Controllability and Observability of Input /Output Delayed Discrete Systems

Controllability and Observability of Linear Discrete-Time Systems with Network Induced Variable Delay

“…The state variables depend on a function defined on a time interval whose length is equal to the maximum input-channel delay. This article extends the results from Ionete et al (2006) to the case of variable network-induced delays.…”

Optimal Sensor Communications in Presence of Transmission Delays and Bandwidth Limitations

“…This section simulates a model for active-passive car suspension system studied in [3,5,20,21]. A quarter car model shown in Figure 2 is used for simulation.…”

“…A similar problem arises in sensor-actuator networks known also as networked control systems where actuator accesses to the network should be arbitrated in order to stabilize a plant or optimize the control performance [2][3][4]. The problem of choosing the best communication sequence is hybrid involving both continuous and binaryvalued variables [5] and of combinatorial nature [6] in which the number of feasible sequences is of a combinatorial order. In this paper, we use results of [7,8] to formulate the problem as a convex optimization which could be solved via numerically efficient tools like CVX [8] and similar software.…”

“…The sensor selection is usually performed offline to select a few sensors out of all available ones [10] in order to achieve optimal estimation. On the other hand, the sensor scheduling is performed offline, online, or semionline in order to determine the order of sensor accesses to network which may be randomly chosen based on a preassigned distribution function [13] or a deterministically (offline or online) assigned schedule as in [4,5,7] and the present paper. Also, the result of a sensor selection algorithm is a subset of all sensors which means some of the sensors are to be discarded and there is no priority between the selected sensors.…”

“…References [4,9] assume that those channels that have not been updated in the last time tick are Reset to Zero (henceforth referred to as RTZ policy) instead of being held (henceforth referred to as Zero-Order Hold; ZOH policy). The question of either holding or forgetting sensor or actuator data is discussed in [4,5]. While the problem has received attention in the case of actuator scheduling (see [2,4,14]), the case of sensor scheduling, apparently, has received less attention.…”