Leo Kunigk

An Educational Tool with Remote Access for Teaching Modelling Control Systems for Engineering Courses

This paper presents the use of a teaching tool that allows the temperature control and the system identification by Weighted Least Square Method. The system is an application of remote access laboratory, a WebLab, with real equipments and systems that can be remotely controlled by the web. At the approach, the WebLab allows the development of multidisciplinary experiments related to modelling control systems and is used as a tool for engineering education and for research projects.

CONSTRUÇÃO DE BANCADA EXPERIMENTAL PARA ESTUDO DO COMPORTAMENTO DO TEOR DE UMIDADE RESIDUAL PRESENTE NO MATERIAL RETIDO UTILIZANDO PENEIRA VIBRATÓRIA

Durante o processo de perfuração de poços de petróleo a utilização de fluido de perfuração é de suma importância, devido às diversas funções que ele desempenha, como: estabilização do poço, carreamento do cascalho proveniente do corte das rochas, lubrificação e resfriamento da broca entre muitos outros. Devido a este fato, as características físicas do fluido devem permanecer constantes durante todo o processo, sendo necessário o controle da concentração de sólidos que é feito através de uma unidade de separação sólido líquido. O peneiramento é a primeira etapa utilizada em uma unidade típica de separação sólido-líquido, seguida posteriormente de bateria de hidrocicliones e centrífugas decantadoras. Este trabalho visa o estudo relacionado à primeira etapa, através da utilização da peneira vibratória e o levantamento da influência do fator adimensional força-g sobre o teor de umidade arrastado juntamente com os sólidos separados em protótipo de peneira vibratória, equipado com tela de 175 mesh. além da apresentação da instrumentação e sistema de controle empregados na bancada experimental. Os resultados demonstraram que o aumento do valor do adimensional força-g contribuiu para a diminuição da umidade residual do sólido retido pela peneira, os ensaios também demonstraram que o controle agiu de forma satisfatória durante o processo, sendo capaz de manter a força-g constante mesmo com as variações de quantidade de massa sob a peneira.

Evaluation of Water Consumption and Neuro-Fuzzy Model of the Detergent Leavings Kinetics’ Removal in a Clean in Place System

This work has focused on describing the water consumption and the Neuro-Fuzzy model of the detergent leavings kinetics’ removal of a CIP System, based on the pH measured. The plant dynamics has been identified for different operational conditions. A flowrate value of 10.5 L.min−1 has been proved to be effective in order to provide the minimum required rinse water volume to execute the stage of the CIP system, which means that it is possible to optimize the process reducing energy, water and steam consumption as well as the time of unused machinery bringing productivity gains. The obtained models, allowed the prediction of the system dynamics behavior. The results were validated when compared with the experimental data. Three triangular membership functions for the input data modeled accordingly the pH dynamics with an error of 0.011 when comparing the validation data and the obtained model.

WEBLAB FOR CONTROL APPLICATIONS IN ENGINEERING EDUCATION

This paper presents the use of a remote access laboratory, a WebLab, with real equipments and systems that can be controlled remotely by the web. At the approach, the WebLab allows the development of multidisciplinary experiments in control and automation areas that can be used as a tool for engineering education and for research projects. This first WebLab includes an application that allows the remote access using a page on internet for drive control of a DC motor. Using this application the user can perform experiments as the open loop test in DC motor in order to obtain non-parametric system model and tuning of PID controller to ensure efficient speed and position motor control.

Experimental Investigation about Rinse Water Consumption of a CIP Process Applied to a Shell and Tube Exchanger

This paper focused the CIP (clean in place) rinse stage, typically applied to the food industry. The dynamic behavior of residuals removal kinetics was studied, to obtain mathematical models that describe adequately the system. The optimization of water, detergent, etc., is the next goal. The obtained results show that the temperature influence can be neglected in comparison with the rinse water flow rate considering the cleaning process. The systems dynamics are non linear and were adequately represented by 1st order plus dead time transfer functions. The flow models obtained with this paper were validated versus experimental data and the results were close with respect to the last ones.