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A PID servo control system experiment conducted remotely via Internet
R. M. Parkin, C. A. Czarnecki, Riko Šafarič, D. W. Calkin, 2002, original scientific article

Abstract: The principles of robotics and control are widely taught in engineering subjects, however a common problem concerns the limited availability of expensive equipment with which students can work with, in order to acquire valuable practical "hands on" experience. The MuMaTE virtual robotics and control project on the World Wide Web (www) was launched to evaluate the suitability of virtual learning environments, the Internet, and multimedia technologies within an engineering-based flexible learning program. Students using networked computers can access this facility to study a wide variety of on-line course material and perform a series of interactive experiments with real world laboratory hardware. This paper presents an on-line experiment, which enabled users to successfully control and observe the response of a commercial position servo system. The development of the project web server, interface electronics and control software is also discussed.
Keywords: automatic control, control, control systems, virtual learning, distance learning, servo system
Published: 01.06.2012; Views: 898; Downloads: 20
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Decomposed fuzzy proportional-integral-derivative controllers
Marjan Golob, 2001, original scientific article

Abstract: In this paper, several types of decomposed proportional-integral-derivative fuzzy logic controllers (PID FLCs) are tested and compared. An important feature of decomposed PID FLCs are their simple structures. In its simplest version, the decomposed PID FLC uses three one-input one-output inferences with three separate rule bases. Behaviours of proportional, integral and derivative PID FLC parts are defined with simple rules in proportional rule base, integral rule base and derivative rule base. The proposed decomposed PID FLC has been compared with several PID FLCs structures. All PID FLCs have been realised by the same hardware and software tools and have been applied as a real-time controller to a simple magnetic suspension system.
Keywords: fuzzy logic control, PID control, decomposed fuzzy system, magnetic suspension system
Published: 01.06.2012; Views: 975; Downloads: 31
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Optimized PID position control of a nonlinear system based on correlating the velocity with position error
Nenad Muškinja, Matej Rižnar, 2015, original scientific article

Abstract: We examined a design approach for a PID controller for a nonlinear ball and beam system. Main objective of our research was to establish a nonmodel-based control system, which would also not be dependent on a specific ball and beam hardware setup. The proposed PID controller setup is based on a cascaded configuration of an inner PID ball velocity control loop and an outer proportional ball position control loop. The effectiveness of the proposed controller setup was first presented in simulation environment in comparison to a hardware dependent PD cascaded controller, along with a more comprehensive study on possible design approach for optimal PID controller parameters in relation to main functionality of the controller setup. Experimental real-time control results were then obtained on a laboratory setup of the ball and beam system on which PD cascaded controller could not be applied without parallel system model processing.
Keywords: position control, nonlinear system, position error
Published: 15.06.2017; Views: 220; Downloads: 69
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Design of Lyapunov based nonlinear velocity control of electrohydraulic velocity servo systems
Edvard Detiček, Nenad Gubeljak, Mitja Kastrevc, 2017, original scientific article

Abstract: Development of a hydraulically driven process of steel centrifugal die casting industry requires accurate response of position in time. In the frame of preliminary investigations the analysis and control of electrohydraulic velocity servo system is considered in the presence of flow nonlinearities and internal friction. The nonlinear and uncertainty characteristics make the conventional controller not yield to the system high requirements. Two different nonlinear design procedures are employed: feedback linearization and backstepping. It is shown that both these techniques can be successfully used to stabilize any chosen operating point of the system. Additionally, invaluable new insights are gained about the dynamics of the system under consideration. This illustrates that the true potential of constructive nonlinear design lies far beyond the mere task of achieving a desired control objective. All derived results are validated by computer simulation of the nonlinear mathematical model of the system.
Keywords: computer simulation, electro-hydraulic velocity servo system, integrator backstepping, Lyapunov methods, velocity control
Published: 11.07.2017; Views: 230; Downloads: 93
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