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- 저자 : Angel Cuenca (검색결과 4 건)
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A Non-Uniform Predictor-Observer for a Networked Control System
Angel Cuenca,Pedro García,Pedro Albertos,Julián Salt 제어·로봇·시스템학회 2011 International Journal of Control, Automation, and Vol.9 No.6
This paper presents a Non-Uniform Predictor-Observer (NUPO) based control approach in order to deal with two of the main problems related to Networked Control Systems (NCS) or Sensor Networks (SN): time-varying delays and packet loss. In addition, if these delays are longer than the sampling period, the packet disordering phenomenon can appear. Due to these issues, a (scarce) non-uniform, delayed measurement signal could be received by the controller. But including the NUPO proposal in the control system, the delay will be compensated by the prediction stage, and the non-available data will be reconstructed by the observer stage. So, a delay-free, uniformly sampled controller design can be adopted. To ensure stability, the predictor must satisfy a feasibility problem based on a time-varying delay-dependent condition expressed in terms of Linear Matrix Inequalities (LMI). Some aspects like the relation between network delay and robustness/performance trade-off are empirically studied. A simulation example shows the benefits (robustness and control performance improvement) of the NU-PO approach by comparison to another similar proposal.
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Angel Cuenca,Julián Salt,Vicente Casanova,Ricardo Pizá 제어·로봇·시스템학회 2010 International Journal of Control, Automation, and Vol.8 No.2
This paper presents a control strategy to face time-varying delays induced in a Networked Control System (NCS). The delay is divided into two parts: the largest one (an integer multiple of the bus cycle) is compensated by means of an adaptive multi-rate Smith predictor, and the smallest one (whose value is strictly smaller than the bus cycle) via a gain scheduling approach based on root locus contour and linearization techniques. The gains to be scheduled belong to a multi-rate PID controller. Control system stability is studied by means of Lyapunov theory. Simulation results and the implementation on a test-bed Profibus-DP environment illustrate that this control structure can maintain NCS performance and stability, despite the considered delays.
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Mary-Rus Martínez-Cuenca,Maria Angeles Forner-Giner,Amparo Primo-Capella 한국원예학회 2021 Horticulture, Environment, and Biotechnology Vol.62 No.3
This work evaluates new citrus hybrid tolerance to salt stress compared to Carrizo citrange. Growth parameters, ion concentration,photosynthetic parameters, leaf water relation, plant damage and proline concentration were assessed in plantsirrigated with 0 (control) or 60 mM of NaCl for 60 days. Some hybrids presented marked salt-stress symptomatology likesharp decreases in plant biomass and RGR parameter, and high leaf burn and abscission percentages. While Cl − accumulationin most salinised genotypes was recorded in all the plant fractions, accumulation occurred in some hybrids only in their aerialorgans. Stomatal conductance also lowered under salt conditions in all the hybrids, whereas the internal CO 2 concentration(Ci) tended to increase. Salt stress lowered the leaf water potentials in all the 0501 hybrids. As a response, the salinisedplants induced proline accumulation. The main trait that improved salt tolerance in some genotypes is apparently linked withthe imbalance among Cl − , Na + and K + ions, especially enhanced K + uptake and transport rates which delay plant damage.
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Mary-Rus Martínez-Cuenca,Amparo Primo-Capella,Maria Angeles Forner-Giner 한국원예학회 2019 Horticulture, Environment, and Biotechnology Vol.60 No.4
This work compared the expression of the main B transport-related genes (some members of the aquaporin family - NIP5 , TIP5 and PIP1 - and some effl ux-B transporters - BOR1 and BOR4 -), and the response of some physiological parameters in two citrus species [ Citrus macrophylla W. (CM) and Citrus aurantium L. (CA)] under moderate and low boron (B) conditions. Seedlings were cultured “in vitro” in media supplemented with 50 or 0 μM H 3 BO 3 . NIP5 , BOR1 and PIP1 expressions were enhanced by low B levels in both genotypes. TIP5 was down-regulated in the roots and leaves of the CA0 seedlings, and in the roots of CM0. BOR4 also lowered in the roots of both species at 0 μM H 3 BO 3 . Consequently, citrus species showed a common tolerance mechanism to low B conditions based on the synergism among transport channel NIP5, non-selective aquaporin PIP1 and transporter BOR1, and the impairment of genes TIP5 and BOR4 related with tolerance responses to B-toxic conditions. However, the CA genotype displayed low B symptoms earlier than CM (reduced plant biomass, length, relative growth rate and chlorophyll content). Proline concentration was higher in CM0 than in CA0 leaves, while the latter also enhanced malonaldehyde content. Although both plants had similar B concentrations, they diff ered in B content and B partitioning fractions. Whereas the CA genotype was more aff ected by lack of B treatment as more B was needed inside the cell, the more minimal need of cell B in CM favoured its allocation in the insoluble fraction and allowed growth in this genotype. In conclusion, B compartmentalisation seems critical in tolerance to low B level in citrus.
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