This paper deals with the robust tracking control problem for a class of partial information MIMO LTV systems, which is a common case in practical engineering. Since only a finite number of discrete characteristic tim...
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ISBN:
(纸本)9781424451920;9781424451937
This paper deals with the robust tracking control problem for a class of partial information MIMO LTV systems, which is a common case in practical engineering. Since only a finite number of discrete characteristic time points during the whole operating region of the system could be measured, multi-linear model approximation approach is employed. Based on H ¿ theory, a sufficient criteria is proposed to construct the global robust controller, which could guarantee the global stability of the multi-linear system. An important contribution of this method is that it provides a simple and feasible approach for the design of multi-linear systems which could easily guarantee both the global stability and robustness of the closed-loop systems. This method is applied to the design of a BTT (bank-to-turn) missile autopilot and the simulation results show the effectiveness of this method.
A new tuning method for designing fractional order PID controllers based on radial basis function (RBF) neural networks is presented in this paper. Though fractional order PID controllers can provide better control fo...
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A new tuning method for designing fractional order PID controllers based on radial basis function (RBF) neural networks is presented in this paper. Though fractional order PID controllers can provide better control for dynamical systems, the difficulties of designing them increase. This paper deals with the design of fractional order PID controllers by first using an existed tuning method, and then taking advantage of good approximation ability of RBF neural networks to establish a mapping relationship between plant parameters and the parameters of fractional order PID controller. The greatest advantage of this method is that the controller could be easily obtained from plant parameters with good performance of closed-loop system. Simulation results for both integer-order plant and fractional-order plant show the proposed method is highly effective.
The public goods game is a powerful metaphor for exploring the maintenance of social cooperative behavior in a group of interactional selfish players. Here we study the emergence of cooperation in the public goods gam...
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The public goods game is a powerful metaphor for exploring the maintenance of social cooperative behavior in a group of interactional selfish players. Here we study the emergence of cooperation in the public goods games with diverse contributions in finite populations. The theory of stochastic process is innovatively adopted to investigate the evolutionary dynamics of the public goods games involving a diversity of contributions. In the limit of rare mutations, the general stationary distribution of this stochastic process can be analytically approximated by means of diffusion theory. Moreover, we demonstrate that increasing the diversity of contributions greatly reduces the probability of finding the population in a homogeneous state full of defectors. This increase also raises the expectation of the total contribution in the entire population and thus promotes social cooperation. Furthermore, by investigating the evolutionary dynamics of optional public goods games with diverse contributions, we find that nonparticipation can assist players who contribute more in resisting invasion and taking over individuals who contribute less. In addition, numerical simulations are performed to confirm our analytical results. Our results may provide insight into the effect of diverse contributions on cooperative behaviors in the real world.
Pseudo-Particle Modeling （PPM） is a particle method proposed by Ge and Li in 1996 [Ge, W., ＆ Li, J. （1996）. Pseudo-particle approach to hydrodynamics of particle-fluid systems, in M. Kwauk ＆ J. Li （Eds.）, Proc...
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Pseudo-Particle Modeling （PPM） is a particle method proposed by Ge and Li in 1996 [Ge, W., ＆ Li, J. （1996）. Pseudo-particle approach to hydrodynamics of particle-fluid systems, in M. Kwauk ＆ J. Li （Eds.）, Proceedings of the 5th international conference on drculating fluidized bed （pp. 260-265）. Beijing： Science Press] and has been used to explore the microscopic mechanism in complex particle-fluid systems. But as a particle method, high computational cost remains a main obstacle for its large-scale application; therefore, parallel implementation of this method is highly desirable. Parallelization of two-dimensional PPM was carried out by spatial decomposition in this paper. The time costs of the major functions in the program were analyzed and the program was then optimized for higher efficiency by dynamic load balancing and resetting of particle arrays. Finally, simulation on a gas-solid fluidized bed with 102,400 solid particles and 1.8 × 10^7 pseudo-particles was performed successfully with this code, indicating its scalability in future applications.
In this paper, decentralized static output feedback is considered for a class of dynamic networks with each node being a nonlinear system with infinite equilibria. Based on the Kalman-Yakubovich-Popov (KYP) lemma, lin...
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ISBN:
(纸本)9781424477456
In this paper, decentralized static output feedback is considered for a class of dynamic networks with each node being a nonlinear system with infinite equilibria. Based on the Kalman-Yakubovich-Popov (KYP) lemma, linear matrix inequality (LMI) conditions are established to guarantee the stability of such dynamic networks. Furthermore, an interesting conclusion is reached: the stability problem for the whole Nn-dimensional dynamic networks can be converted into the simple n-dimensional space in terms of only two LMIs. A concrete application of output stabilization of coupled phase-locked loop networks is used to verify the effectiveness of the proposed methods.
Weak selection, which means a phenotype is slightly advantageous over another, is an important limiting case in evolutionary biology. Recently, it has been introduced into evolutionary game theory. In evolutionary gam...
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Weak selection, which means a phenotype is slightly advantageous over another, is an important limiting case in evolutionary biology. Recently, it has been introduced into evolutionary game theory. In evolutionary game dynamics, the probability to be imitated or to reproduce depends on the performance in a game. The influence of the game on the stochastic dynamics in finite populations is governed by the intensity of selection. In many models of both unstructured and structured populations, a key assumption allowing analytical calculations is weak selection, which means that all individuals perform approximately equally well. In the weak selection limit many different microscopic evolutionary models have the same or similar properties. How universal is weak selection for those microscopic evolutionary processes? We answer this question by investigating the fixation probability and the average fixation time not only up to linear but also up to higher orders in selection intensity. We find universal higher order expansions, which allow a rescaling of the selection intensity. With this, we can identify specific models which violate (linear) weak selection results, such as the one-third rule of coordination games in finite but large populations.
An Al2O3-SiO2-Na2O based coating for heats treatment application was prepared on 304 stainless steel substrate by air-spraying, and its effect on high temperature oxidation behavior of 304 stainless steel was investig...
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An Al2O3-SiO2-Na2O based coating for heats treatment application was prepared on 304 stainless steel substrate by air-spraying, and its effect on high temperature oxidation behavior of 304 stainless steel was investigated. TG-DTA and sintering point test were employed to examine the coating's thermal properties. SEM and optical microscope were used to characterize the as-received coating and cross section of the oxidized specimens. The results show that, when heating up, the coating melts down and transforms into a melting layer. Isothermal oxidation in air at 1250°C for 9 h shows that, yield percentage of the coated and bare specimen was 99.64% and 85.74%. The coating effectively blocks off the invasion of oxygen and protects stainless steel from high temperature oxidation.
We show that a weakly guiding nonlinear waveguide supports propagation of stable rotating solitons, azimuthons. We calculate analytically the rotation frequency of these solitons and find it to be in agreement with nu...
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