This paper presents a distributed event-based control strategy for a networked dynamical system consisting of N linear time-invariant interconnected subsystems. Each subsystem broadcasts its state over the network acc...
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ISBN:
(纸本)9781612848006
This paper presents a distributed event-based control strategy for a networked dynamical system consisting of N linear time-invariant interconnected subsystems. Each subsystem broadcasts its state over the network according to some triggering rules which depend on local information only. The system converges to an adjustable region around the equilibrium point under the proposed control design, and the existence of a lower bound for the broadcasting period is guaranteed. The effect of the coupling terms over the region of convergence and broadcasting period lower bound is analyzed, and a novel model-based approach is derived to reduce the communications. Simulation results show the effectiveness of the proposed approaches and illustrate the theoretical results.
Abstract This paper deals with robust invariant sets construction for discrete-time linear time-invariant dynamics. The case of a zonotopic disturbance set is analysed in detail by exploiting the properties of these g...
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Abstract This paper deals with robust invariant sets construction for discrete-time linear time-invariant dynamics. The case of a zonotopic disturbance set is analysed in detail by exploiting the properties of these geometrical structures. A constructive method is provided for diminishing the conservatism of ultimate bound invariant sets. It is shown that the resulting zonotopic set is related to the minimal robust positively invariant set in the sense that their boundaries have common points.
We give a simple, explicit example of a two-dimensional polynomial vector field that is globally asymptotically stable but does not admit a polynomial Lyapunov function.
ISBN:
(纸本)9781612848006
We give a simple, explicit example of a two-dimensional polynomial vector field that is globally asymptotically stable but does not admit a polynomial Lyapunov function.
We introduce some modifications to the widely deployed Kerberos authentication protocol. The principle's secret-key will be independent of the user password to overcome the weak passwords chosen by the network pri...
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We introduce some modifications to the widely deployed Kerberos authentication protocol. The principle's secret-key will be independent of the user password to overcome the weak passwords chosen by the network principal that are susceptible to password guessing attacks, the main drawback of the Kerberos protocol. Instead, the Kerberos Distribution Center saves a profile for every instance in its realm to generate the principle's secret-key by hashing the profile, and encrypting the output digest. Besides, the lifetime of the secret-key is controlled using the sys-tem clock. Triple-Des is used for encryption, SHA-256 for hashing, and Blum Blum Shub for random number gen-eration.
Time optimal control (TOC) for servomechanism is not a practical controller due to the chattering phenomenon that occurs on the presence of noise and model uncertainty. Maybe the most popular attempt to transform this...
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Time optimal control (TOC) for servomechanism is not a practical controller due to the chattering phenomenon that occurs on the presence of noise and model uncertainty. Maybe the most popular attempt to transform this controller in a practical one comes from the so called Proximate Time Optimal Servomechanism (PTOS). This approach starts with a near time optimal controller and then switches to a linear controller when the system output approaches the target. While the chattering phenomenon is avoided, this comes at an expense in performance generated by the so called “acceleration discount factor”. This paper will present a controller that makes use of dynamic damping in order to push the acceleration discount factor arbitrarily close to one, thus practically eliminating the conservatism present in the PTOS. Experimental results support the proposed design.
Abstract This paper attempts to achieve time-optimal performance for servomechanisms via a practical feedback control law. An improvement over the traditional Proximate Time Optimal Servomechanism (PTOS) is proposed i...
Abstract This paper attempts to achieve time-optimal performance for servomechanisms via a practical feedback control law. An improvement over the traditional Proximate Time Optimal Servomechanism (PTOS) is proposed in order to eliminate the conservatism present in the controller. The original PTOS switches from the nonlinear approximation of Time Optimal control (TOC) to a linear controller as the system approaches the reference point. This switching results in a compromise in performance inasmuch as the linear controller is not sufficiently aggressive to settle the system output with acceptable levels of overshoot. The proposed controller eliminates the necessity of the switching function by making use of an elaborate nonlinear control law. Simulations and experimental results show that the proposed design achieves levels of performance comparable to that of the theoretical TOC.
In recent years, ever more difficult market conditions have forced paper mills to give even greater attention than before to reducing costs and increasing production. De-inking plants are being called upon to deliver ...
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In recent years, ever more difficult market conditions have forced paper mills to give even greater attention than before to reducing costs and increasing production. De-inking plants are being called upon to deliver better control of brightness, at higher yield, to use less chemical additive and to operate at higher tonnages. The paper describes an online optimisation and control system that meets all these demands in real time, including online optimisation of flotation yield. Advanced Process control (APC) technology has been used in implementing this system;it recognises the multivariable character of the many variables that determine de-inked pulp brightness, yield and the demand for chemical additives. The paper reports an implementation of this approach on the de-inking plant at Aylesford Newsprint Ltd (ANL), in Kent, England. The optimisation system allows operations personnel to specify the costs of recycled paper, bleach, caustic and polymer for the water cleaning system in real time. Based on these costs and the value of finished de-inked pulp, the system determines optimal operation online. This has delivered a number of very significant benefits, providing a very short project payback time. For the ANL DIP case study reviewed in this paper: • Brightness is controlled tightly, to a standard deviation of less than 0.3 points. • Production can be maximised or automatically adjusted, based on paper machine demand. Production changes can be made while tight brightness control is maintained. • There has been a significant reduction in bleach and caustic use and in the polymer used in water treatment. • The APC system has significantly enhanced the ability to maintain and improve yield against the effect of many factors that would otherwise diminish yield. • The constraint management that APC offers means that the operability of the plant has been significantly improved, including better management of plant bottlenecks. • The DCS screens showing what the APC s
This project was inspired by the idea of the connection of amusement and useful thing respectively the movement by the playing games, because as is known global problem of the Word is increasing obesity caused by the ...
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This project was inspired by the idea of the connection of amusement and useful thing respectively the movement by the playing games, because as is known global problem of the Word is increasing obesity caused by the addiction on the PC games at the young people. This project connects pleasurable with useful, respectively playing of the game with physical effort. By the help of the accelerometer is possible to handle by simple games to whose operating is needed physical impulsion of the player. After it would be possible to take up on this project by the beat measurement of the player in order to check on effectivity of the suggested system. Software was programmed in background C#.
Recently, Gutierrez-Naranjo and Leporati considered performing basic arithmetic operations on a new class of bioinspired computing devices -- spiking neural P systems (for short, SN P systems). However, the binary enc...
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Recently, Gutierrez-Naranjo and Leporati considered performing basic arithmetic operations on a new class of bioinspired computing devices -- spiking neural P systems (for short, SN P systems). However, the binary encoding mechanism used in their research looks like the encoding approach in electronic circuits, instead of the style of spiking neurons (in usual SN P systems, information are encoded as the time interval between spikes). In this work, three SN P systems are constructed as adder, subtracter and multiplier, respectively. In these devices, a number is inputted to the system as the interval of time elapsed between two spikes received by input neuron, the result of a computation is the time between the moments when the output neuron spikes.
Electronic components are conventionally viewed as black boxes whose only responsibility is to implement interfaces requested and required by designers operating at a higher level of abstraction. This is especially tr...
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ISBN:
(纸本)9781467303217
Electronic components are conventionally viewed as black boxes whose only responsibility is to implement interfaces requested and required by designers operating at a higher level of abstraction. This is especially true in the design of controllers where control laws are designed at at high level of abstraction and electronics are used to merely instantiate components of the law's block diagram. In this paper, we consider the use of block components that adapt their internal structures to optimize whole-system behavior using information scoped in multiple layers of abstraction of the whole design. The goal is to provide extended adaptability of the host system while still allowing high-level designers to treat their control design process conventionally.
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