| Summary: | 碩士 === 國立雲林科技大學 === 環境與安全衛生工程系碩士班 === 99 === System Dynamics with systems analysis, information feedback, control theory and computer simulation of system behavior, decision-making Process and the time delay and so on, in this study for the automatic control unit operations of fluid flow experiments, with VENSIM simulation and LabVIEW control. Information and feedback from the system fluid and time delay in the correction LabVIEW automation control and signal acquisition, the electronic device measuring differences in fluid velocity and temperature will also affect the signal feedback, the temperature increases, the error range increases, the system feedback increased risk of miscarriage of justice.
When the steady-state experimental valve opening is greater than 35%, flow and pressure can be stabilized until the valve is opened to 85%, flow that is not increased. After the dynamic test flow delayed effects about 10 seconds, the pressure is about 5 seconds, to understand the reasons for the delay and time, the operator can provide the use of appropriate control strategies. In steady state experiments such as goals seeking curves behavior of fluid, dynamic experiments are like S-shaped growth curve, or maximum value near the goal behavior when the shock behavior, because part of the interference from the detection of errors caused? the other part of the delay effect the performance of the system behavior. Using VENSIM simulation fluid system, whether it is single-loop or double-loop simulation in steady state and dynamic, temperature changes can also be included, and the fast simulation time and number of adjustable parameters. In the future simulation can be expanded around impact of environment variables, different characteristics of the fluid and the change due to different systems, so as to act as an automatic control system of the reference.
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