Altres
http://hdl.handle.net/2117/15797
Tue, 24 May 2016 13:59:29 GMT2016-05-24T13:59:29ZEstudio de las distribuciones de las antenas de radar de barrido electrónico
http://hdl.handle.net/2117/87278
Estudio de las distribuciones de las antenas de radar de barrido electrónico
de los Reyes, Elías; Ferrando, Miguel; Jofre Roca, Lluís; Elias Fusté, Antonio
Tue, 24 May 2016 13:42:48 GMThttp://hdl.handle.net/2117/872782016-05-24T13:42:48Zde los Reyes, ElíasFerrando, MiguelJofre Roca, LluísElias Fusté, AntonioPresentación del Dpt. TSC. la electrónica de defensa ante el reto de Europa
http://hdl.handle.net/2117/87277
Presentación del Dpt. TSC. la electrónica de defensa ante el reto de Europa
Elias Fusté, Antonio
Tue, 24 May 2016 13:25:43 GMThttp://hdl.handle.net/2117/872772016-05-24T13:25:43ZElias Fusté, AntonioLa electrónica y los actuales sistemas defensivos
http://hdl.handle.net/2117/87276
La electrónica y los actuales sistemas defensivos
Elias Fusté, Antonio
Tue, 24 May 2016 13:09:25 GMThttp://hdl.handle.net/2117/872762016-05-24T13:09:25ZElias Fusté, AntonioSimulation studies of optimal decentralized load-frequency regulators
http://hdl.handle.net/2117/87275
Simulation studies of optimal decentralized load-frequency regulators
Bertran Albertí, Eduardo; Herranz, J.; Munilla, I.
On appliying the theory of the Optimal Decentralized Regulator (ODR) to the control of an Electric Power System (EPS), due attention has not been paid to some aspects such as the importance of the design model structure, the feasibility of reducing the generating unit efforts by penalizing the transient loop of the speed regulators deviations, and the application of the ODR only to en area with low capacity relative to the pool. In this paper, the importance of the external equivalent load in an area ODR design structure is studied, both analitically and by simulation, comparing the Calovic / Siljak structure and the Hiyama structure. Taking into account the real state of the EPS, the classical assumption that an ODR is implemented in each area is rejected; instead it is applied only in a low capacity area, using for the rest PI regulators. In a second part of this paper, the feasibility of reduce the generating efforts is considered by including in the model the transient loop (
Tue, 24 May 2016 12:58:41 GMThttp://hdl.handle.net/2117/872752016-05-24T12:58:41ZBertran Albertí, EduardoHerranz, J.Munilla, I.On appliying the theory of the Optimal Decentralized Regulator (ODR) to the control of an Electric Power System (EPS), due attention has not been paid to some aspects such as the importance of the design model structure, the feasibility of reducing the generating unit efforts by penalizing the transient loop of the speed regulators deviations, and the application of the ODR only to en area with low capacity relative to the pool. In this paper, the importance of the external equivalent load in an area ODR design structure is studied, both analitically and by simulation, comparing the Calovic / Siljak structure and the Hiyama structure. Taking into account the real state of the EPS, the classical assumption that an ODR is implemented in each area is rejected; instead it is applied only in a low capacity area, using for the rest PI regulators. In a second part of this paper, the feasibility of reduce the generating efforts is considered by including in the model the transient loop (On the use of state-feedback in the design of elementary switching regulators
http://hdl.handle.net/2117/87274
On the use of state-feedback in the design of elementary switching regulators
Bertran Albertí, Eduardo; Martínez Barrios, Luis; Poveda López, Alberto
The dc-to-dc buck switching converter is modelled by means of the State-Space Averaging Method and techniques of Modern Control Theory are applied to obtain a class of state-feedback control laws. Three different strategies in the design of the control loop are then investigated. Namely, closed-loop pole assignment, optimal linear regulator and adaptive control. Predicting the transient response by means of simulation allows the comparison among the performances of the different strategies. The obtained results can be used in the optimum design of elementary switching regulators.
Tue, 24 May 2016 12:53:45 GMThttp://hdl.handle.net/2117/872742016-05-24T12:53:45ZBertran Albertí, EduardoMartínez Barrios, LuisPoveda López, AlbertoThe dc-to-dc buck switching converter is modelled by means of the State-Space Averaging Method and techniques of Modern Control Theory are applied to obtain a class of state-feedback control laws. Three different strategies in the design of the control loop are then investigated. Namely, closed-loop pole assignment, optimal linear regulator and adaptive control. Predicting the transient response by means of simulation allows the comparison among the performances of the different strategies. The obtained results can be used in the optimum design of elementary switching regulators.Multiplicadores de frecuencia para receptores coherentes de microondas
http://hdl.handle.net/2117/87273
Multiplicadores de frecuencia para receptores coherentes de microondas
Corbella Sanahuja, Ignasi; Berenguer Sau, Jordi; Pradell i Cara, Lluís; Comerón Tejero, Adolfo; Bará, J; Artal, E
The design of frequency multipliers using PLL techniques is presented in this article. The theory is dicussed and also experimental results of a x43 frequency multiplier with an output frequency of 11.4 GHz in wich excellent performance has been achieved.
Tue, 24 May 2016 12:47:43 GMThttp://hdl.handle.net/2117/872732016-05-24T12:47:43ZCorbella Sanahuja, IgnasiBerenguer Sau, JordiPradell i Cara, LluísComerón Tejero, AdolfoBará, JArtal, EThe design of frequency multipliers using PLL techniques is presented in this article. The theory is dicussed and also experimental results of a x43 frequency multiplier with an output frequency of 11.4 GHz in wich excellent performance has been achieved.PLL de microondas con tiempo de adquisición reducido
http://hdl.handle.net/2117/87272
PLL de microondas con tiempo de adquisición reducido
Berenguer Sau, Jordi; Artal, E.; Corbella Sanahuja, Ignasi; Comerón Tejero, Adolfo
The behaviour of a PLL where the VCO is injection-locked to the reference frequency is studied. It is experimentally shown that the phase acquisition time can be reduced relative to the non-injection locked VCO situation.
At the same time, the phase relationship between an injection-locked oscillator and the reference oscillator can also be fixed.
These techniques can be applied to the local oscillators synthesis in a coherent receiver for the 12.5, 20 and 30 GHz beacons of the Olympus satellite.
Tue, 24 May 2016 12:45:46 GMThttp://hdl.handle.net/2117/872722016-05-24T12:45:46ZBerenguer Sau, JordiArtal, E.Corbella Sanahuja, IgnasiComerón Tejero, AdolfoThe behaviour of a PLL where the VCO is injection-locked to the reference frequency is studied. It is experimentally shown that the phase acquisition time can be reduced relative to the non-injection locked VCO situation.
At the same time, the phase relationship between an injection-locked oscillator and the reference oscillator can also be fixed.
These techniques can be applied to the local oscillators synthesis in a coherent receiver for the 12.5, 20 and 30 GHz beacons of the Olympus satellite.Failure investigation of a Francis turbine under the cavitation conditions
http://hdl.handle.net/2117/87268
Failure investigation of a Francis turbine under the cavitation conditions
Liu, Xin; Wang, Zhengwei; Zhou, Lingjiu; Escaler Puigoriol, Francesc Xavier
Acoustic-Structural coupling methodology has been used to numerically investigate the failure of a Francis turbine runner that broke down within one day of operation. The goal of the work has been to determine the feasibility of a resonance condition under cavitating flow conditions. The obtained results prove that the presence of large vapor cavities increase the natural frequencies of the diametrical modes of vibration in comparison with the pure water condition. In particular, a possible tuning between the hydrodynamic excitation and the 4ND mode has been found.
Tue, 24 May 2016 11:29:08 GMThttp://hdl.handle.net/2117/872682016-05-24T11:29:08ZLiu, XinWang, ZhengweiZhou, LingjiuEscaler Puigoriol, Francesc XavierAcoustic-Structural coupling methodology has been used to numerically investigate the failure of a Francis turbine runner that broke down within one day of operation. The goal of the work has been to determine the feasibility of a resonance condition under cavitating flow conditions. The obtained results prove that the presence of large vapor cavities increase the natural frequencies of the diametrical modes of vibration in comparison with the pure water condition. In particular, a possible tuning between the hydrodynamic excitation and the 4ND mode has been found.On the Partition Dimension and the Twin Number of a Graph
http://hdl.handle.net/2117/87267
On the Partition Dimension and the Twin Number of a Graph
Hernando Martín, María del Carmen; Mora Giné, Mercè; Pelayo Melero, Ignacio Manuel
A partition of the vertex set of a connected graph G is a locating partition of G if every vertex is uniquely determined by its vector of distances to the elements of . The partition dimension of G is the minimum cardinality of a locating partition of G . A pair of vertices u;v of a graph G are called twins if they have exactly the same set of neighbors other than u and v . A twin class is a maximal set of pairwise twin vertices. The twin number of a graph G is the maximum cardinality of a twin class of G . In this paper we undertake the study of the partition dimension of a graph by also considering its twin number. This approach allows us to obtain the set of connected graphs of order n 9 having partition dimension n
Tue, 24 May 2016 10:33:18 GMThttp://hdl.handle.net/2117/872672016-05-24T10:33:18ZHernando Martín, María del CarmenMora Giné, MercèPelayo Melero, Ignacio ManuelA partition of the vertex set of a connected graph G is a locating partition of G if every vertex is uniquely determined by its vector of distances to the elements of . The partition dimension of G is the minimum cardinality of a locating partition of G . A pair of vertices u;v of a graph G are called twins if they have exactly the same set of neighbors other than u and v . A twin class is a maximal set of pairwise twin vertices. The twin number of a graph G is the maximum cardinality of a twin class of G . In this paper we undertake the study of the partition dimension of a graph by also considering its twin number. This approach allows us to obtain the set of connected graphs of order n 9 having partition dimension nDesign strategies for biomimetic bone implants from calcium phosphate cements (Part 1)
http://hdl.handle.net/2117/87266
Design strategies for biomimetic bone implants from calcium phosphate cements (Part 1)
Canal Barnils, Cristina; Español Pons, Montserrat; Ginebra Molins, Maria Pau
Tue, 24 May 2016 10:28:26 GMThttp://hdl.handle.net/2117/872662016-05-24T10:28:26ZCanal Barnils, CristinaEspañol Pons, MontserratGinebra Molins, Maria Pau