Communication Network In Control Systems Research Articles

Применение сетей Петри для исследования сетевых систем управления

The use of communication networks in control systems has several important advantages, such as the ability of information transfer and remote control of various objects, the possibility of modifications and maintenance. On the other hand, the time between reading measurements from the sensor and sending a control signal to the actuator depends on the network characteristics (topology and routing scheme), and such a time delay can greatly affect the overall network performance. Delays, distortions and loss of transmitted data not only degrade the performance of the network management system, but also destabilize it. The paper considers the use of Petri nets as a method for modeling networked control systems (NCS) on the example of designing an active suspension control system for a car. When modeling, the star and common bus topologies were used, the comparison of which revealed that control systems with the common bus topology function 40% faster than systems with the star topology.

Using Communication Networks in Control Systems: The Theoretical and Practical Challenges

Using Communication Networks in Control Systems: The Theoretical and Practical Challenges

A real-time web-based networked control system education platform

Networked control systems have recently experienced a surge in fundamental theoretical results ignited by numerous advantages of introducing shared multipurpose communication networks in control systems. Regarding developments on the practical side, however, a networked control system is still wanting when it comes to experimental platforms suitable for research and educational purposes, which contributes to most of networked control system theory being validated by means of numerical examples and simulations. This paper addresses this issue by presenting a low-cost real-time networked control system platform, based on custom hardware and software solutions that can be readily explored with the sole use of a web browser connected to the Internet. The technical decisions made during development represent a fundamentally novel take on networked control system experimental platforms that can potentially be reproduced by several universities. The platform provides the user with multiple controller and input reference options, network configurations, delay statistics, and even a downloadable file containing advanced experiment data. A survey conducted with students located over 1200 km away from the platform who used it during laboratory assignments highlight the system’s usability and interactivity, and supports the platform is suitable for educational purposes.

Event-based control with communication delays

AbstractEvent-based control aims at reducing the information exchange over the communication network in control systems. This paper extends an event-based state-feedback approach in order to cope with the situation that the digital communication link between the sensors and the actuators induces a substantial time delay. As the main result, a bound for the maximum tolerable time delay is derived, which guarantees that the event-based control loop is stable, in the sense, that its state remains in a bounded surrounding of the state of a continuous-time state-feedback loop without delays.

Event-based control using quantized state information

Event-based control aims at reducing the information exchange over the communication network in control systems. This paper presents an extension of an existing event-based state-feedback approach that reduces the communication to quantized state information, which requires a low number of bits to be transmitted over the network. The main results are a maximum bound for the deviation between the behavior of the quantized event-based control loop and a continuous state-feedback loop and a direct relation between the maximum communication frequency and the number of bits to be sent. The results are evaluated by simulations and experiments.