In this article, a new approach is proposed to design robust switching gain-scheduled dynamic output feedback control for switched uncertain continuous-time linear parameter varying (LPV) systems. The proposed robust switching gain-scheduled controllers are robustly designed so that the stability and H2-gain performance of the switched closed-loop uncertain LPV system can be guaranteed even under controller switching determined by scheduling parameters. Hysteresis switching law is exploited for the switching controller synthesis. The system matrices are supposed to depend polynomially on both the scheduling and uncertain parameters which are assumed to belong to intervals with a priori known bounds. The proposed approach is formulated in terms of solutions to a set of parameter-dependent LMIs using parameter searches for two scalar values. Finally, the method is applied to electromagnetic suspension system to verify the applicability of the presented approach.

In this paper a robust autopilot is designed for a low altitude and short range interceptor. Operating point is selected with v-gap metric tool and robust static H∞ loop shaping controller is designed for the linearized model. Propose method does not use gain scheduling approach and guarantees stability of the interceptor’s nonlinear dynamics in the whole flight envelope. Also an algorithm is proposed in order to reduce complexity synthesis of the weights in the loop shaping controller. In this algorithm the weights are optimized in order to maximize the robust stability margin. It is shown that robust stability margin which achieved by the controller can guarantee the stability of interceptor in the whole flight envelope.

In this paper a robust autopilot is designed using fuzzy gain scheduling. At first the flight envelop is divided to sub regions using v-gap metric and a suitable operating point is selected in each region and robust static H∞ loop shaping controller is designed for the linearized model. Finally, fuzzy gain scheduling is used to interpolate the local controllers. Simulation results show the generality and effectiveness of the proposed control strategy in terms of the performance and robustness of the system.

In this article, a new method is proposed to design robust dynamic output feedback control for switched uncertain continuous-time linear parameter varying (LPV) systems. The system matrices are supposed to depend on both the time-varying scheduling and uncertain parameters. Hysteresis switching law is exploited for the switching controller synthesis. Firstly, the robust switching controllers are robustly designed so that the stability and the induced L2-gain performance of the switched closed-loop uncertain LPV system can be guaranteed. The usual switching logics can cause discontinuous chattering control signal which are not acceptable in a practical situation. Accordingly, a smooth switching strategy for control design has been tackled in the following. By utilizing an independent family of parameter-dependent Lyapunov matrices and slack variables, performance improvement is achieved when compared to the previous works. The proposed method is formulated in terms of solutions to a set of parameter-dependent LMIs using the presented iterative algorithm. Finally, an inverted pendulum on a cart is illustrated to verify the advantages of the presented approach.

Integrated management with emphasis on combination of biocontrol agents and resistant varieties can be one of the efficient strategies to manage the pests. In this study, the effect of susceptible ('Orange') and resistant ('Tea') rose cultivars on demographic parameters of the rose aphid, Macrosiphum rosae (L.) (Hem.: Aphididae), and its predatory lady beetle Hippodamia variegata (Goeze) (Col.: Coccinellidae) was determined under laboratory conditions. The obtained data were analysed according to the age-stage, two-sex life table theory, the means, as well as the standard errors of all parameters, were estimated by the bootstrap procedure. Mean developmental time of immature stages (nymphal period) of the aphid on the resistant cultivar (15.20 days) was significantly higher than the susceptible one (9.53 days). The intrinsic rate of increase (r) of the rose aphid on the susceptible and resistant cultivars was 0.330 and 0.115 day-1, respectively. Furthermore, the values of the intrinsic rate of increase (r) of the predator fed on the aphids reared on the susceptible and resistant cultivars was 0.145 versus 0.126 day-1, respectively. The total pre-oviposition period (TPOP) of the lady beetle on the resistant cultivar (26.66 days) was significantly longer than that on the susceptible one (23.83 days), but total fecundity on the resistant cultivar (370.34 eggs/female) was significantly lower than that on the susceptible cultivar (451.65 eggs/female). According to obtained results, considering the lower intrinsic rate of increase (r) and fecundity of the predator on the resistant rose cultivar ('Tea'), more attention should be devoted for integrated control of rose aphids using resistant cultivars and predatory lady beetles.

This paper has proposedý ýa gain-scheduled controllerý with stability proof and guaranteed cost for a turboshaft driving a variable pitch propellerýý. ýIn order to overcome the complexity of the nonlinear modelý, a linear parameter varying (LPV) model is proposed for the first time which is in affine form.ý Proposed model is established based on a family of local linear models and is suitable for LPV gain scheduling methodsý. Thus a gain scheduled design procedure is proposed which considers parameter dependent Lyapunov matrices to ensure stability and a quadratic cost function for guaranteed performance of the closed loop systemýý. Proposed procedure also has the advantage of considering an upper bound for change rate of the scheduling signal which decreases conservativeness. ýController design problem and calculating its gain matrices is formulated in a set of Linear Matrix Inequalitiesý which easily can be solved using LMILAB toolbox. Simulation results showed the effectiveness and practicality of the proposed procedure.

Root and foot rot caused by Phytophthora drechsleri is an important disease of cucumber in field and greenhouse. One of the best control methods of the disease is use of resistant cucumber cultivars or grafting cucumber plants on resistant cucurbit rootstocks. In the present study, resistance of fourteen cucurbit and cucumber cultivars at different growth stages was evaluated in greenhouse conditions using a completely randomized design in two replications. Susceptibility of cultivars was assessed by percentage of dead plants. Cultivars showed different responses to the disease and were classified into five very susceptible, susceptible, moderately susceptible, moderately resistant and resistant groups. Cucurbit cultivars Kadu Halvaee and Kadu Khoreshti Toopor va Kootah, and cucumber cultivars Boskoo and Dastgerdi with 100, 100, 99.30 and 92.34 percentage of dead plants, respectively were very susceptible and cucurbit hybrids RS841, RS107 and RS152 and Kadu Tanbal cucurbit cultivar with 23.60, 20.12, 15.03 and 10.18 percentage of dead plants, respectively were resistant.

In this paper, a three-dimensional robust guidance law for a surface to air missile considering actuator saturation and first order dynamic for autopilot system has been designed in order to enhance the performance of defense systems. To attain this goal, first, modeling of the system in 3D spherical coordination using engagement basics has been derived and after that, appropriate cost function for collision of missile and target considering actuator constraints and in absence of target maneuver information has been formulated. Hamilton-Jacobi-Isaacs (HJI) differential equation inequality should be solved according to robust control literature for achieving guidance law which unfortunately does not have closed form solution in our case study problem. Therefore, to overcome this challenge, using adaptive dynamic programming theory for solving acquired HJI, algorithm for designing robust guidance law has been presented. Simplification solving of differential inequality and also guaranteeing robustness of the controller are the most important feature of the proposed algorithm. Numerous simulations for targets with different maneuvering capabilities and comparison of the proposed method with conventional augmented proportional navigation, show effectiveness of designed 3D robust guidance law.

In this paperý, ýthe concept of synchronization control along with robust H∞ control are considered to evaluate the seismic response control on multi-story structuresý. ýTo show the accuracy of the novel algorithmý, ýa five-story structure is evaluated under the EL-Centro earthquake loadý. ýIn order to find the performance of the novel algorithmý, ýrandom and uncertainty processes corresponding to Riccati equation is solved under a specific dynamicý. ýTime history graphs corresponding to maximum displacement and floors force control are presented and evaluatedý. ýDespite the existence of random process and uncertainty in structureý, ýstability and optimal performances are shown.

The Tomato Leaf Miner (TLM), Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae), is a cosmopolitan tomato pest that has driven a renewed reliance on pesticides in tomato production, negatively affecting biological control of other pests and creating environmental and health hazards. We tested five locally important Iranian tomato cultivars (TD, Karon, Petoprid, Matin, and 8320) for constituitive resistance to TLM by comparing its biological performance and life table parameters under standardized laboratory conditions (27.5±1°C, 65±5% RH, 16 L:8 D hours photoperiod). Survival and developmental rates of immature stages varied significantly among cultivars, as did female fecundity and main parameters of the life table. Karon was most suceptible, affording 90% juvenile TLM survival, the fastest development, and the highest female fecundity, with cultivar 8320 not significantly different in these regards. By contrast, Matin ranked most resistant; i.e. only 59% of larvae survived, and female fecundity was almost halved. TD was the next most resistant, being not significantly different from Matin in these metrics. The intrinsic rates of increase (r), in descending order, were Karon (0.178), 8320 (0.169), TD (0.146), Petoprid (0.138), and Matin (0.111). Matin and TD had the highest densities of glandular trichomes on adaxial leaf surfaces. These findings indicate that the Matin, Petoprid and TD are more resistant than the other cultivars and have potential as one component of an IPM strategy to manage T. absoluta.