Event-driven Control System Research Articles

Event-driven observer-based control for distributed parameter systems using mobile sensor and actuator

This paper considers the event-driven observer-based control for distributed parameter systems using mobile sensor and actuator. An observer is designed to estimate the states of the distributed parameter systems based on the measurement information provided by the mobile sensor. In order to reduce the frequency of the signal transmissions between the observer and the controller, an event-driven scheme is introduced. Once an event is generated, the event detector will send the newest observer state to the controller. Meanwhile, a guidance scheme is provided to drive the actuator to the position where the observer state reaches the maximum value to improve the control performance. For the event-driven control system, the global uniform ultimate boundedness can be guaranteed by the Lyapunov functional approach despite the reduced sampling frequency. A numerical example is finally presented to illustrate the effectiveness and the advantages of the proposed approaches.

Event Driven Networked Control System for Impact Load Monitoring

The article describes the application of the event-driven networked control system (NCS) for impact load monitoring. The main problem in this type of application is measurement synchronization, which should provide full information about the impact in terms of stochastic delays introduced by the network and stochastic characteristics of the actuator. Using the simulation model of the NCS system, the method of solving this particular problem was developed. The results of verification tests for the real object and a synchronized dynamic measurement of signals from resistance strain gauges are presented. The described system can find use in monitoring and fault detection, in tasks connected with dynamics of liquids and gases, acoustics, and the analysis of resistance properties of materials and technical objects. Key words: Networked control system (NCS), event maintenance, event synchronization, impact monitoring, measurement trigger, strain gauge.

Designing adaptive integral sliding mode control for heart rate regulation during cycle-ergometer exercise using bio-feedback.

This paper considers our developed control system which aims to regulate the exercising subjects' heart rate (HR) to a predefined profile. The controller would be an adaptive integral sliding mode controller. Here it is assumed that the controller commands are interpreted as biofeedback auditory commands. These commands can be heard and implemented by the exercising subject as a part of the control-loop. However, transmitting a feedback signal while the pedals are not in the appropriate position to efficiently exert force may lead to a cognitive disengagement of the user from the feedback controller. To address this problem this paper will employ a different form of control system regarding as "actuator-based event-driven control system". This paper will claim that the developed event-driven controller makes it possible to effectively regulate HR to a predetermined HR profile.

Event-Driven Control System for Geographically Distributed Hybrid Simulation

An event-driven distributed control system for conducting continuous seismic response simulations using geographically distributed hybrid models is presented. Hybrid models, comprising appropriately scaled experimental and numerical substructures in networked geographically distributed laboratories or computers, can be used to realistically and cost-effectively evaluate the performance of complex structures at large scales. The principal advantage of the proposed event-driven control system is its ability to mitigate the adverse effects of random completion times of communication, computation, actuation and measurement tasks during a hybrid simulation on the stability, accuracy and reliability of the simulation results. The efficiency of the proposed continuous extrapolation/interpolation hybrid simulation method is demonstrated by examining the earthquake response of a two-story shear building model that comprises two experimental substructures and a numerical integrator connected through the internet. An evaluation of results from these hybrid simulations suggests that distributed hybrid simulation conducted using the proposed procedure provides accurate and reliable results.

413 XMLベース人間-機械協調制御システムの構築(人間と機械II)(OS.4 人間と機械)

The World Wide Web has evolved into a global environment for delivering applications ranging from small-scale to large-scale, enterprise workflow and manufacturing systems distributed over many servers. Its capability to disseminate complex multimedia information to anywhere is unprecedented. This capability could be used effectively in environments where monitoring, control, and data analysis are of primary concern. This paper proposes an XML-based human-machine cooperative monitoring, control, and data analysis. It consists of an event-driven control system using a distributed software environment and an XML document. Monitoring data are captured as an event which is encoded as an XML document, and control data are served as an event which is wrapped in an XML document. The monitoring and control system of distributed applications is independent of the platform and the programming language is an application programmer interface for generating XML wrapped data. As an example, we have construct XML-based distributed air conditioning control system considering the comfort of each person. Our experiments have confirmed that the proposed methods are useful for Web-based monitoring and control system.

An application of C++ to manufacturing system control

An event-driven control system was developed for the control of a physical simulator of a computerized manufacturing system using the object-oriented features of C++. The control architecture includes four distinct layers: a PC/386 computer running a Turbo C++ control program, an onboard microcomputer with a built-in BASIC interpreter running a polling and packet processing program, an OPTO 22 I/O controller, and the system's control devices such as motors, solenoids, and sensors. The two top levels (the PC/386 and the onboard microcomputer) are application dependent, while the other two are hard-wired devices that require no modifications for different operations.