Relation Between Full-Scale and Model Data

2020 ◽  
Author(s):  
Horia Hangan ◽  
Maryam Refan ◽  
Djordje Romanic
Keyword(s):  
Numerical Simulations ◽  
State Of The Art ◽  
Full Scale ◽  
The State ◽  
Reduced Model ◽  
Model Data ◽  
Model Simulations ◽  
Velocity Scale ◽  
Scale Data

This chapter introduces recent results aiming to compare full-scale data and simulations of tornadoes and to establish a framework through which simulations of tornado-like vortices (both physical and numerical) can be compared to full-scale data. Physical and sometimes numerical simulations of non-synoptic winds such as tornadoes and downbursts are performed at a reduced (model) scale (Λl) compared to reality (prototype). That approach implies that there is also a timescale (Λt) and a velocity scale (Λv) involved, and the three of them are interlinked. The proper determination of these scales is critical in the process of translating results from model simulations to reality. This chapter discusses the state of the art of determining these scales for two types of non-synoptic winds—tornadoes and downbursts.

Problem of angular motion control of a non-cooperative on-orbit service object

2021 ◽  
Vol 2021 (1) ◽  
pp. 37-50
Author(s):  
A.A. Fokov ◽  
◽  
O.P. Savchuk ◽  
Keyword(s):  
Motion Control ◽  
State Of The Art ◽  
Object Motion ◽  
The State ◽  
Angular Motion ◽  
Motion Parameter ◽  
Rotary Motion ◽  
Parameter Determination ◽  
Service Object

The realization of existing projects of on-orbit servicing and the development of new ones is a steady trend in the development of space technology. In many cases, on-orbit service clients are objects that exhibit an undesired rotary motion, which renders their servicing difficult or impossible. The problem of on-orbit service object motion control determines the topicality of studies aimed not only at the refinement of methods and algorithms of controlling both the translational and the rotary motion of an object, but also at the development and refinement of methods of onboard determination of the object – service spacecraft relative motion parameters. This paper overviews the state of the art of the problem of object motion parameter determination in on-orbit servicing tasks and existing methods of object motion control and angular motion damping and specifies lines of further investigations into the angular motion control of non-cooperative service objects. Based on the analysis of publications on the subject, the applicability of onboard means for object motion parameter determination is characterized. The analysis of the applicability of methods of remote determination of the parameters of an unknown non-cooperative object from a service spacecraft shows that they are at the research stage. The input data for the verification of methods proposed in the literature were simulated or taken from ground experiments or previous missions. Contact and contactless methods of angular motion control of non-cooperative on-orbit service objects are considered. From the state of the art of investigations into the contactless motion control of on-orbit service objects it may be concluded that the most advanced contactless method of motion control of an on-orbit service object is a technology based on the use of an ion beam directed to the object from an electrojet engine onboard a service spacecraft. Lines of further investigations into non-cooperative object motion control are proposed.

Determination of textile dyeing wastewater COD components by comparison with respirometry and full‐scale data

2010 ◽  
Vol 31 (11) ◽  
pp. 1191-1201 ◽  
Author(s):  
Jing‐Jie Yu ◽  
Guo‐Wei Gu ◽  
Giovanni Esposito ◽  
Massimiliano Fabbricino ◽  
Shao‐Po Wang ◽  
...  
Keyword(s):  
Full Scale ◽  
Dyeing Wastewater ◽  
Textile Dyeing ◽  
Scale Data ◽  
Textile Dyeing Wastewater

Determination of the Wave Spectrum From Observed Motions of a Vehicle in a Seaway

1967 ◽  
Vol 11 (03) ◽  
pp. 199-208
Author(s):  
Wilbur Marks
Keyword(s):  
Wave Spectrum ◽  
Full Scale ◽  
The State ◽  
Vertical Acceleration ◽  
Time Histories

If, during full-scale trials, it is not possible to measure the state of the sea with a reliable wavemeter, then certain motion records may be combined to achieve the same end. The derivation of the wave spectrum from the time histories of pitch, heave (vertical acceleration), and bow immersion is presented. The problem of the conversion of acceleration to displacement is discussed. The method is applied to the particular case of the hydrofoil boat Sea Legs.

scholarly journals Saga of Superfluid Solids

Physics ◽  
2020 ◽  
Vol 2 (1) ◽  
pp. 49-66 ◽  
Author(s):  
Vyacheslav I. Yukalov
Keyword(s):  
Numerical Simulations ◽  
State Of The Art ◽  
Theoretical Models ◽  
The State ◽  
Experimental Results ◽  
Standing Problem

The article presents the state of the art and reviews the literature on the long-standing problem of the possibility for a sample to be at the same time solid and superfluid. Theoretical models, numerical simulations, and experimental results are discussed.

Destructive Tests for the Determination of Masonry Performance

2009 ◽  
Vol 417-418 ◽  
pp. 753-756
Author(s):  
Lucio Nobile ◽  
Cristina Gentilini ◽  
Veronica Bartolomeo ◽  
Mario Bonagura
Keyword(s):  
Mechanical Properties ◽  
Experimental Research ◽  
State Of The Art ◽  
The State ◽  
Masonry Walls ◽  
Compression Tests ◽  
Diagonal Compression

Several masonry panels are studied by means of destructive tests such as compressive, diagonal compression and shear-compression tests. The experimental research allows to characterize the mechanical properties of masonry walls in order to assess the masonry performance. Moreover, a brief recall of the most important experimental progress is presented in order to understand the state of the art of the research in the field of destructive tests.

scholarly journals Compilación y análisis de la Literatura Kogi

2012 ◽  
Vol 9 ◽  
pp. 9
Author(s):  
Zulma Martínez Preciado ◽  
Liliana Moreno Muñoz
Keyword(s):  
Key Words ◽  
Representative Sample ◽  
State Of The Art ◽  
The State ◽  
Literary Production ◽  
Indigenous Literature ◽  
Palabras Clave ◽  
Literature Anthologies ◽  
Myth Criticism

Resumen:El artículo, visibiliza el potencial simbólico de algunas formas compositivas Kogi, que se abren paso en el panorama de la literatura indígena colombiana. Para ello, se recopilaron textos teóricos, críticose investigativos; así como antologías de literatura kogi, y se hizo el análisis a partir de la mitocrítica. Las fases fundamentales del proyecto fueron: indagación acerca del estado del arte respecto a la literatura kogi; recopilación de producción literaria kogi y determinación de formas compositivas y funciones; y selección y análisis de una muestra representativa de la producción literaria kogi, en la que se tuvieron en cuenta algunos motivos arquetípicos recurrentes. Palabras clave: literatura indígena colombiana, kogis, literatura kogi, cultura kogi, mitocrítica, motivos arquetípicos.Resumo:O artigo faz visível o potencial simbólico de algumas formas compositivas Kogi que ganham espaço no panorama da literatura indígena colombiana. Para isso foram recopilados textos teóricos, críticos e investigativos, assim como antologias de literatura Kogi, e foi feita a análise partindo da microcrítica. As fases fundamentais do projeto foram: indagação sobre o estado da arte respeito à literaturaKogi, recopilação de produção literária Kogi e determinação de formas compositivas e funções; e seleção e análise de uma mostra representativa da produção literária Kogi, na qual foram tidos comconsideração alguns motivos arquetípicos. Palavras chave: literatura indígena colombiana, kogis, literatura kogi, cultura kogi, microcrítica, motivos arquetípicos.Abstract:The article, makes visible the symbolic potential of some Kogi compositional forms that make their way  into the landscape of the Colombian indigenous literature. To do this, we collected theoretical texts, critical and research as well as literature anthologies kogi, and the analysis was based on the myth criticism. The key stages of the project were: inquiry about the state of the art with respect to literature kogi; kogi literary collection and determination of compositional forms and functions; and selection and analysis ofa representative sample of kogi literary production, in wich took into account some recurring archetypal motifs. Key words: Colombian indigenous literature, kogis, kogi literature, kogi culture, myth criticism, archetypal motifs.

Determination of Riser Tensioner Properties From Full-Scale Data

2008 ◽  
Author(s):  
Himanshu Gupta ◽  
Vincenzo Nava ◽  
Hugh Banon ◽  
Vasileios Gkaras ◽  
Pol Spanos
Keyword(s):  
Full Scale ◽  
Design Parameters ◽  
Small Scale ◽  
Offshore Platforms ◽  
Production Facility ◽  
Deepwater Risers ◽  
Scale Data ◽  
Permanent Production ◽  
Tree Production

Tensioners are used for supporting various kinds of production and drilling risers on offshore platforms. All permanent production facilities (such as TLP’s and Spar’s) have employed tensioners to support their dry tree production risers. The key design parameters for the tensioners design are stiffness, stroke and friction properties. Full scale onshore testing of production riser tensioners to determine tensioner properties is difficult due to the magnitude of the loads and pressures required for typical deepwater risers, thus designers frequently rely on theoretical values or small scale tests. This paper presents a determination of riser tensioner properties from full scale offshore observations made on the Holstein Spar production facility during 2005 hurricance season. The paper presents a model for the tensioner system that relates the properties needed by platform and riser designers to the physical tensioner systems. The methodology and results from extraction of parameters from the full scale data is presented. The results presented in this paper will provide a better insight to the designers of such systems.

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