Normalized finite fractional differences are considered as an approximation to the Grunwald-Letnikov fractional difference. In particular, adaptive finite fractional difference (AFFD) is recalled and effectively modif...
详细信息
Normalized finite fractional differences are considered as an approximation to the Grunwald-Letnikov fractional difference. In particular, adaptive finite fractional difference (AFFD) is recalled and effectively modified by the introduction of a time-varying forgetting factor. the modified AFFD is shown in simulations to provide an excellent approximation performance, both in terms of the modeling accuracy and robustness.
the paper presents a survey of proposed in the scientific works, as well as applications implemented in industrial practice of anti-sway crane control systems based on the intelligent solution (fuzzy logic, neural net...
详细信息
the paper presents a survey of proposed in the scientific works, as well as applications implemented in industrial practice of anti-sway crane control systems based on the intelligent solution (fuzzy logic, neural network and genetic algorithm and hybrid combine solution. the other part of paper contain review of solution concern crane workspace visualization techniques with obstacle identification for non-collision payload trajectory path planning. Presented solution was base on the image processing techniques, especially base on the stereovision technique.
the current paper proposes a new network control structure based on a nonlinear network transmission model recently proposed by the authors, a switched PD time delay compensator and a state feedback controller. the de...
详细信息
the current paper proposes a new network control structure based on a nonlinear network transmission model recently proposed by the authors, a switched PD time delay compensator and a state feedback controller. the design methodology described for the control structure consists in a coupling between analytical tuning methods and numerical optimization methods. the stability is assessed in the framework of switched linear systems through a switched quadratic Lyapunov function. Finally, the results are validated on a numerical example.
Results of the transfer function analysis for a class of distributed parameter systems described by hyperbolic partial differential equations are presented. Assuming two lumped boundary inputs and two outputs distribu...
详细信息
Results of the transfer function analysis for a class of distributed parameter systems described by hyperbolic partial differential equations are presented. Assuming two lumped boundary inputs and two outputs distributed along the spatial variable, the expressions for the individual elements of the transfer function matrix are derived for the decoupled system, using both exponential and hyperbolic functions. A formula for converting the transfer function matrix to the form describing the original coupled system is also proposed. the considerations are illustrated with a practical example of an electrical transmission line.
the multimode resource-constrained project scheduling problem is considered. In some practical situations resources used to perform an activity have to be set up before the execution of this activity. Setup operations...
详细信息
the multimode resource-constrained project scheduling problem is considered. In some practical situations resources used to perform an activity have to be set up before the execution of this activity. Setup operations are characterized by two parameters setup time and setup cost. the latter is considered if the financial aspects of the schedule are taken into account. In this paper we present an adaptation of the classical models of setups, which are known from the machine scheduling theory, to the multimode project scheduling problem. Several new concepts are proposed as well.
In this paper a nonholonomic motion planning task was solved using an algorithm proposed by Sussmann and Liu [8] and based on controls in the form of highly oscillatory series (HOS). Outputs of the algorithm were eval...
详细信息
In this paper a nonholonomic motion planning task was solved using an algorithm proposed by Sussmann and Liu [8] and based on controls in the form of highly oscillatory series (HOS). Outputs of the algorithm were evaluated with respect to energy expenditure on controls and speed of its convergence. Based on characteristic features of the task, two modifications of the algorithm were proposed. Simulations were carried out on the unicycle model and an exemplary nilpotent nonholonomic system. Finally, the relevance of the algorithm to possible applications was discussed.
the problem of distributing gas through a network of pipelines is formulated as an linearized nonstationary differential repetitive model subject to some flow-pressure constraints of material balances and pressure bou...
详细信息
the problem of distributing gas through a network of pipelines is formulated as an linearized nonstationary differential repetitive model subject to some flow-pressure constraints of material balances and pressure bounds. the linear model is constructed in the neighborhood of the known basic operating regime of gas delivery. the considered problem is to minimize the total supply cost of a gas transmission company withthe minimal guaranteed pressure at the nodes. Some aspects of a comprehensive optimization theory based on a `constructive approach' are discussed.
In the paper an approach to discrete-time frequency response as well as the corresponding parametric model identification using deterministic discrete-time multisine excitations and quantized plant output is presented...
详细信息
In the paper an approach to discrete-time frequency response as well as the corresponding parametric model identification using deterministic discrete-time multisine excitations and quantized plant output is presented. A focus on model identification in the case of disturbance-free plant output and output signal level comparable with data acquisition system accuracy is given. Convergence of the identified model to true plant is discussed. the presented discussion is illustrated by an example showing properties of the presented approach.
It is possible to obtain an unbiased coefficient estimates of a stable elementary bilinear time-series model by using Saturated Mean Square Error as a cost function of identification algorithm. However, a proper evalu...
详细信息
It is possible to obtain an unbiased coefficient estimates of a stable elementary bilinear time-series model by using Saturated Mean Square Error as a cost function of identification algorithm. However, a proper evaluation of Saturation Level is required to ensure correct placement of the global minimum of the cost function therefore, the variance of the original innovation signal is required. Due to lack of this information before the identification run, an approximation procedure is necessary which is proposed in this paper.
the paper is devoted to the problem of pole assignment by state feedback in non-square implicit linear systems. In particular, the proof of theorem 4.6 in [5] (here theorem 1) is completed by a proof of sufficiency co...
详细信息
the paper is devoted to the problem of pole assignment by state feedback in non-square implicit linear systems. In particular, the proof of theorem 4.6 in [5] (here theorem 1) is completed by a proof of sufficiency conditions, providing a complete solution to the problem of pole assignment in the case of column regularizable systems.
暂无评论