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The aim of this paper is to cope with the ℋ∞ control synthesis for time-delay linear systems. We extend the use of a finite order LTI system, called comparison system to ℋ∞ analysis and design. Differently from what can be viewed as a common feature of other control design methods available in the literature to date, the one presented here treats time-delay systems control design with classical numeric...
In this paper, we develop a nonlinear controller to achieve trajectory tracking for a velocity-sensorless vertical take-off and landing (VTOL) aircraft with measurement delays. By applying Pade approximation technique, the original controlled system is approximately transformed into an augmented dimension system without any time delay. After constructing full-order observer, error coordinate transformation,...
Networked control systems (NCS) are distributed control system in which sensors, actuators and controllers are physically separated and connected through communication networks. NCS represent the evolution of networked control architectures providing greater modularity and control decentralization, ease maintenance and diagnosis and lower cost of implementation. A recent trend in this research topic...
Recently, the study of real-world haptics has been actively researched. In order to transmit tactile sensation to a remote place, it is necessary to utilize a network. In Internet, as a factor which affects the hard real-time property and transfer reliability of communication. There are communication delays, packet losses and sequential number changes. In conventional studies, the communication delay...
The problem of adaptive robust stabilization is considered for a class of uncertain nonlinear time-delay dynamical systems. It is assumed that the upper bound of the nonlinear delayed state perturbations is a linear function of some parameters which are assumed to be unknown. It is also assumed that the time delays are time-varying, and can be any nonnegative continuous and bounded functions. In this...
In this paper, we present a new time delay estimator for multipath environments using the importance sampling (IS) method. The new technique allows finding the maximum of the compressed likelihood function in an efficient manner. The main idea consists in generating realizations of a random variable distributed according to a function that approximates the actual compressed likelihood function and...
Time delay estimation is important task in many signal processing application. Cost function parameter is used for estimating true delya's. In this paper we have modified the cost function by taking into account the low pass filtering characteristics of channel. Results obtained are calculated with the help of accuracy percentage.
Parallel cascade control structure is commonly used in the operation of process industries to reject disturbances that have a rapid effect on a secondary measured state, before the primary measured variable is affected. The investigations on PID tuning rules for SISO systems are many; however the literature about synthesis methods for designing and tuning cascade control structures appears to be rather...
This paper gives sufficient conditions for the practical and finite time stability of a particular class of linear discrete time delay systems. Analyzing the finite time stability concept, these new delay-independent conditions are derived using an approach based on the Lyapunov-like functions. The practical stability and attractive practical stability for discrete time delay systems have been investigated...
Starting from mathematical model, following electric guitar effects are implemented: delay, chorus and flanger. Implementation is done on a commercial fixed point single core DSP processor, which has total 24k words data memory, 2k program memory and processor speed of 150 MIPS.
Feedback control systems wherein the control loops are closed through a real-time network are called networked control systems. This type of system has many advantages of flexibility with respect to traditional control systems. The insertion of communication network in the feedback control loop makes the analysis and design of networked control systems complex. The tools and methods developed in conventional...
Wireless sensor networks are often deployed in harsh natural environment, in which sensor nodes are vulnerable and therefore produce wrong data. In order to solve this problem, the paper proposes a distributed fault detecting algorithm based on spatio-temporal correlation among data of adjacent nodes. By comparing the sample values of two nodes in short interval, the validity of the data is verified...
Most Interior Gateway Protocols that use dynamic metrics for cost, such as time delay or utilization rate, suffer from instability problems; and that's why most IGPs use static metrics for cost. However, with static metrics, real-time network traffic situation cannot be detected, so that better path solutions cannot be selected. In this paper, we discuss the way to overcome the instability problem...
In this paper, we consider the globally stability of BAM neural networks with time delays and Random Variable-time Impulses (RVI). RVI denotes the impulses occurring follow Poisson Arrival in time, instead of fixed instants. Under this assumption, the time interval between two successive impulses follows exponential distribution with arrival rate. By simulation, we found that the system will be more...
As the generalized cross-correlation method has high real-time in the delay Algorithm, when the experiment environment is the a priori knowable, Generalized cross-correlation algorithm is usually used. The pre-filtering of the generalized cross-correlation method has a greater impact on the accuracy of time delay estimation, for the problem that how to effectively use the generalized cross-correlation...
Time synchronization is the necessary technique to implement automation system in smart substations. It provides the accuracy time stamp mark used for data acquisition and used to analyze and deal with the power system fault. As a type of clock synchronization used in network with high precision, IEEE1588 is widespread applied recently in smart substations. This paper analyzes the reason of clock...
This work considers the stabilization problem of a class of unstable first order linear systems with time delay. A methodology is proposed to tune a proportional-derivative (PD) controller. Necessary and sufficient conditions are stated in order to guarantee the stability of the delayed closed loop system. The main motivation for studying this problem arises when checking for systems with a considerable...
In this paper, we investigate coordinated control for multiple agents with coupling delay under general fixed directed information topology. Stability analysis is performed based on Lyapunov-Krasovskii functional method. Delay -dependent asymptotical stability condition in terms of linear matrix inequalities (LMIs) is derived for the coordinated control algorithm of delayed dynamical networks with...
Networked Control Systems are feedback control systems wherein the control loops are closed through a real time network. The information from sensors and controllers in NCS is sent over a real-time communication network. Depending upon the topology and the routing algorithms used, the network can introduce non-deterministic and undesired delays, jitter and losses. In NCS, if the time-delay exceeds...
In this paper, we consider a method to design a full-order nonlinear observer for a class of nonlinear time-delay systems with unknown inputs. Based on Lyapunov-Krasovskii functional, we derive a sufficient condition for existence of the designed observer which requires solving a set of nonlinear matrix inequalities. Then, the achieved condition is formulated in terms of two linear matrix inequalities...
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