An Analytic Model for Flow Control Schemes in Communication Network Nodes

1984 ◽  
Vol 32 (9) ◽  
pp. 1013-1019 ◽  
Author(s):  
P. Harrison
Sensors ◽  
2019 ◽  
Vol 19 (22) ◽  
pp. 4895
Author(s):  
Maurício R. Silva ◽  
Elitelma S. Souza ◽  
Pablo J. Alsina ◽  
Deyvid L. Leite ◽  
Mateus R. Morais ◽  
...  

This paper presents a communication network for a squadron of unmanned aerial vehicles (UAVs) to be used in the scanning rocket impact area for Barreira do Inferno Launch Center—CLBI (Rio Grande do Norte, Brazil), aiming at detecting intruder boats. The main features of communication networks associated with multi-UAV systems are presented. This system sends information through Wireless Sensor Networks (WSN). After comparing and analyzing area scanning strategies, it presents the specification of a data communication network architecture for a squadron of UAVs within a sensor network using XBee Pro 900HP S3B modules. A brief description is made about the initial information from the construction of the system. The embedded hardware and the design procedure of a dedicated communication antenna to the XBee modules are presented. In order to evaluate the performance of the proposed architecture in terms of robustness and reliability, a set of experimental tests in different communication scenarios is carried out. Network management software is employed to measure the throughput, packet loss and other performance indicators in the communication links between the different network nodes. Experimental results allow verifying the quality and performance of the network nodes, as well as the reliability of the communication links, assessing signal received quality, range and latency.


2014 ◽  
Vol 596 ◽  
pp. 653-658 ◽  
Author(s):  
Ning Zhe Xing ◽  
Jia Qi Guo ◽  
Ran Yu

Reliable power network can provide reliable operation of electric power for dispatching communication security, due to many key network nodes external connectivity in the electric power communication network has only one path, so once the link damage because of emergencies, these networks because of the failure of nodes (or communication link) and power operation scheduling of exception can occur easily, thus to cause great damage to the safe operation of the whole power network. In order to improve the robustness of system in this case, this paper designed a new optimization algorithm based on the equivalent network to simplify the real network and the network analysis.


Author(s):  
А.Г. Гудков

Целью работы является дополнение и уточнение методик, приведенных в действующей нормативно-методической базе, для инженерного расчета схем регулирования расходов в сетях дождевого водоотведения. Методом математического моделирования с применением системы компьютерной алгебры проанализированы три схемы регулирования, включающие емкости, насосы и разделительные камеры. Предложена универсальная расчетная формула определения объема регулирующего резервуара в схеме регулирования с опорожнением емкости насосами для всех типов разделительных камер. Установлены зависимости и приведены графики, показывающие влияние на величину объема резервуара коэффициента, который учитывает непостоянство расхода, отводимого разделительной камерой в коллектор. Для схемы регулирования без насоса и разделительной камеры подобрана степенная аппроксимирующая функция, позволяющая проводить расчет величины объема с приемлемой точностью, без численного интегрирования. Для двух схем регулирования с опорожнением самотеком предложены новые формулы определения объема регулирующего резервуара в широких диапазонах коэффициентов регулирования и параметров дождей. Приведены уточненные таблицы, упрощающие инженерные расчеты регулирующих резервуаров. Предложенные в работе формулы и таблицы позволяют рассчитывать емкость резервуаров для всех рекомендуемых схем регулирования расходов. The work aims at supplementing and clarifying the methods given in the current regulatory and methodological framework for the engineering calculation of flow control schemes in storm sewer networks. By the method of mathematical modeling using a computerized algebra system, three control schemes are analyzed, including tanks, pumps and separation chambers. A universal calculation formula for determining the capacity of an intermediate storage tank in a control scheme with emptying the tanks by pumps is proposed for all types of separation chambers. Dependencies are established and graphs are presented that show the effect on the tank capacity of a coefficient that takes into account the variations of the flow discharged by the separation chamber into the sewer. For the control scheme without a pump and a separation chamber, an exponential approximating function has been selected that allows calculating the capacity value with acceptable accuracy, without numerical integration. For two control schemes with gravity emptying, new formulas are proposed for determining the capacity of an intermediate storage tank in wide ranges of control coefficients and rain parameters. Amended tables are given that simplify the engineering calculations of intermediate storage tanks. The formulas and tables proposed in the paper allow calculating the capacity of tanks for all the recommended flow control schemes.


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