해군함정용 디젤엔진 속도제어를 위한 IMC 기반 PID 제어기 설계

Abstract

The Ministry of National Defense of the Republic of Korea is currently conducting a policy study on the design and construction of a medium-sized aircraft carrier capable of operating the KF-21 fighter jet. The current Landing Platform Helicopter(LPH) operated by the Navy will serve as a testbed for improving the initial operational capability of the aircraft carrier significantly. Landing Platform Helicopter(LPH) possesses excellent tracking performance for variations in target rotation speed within the operational requirement area, while also being capable of a robust and stable speed control system in their propulsion engines that can swiftly recover to the original target speed even when unpredictable disturbances such as currents, waves, and gusts occur. Therefore, this paper proposes an IMC-based PID controller with excellent rotational speed control performance and durability for the Pielstic 16PC diesel engine, a medium-speed propulsion system for the transport ships. To obtain a detailed mathematical model that accurately reflects the inherent characteristics of the control subject, the engine assembly and Fuel Control Unit (FCU) are separated and the 3rd-order transfer function is derived utilizing data from trial runs in three different driving modes: low, medium, and high speeds. Then, the 3rd-order model is simplified into a first-order model with time delay to design a PID controller during the model period. The proposed controller is designed to safety disturbance recovery capability and target tracking by composing advantages of IMC, which has only one design variables for filter time constant; and of PID, which has a simple structure. The designed IMC-based PID controller is implemented into the actual engine's nominal and parameter uncertainty process, which is derived from the 3rd-order transfer function, in order to run simulations comprehensively. Thus, the controller's reliability was verified through comparing its performance, robustness, and stability with these of existing reference controller following various evaluation criteria and the value.