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.

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.

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.

Mapping, localization and motion planning in mobile multi-robotic systems

Robotica ◽  
2012 ◽  
Vol 31 (1) ◽  
pp. 1-23 ◽  
Author(s):  
William Rone ◽  
Pinhas Ben-Tzvi
Keyword(s):  
Motion Planning ◽  
System Design ◽  
Motion Control ◽  
State Of The Art ◽  
Simultaneous Localization And Mapping ◽  
Robotic System ◽  
The State ◽  
Robotic Systems ◽  
System Research ◽  
Localization And Mapping

SUMMARYAs researchers have pushed the limits of what can be accomplished by a single robot operating in a known or unknown environment, a greater emphasis has been placed on the utilization of mobile multi-robotic systems to accomplish various objectives. In transitioning from a robot-centric approach to a system-centric approach, considerations must be made for the computational and communicative aspects of the group as a whole, in addition to electromechanical considerations of individual robots. This paper reviews the state-of-the-art of mobile multi-robotic system research, with an emphasis on the confluence of mapping, localization and motion control of robotic system. Methods that compose these three topics are presented, including areas of overlap, such as integrated exploration and simultaneous localization and mapping. From these methods, an analysis of benefits, challenges and tradeoffs associated with multi-robotic system design and use are presented. Finally, specific applications of multi-robotic systems are also addressed in various contexts.

Focus on speciation assessment in marine radiochemistry using X-ray absorption spectroscopy

2018 ◽  
Vol 42 (10) ◽  
pp. 7582-7591 ◽  
Author(s):  
Maria Rosa Beccia ◽  
Pier Lorenzo Solari ◽  
Marguerite Monfort ◽  
Christophe Moulin ◽  
Christophe Den Auwer
Keyword(s):  
Absorption Spectroscopy ◽  
State Of The Art ◽  
The State ◽  
X Ray ◽  
Recent Advances ◽  
X Ray Absorption

We review the state-of-the-art and recent advances in the determination of radionuclide speciation in seawater.

scholarly journals Isothiazolinone Biocides: Chemistry, Biological, and Toxicity Profiles

Molecules ◽  
2020 ◽  
Vol 25 (4) ◽  
pp. 991 ◽  
Author(s):  
Vânia Silva ◽  
Cátia Silva ◽  
Pedro Soares ◽  
E. Manuela Garrido ◽  
Fernanda Borges ◽  
...  
Keyword(s):  
Chemical Stability ◽  
Analytical Methods ◽  
State Of The Art ◽  
The State ◽  
Present Review ◽  
Chemical Additives ◽  
Eu Legislation ◽  
Structure Activity

The importance of isothiazole and of compounds containing the isothiazole nucleus has been growing over the last few years. Isothiazolinones are used in cosmetic and as chemical additives for occupational and industrial usage due to their bacteriostatic and fungiostatic activity. Despite their effectiveness as biocides, isothiazolinones are strong sensitizers, producing skin irritations and allergies and may pose ecotoxicological hazards. Therefore, their use is restricted by EU legislation. Considering the relevance and importance of isothiazolinone biocides, the present review describes the state-of-the-art knowledge regarding their synthesis, antibacterial components, toxicity (including structure–activity–toxicity relationships) outlines, and (photo)chemical stability. Due to the increasing prevalence and impact of isothiazolinones in consumer’s health, analytical methods for the identification and determination of this type of biocides were also discussed.

The Determination of Flux Residue Safety: The State of the Art

Circuit World ◽  
1994 ◽  
Vol 20 (4) ◽  
pp. 26-32 ◽  
Author(s):  
B.N. Ellis
Keyword(s):  
State Of The Art ◽  
The State
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