H309 MODELING TRANSFER FUNCTION OF AN ELECTRIC AIR HEATER AND COMPARISON OF CONTROL PERFORMANCES ACCORDING TO CONTROL STRATEGIES(Heat transfer control)

概要

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Precise and robust control of thermal-fluid systems is important in view of energy saving and industrial requirements for faster dynamic responses. Such performance can be attained when model transfer function is exact. Unfortunately, most thermal-fluid processes can be approximated as first order transfer function with time delay at best because of their nonlinear nature. This study derives semi-empirical transfer function for an electric heater as a function of throughput. Popular PID controllers and Smith predictor are tested for robustness in terms of model errors and uncontrollability parameter Pu. When Pu is less than 0.1, the controllers are robust to model errors. For Pu larger than 0.1, Smith predictor requires precise modeling of the process, especially the time delay. The PID controller for a process with Pu less than 0.1 shows robustness against varying throughput when PID parameters are updated on-line based on ITAE tuning formula.
一般社団法人日本機械学会の論文
2000-10-01