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The paper presents stabilization of a Networked Control System (NCS) with uncertain, time-varying delays using two stabilization approaches namely, Parameter Dependant Lyapunov Function (PDLF) and Quadratic Lyapunov Function (QLF). The PDLF approach depends upon the time varying delay parameters. Thus, for larger delays the system's stability is ensured. In NCS, the uncertainties arising out from...
The primary objective of this study is to propose an interval type-2 controller design method for a class of nonlinear singular networked control systems encountering data-transmission delay and packet loss problems. This study assesses the stability analysis and design of the system controllers. First, the singular networked control systems are modeled as interval type-2 T-S fuzzy systems. The concept...
We first discuss the dynamic stability of embedded SRAMs in 28-nm high-k/metal-gate (HK/MG) bulk CMOS technology. The good correlation between simulation result and measured data of the SRAM operation voltage Vmin is shown. Second, we introduce the test screening circuitries considering with dynamic stability for not only 6T single-port (SP) SRAM but also 8T dual-port (DP) SRAM. We designed and fabricated...
The stability analysis of network control systems still poses a challenge due to the nonlinear behavior induced by network transmissions. The current paper addresses the stability problem for a network control system which includes a nonlinear network transmission model. The network transmission model embeds the main characteristics of real TCP/IP network transmissions like time varying delays, packet...
In this work we focus on the study of limit cycles that appear on an Integrator Process with Time Delay (IPD) controlled by a PI when the feedback is done with an event-based paradigm. We use a level crossing sampling which can be characterized as a non-linearity of n levels with hysteresis, and possibly with saturation. We also study the differences between placing the sampler after the process output...
Deadzone and backlash are two common non-linearities in physical systems. This paper presents a novel approach to compensate for the effects generated by deadzone and saturation, or backlash and saturation, acting in series on a system's input. It takes advantage of the idea of inverting the deadzone or backlash to cancel its effects. It is shown that the final setting corresponds to that of a saturation...
This paper presents a Proportional Derivative (PD) controller with gain-scheduling depending on the distance for haptic interfaces and virtual environments subject to communication delays. It is well known that the presence of delays deteriorates the overall system performance. More precisely, depending on the proposed architecture as, for example, bilateral position-position coupling, time-delays...
In this paper, an innovative TCP flow control method is presented. An algorithm is proposed that combines RED (Random Early Detection) with TCP window adjustment to improve the network performance. Leveraging the advantages of RED and window adjustment, the algorithm demonstrates fast response and superior stability with controlled packet dropping rate, while still fully utilizing the network resource...
In this paper, the Genesio system with distributed time delay feedback is studied. Its linear stability is investigated based on the Routh-Hurwitz criteria. After the local asymptotic stability is analyzed, Hopf bifurcation is demonstrated by choosing the mean time delay as a bifurcation parameter. The direction and the stability criteria of the bifurcating periodic solutions are determined by applying...
In master-slave teleoperator systems used for tele-rehabilitation purposes, the passivity can be violated because of the assistive actions of a therapist; moreover, any type of passivation approach to the design of such a system would defeat the purpose of the assistive therapy. In this paper, a design framework is presented that does not rely on passivity considerations. A number of results are given...
This paper reports experimental analysis of human characteristic in the lever operation by utilizing the stabilization task of cart-pendulum system. Previous studies have shown that there was a difference in the velocity distribution of the cart in the difference of the skill level. Then, cart-pendulum simulator is newly constructed and training that does the stabilization operation is done for five...
This paper investigated the stabilization and stability problems for the Takagi-Sugeno (T-S) fuzzy systems with delays in state and input. Based on the non-parallel distributed compensation (non-PDC) technology, a fuzzy controller with non-PDC control laws is proposed to stabilize the T-S fuzzy systems with delays in state and input. For relaxing the stabilization conditions, a parameter-dependent...
In this paper, a partial dependent prey-predator model with discrete and distributed delays is studied by using the theory of functional differential equation and Hassard's method, the conditions on which positive equilibrium exists and Hopf bifurcation occurs are given, finally, numerical simulations are also included.
Stability analysis and control for linear periodic time-delay systems described by state space models are investigated in this paper. Semi-discretization method is used to develop a mapping of the system response in a finite-dimensional state space. The stability region and stability boundary can be found by comparing the maximum absolute value of the mapping's eigenvalues with 1. More importantly,...
Routing is a challenging issue when dealing with the multi-hop cognitive radio networks (CRNs). The stability of a route is highly influenced by the behavior of the primary user. The more frequently primary user changes its activity, the less stable spectrum availability the cognitive user has. This causes tremendous route stability fluctuation in CRNs. The radio environmental issues that affect the...
Networked control systems (NCS) are in existence for quite some time. The network-induced delays and packet drops; and their effect on control system's performance has been a burning topic for last one decade. Dependability in context of NCS has not got much attention. While it is an important aspect of NCS intended to be used in critical application. The paper reviews the present state of developments...
The introduction of communication systems to power system controllers have brought in another layer of complexity in their design and operation. In this paper a Plug-in Hybrid Electric Vehicle (PHEV) charging facility is studied. A linearized model of the facility is built including both the dc/dc and dc/ac converters of the Distributed Energy Resources (DER). In addition, a control strategy that...
In this paper, some ideas of switched systems with distributed time-varying delays are investigated. Based on the Lyapunov-Krasovskii functional and free-weighting matrices technique, the average dwell time method is applied to ensure the exponential stability of the systems. And a new stability criterion is obtained by the means of linear matrix inequities (LMI). Finally, a numerical example is presented...
In this paper, some delay-dependent LMI stabilization criteria are proposed to design H∞ switching control and switching signal for discrete switched system with interval time-varying delay. Some nonnegative inequalities are used to improve the conservativeness of the proposed results. Finally, a numerical example is illustrated to show the main proposed result.
In a two-way wireless relay network, two nodes communicate with each other through a relay, and throughput is enhanced by the relay transmitting a linear combination of the messages received from the two sources either at the bit level (digital network coding) or the signal level (analog network coding). In this paper, we solve for the fraction of time resources allocated to each transmission mode...
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