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Master's Dissertation
Full name
Evaldo Ferezin
Knowledge Area
Date of Defense
São Carlos, 2006
Felício, Luiz Carlos (President)
Franzotti, Celso Luiz
Trindade, Marcelo Areias
Title in Portuguese
Modelagem dinâmica de transdutor de pressão piezorresistivo para sistemas hidráulicos através de dados experimentais da resposta à entrada degrau
Keywords in Portuguese
Dinâmica transdutor pressão
Modelagem dinâmica experimental
Abstract in Portuguese
Este trabalho apresenta a modelagem da parte dinâmica de dois transdutores de pressão tipo piezorresistivo. Geralmente processos de calibração dinâmica usam bancadas sofisticadas, mas neste trabalho procurou-se um processo simples e de baixo custo. A metodologia baseou-se em aumentar lentamente a pressão, fornecida por um sistema hidráulico básico, até que ocorresse a explosão de um diafragma e, com isso, obteve-se um degrau de pressão, supostamente ideal. Considerado como sistemas lineares, com a resposta obtida verificou-se qual a ordem e o tipo de sistema correspondente à resposta do transdutor. Através dos dados experimentais determinou-se os parâmetros dinâmicos do modelo matemático. Foram obtidos modelos matemáticos lineares de segunda ordem de cada transdutor. As respostas dos modelos mostram ter uma concordância satisfatória quando comparadas aos dados experimentais.
Title in English
Dynamic modeling for hydraulic piezoresistive pressure transducer using experimental responses due to step inputs
Keywords in English
Dynamic pressure transducer
Experimental dynamic modeling
Abstract in English
This work presents a dynamic modeling method for two hydraulic piezoresistive pressure transducers. Usually the dynamic calibration processes apply sophisticated devices, but in this work a simple and low cost process was searched. The methodology was based on increasing the pressure slowly, supplied by a basic hydraulic system, up to a diaphragm explosion, assumed as an ideal step pressure variation. Considered as linear systems, the responses obtained were verified and compared with a second order linear system. Using the experimental data, the dynamic parameters of the mathematical model were determined for each of the two transducers. The theoretical responses of the models showed to have a satisfactory agreement when compared with the experimental data.
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