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In recent years the vestibular-sympathetic reflex has received an increasing amount of attention due to the role it could play in the human organism in different types of scenarios. Despite this, quantitative models of this reflex mechanism are still lacking. In this context, the current paper aims at taking a first step towards the modeling of the vestibular-sympathetic reflex by developing a model...
The current study focuses on the stability of a generic observer-based delay compensation structure for networked control systems with time-varying delays. After a brief presentation of the design principles, the stability conditions are derived in terms of maximum delay bounds, using a Lyapunov functional. Experimental results validate the entire approach on a specific case study.
Delay effects on dynamic (especially nonlinear) systems are known to be complex and are subject of intensive studies. Among the wide range of applications involved, biomedical systems (and in particular cardiovascular regulation) impose the need for systemic stability analysis in respect with time delays. The current study addresses the stability problem in respect with multiple delays for a qualitative...
Stability analysis for models of cardiovascular regulation is extremely complex due to multiple nonlinearities and multiple time delays. Most studies resume only to empirical results using simulations. The current work addresses the stability problem for a qualitative averaged model of cardiovascular regulation, focusing on deriving new insights on the role of time delays in generating stability or...
In approximating nonlinear systems, averaging theory provides very useful tools, especially for periodic/quasi-periodic systems. In the case of complex dynamical systems (e.g. biological systems), such an approach leads to consistent simplifications of the encountered mathematical models. The current paper addresses the problem of deriving a simple averaged model of the cardiovascular system, which...
The current study proposes a novel network control structure based on local and remote placed control elements, together with a nonlinear network transmission model recently proposed by the authors. For rejecting the disturbance effect of the network, a switched PD compensator is proposed. The control design methodology encompasses both analytical and numerical methods, so that both the stabilization...
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...
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...
The cardiovascular system with its nervous control has been the focus of several mathematical modeling studies and numerous experimental investigations in the past. The purpose of the paper is to establish, by improving the existing models, an appropriate model of the cardiovascular system with its nervous control adapted to human characteristics. The research starts from a well-known model from the...
A pressing issue of Network Control Systems is the time-varying delay which alters the system's performance. The current study designs and analysis a control structure based on a communication disturbance observer for delay compensation for second order linear processes. The proposed networked control system is tested through simulations and experiments, using a new network model recently proposed...
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