Mobile Ad-Hoc network is a distributed wireless network that is self-organized and self-maintained and it doesn’t require a fixed framework or central administration. Wireless nodes in a mobile ad ...hoc network are transient and have a short lifespan. They combine to form a self-configured, infrastructure-free network where routing is a significant difficulty. The wireless nodes in the network must synchronize in order to decide connectivity and routing. Ad hoc network synchronization includes activities including node organization, neighborhood detection, and routing. The predetermined framework resulted in an increase in network control overhead. If a node can link to every other node in the network, it is referred to as a dominating node, and a set of dominating nodes make up the dominating set. The main purpose of this article is to lessen routing overhead in the wireless network with the dominating set based routing (DSBR). In order to discover routes, shorten reroute establishment times, and increase packet delivery rates, this research presents an energy-efficient routing algorithm (EERA) that considerably increases the network performance. The effectiveness of this technique is demonstrated by the simulation analysis of the outcome.
Geotechnical earthquake engineers have been trying to determine the most appropriate solution techniques for ground response analysis under earthquake loadings. This paper presents the importance of ...the adequate soil behavior model to simulate earthquake site response analysis. The influence of nonlinearity and linearity of soils on the site response is also investigated. Many methods have been proposed for the analysis of one-dimensional ground response such as nonlinear methods and equivalent linear with reduced modulus. Using 13 well known earthquake records and geotechnical information of sand in the Qeshm Island (Iran) and classification of earthquakes based on seismic parameters, the influence of each parameter on the Response spectra and Fourier Spectrum of surface of ground becomes evident. Analysis was done using two softwares; EERA (equivalent linear analysis) and NERA (nonlinear analysis) and compared. Finally, output of the software is compared with the reference result on site.
To address the energy-efficient (EE) routing problem in software-defined wireless sensor networks (SDWSNs), in this study, a centralised routing algorithm, namely, the interference-aware EE routing ...algorithm (IA-EERA), is proposed to extend the network lifetime (NL) in SDWSNs. Both the link quality of service requirements and the balance between the link energy loads are considered in the proposed IA-EERA when selecting the EE relays. Concretely, the IA-EERA comprises the EE relay selection (RS) and the centralised relay scheduling schemes, which are responsible for generating a valid link set with RS priorities and scheduling the eligible relay nodes with expected link rates from the valid link set, respectively. For supporting the network compatibility and scalability, we propose a hierarchical SDWSN based network architecture, upon which the IA-EERA can be devoted to solving the EE routing problem in the relay layer of SDWSN. Simulation results show that for one data source without interference, the proposed IA-EERA can significantly improve the NL compared with the traditional routing algorithm utilising the energy efficiency maximisation. For multiple data sources incurring interference at nodes, the IA-EERA is able to reduce the NL-dropping rate by adjusting the interference-aware parameter that affects the RS priorities
A planning tool for clustering and optimised grid connection of offshore wind farms is presented and described in some detail. This tool is suitable for high level, strategic planning of clustering ...and grid connection of future offshore wind farms that are planned in the proximity of each other. This tool is an upgraded version of a previously developed tool for offshore grid expansion planning. The use of the upgraded tool is demonstrated with an example that considers the Kriegers Flak area, with results indicating benefits of interconnecting wind farms across country borders and using a hybrid AC and DC transmission system to shore.
This interview with Arkadiy Margolis, the first vice-rector of MSUPE, focuses on the issues related to the recently acquired membership of the Russian Educational Research Association in the European ...Educational Research Association (EERA). The Moscow State University of Psychology and Education played an important part in this process which enables Russian researchers to access the entire space of European educational research, to increase their publishing activity, and to participate in foreign international conferences. Also, this means support for young researchers allowing them, for instance, to take part in international schools for young scholars and to acquire new knowledge about modern research tools and design in educational research. All this became possible after a year and a half of hard work of improving ethical requirements and codes of research. MSUPE’s participation in the activities of the Educational Research Association corresponds with the University’s interest in promoting research which became obvious during the development and implementation of the innovative programme of education – the one that won the National Competition for Priority Project in Education all the way back in 2008.
В интервью с первым проректором МГППУ Аркадием Ароновичем Марголисом освещены вопросы, связанные с вступлением Российской ассоциации исследователей образования в Европейскую ассоциацию (EERA). Стоит отметить большую роль Московского государственного психолого- педагогического университета в этом событии, которое дает российским ученым доступ в единое европейское пространство исследований, повышение публикационной активности, доступ к зарубежным и международным конференциям, а также поддержку молодых исследователей, в частности возможность участия в международных научных школах для молодых ученых, восполнения дефицита знаний современных инструментов и дизайна научных исследований образования. Этому событию предшествовали полтора года напряженной работы, направленной на гармонизацию уставных, этических требований к проведению исследований. Участие МГППУ в деятельности ассоциации исследователей образования является логичным продолжением интереса к развитию научных исследований, который исторически возник во время реализации и разработки инновационной программы образования, с которой университет победил в конкурсе национального приоритетного проекта в области образования еще в 2008 году.
In order to quantitatively study the seismic absorption effect of the cushion on a superstructure, a numerical simulation and parametric study are carried out on the overall FEA model of a rigid-pile ...composite foundation in ABAQUS. A simulation of a shaking table test on a rigid mass block is first completed with ABAQUS and EERA, and the effectiveness of the Drucker-Prager constitutive model and the finite-infinite element coupling method is proved. Dynamic time-history analysis of the overall model under frequent and rare earthquakes is carried out using seismic waves from the El Centro, Kobe, and Bonds earthquakes. The different responses of rigid-pile composite foundations and pile-raft foundations are discussed. Furthermore, the influence of thickness and modulus of cushion, and ground acceleration on the seismic absorption effect of the cushion are analyzed. The results show that： 1） the seismic absorption effect of a cushion is good under rare earthquakes, with an absorption ratio of about 0.85; and 2） the seismic absorption effect is strongly affected by cushion thickness and ground acceleration.
In this publication, the authors present methodology and example results for the analysis of ancillary services of an offshore wind farm cluster and its electrical power system. Thereby the operation ...tool Wind Cluster Management System (WCMS) is used as simulation tool to evaluate certain planning scenarios. Emphasis is made on two topics: 1) the integration of high voltage direct current (HVDC) technology to the WCMS, 2) the ancillary service analysis. As examples, voltage source converter based HVDC (VSC-HVDC) and the provision of reserve respectively balancing power are discussed in detail. The analyzed study case considers the Kriegers Flak area while the associated power system connects wind farms to Sweden, Denmark and Germany.
Aeroelastic instability may occur in aircraft during flight, therefore their prediction represents an important issue within aerospace engineering. Experimental aeroelasticity is still an important ...field in providing the tools to validate and understand instability phenomena analysis. As many industrial practices require fast evaluations of critical conditions, e.g. flight flutter testing, there exists a natural demand for on-line aeroelastic identification. A number of different methods have been proposed to characterize systems, but recently those showing most success for on-line identification have been based on subspace approaches. The eigensystem realization algorithm (ERA) represents one of the first subspace methods for identification, with the advantage of dealing with multi-input, multi-output data. However, its need for repeated application of the singular value decomposition and a dependence on impulse response functions implies limitations to on-line identification. Generalization studies of the ERA method have led to recursive forms of that algorithm. A recursive form closely related to ERA has been developed in terms of a modified batch estimation approach, and it is denoted as the extended eigensystem realization algorithm (EERA). This work presents results on the application of extended EERA method viewing on-line aeroelastic parameters identification of an experimental apparatus in the wind tunnel. Designed to reproduce the conditions for typical section aeroelastic behavior, an apparatus has been used to show the EERA capabilities in identifying on-line aeroelastic frequency and damping parameters. Results have shown that the approach is robust and adequate for aeroelastic characterization during experimental activities.
Identification of flutter parameters for a wing model De Marqui Junior, Carlos; Rebolho, Daniela C.; Belo, Eduardo M. ...
Journal of the Brazilian Society of Mechanical Sciences and Engineering,
09/2006, Letnik:
28, Številka:
3
Journal Article
Odprti dostop
A flexible mounting system has been developed for flutter tests with rigid wings in wind tunnel. The two-degree-of freedom flutter obtained with this experimental system can be described as the ...combination of structural bending and torsion vibration modes. Active control schemes for flutter suppression, using a trailing edge flap as actuator, can be tested using this experimental setup. Previously to the development of the control scheme, dynamic and aeroelastic characteristics of the system must be investigated. Experimental modal analysis is performed and modes shape and frequencies are determined. Then, wind tunnel tests are performed to characterize the flutter phenomenon, determining critical flutter speed and frequency. Frequency response functions are also obtained for the range of velocities below the critical one showing the evolution of pitch and plunge modes and the coupling tendency with increasing velocity. Pitch and plunge data obtained in the time domain during these tests are used to evaluate the ability of the Extended Eigensystem Realization Algorithm to identify flutter parameter with increasing velocity. The results of the identification process are demonstrated in terms of the evolution of frequency and danininv of the motley involved in flutter
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