scholarly journals Numerical Analysis of the Performance of an Innovative Daylighting System Named Modified Double Light Pipe

2021 ◽  
Vol 65 (2-4) ◽  
pp. 353-360
Author(s):  
P. Zazzini ◽  
A. Di Crescenzo ◽  
R. Giammichele
Keyword(s):  
Experimental Data ◽  
Steady State ◽  
Numerical Analysis ◽  
Dynamic Analysis ◽  
Numerical Approach ◽  
Steady State Regime ◽  
Dynamic Conditions ◽  
Light Pipe ◽  
State Regime ◽  
Better Than

This paper focuses on the performance of an innovative daylighting system named Modified Double Light Pipe (MDLP). It consists of a device integrating a Double Light Pipe (DLP) with a light shelf. The DLP has been created by the authors to enter daylight into two levels underground buildings. It involves an excessive bulk and the risk of glare in the passage environment. The MDLP is an attempt to solve these problems by coupling the DLP and the light shelf technologies. The authors used a numerical approach modeling the MDLP by the software Rhinoceros and simulating its performance by Grasshopper plugins Ladybug and Honeybee. After calibrating the software by the comparison between numerical and experimental data on the DLP, they carried out a numerical analysis on the MDLP in steady-state and dynamic conditions. In steady-state regime, the MDLP performs better than the DLP, giving quite a uniform illuminance distribution on the horizontal work plane. This is confirmed by the results of the dynamic analysis, carried out evaluating the metric Spatial Daylight Autonomy (sDA). Moreover, the risk of glare is avoided by the MDLP, thanks to the presence of the light shelf that prevents the observer from seeing the device directly.

CFD Hydrodynamic Analysis of a Torpedo Anchor Directional Stability

2010 ◽  
Author(s):  
Daniel Fonseca de Carvalho e Silva
Keyword(s):  
Steady State ◽  
Dynamic Analysis ◽  
Field Measurements ◽  
Hydrodynamic Performance ◽  
Vertical Position ◽  
Steady State Regime ◽  
Cfd Simulations ◽  
Hydrodynamic Analysis ◽  
Directional Stability ◽  
State Regime

The geometry of offshore anchors is usually determined from a geotechnical perspective. This paper presents the proposal of simple modifications on a torpedo anchor to improve its hydrodynamic performance concerning its directional stability. Additionally, the study of a real case torpedo deformation is presented. Although the directional stability investigation requires a dynamic analysis, the CFD simulations were performed on a steady state regime to show for which inclinations the anchor tends to recover the vertical position. The trajectory was investigated through a simplified dynamic model and compared with field measurements.

Dissipative and Generative Fractional Electric Elements in Modeling RC and RL Circuits

2021 ◽  
Author(s):  
Kristian Haška ◽  
Stevan Cvetićanin ◽  
Dušan Zorica
Keyword(s):  
Asymptotic Behavior ◽  
Steady State ◽  
Constitutive Equation ◽  
Magnetic Flux ◽  
Electromotive Force ◽  
Constitutive Models ◽  
Steady State Regime ◽  
Power Type ◽  
State Regime ◽  
Transient And Steady State

Abstract Generalized capacitor (inductor) is constitutively modeled by expressing charge (magnetic flux) in terms of voltage (current) memory as a sum of instantaneous and power type hereditary contributions and it is proved to be a dissipative electric element by thermodynamic analysis. On the contrary, generalized capacitor (inductor) as a generative electric element is modeled using the same form of the constitutive equation, but by expressing voltage (current) in terms of charge (magnetic flux) memory. These constitutive models are used in transient and steady state regime analysis of the series RC and RL circuits subject to electromotive force, as well as in the study of circuits' frequency characteristics including asymptotic behavior.

Integrated modelling of DEMO-FNS current ramp-up scenario and steady-state regime

2015 ◽  
Vol 55 (6) ◽  
pp. 063007 ◽  
Author(s):  
A.Yu. Dnestrovskij ◽  
B.V. Kuteev ◽  
A.S. Bykov ◽  
A.A. Ivanov ◽  
V.E. Lukash ◽  
...  
Keyword(s):  
Steady State ◽  
Integrated Modelling ◽  
Steady State Regime ◽  
Current Ramp ◽  
State Regime

On the Amplitude Analysis of MOS Differential LC Oscillators

2010 ◽  
Vol 47 (2) ◽  
pp. 95-103
Author(s):  
Luis Moura
Keyword(s):  
Steady State ◽  
Circuit Simulation ◽  
Piecewise Linear ◽  
Negative Resistance ◽  
Steady State Regime ◽  
Large Signal ◽  
Amplitude Analysis ◽  
Lc Oscillators ◽  
State Regime ◽  
Good Agreement

In this paper we discuss the application of the negative resistance concept to estimate the amplitude of oscillation of MOS differential LC oscillators in a steady-state regime. This is done by approximating the large-signal non-linearity, associated with the negative resistance, by a piecewise linear model. The analytical findings are in very good agreement with the results provided by transient circuit simulation.

scholarly journals Mixed-mode growth of a multicomponent precipitate in the quasi-steady state regime

2018 ◽  
Vol 2 (1) ◽  
Author(s):  
Tohid Naseri ◽  
Daniel Larouche ◽  
Rémi Martinez ◽  
Francis Breton
Keyword(s):  
Steady State ◽  
Mixed Mode ◽  
Quasi Steady State ◽  
Steady State Regime ◽  
State Regime
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