There are many communication imperfections in networked control systems (NCS) such as varying transmission delays, sampling/transmission intervals, packet loss, constraints and quantization effects. Most of the available literature on NCS focuses only some these aspects, while ignoring others. In this paper we present a general framework that incorporates constraints, intervals delays. Based newly developed model including all network phenomena, will provide an explicit construction...

Nowadays, throughput has become a limiting factor in road transport. An effective means to increase the is employ small intervehicle time gap using automatic vehicle-following control systems. String stability, i.e., disturbance attenuation along vehicle string, considered an essential requirement for design of those However, formal notion string stability not unambiguous literature, since both and performance interpretations exist. Therefore, novel definition nonlinear cascaded systems...

Road throughput can be increased by driving at small inter-vehicle time gaps. The amplification of velocity disturbances in upstream direction, however, poses limitations to the minimum feasible gap. String-stable behavior is thus considered an essential requirement for design automatic distance control systems, which are needed allow safe gaps well below 1 s. Theoretical analysis reveals that this met using wireless communication provide real-time information preceding vehicle, addition...

In this paper, we study the stability of networked control systems (NCSs) that are subject to time-varying transmission intervals, delays, and communication constraints. Communication constraints impose that, per transmission, only one node can access network send its information. The order in which nodes their information is orchestrated by a protocol, such as, Round-Robin (RR) Try-Once-Discard (TOD) protocol. generalize mentioned protocols novel classes so-called "periodic" "quadratic"...

Cooperative adaptive cruise control (CACC) allows for short-distance automatic vehicle following using intervehicle wireless communication in addition to onboard sensors, thereby potentially improving road throughput. In order fulfill performance, safety, and comfort requirements, a CACC-equipped platoon should be string stable, attenuating the effect of disturbances along string. Therefore, controller design method is developed that explicit inclusion stability requirement synthesis...

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> In this technical note, a new approach for the stability analysis and controller synthesis of networked control systems (NCSs) with uncertain, time-varying, network delays is presented. Based on Jordan form continuous-time plant, discrete-time representation NCS derived. Using model that can be both smaller larger than sampling interval, sufficient LMI conditions feedback stabilization are...

In this paper, we consider a Cooperative Adaptive Cruise Control (CACC) system, which regulates intervehicle distances in vehicle string, for achieving improved traffic flow stability and throughput. Improved performance can be achieved by utilizing information exchange between vehicles through wireless communication addition to local sensor measurements. However, introduces network-induced imperfections, such as transmission delays, due the limited bandwidth of network fact that multiple...

Cooperative adaptive cruise control (CACC) employs wireless intervehicle communication, in addition to onboard sensors, obtain string-stable vehicle-following behavior at small distances. As a consequence, however, CACC is vulnerable communication impairments such as latency and packet loss. In the latter case, it would effectively degrade conventional (ACC), thereby increasing minimal distance needed for behavior. To partially maintain favorable string stability properties of CACC, strategy...

This paper studies the dynamical response of a rotary drilling system with drag bit, using lumped parameter model that takes into consideration axial and torsional vibration modes bit. These vibrations are coupled through bit-rock interaction law. At interface, cutting process introduces state-dependent delay, while frictional is responsible for discontinuous right-hand sides in equations governing motion complex characterized by fast dynamics compared to slow dynamics. A dimensionless...

This paper proposes a cooperative intersection control strategy, which aims to decrease the number of accidents and increase traffic flow at intersections. Existing high-level automation methodologies mainly focus on determination safe crossing sequence involved vehicles, typically ignoring realistic vehicle dynamics aspects. The solution proposed in this paper, referred as (CIC), takes into account vehicles is based novel concept virtual platooning. Virtual platooning allows form platoons...

Chatter is an instability phenomenon in machining processes which limits productivity and results inferior workpiece quality, noise rapid tool wear. The increasing demand for the manufacturing community motivates development of active control strategy to shape chatter stability boundary processes. In this work a methodology high-speed milling process developed that alters such area chatter-free operating points increased higher can be attained. paper based on robust approach using <formula...

Fuel cell electric vehicles convert chemical energy of hydrogen into electricity to power their motor. Since cars are used for transport only during a small part the time, stored in on-board tanks fuel can be provide when parked. In this paper, we present community microgrid with photovoltaic systems, wind turbines, and that vehicle-to-grid renewable generation is scarce. Excess produce hydrogen, which refilling station. A central control system designed operate such way operational costs...

We investigate the tracking control of nonlinear networked systems (NCS) affected by disturbances. consider a general scenario in which network is used to ensure communication between controller, plant and reference system generating desired trajectory be tracked. The constraints induce non-vanishing errors (in general) on feedforward term output system, affect convergence error. As consequence, available results stabilization equilibrium points for NCS are not applicable. Therefore, we...

In this paper, a distributed consensus control approach for vehicular platooning systems is proposed. formalizing the underlying problem, realistic vehicle dynamics model considered and velocity-dependent spacing policy between two consecutive vehicles realized. As particular case, allows to consider bidirectional interaction, which improves cohesion in platoon. Exponential stability of platoon evaluated, also challenging scenario limitation on velocity one introduced. The theoretical...

Cooperative adaptive cruise control (CACC) is a potential solution to decrease traffic jams caused by shock waves, increase the road capacity, fuel consumption and improve safety. This paper proposes an integrated combination of four challenges in these CACC systems. One technological how guarantee string stability (the ability avoid amplification dynamic vehicle responses along vehicles) under nominal operational conditions. The second challenge apply this heterogeneous vehicles. third...

In this paper, the stability of a Networked Control System (NCS) with time-varying delays is analyzed. A discrete-time state-space model used to analyze dynamics NCS. The delay introduced by network itself and assumed be upperbounded fraction sample-time. typical motion control example presented in which time-variation results an unstable system, although for each fixed system stable. Conditions terms LMIs are guaranteeing robust asymptotic given bounds on uncertain delay. Moreover, it shown...

Rotary drilling systems are known to exhibit torsional stick-slip vibrations, which decrease efficiency and accelerate the wear of drag bits. The mechanisms leading these vibrations analyzed using a model that includes both axial drill string dynamics, coupled via rate-independent bit-rock interaction law. Earlier work following this approach featured lacked two essential aspects, namely, flexibility dissipation due friction along bottom hole assembly. In current paper, stiffness damping...

Abstract In this paper, a solution to the approximate tracking problem of sampled‐data systems with uncertain, time‐varying sampling intervals and delays is presented. Such can typically occur in field networked control systems. The network cause inexact feedforward, which induces perturbation on error dynamics, for model presented paper. Sufficient conditions input‐to‐state stability (ISS) dynamics respect are given. Hereto, two analysis approaches developed: discrete‐time approach an terms...