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Research on Modeling for Electric-pneumatic Positioning System of Actuator

Author: GaoHeng
Tutor: ShangQunLi
School: Hangzhou University of Electronic Science and Technology
Course: Detection Technology and Automation
Keywords: Torque motor Nozzle - flapper valve Pneumatic Relay Mathematical model Least Squares
CLC: TP21
Type: Master's thesis
Year: 2009
Downloads: 45
Quote: 1
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Abstract


Actuators are essential throughout the automation system, the terminal performs important element in the process industry plays an important role. Actuator technology profoundly affect the production of quality, efficiency, safety and environmental protection. Pneumatic technology with its unique advantages in industrial production has been widely used. Pneumatic actuator technology, in addition to the materials and processing technology, institutional and structural design, intelligent and network, etc. to enhance the level of pure technical level, the more important is the need actuator pneumatic positioning system modeling based on the application of this theory research. Actuator pneumatic positioning system modeling study is to obtain as FISHER, SIEMENS technical indicators such as the company's high-performance, high reliability, structural optimization of actuator technology based products and key. Mathematical model is an abstract description of object properties is a direct reflection of the object properties. Model for smart valve positioner control algorithm design, optimization control valve, actuator fault diagnosis foundation. First, the analysis of a new working principle of the torque motor, the torque motor of the new analysis were carried out magnetic circuit analysis, and then create the new dynamic equation of the torque motor; with the knowledge and laws of aerodynamics , established a fixed orifice nozzle and the nozzle mouth of the weight of the gas flow equation, and then, to do a certain assumptions and approximations, set up with a load chamber nozzle - damper mechanism dynamic equation; facilitate analysis and research issues from departure, according to the actual situation of the study made certain assumptions, combining thermodynamics, fluid mechanics basics and law establishing a pneumatic actuator dynamics following equation. Secondly, the pneumatic actuator movement is divided into two parts to study, through the film chamber and implementing agencies working mechanism analysis, combined with the knowledge of thermodynamics and kinetics, the establishment of the film chamber thermodynamic equation and actuators force balance equation . Finally, set the measuring torque motor displacement of the movable iron piece experimental platform, based on experimental data, once completed by the least squares algorithm for identification of unknown parameters in the model, the simulation model and experimental data comparison; elaborate built several parts get the unknown parameters in the model approach. Based on the research aspects of hydraulic and pneumatic literature, based on the one hand, the study electric - gas valve positioner (including torque motors, nozzles - Following the flapper valve and pneumatic actuator) works on the basis of established respectively Locator various parts of the model; the other hand, the analysis of the working mechanism of the actuator on the basis of established film chamber thermodynamic equations and actuator force balance equation; finally build a torque motor displacement measurement experimental platform to identify the torque motor unknown parameters in the model.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation components,parts
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