1,720,979 research outputs found
MULTIFUNCTIONAL REMOTE LABORATORY FOR EDUCATION IN AUTOMATIC CONTROL: THE CRAUTOLAB EXPERIENCE
No full textThis paper describes the experience gathered in the last years due to the creation and development of an automatic control laboratory suitable for remote use via the Web. First, the principles that guide the laboratory design and evolution are stated and motivated. Then, an overview of the laboratory is given, describing its architecture and the most important technological solutions adopted. The available experiments are described, and some pedagogical considerations are reported. Finally, some general ideas are presented that reflect the authors’ experience and opinion on the use of remote laboratories in control education
WEB-ENABLED LABORATORY ON THE IMPLEMENTATION OF INDUSTRIAL CONTROLLERS
No full textA web-enabled simulation laboratory is presented. The users can experiment with various control structures and interact with the code, learning how control functions are implemented in industrial regulators and control structures. The laboratory is nased on LabVIEW web server technology. It allows remote experiments, involving both simulated and physical cintrol systems. All the experiments are accessible with a browser, and the code realising the experiments is available for download
Autotuning in Cascaded Systems Based on a Single Relay Experiment
No full textThis manuscript deals with the automatic tuning of cascade control systems, that are frequently encountered in process control. A tuning method is presented, the main goal of which is to be simple to operate, and introduce a moderate process upset. The method combines an ad hoc relay-based identification procedure based on a single test, a specific choice of the controller blocks’ structure, and a set of tuning rules based on a particular use of the well known IMC principle. Simulations are reported to illustrate the effectiveness of the proposal within its applicability limits, that are characterised as rigorously as possible, and may be widened by some of the envisaged extensions
Quality Indices for the Autotuning of Industrial Regulators
No full textWith reference to the model-based autotuning of industrial regulators, like PIs or PIDs, this study proposes some indices to evaluate the obtained tuning, including its robustness against model errors, in a more informative and straightforward way with respect to traditional ones such as the phase margin. As a by-product, the proposed indices allow one to express the regulator in alternate ways, so as to ease the possible optimisation-based tuning procedures (a matter just sketched herein owing to space limitations). Some example tuning methods are presented to illustrate the idea. Simulation tests and a laboratory application are reported
Automatic generation of LFTs from object-oriented Modelica models
No full textLinear Fractional Transformations (LFT) are a widely used model description formalism in modern control and system identification theory. Deriving such models from physical first principles is a non-trivial and often tedious process, if carried out manually. Tools already exist to transform symbolic transfer functions and symbolic state-space representations into reduced-order LFTs, but these descriptions are still quite far from a natural, physical-based, object oriented description of physical and technological systems.
This paper presents a new approach to obtain reduced-order LFT models starting from equation-based, object-oriented descriptions of the plant dynamics, formulated using the Modelica language. This allows to reduce the gap between user-friendly model representations, based on object diagrams with physical connections, block diagrams with signal connection, and generic
differential-algebraic models, and the use of advanced LFTbased
control techniques.
The presented approach can be applied to any process model which is linear in its variables, including models with implicit algebraic equations and higher-index models
- …
