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Littérature scientifique sur le sujet « Self deployable »

Auteur : Grafiati
Publié le 26 mai 2023

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Articles de revues sur le sujet "Self deployable"

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Neogi, Depankar, Craig Douglas et David R. Smith. « Experimental Development of Self-Deployable Structures ». International Journal of Space Structures 13, no 3 (septembre 1998) : 157–69. http://dx.doi.org/10.1177/026635119801300305.

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Deployable space structures are prefabricated structures which can be transformed from a closed, compact configuration to a predetermined expanded form in which they are stable and can bear loads. The present research effort investigates a new family of deployable structures, called self-deployable structures. Unlike other deployable structures, which have rigid members and moving joints, the self-deployable members are flexible while the connecting joints are rigid. The joints store the predefined geometry of the deployed structure in the collapsed state. The self-deployable structure is stress-free in both deployed and collapsed configurations and results in a self-standing structure which acquires its structural properties after a chemical reaction. Reliability of deployment is one of the most important features of the self-deployable structure, since it does not rely on mechanisms that can lock during deployment. The unit building block of these structures is the self-deployable structural element. Several of these elements can be linked to generate more complex building blocks such as a triangular or tetrahedral structures. Different self-deployable structural element and self-deployable structure concepts are investigated in the present research work, and the performance of triangular and tetrahedral prototype structures are experimentally explored.
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Dwiana ; Anastasia Maurina, Yosafat Bakti. « MODULAR BAMBOO STRUCTURE DESIGN EXPLORATION WITH DEPLOYABLE CONSTRUCTION SYSTEM ». Riset Arsitektur (RISA) 3, no 04 (5 octobre 2019) : 381–97. http://dx.doi.org/10.26593/risa.v3i04.3521.381-397.

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Abstract- Deployable structure is a type of structure that can be transformed from a closed configuration to an open configuration. This structure can be assembled and disassembled with ease. This easy construction is a reason why deployable structure is the right structure for after disaster scenario. In emergency, natural resources are needed since it can be found and used easily. Bamboo is a common plant that can be found everywhere in Indonesia. Research have been done by UNPAR’s architecture lecturer regarding deployable structure (deployable spatial and deployable planar) with bamboo as its material. It says that deployable spatial structure has easier and shorter time in instalation than deployable planar structure. Deployable spatial structure has tons of room for development. Some development that can be done is to make deployable structure module to be duplicated in every direction, and to implement self locking mechanism in this structure. This research is done to find deployable structure module that can be duplicated in every direction, and also implementing self locking mechanism in this structure Method that used in this research is qualitative by comparing some buildings that implementing deployable system (Resiploy and Triangle Prism) and modular system (Rising Canes and Y-BIO). The comparastion result is opportunity and thread from each building. This result which is opportunity and thread from each building then synthesized to find criteria for deployable structure that can be duplicated in every direction. Based on the research, it can be concluded that in deployable structure, nut and bolt is needed so that some building element can be rotated to create a movement. In modular building, we need a simple system that can be used in every joint so that building can be duplicated in every way with ease. Reciprocal structure is needed to make a building with self locking mechanism. By simplifying Resiploy’s joint and using Rising Canes’s modules, we can make a deployable structure that can be duplicated in every way with self locking mechanism Key Words: bamboo structure, deployable, modular, self locking mechanism
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Lyu, Tian, Shan Qin, ZiAng Tian, QiYue Zhang, YunJing Xu et KeXin Lin. « Design of a Catapulted Self-deployable UAV ». Journal of Physics : Conference Series 2181, no 1 (1 janvier 2022) : 012042. http://dx.doi.org/10.1088/1742-6596/2181/1/012042.

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Abstract Unmanned Aerial Vehicle (UAV) is playing a gradually enhanced role in fields of recon and information acquisition, however restricted departure condition of fixed wing aircrafts, take-off preparation time of multirotor aircrafts etc. have limited its further applications. This research aims to combine advantage of hovering and self-deployable departure to reconcile the shortcomings, meanwhile adapts to drone swarm trend. A catapulted self-deployable quadrotor is designed using 3D modelling software, and later a compatible self-deployable control algorithm is developed using STM32F103 microcontroller, along with its circuitry. Eventually, a prototype of the design is 3D printed, assembled and tested. This design shows merits of easy to carry, low requirements for take-off conditions and good hovering performance and is compatible for multi-UAVs cooperation tendency.
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Bettini, William, Jérôme Quirant, Julien Averseng et Bernard Maurin. « Self-Deployable Geometries for Space Applications ». Journal of Aerospace Engineering 32, no 1 (janvier 2019) : 04018138. http://dx.doi.org/10.1061/(asce)as.1943-5525.0000967.

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del Grosso, Andrea E., et Paolo Basso. « Deployable Structures ». Advances in Science and Technology 83 (septembre 2012) : 122–31. http://dx.doi.org/10.4028/www.scientific.net/ast.83.122.

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Deployable structures have been developed for many different applications from space to mechanical and civil engineering. In the paper the general concepts of deployable structures, combining static and kinematic behaviour are presented first, also discussing their relationships with adaptive and variable geometry structures. Reported applications to civil engineering and architecture are then reviewed and categorized. The characteristics of the following systems are summarized : 1. Pneumatic Structures. 2. Tensegrity Structures. 3. Scissor-like Structures. 4. Rigid Foldable Origami. 5. Mutually Supported Structures. The problems of form finding, direct and inverse kinematics, actuation and self-deployability for some of the most interesting among the above structural types are then discussed in the paper. Some examples involving rigid foldable origami and mutually supported structures are finally presented.
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Cao, Xu, Yan Xu, Changhong Jiang, Qin Fang et Hao Feng. « Simulation Investigation of the Stowing and Deployment Processes of a Self-Deployable Sunshield ». International Journal of Aerospace Engineering 2021 (6 février 2021) : 1–14. http://dx.doi.org/10.1155/2021/6672177.

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The stowing and deployment processes of a self-deployable sunshield are investigated numerically in this paper. The composition of the self-deployable sunshield is described. Deployed moment theoretical models for lenticular booms are formulated based on the bending theory of curved shell. The numerical analysis method of deployed moment is proposed. Two types of control methods for a fold crease are presented, and a dynamic analysis model considering geometry and nonlinear contact is built. The analysis results indicate that the press flattening method can be used effectively for controlling the fold crease, and the analytical results of the deployed moment are very close to the theoretical results. A stowing and deployment process analysis of the self-deployable sunshield is conducted. Thus, the deployment configurations and the time history curves of the dynamic behaviors are obtained. The results verify the feasibility of the analysis model, and this study can provide technical support for the engineering application of the self-deployable sunshield.
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Mallikarachchi, H. M. Y. C., et S. Pellegrino. « Design of Ultrathin Composite Self-Deployable Booms ». Journal of Spacecraft and Rockets 51, no 6 (novembre 2014) : 1811–21. http://dx.doi.org/10.2514/1.a32815.

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Zheng, Yuanqing, Guobin Shen, Liqun Li, Chunshui Zhao, Mo Li et Feng Zhao. « Travi-Navi : Self-Deployable Indoor Navigation System ». IEEE/ACM Transactions on Networking 25, no 5 (octobre 2017) : 2655–69. http://dx.doi.org/10.1109/tnet.2017.2707101.

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Sokolowski, Witold M., et Seng C. Tan. « Advanced Self-Deployable Structures for Space Applications ». Journal of Spacecraft and Rockets 44, no 4 (juillet 2007) : 750–54. http://dx.doi.org/10.2514/1.22854.

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Jia, Bao Xian, Qing Cheng et Wen Feng Bian. « Design of Deployable Antenna Based on SMPC ». Advanced Materials Research 753-755 (août 2013) : 1457–61. http://dx.doi.org/10.4028/www.scientific.net/amr.753-755.1457.

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In order to get the deployable antenna with light weight but large size and high stiffness, this study investigated SMPC self-deployable driver mechanism based on the deformation mechanism of SMPC, and designed the SMPC space deployable antenna. The laminated shell structure with two pieces of back-to-back configuration was analyzed. Finite element analysis revealed that the reasonable central angle of the laminated shell cross-section was 90°. The ends fixing structure of the SMPC hinge was given. The function and structure of the hoop truss deployable antenna were designed to meet the functional and accuracy requirements.
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Thèses sur le sujet "Self deployable"

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Watt, Alan Morrison. « Deployable structures with self-locking hinges ». Thesis, University of Cambridge, 2003. https://www.repository.cam.ac.uk/handle/1810/272077.

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Stavroulakis, Georgios. « Rapidly deployable, self forming, wireless networks for maritime interdiction operations ». Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2006. http://library.nps.navy.mil/uhtbin/hyperion/06Sep%5FStavroulakis.pdf.

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Thesis (M.S. in Information Technology Management)--Naval Postgraduate School, September 2006.
Thesis Advisor(s): Alex Bordetsky. "September 2006." Includes bibliographical references (p. 79-81). Also available in print.
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Oueis, Jad. « Radio access and core functionalities in self-deployable mobile networks ». Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEI095/document.

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Les réseaux mobiles auto-déployables sont des réseaux qui peuvent être rapidement déployés, facilement installés, sur demande, n’importe où, et n’importe quand. Ils visent divers cas d’utilisation pour fournir des services aux utilisateurs lorsque le réseau classique ne peut pas être utilisé, ou n’existe pas : lors d’événements publics, lors des situations critiques, ou dans les zones isolées. Ces réseaux font évoluer l’architecture d’un réseau classique, en éliminant la séparation physique qui existe entre le réseau d’accès et le cœur de réseau. Cette séparation est désormais uniquement fonctionnelle, vu qu’une station de base est colocalisée avec les fonctionnalités du réseau de cœur, telles que la gestion de session et le routage, en plus des serveurs d’applications. Une station de base, toute seule, sans connexion à un réseau externe, fournit des services aux utilisateurs dans sa zone de couverture. Lorsque plusieurs stations de base sont interconnectées, les liens entre elles forment un réseau d’interconnexion, qui risque d’avoir une capacité limitée. Dans ce travail, nous nous appuyons sur les propriétés distinguant les réseaux auto-déployables pour revisiter des problèmes classiques du réseau d’accès dans ce nouvel contexte, mais aussi pour aborder de nouveaux défis créés par l’architecture du réseau. Tout d’abord, nous proposons un algorithme qui retourne un schéma d’allocation de fréquences et de puissances pour les stations de base. Celui-ci augmente considérablement les débits des utilisateurs par rapport aux schémas classiques de réutilisation de fréquences. Ensuite, nous traitons le problème de placement des fonctionnalités du cœur du réseau. Pour le placement centralisé, nous proposons une nouvelle métrique de centralité qui permet de placer les fonctions de façon à maximiser le trafic pouvant être échangé dans le réseau. Pour le placement distribué, nous évaluons le nombre de fonctions nécessaires et leur placement optimal, en tenant compte de l’impact sur la capacité du réseau d’interconnexion. Nous démontrons aussi les avantages du placement distribué par rapport au centralisé en terme de consommation de ressources sur le réseau d’interconnexion. Dans le même contexte, nous abordons le problème d’attachement des utilisateurs, lorsque les fonctionnalités du cœur de réseau sont distribuées, pour déterminer par laquelle de ces fonctionnalités un utilisateur est-il servi. Enfin, avec le réseau d’accès configuré et le cœur de réseau organisé, les utilisateurs commencent à arriver. Alors, nous abordons le problème de l’association des utilisateurs. Nous proposons une nouvelle politique d’association adaptée aux propriétés des réseaux auto-déployables. Cette politique réduit la probabilité de blocage par rapport aux politiques classiques basées uniquement sur la qualité de la voie descendante, en tenant compte à la fois des ressources du réseau d’accès, des ressources sur le réseau d’interconnexion, et des demandes des utilisateurs
Self-deployable mobile networks are a novel family of cellular networks, that can be rapidly deployed, easily installed, and operated on demand, anywhere, anytime. They target diverse use cases and provide network services when the classical network fails, is not suitable, or simply does not exist: when the network saturates during crowded events, when first responders need private broadband communication in disaster-relief and mission-critical situations, or when there is no infrastructure in areas with low population density. These networks are challenging a long-standing vision of cellular networks by eliminating the physical separation between the radio access network (RAN) and the core network (CN). In addition to providing RAN functionalities, such as radio signal processing and radio resource management, a base station can also provide those of the CN, such as session management and routing, in addition to housing application servers. As a result, a base station with no backhaul connection to a traditional CN can provide local services to users in its vicinity. To cover larger areas, several base stations must interconnect. With the CN functions co-located with the RAN, the links interconnecting the BSs form the backhaul network. Being setup by the BSs, potentially in an ad hoc manner, the latter may have a limited bandwidth. In this thesis, we build on the properties distinguishing self-deployable networks to revisit classical RAN problems but in the self-deployable context, and address the novel challenges created by the core network architecture. Starting with the RAN configuration, we propose an algorithm that sets a frequency and power allocation scheme. The latter outperforms conventional frequency reuse schemes in terms of the achieved user throughput and is robust facing variations in the number of users and their distribution in the network. Once the RAN is configured, we move to the CN organization, and address both centralized and distributed CN functions placements. For the centralized placement, building on the shortages of state of the art metrics, we propose a novel centrality metric that places the functions in a way that maximizes the traffic that can be exchanged in the network. For the distributed placement, we evaluate the number of needed instances of the CN functions and their optimal placement, considering the impact on the backhaul bandwidth. We further highlight the advantages of distributing CN functions, from a backhaul point of view. Accordingly, we tackle the user attachment problem to determine the CN instances serving each user when the former are distributed. Finally, with the network ready to operate, and users starting to arrive, we tackle the user association problem. We propose a novel network-aware association policy adapted to self-deployable networks, that outperforms a traditional RAN-based policy. It jointly accounts for the downlink, the uplink, the backhaul and the user throughput request
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Al-baidhani, Abbas. « Self-deployable positioning systems for emergency situations employing uwb radio technology ». Doctoral thesis, Universitat Autònoma de Barcelona, 2019. http://hdl.handle.net/10803/667752.

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Indoor positioning systems have been widely studied in the last decade due to the need of humans for them especially in the large building such as malls, airports, hospitals...etc. Still, there is no suitable precise indoor positioning system which can be implemented for different indoor environments and situations. We should mention military urban and emergency situations. In military urban and emergency response operations, the time is a crucial issue, and a precise positioning system with a clear indoor covering is a highly prerequisite tool to enhance safety. It should be seamless, low, frugal, power efficacious, low cost and supply less meter-level accuracy. In emergency scenarios, we don't have enough flexibility and time to install all anchor nodes in a proper situation that may help to obtain an appropriate accuracy for locating a mobile station, but command centers require observing their operational forces, and rescuers demand to detect potential victims to perform proper care. The most common users for these situations are the firefighters, police, military, and civilians. The main goal of this Ph.D. dissertation is to create an accurate indoor positioning (IP) system that could be used in different indoor environments and situation, especially for the emergency situation. So, we create this system through different steps as explained below. First, we have considered the study of different radio technologies to choose the suitable radio technology called Ultra wide band (UWB) radio technology. The reasons of selection the UWB and the commercial device that implements such technology are explained in details in chapters 3 and 4. Afterward, due to some impacts of the UWB in indoor environments (see chapters 4 and 5), we continue the study of NLOS identification and mitigation methods. In these chapters, we create two different NLOS identification and mitigation methods using a commercial UWB device experimentally. The first method used two parameters extracted from the UWB device to identify the propagation channel and map information of the building that the method is experimentally done in it to mitigate the NLOS channel. The second method of NLOS identification and mitigation used three parameters extracting from the UWB device to be an input set of the Fuzzy logic technique used to identify the propagation channels. In this identification method, it is not only to identify the prorogation channel to NLOS and LOS but also to divide the NLOS channel into hard and soft channels. Then, we created a database that includes the three parameters and the distance Bias to mitigate the NLOS channel for obtaining an accurately estimated distance to be used for creating an accurate IP system. Finally, with the aim of applying our designs to mass market applications, we move to create a novel IP system using the UWB technology called anchor selection (AS). In this technique, we focus on using fewer sensors (anchor nodes) to locate a mobile station under harsh circumstances such as scenarios where the installation area of the anchor nodes is narrow and/or the installation time should be very short. The proposed approach is based on grouping anchor nodes in different sets and evaluating the positioning error of each of these groups by means of a novel mean squared error (MSE)-based methodology. A virtual node approach is also proposed to consider the case where position must be computed with only two anchor nodes.
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Dahl, Marcus. « Design and Construction of a Self-Deployable Structure for the Moon House Project ». Thesis, KTH, Lättkonstruktioner, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-185024.

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This master thesis describes the design and construction of a prototype for the Moon House project. The goal was to develop a structural concept which ultimately will allow a 2 × 2.5 × 3 m3 house to be deployed on the surface of the Moon as an art installation. A 1 to 5 scale model was built and tested. Provided is background information on lightweight and inflatable technology for space applications. This is then reviewed together with earlier work related to the Moon House project in order to come up with a feasible design. The structure consists of a frame made out of plain-weave glass fiber tape springs. These are joined with plastic connectors and the frame is covered in a thin rip-stop polyester film. Elastic folds and pin-jointed hinges allow the structure to be folded, thus reducing its stowed volume. Deployment of the house is achieved with a combination of pressurization and elastically stored strain energy in the tape springs from folding of the structure. The tape springs have been tailored using specific lay-up and geometry to achieve an efficient folding scheme. The final structure was designed in Solid Edge and connectors were 3D-printed in plastic material. Deployment tests have been performed with partial success. Points of improvement have been identified and recommendations are made for future work.
Detta examensarbete behandlar design och konstruktion av en prototyp för Månhusprojektet. Målet var att ta fram ett strukturellt koncept för en stuga med dimensionerna 2 × 2, 5 × 3 m3 som skall kunna veckla ut sig själv på månens yta. En modell i skala 1 till 5 byggdes och testades. Rapporten innehåller bakgrundsinformation om olika konstruktioner, uppblåsbara och utfällningsbara, för rymdapplikationer. Detta utvärderas sedan, tillsammans med tidigare arbete relaterat till projektet, mot kravspecifikationer, f¨or att ta fram en ny design. Resultatet ¨ar en struktur bestående av s.k. “Tape springs” tillverkade i vävd glasfiber. De olika elementen kopplas samman med skarvar av plast. Detta utgör en ram, som sedan kläds med tunn rip-stop polyester. Elastiska veck kombinerat med mekaniska gångjärn gör att strukturen kan packas ihop till en mindre volym. Utfällning av strukturen möjliggörs med en kombination av trycksättning och elastiskt lagrad energi från den påtvingade vikningen. Genom att variera laminatens egenskaper och geometri fås strukturella element som ger ett effektivt vikningsschema. Strukturen togs fram med hjälp av Solid Edge ST6 och plastskarvarna 3D-printades. Test av utfällningen har gjorts med delvis lyckade resultat. Problem och potentiella förbättringar har identifierats och rekommendationer ges för fortsatt utveckling av konceptet.
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ACCETTURA, ANTONIO GABRIELE. « Self-deployable structures for advanced space applications : analysis, design and small scale testing ». Doctoral thesis, Università degli Studi di Roma "Tor Vergata", 2014. http://hdl.handle.net/2108/203118.

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The aim of this PhD project is to evaluate, design, manufacture and test Self- Deployable structures using a Shape Memory Composite (SMC) technology to be used on advanced space applications, including both small and large space structures such as solar sails, antennas, solar panels and de-orbiting systems. This technology can also enable innovative missions from debris capture to solar system exploration and more. In particular SMPs based mechanisms are here proposed, and feasibility is demonstrated by means of experimental tests targeted to show their suitability to space applications. After a review on space mechanisms and SMC applications, selected designs have been proposed and test campaigns have been performed, including material characterization and the deployment of small scale prototypes. Even if this is only a starting point, achieved results are in accordance with literature and provide an original contribution to the self-deployable structures for space applications.
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Mallikarachchi, H. M. Yasitha Chinthaka. « Thin-walled composite deployable booms with tape-spring hinges ». Thesis, University of Cambridge, 2011. https://www.repository.cam.ac.uk/handle/1810/239395.

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Deployable structures made from ultra-thin composite materials can be folded elastically and are able to self-deploy by releasing the stored strain energy. Their lightness, low cost due to smaller number of components, and friction insensitive behaviour are key attractions for space applications. This dissertation presents a design methodology for lightweight composite booms with multiple tape-spring hinges. The whole process of folding and deployment of the tape-spring hinges under both quasi-static and dynamic loading has been captured in detail through finite element simulations, starting from a micro-mechanical model of the laminate based on the measured geometry and elastic properties of the woven tows. A stress-resultant based six-dimensional failure criterion has been developed for checking if the structure would be damaged. A detailed study of the quasi-static folding and deployment of a tape-spring hinge made from a two-ply plain-weave laminate of carbon-fibre reinforced plastic has been carried out. A particular version of this hinge was constructed and its moment-rotation profile during quasi-static deployment was measured. Folding and deployment simulations of the tape-spring hinge were carried out with the commercial finite element package Abaqus/Explicit, starting from the as-built, unstrained structure. The folding simulation includes the effects of pinching the hinge in the middle to reduce the peak moment required to fold it. The deployment simulation fully captures both the steady-state moment part of the deployment and the final snap back to the deployed configuration. An alternative simulation without pinching the hinge provides an estimate of the maximum moment that could be carried by the hinge during operation. This moment is about double the snap-back moment for the particular hinge design that was considered. The dynamic deployment of a tape-spring hinge boom has been studied both experimentally and by means of detailed finite-element simulations. It has been shown that the deployment of the boom can be divided into three phases: deployment; latching, which may involve buckling of the tape springs and large rotations of the boom; and vibration of the boom in the latched configuration. The second phase is the most critical as the boom can fold backwards and hence interfere with other spacecraft components. A geometric optimisation study was carried out by parameterising the slot geometry in terms of slot length, width and end circle diameter. The stress-resultant based failure criterion was then used to analyse the safety of the structure. The optimisation study was focused on finding a hinge design that can be folded 180 degrees with the shortest possible slot length. Simulations have shown that the strains can be significantly reduced by allowing the end cross-sections to deform freely. Based on the simulations a failure-critical design and a failure-safe design were selected and experimentally verified. The failure-safe optimised design is six times stiffer in torsion, twice stiffer axially and stores two and a half times more strain energy than the previously considered design. Finally, an example of designing a 1 m long self-deployable boom that could be folded around a spacecraft has been presented. The safety of this two-hinge boom has been evaluated during both stowage and dynamic deployment. A safe design that latches without any overshoot was selected and validated by a dynamic deployment experiment.
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Friedman, Noémi. « Investigation of highly flexible, deployable structures : review, modelling, control, experiments and application ». Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2011. http://tel.archives-ouvertes.fr/tel-00675481.

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In this thesis, an extensive review on different transformable systems used in architecture and civil engineering is given. After the review, structures undergoing large displacements and instability phenomenon were highlighted. The main goal of the dissertation was to investigate the general behavior of a specific, immature self-deploying system, the antiprismatic structure proposed by Hegedus. The emphasis was mainly taken to the analysis of the packing behavior. First, a simplified planar model was identified sharing similar, highly nonlinear packing behavior. For both the 2D and the 3D structures numerical simulation of the packing was performed with different type of controls and the results were confirmed by analytical investigations. The research clarifies the mechanical behavior of the chosen system, provides tools to simulate the packing of the structure, options for control, and gives very simple approximations for main mechanical characteristics of the antiprismatic system in order to facilitate preliminary design and verification of the numerical results. The significance of snap-back behavior, occurring at the force-displacement diagram during packing was analyzed. Within the framework of the thesis a novel type of system, slightly deviating from the original one was also investigated. For the specific systems, small physical models were built and presented in this work, which led to the proposal of a novel type of expandable tube. An attempt was given to provide ideas for application of antiprismatic structures by combining the investigated system and different learnt existing systems from the architectural review.
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Clemmensen, John Scott Jr. « Design of a Control System for Multiple Autonomous Ground Vehicles to Achieve a Self Deployable Security Perimeter ». Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/34165.

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Due to the limitations of GPS in areas where line of sight to the sky is obstructed the development of a GPS-free algorithm for relative formation control is an asset to collaborative vehicles. This paper presents a novel approach based on the Received Signal Strength Indication (RSSI) measurement between broadcast and receive nodes to calculate distance and using the data transfer capability to allow each vehicle to develop a table of relative positions. These relative positions are used to create a potential field that results in an absolute minimum at the vehicles desired position. All vehicles are numbered sequentially. The numbering defines the order in which they will broadcast their data, as well as their position along the perimeter. This thesis looks at two control methods for achieving a formation. The first is the circular motion method that puts perimeter nodes in an orbit around around the perimeter center. The second is a gradient descent method that calculates the gradient of the potential field. Both methods achieve a formation when all perimeter nodes are at their absolute minimums in the potential field. Tests were conducted to analyze RSSI measurements using the 802.15.4 protocol, and a mathematical simulation was conducted for each control algorithm.
Master of Science
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Maetz, Xavier. « Développement et caractérisation expérimentale en microgravité de structures auto-déployables de réflecteurs paraboliques pour applications spatiales ». Electronic Thesis or Diss., Université de Montpellier (2022-....), 2022. http://www.theses.fr/2022UMONS084.

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La miniaturisation des satellites représente un défi technologique important pour l'accès à l'espace en réduisant les coûts et les délais de développement. L'augmentation considérable des lancements de nanosatellites est une preuve de leur intérêt dans de multiples applications. Les antennes paraboliques réflectrices sont largement utilisées pour des applications de télécommunication, d'observation de la terre, de navigation et de science (exploration de l'espace lointain). C'est la solution la plus utilisée pour des antennes satellitaires qui ont besoin d'un gain élevé, car elles possèdent un bon rendement et peuvent supporter n'importe quelle polarisation. En général, le diamètre d'une antenne à géométrie fixe va dépendre de la taille et de la capacité d'aménagement de la plateforme du satellite. Mais quand une antenne à géométrie fixe n'est pas envisageable, alors une architecture déployable est considérée. Avec les petits satellites comme les MicroSats et les CubeSats, une antenne parabolique doit obligatoirement être une structure déployable. Cette thèse réalisée au Laboratoire de Mécanique et Génie Civil (LMGC) de Montpellier, cofinancée par le Centre National d'Etudes Spatiales (CNES) et la région Occitanie, s'inscrit dans la continuité d'une collaboration entre le service mécanisme du CNES et la partie structure innovante de l'équipe SIGECO du LMGC. L'objectif est de proposer un concept de structure porteuse de réflecteurs auto-déployables à l'échelle des CubeSats. Ce sont des structures qui sont pliées pour obtenir une configuration gerbée compacte lors du lancement, et qui présentent une bonne tenue mécanique en configuration déployée. Le passage entre les deux configurations s'effectue uniquement par libération d'énergie élastique stockée dans des joints, sans apport d'énergie extérieure. Afin d'assurer le déploiement fiable et précis des mécanismes envisagés, il faut être capable de comprendre et de modéliser le comportement des structures. L'approche proposée associe donc modélisation, conception, prototypage et caractérisation expérimentale. Les travaux de cette thèse ont menés à la fabrication et l'intégration de deux prototypes de type EM (Engineering Model). Afin de valider le modèle de ces réflecteurs, les prototypes ont été déployés et testés dans en environnement de microgravité, pendant une campagne de 3 vols paraboliques
The miniaturization of satellites represents a significant technological challenge for access to space by reducing costs and development times. The considerable increase in nanosatellite launches is a proof of their interest in multiple applications. Reflective parabolic antennas are widely used for telecommunication, earth observation, navigation and science (deep space exploration) applications. It is the most used solution for satellite antennas that need high gain, because they have good performance and can support any polarization. In general, the diameter of a fixed geometry antenna will depend on the size and layout capability of the satellite platform. But when a fixed geometry antenna is not possible, then a deployable architecture is considered. With small satellites like MicroSats and CubeSats, a satellite parabolic antenna must be a deployable structure. This thesis carried out at the Laboratory of Mechanics and Civil Engineering (LMGC) in Montpellier, co-financed by the National Center for Space Studies (CNES) and the Occitanie region, is part of the collaboration between the mechanism department of CNES and the innovative structure part of the SIGECO team of the LMGC. The objective is to propose a concept of structure for self-deployable reflectors on the scale of CubeSats. These structures are folded to obtain a compact stacked configuration during launch, and have good mechanical strength in the deployed configuration. The passage between the two configurations is carried out only by the release of elastic energy stored in the joints, without any external energy input. In order to ensure the reliable and precise deployment of the mechanisms, it is necessary to be able to understand and model the behavior of the structures. The proposed approach combines modeling, design, prototyping and experimental characterization. The work of this thesis led to the fabrication and integration of two EM (Engineering Model) prototypes. In order to validate the model of these reflectors, the prototypes were deployed and tested in a microgravity environment, during a campaign of 3 parabolic flights
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Livres sur le sujet "Self deployable"

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Berteaux, Henri O. Self deployable deep sea moorings. Woods Hole, Mass : Woods Hole Oceanographic Institution, 1992.

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Cold Hibernated Elastic Memory Structure : Self-Deployable Technology and Its Applications. Taylor & Francis Group, 2018.

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Sokolowski, Witold M. Cold Hibernated Elastic Memory Structure : Self-Deployable Technology and Its Applications. Taylor & Francis Group, 2018.

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Sokolowski, Witold M. Cold Hibernated Elastic Memory Structure : Self-Deployable Technology and Its Applications. Taylor & Francis Group, 2018.

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Sokolowski, Witold M. Cold Hibernated Elastic Memory Structure : Self-Deployable Technology and Its Applications. Taylor & Francis Group, 2018.

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Sokolowski, Witold M. Cold Hibernated Elastic Memory Structure : Self-Deployable Technology and Its Applications. Taylor & Francis Group, 2018.

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[Conceptual design of a self-deployable, high performance, parabolic concentrator for advanced solar-dynamic power systems : Final technical report]. [Washington, DC : National Aeronautics and Space Administration, 1991.

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Chapitres de livres sur le sujet "Self deployable"

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Weder, Benjamin, Uwe Breitenbücher, Kálmán Képes, Frank Leymann et Michael Zimmermann. « Deployable Self-contained Workflow Models ». Dans Service-Oriented and Cloud Computing, 85–96. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-44769-4_7.

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Kanemitsu, Tomomi, Shinji Matsumoto, Haruyuki Namba, Takanori Sato, Hisato Tadokoro, Takao Oura, Kenji Takagi, Shigeru Aoki et Nobuyuki Kaya. « Self-Deployable Antenna Using Centrifugal Force ». Dans IUTAM-IASS Symposium on Deployable Structures : Theory and Applications, 173–82. Dordrecht : Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-015-9514-8_19.

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Wu, Chenshu, Zheng Yang et Yunhao Liu. « Self-Deployable Peer-to-Peer Navigation ». Dans Wireless Indoor Localization, 109–36. Singapore : Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0356-2_6.

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Bujakas, V. I., et A. A. Kamensky. « Self-setting Locks for Petal Type Deployable Space Reflector ». Dans Mechanisms and Machine Science, 177–87. Cham : Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-45387-3_16.

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Szyszkowski, W., et K. Fielden. « Controlling the Performance and the Deployment Parameters of a Self-Locking Satellite Boom ». Dans IUTAM-IASS Symposium on Deployable Structures : Theory and Applications, 405–14. Dordrecht : Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-015-9514-8_42.

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Knap, Lech, Andrzej Świercz, Cezary Graczykowski et Jan Holnicki-Szulc. « The Concepts of Telescopic and Self-Deployable Tensegrity-Based Helium-Filled Aerostats ». Dans Lecture Notes in Mechanical Engineering, 157–65. Singapore : Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-6049-9_11.

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Neogi, D., et C. D. Douglas. « 83. Development of a self-deployable structural element for space truss applications ». Dans Space Structures 4, 1 : 772–782. Thomas Telford Publishing, 1993. http://dx.doi.org/10.1680/ss4v1.19683.0083.

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Basu, Soumya Sankar. « A Self-Organized Software Deployment Architecture for a Swarm Intelligent MANET ». Dans Advances in Computational Intelligence and Robotics, 348–73. IGI Global, 2015. http://dx.doi.org/10.4018/978-1-4666-8291-7.ch011.

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A class of self-organizing readily deployable network (MANET: Mobile Ad-hoc Network) has been developed to address applications such as distributed collaborative computing, disaster recovery, and digital battlefield. Some of these applications need collaboration software running in the network to help in their mission. Because of the inherent nature of MANET, collaborative software application deployment has not been easy. Researchers have focused on those challenges like minimizing power, computing and memory utilization, and routing. With advancement of high-end devices, power, computing, and memory is not much of a constraint now. Mobility is still a challenge and is a major inhibitor for researchers to think about software application deployment architecture on MANET. This chapter proposes a self-organized software deployment architecture by which any 3-tier application can be deployed in a MANET. After the application is deployed, this chapter also enhances the previously proposed adaptive movement influenced by swarm intelligent principles.
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Jones, Roselin. « Lifetime Maximization of Target-Covered WSN Using Computational Swarm Intelligence ». Dans Advances in Wireless Technologies and Telecommunication, 383–425. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-7335-7.ch018.

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In target-covered WSN, all critical points (CPs) are to be monitored effectively. Even a single node failure may cause coverage hole reducing the lifetime of the network. The sensor has non-rechargeable battery, and hence, energy supervision is inevitable. To maximize the lifetime of the WSN with guaranteed coverage and effective battery utilization, the activities of the sensors are to be scheduled and also the sensors may be repositioned towards the critical points. This chapter proposes an energy-efficient coverage-based artificial bee colony optimization (EEC-ABC) approach that exploits the intelligent foraging behavior of honeybee swarms to solve EEC problem to maximize the lifetime of the WSN. It also adheres to quality of service metrics such as coverage, residual energy, and lifetime. Similarly, energy-balanced dynamic deployment (EB-DD) optimization approach is proposed to heal the coverage hole to maximize the lifetime of the WSN. It positions the self-deployable mobile sensors towards the CPs to balance their energy density and thus enhances the lifetime of the network.
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Actes de conférences sur le sujet "Self deployable"

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Zirbel, Shannon A., Mary E. Wilson, Spencer P. Magleby et Larry L. Howell. « An Origami-Inspired Self-Deployable Array ». Dans ASME 2013 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/smasis2013-3296.

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The objective of this paper is to show the development of a compact, self-deploying array based on the tapered map fold. The tapered map fold was modified by applying an elastic membrane to one side of the array and adequately spacing the panels adjacent to valley folds. Through this approach, the array can be folded into a fully dense volume when stowed. The panels are dimensioned to account for the panel thickness when folded, which otherwise would prevent the model from reaching a fully dense form. The folding motion is achieved by creating a rigid-foldable model of the origami-inspired crease pattern. The paper discusses a variety of approaches for creating rigid origami from the map fold, including pleat hinges and spacer panels. The tapered map fold is rigid-foldable through the incorporation of tapered spacer panels. By choosing appropriate values for the angles and tapered spacer panel dimensions, the tapered map fold is fully dense when stowed. The tapered spacer panels also enable the model to have a single degree of freedom of actuation. Stored strain energy in the elastic membrane enables self-actuation of the model. Applying a membrane also simplifies fabrication of the array. Potential applications for the array include a collapsible solar array, or other military or backpacking applications.
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You, Zhong, et Nicholas Cole. « Self-Locking Bi-Stable Deployable Booms ». Dans 47th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference
14th AIAA/ASME/AHS Adaptive Structures Conference
7th. Reston, Virigina : American Institute of Aeronautics and Astronautics, 2006. http://dx.doi.org/10.2514/6.2006-1685.

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Tuna, Turcan, Salih Ertug Ovur, Etka Gokbel et Tufan Kumbasar. « FOLLY : A Self Foldable and Self Deployable Autonomous Quadcopter ». Dans 2018 6th International Conference on Control Engineering & Information Technology (CEIT). IEEE, 2018. http://dx.doi.org/10.1109/ceit.2018.8751883.

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Mintchev, S., L. Daler, G. L'Eplattenier, L. Saint-Raymond et D. Floreano. « Foldable and self-deployable pocket sized quadrotor ». Dans 2015 IEEE International Conference on Robotics and Automation (ICRA). IEEE, 2015. http://dx.doi.org/10.1109/icra.2015.7139488.

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Wilson, Mary E., Spencer P. Magleby, Larry L. Howell et Anton E. Bowden. « Characteristics of Self-Deployment in Origami-Based Systems ». Dans ASME 2019 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/detc2019-98126.

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Abstract The potential of compliant mechanisms and related origami-based mechanical systems to store strain energy make them ideal candidates for applications requiring an actuation or deployment process, such as space system arrays, minimally invasive surgical devices and deployable barriers. Many origami structures can be thought of as a compliant mechanism because, like compliant mechanisms, its function is performed through the elastic deformation of its members. This stored strain energy could prove useful. There are opportunities using strain energy to develop approaches to deploy particular mechanical systems. In order to better understand the principles of self-actuation and promote the designs of such systems, a taxonomy of deployable origami mechanisms is presented. This taxonomy demonstrates that there are several different types of deployable origami mechanisms and provides an organizational method to better understand the design space. Characteristics of self deployment in concentrated, deployable origami strain energy mechanisms with internal actuation are identified and examples of strain energy based deployment are provided.
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Pehrson, Nathan A., Daniel C. Ames, Spencer P. Magleby et Brian Ignaut. « Design and Analysis of Self-Deployable, Self-Stiffening, and Retractable Arrays ». Dans AIAA Scitech 2020 Forum. Reston, Virginia : American Institute of Aeronautics and Astronautics, 2020. http://dx.doi.org/10.2514/6.2020-1543.

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Pehrson, Nathan A., Sam P. Smith, Daniel C. Ames, Spencer P. Magleby et Manan Arya. « Self-Deployable, Self-Stiffening, and Retractable Origami-Based Arrays for Spacecraft ». Dans AIAA Scitech 2019 Forum. Reston, Virginia : American Institute of Aeronautics and Astronautics, 2019. http://dx.doi.org/10.2514/6.2019-0484.

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Ferraro, Serena, et Sergio Pellegrino. « Self-Deployable Joints for Ultra-Light Space Structures ». Dans 2018 AIAA Spacecraft Structures Conference. Reston, Virginia : American Institute of Aeronautics and Astronautics, 2018. http://dx.doi.org/10.2514/6.2018-0694.

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Sokolowski, Witold, Seng Tan, Paul Willis et Mark Pryor. « Shape memory self-deployable structures for solar sails ». Dans Smart Materials, Nano-and Micro-Smart Systems, sous la direction de Nicolas H. Voelcker et Helmut W. Thissen. SPIE, 2008. http://dx.doi.org/10.1117/12.814301.

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Bahr, Ryan, Abdullah Nauroze, Wenjing Su et M. M. Tentzeris. « Self-Actuating 3D Printed Packaging for Deployable Antennas ». Dans 2017 IEEE 67th Electronic Components and Technology Conference (ECTC). IEEE, 2017. http://dx.doi.org/10.1109/ectc.2017.186.

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Rapports d'organisations sur le sujet "Self deployable"

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Crane Ill, Carl D. The Theoretical Analysis of Self-Deployable Tensegrity Structures. Fort Belvoir, VA : Defense Technical Information Center, février 2004. http://dx.doi.org/10.21236/ada424114.

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