MODELING FOR CIRCUIT REPRESENTATION OF GRANULAR CHAINS

2013 ◽  
Vol 27 (13) ◽  
pp. 1350093 ◽  
Author(s):  
LOUIZA SELLAMI ◽  
ROBERT W. NEWCOMB ◽  
SURAJIT SEN
Keyword(s):  
Solitary Waves ◽  
Large Scale ◽  
Vlsi Circuit ◽  
Granular Chain ◽  
Mathematical System ◽  
Circuit Representation ◽  
Granular Chains ◽  
End Wall

After a review of the coupled Newton's equations for a small alignment of grains with a fixed reflecting end wall, the equations are put into block diagrams of Simulink. Simulink simulations are given for 6 grain systems for cubic and Hertz intergrain potentials. The expected granular solitary waves are seen in the simulations. The block diagrams hence convert a single impulse into a traveling energy bundle of fixed width. This work forms the necessary first step for the eventual realization of the mathematical system represented by the granular chain as a Very Large Scale Integrated (VLSI) circuit.

Large-Scale Simulation of the Clocking Impact of 2D Combustor Profile on a Two Stage High Pressure Turbine

2014 ◽  
Author(s):  
Thomas E. Dyson ◽  
David B. Helmer ◽  
James A. Tallman
Keyword(s):  
High Pressure ◽  
Large Scale ◽  
High Pressure Turbine ◽  
Cfd Simulations ◽  
Two Stage ◽  
Substantial Impact ◽  
Sliding Mesh ◽  
Wall Flow ◽  
End Wall ◽  
Film Flows

This paper presents sliding-mesh unsteady CFD simulations of high-pressure turbine sections of a modern aviation engine in an extension of previously presented work [1]. The simulation included both the first and second stages of a two-stage high-pressure turbine. Half-wheel domains were used, with source terms representing purge and film flows. The end-wall flow-path cavities were incorporated in the domain to a limited extent. The passage-to-passage variation in thermal predictions was compared for a 1D and 2D turbine inlet boundary condition. Substantial impact was observed on both first and second stage vanes despite the mixing from the first stage blade. Qualitative and quantitative differences in surface temperature distributions were observed due to different ratios between airfoil counts in the two domains.

scholarly journals Use of a Tracer Gas Technique to Study Mixing in a Low Speed Turbine

1981 ◽  
Author(s):  
J. D. Denton ◽  
S. Usui
Keyword(s):  
Boundary Layers ◽  
Large Scale ◽  
Small Concentration ◽  
Flame Ionization Detector ◽  
Ionization Detector ◽  
Tracer Gas ◽  
Low Speed ◽  
Flame Ionization ◽  
Air Turbine ◽  
End Wall

A method of using a flame ionization detector to study the movement of air containing a small concentration of ethylene is described. Ethylene is chosen because it has almost the same density as air so buoyancy effects are negligible. The technique is applied to flow in a bent duct and in a low speed air turbine. In both cases large scale migrations of the end wall boundary layers onto the suction surfaces are observed. However, in the turbine the span wise movement and mixing of the flow at mid-span is remarkably small.

Large-scale physical modeling of broken solitary waves impacting elevated coastal structures

2022 ◽  
pp. 1-21
Author(s):  
Clemens Krautwald ◽  
Hajo Von Häfen ◽  
Peter Niebuhr ◽  
Katrin Vögele ◽  
David Schürenkamp ◽  
...  
Keyword(s):  
Solitary Waves ◽  
Physical Modeling ◽  
Large Scale ◽  
Coastal Structures

Energy-Efficient Multiferroic Spin-Devices and Spin-Circuits

SPIN ◽  
2020 ◽  
Vol 10 (04) ◽  
pp. 2030001
Author(s):  
Kuntal Roy
Keyword(s):  
Energy Efficient ◽  
Large Scale ◽  
Spin Diffusion ◽  
Diffusion Length ◽  
Spin Current ◽  
Logic Gates ◽  
Low Energy ◽  
Circuit Representation ◽  
Spin Diffusion Length ◽  
Spin Devices

Spin-devices are switched by flipping spins without moving charge in space and this can lead to ultra-low-energy switching replacing traditional transistors in beyond Moore’s law era. In particular, the electric field-induced magnetization switching has emerged to be an energy-efficient paradigm. Here, we review the recent developments on ultra-low-energy, area-efficient, and fast spin-devices using multiferroic magnetoelectric composites. It is shown that both digital logic gates and analog computing with transistor-like high-gain region in the input-output characteristics of multiferroic composites are feasible. We also review the equivalent spin-circuit representation of spin-devices by considering spin potential and spin current similar to the charge-based counterparts using Kirchhoff’s voltage/current laws, which is necessary for the development of large-scale circuits. We review the spin-circuit representation of spin pumping, which happens anyway when there is a material adjacent to a rotating magnetization and therefore it is particularly necessary to be incorporated in device modeling. Such representation is also useful for understanding and proposing experiments. In spin-circuit representation, spin diffusion length is an important parameter and it is shown that a thickness-dependent spin diffusion length reflecting Elliott–Yafet spin relaxation mechanism in platinum is necessary to match the experimental results.

LARGE SCALE EXPERIMENTS ON EVOLUTION AND RUN-UP OF BREAKING SOLITARY WAVES

2007 ◽  
Vol 01 (03) ◽  
pp. 257-272 ◽  
Author(s):  
KAO-SHU HWANG ◽  
YU-HSUAN CHANG ◽  
HWUNG-HWENG HWUNG ◽  
YI-SYUAN LI
Keyword(s):  
Solitary Wave ◽  
Wave Height ◽  
Solitary Waves ◽  
Water Depth ◽  
Large Scale ◽  
Scale Effects ◽  
Wave Heights ◽  
Run Up ◽  
Hydraulics Laboratory ◽  
The Waves

The evolution and run-up of breaking solitary waves on plane beaches are investigated in this paper. A series of large-scale experiments were conducted in the SUPER TANK of Tainan Hydraulics Laboratory with three plane beaches of slope 0.05, 0.025 and 0.017 (1:20, 1:40 and 1:60). Solitary waves of which relative wave heights, H/h0, ranged from 0.03 to 0.31 were generated by two types of wave-board displacement trajectory: the ramp-trajectory and the solitary-wave trajectory proposed by Goring (1979). Experimental results show that under the same relative wave height, the waveforms produced by the two generation procedures becomes noticeably different as the waves propagate prior to the breaking point. Meanwhile, under the same relative wave height, the larger the constant water depth is, the larger the dimensionless run-up heights would be. Scale effects associated with the breaking process are discussed.

scholarly journals Rectification effect on solitary waves in the symmetric Y-shaped granular chain

2017 ◽  
Vol 19 (3) ◽  
Author(s):  
Xingyi Liu ◽  
Tengfei Jiao ◽  
Liang Ma ◽  
Jiaye Su ◽  
Weizhong Chen ◽  
...  
Keyword(s):  
Solitary Waves ◽  
Rectification Effect ◽  
Granular Chain

Binary collision approximation for solitary waves in a Y-shaped granular chain

2013 ◽  
Vol 22 (1) ◽  
pp. 014501 ◽  
Author(s):  
Qiong Chen ◽  
Xian-Qing Yang ◽  
Xin-Yin Zhao ◽  
Zhen-Hui Wang ◽  
Yue-Min Zhao
Keyword(s):  
Solitary Waves ◽  
Binary Collision ◽  
Binary Collision Approximation ◽  
Granular Chain ◽  
Collision Approximation

Large-Scale Analog Circuit Evolutionary Design Using a Real-Coded Scheme

2012 ◽  
Vol 220-223 ◽  
pp. 2036-2039
Author(s):  
Su Min Jiao ◽  
Cai Hong Wang ◽  
Xue Mei Wang
Keyword(s):  
Analog Circuits ◽  
Large Scale ◽  
Analog Circuit ◽  
Computing Time ◽  
Electronic System ◽  
Small Scale ◽  
Evolutionary Design ◽  
Continuous Space ◽  
Large Scale Problems ◽  
Circuit Representation

Analog circuits are of great importance in electronic system design. Recent evolutionary design results are usually small-scale analog circuits. This paper proposes a real-coded mechanism and uses it in the large-scale analog circuit evolutionary design. The proposed scheme evolves the circuit topology and size to a uniformed continuous space, in which the circuit representation is closed and of causality. Experimental results show that the proposed scheme can work successfully on many analog circuits with different kinds of characteristics. Comparing with other evolutionary methods before, the proposed scheme performs better on large-scale problems of circuit synthesis with higher search efficiency, lower computational complexity, and less computing time.

Traveling and solitary waves in monodisperse and dimer granular chains

2017 ◽  
Vol 31 (10) ◽  
pp. 1742001 ◽  
Author(s):  
Yuli Starosvetsky ◽  
K. R. Jayaprakash ◽  
Alexander F. Vakakis
Keyword(s):  
Solitary Wave ◽  
Solitary Waves ◽  
Traveling Waves ◽  
Granular Media ◽  
Equations Of Motion ◽  
Continuum Approximation ◽  
Granular Chains ◽  
Solitary Pulse ◽  
Countably Infinite ◽  
Dimer Granular Chains

We provide a review of propagating traveling waves and solitary pulses in uncompressed one-dimensional ([Formula: see text]) ordered granular media. The first such solution in homogeneous granular media was discovered by Nesterenko in the form of a single-hump solitary pulse with energy-dependent profile and velocity. Considering directly the discrete, strongly nonlinear governing equations of motion of these media (i.e., without resorting to continuum approximation or homogenization), we show the existence of countably infinite families of stable multi-hump propagating traveling waves with arbitrary wavelengths. A semi-analytical approach is used to study the dependence of these waves on spatial periodicity (wavenumber) and energy, and to show that in a certain asymptotic limit, these families converge to the single-hump Nesterenko solitary wave. Then the study is extended in dimer granular chains composed of alternating “heavy” and “light” beads. For a set of specific mass ratios between the light and heavy beads, we show the existence of multi-hump solitary waves that propagate faster than the Nesterenko solitary wave in the corresponding homogeneous granular chain composed of only heavy beads. The existence of these waves has interesting implications in energy transmission in ordered granular chains.

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