• Title/Summary/Keyword: disturbance system

Search Result 2,376, Processing Time 0.034 seconds

Genetic algorithm-based design of a nonlinear PID controller for the temperature control of load-following coolant systems (부하추종 냉각수 시스템의 온도 제어를 위한 유전알고리즘 기반 비선형 PID 제어기 설계)

  • Yu-Soo, LEE;Soon-Kyu, HWANG;Jong-Kap, AHN
    • Journal of the Korean Society of Fisheries and Ocean Technology
    • /
    • v.58 no.4
    • /
    • pp.359-366
    • /
    • 2022
  • In this study, the load fluctuation of the main engine is considered to be a disturbance for the jacket coolant temperature control system of the low-speed two-stroke main diesel engine on the ships. A nonlinear PID temperature control system with satisfactory disturbance rejection performance was designed by rapidly transmitting the load change value to the controller for following the reference set value. The feed-forwarded load fluctuation is considered the set points of the dual loop control system to be changed. Real-coded genetic algorithms were used as an optimization tool to tune the gains for the nonlinear PID controller. ITAE was used as an evaluation function for optimization. For the evaluation function, the engine jacket coolant outlet temperature was considered. As a result of simulating the proposed cascade nonlinear PID control system, it was confirmed that the disturbance caused by the load fluctuation was eliminated with satisfactory performance and that the changed set value was followed.

A Design of Integral Sliding Mode Suspension Controller to Reject the Disturbance Force Acting on the Suspension System in the Magnetically Levitated Train System (자기부상 열차 시스템에서 추진 장치에서 발생하는 부상 간섭력의 영향을 제거하기 위한 적분형 Sliding Mode 부상 제어기 설계)

  • Lee, Jun-Ho
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.17 no.12
    • /
    • pp.1152-1160
    • /
    • 2007
  • In this paper we deal with a design of integral sliding mode controller to reject the disturbance force acting on the suspension system in the magnetically levitated system which is propelled by the linear induction motor. The control scheme comprises an integral controller which is designed for achieving zero steady-state error under step disturbances, and a sliding mode controller which is designed for enhancing robustness under plant uncertainties. A proper continuous design signal is introduced to overcome the chattering problem. The disturbance force produced by the linear motor is formularized by using a curve fitting of the experimental raw data. Computer simulations show the effectiveness of the designed integral sliding mode controller to reject the disturbance force.

Two-dimensional Model Testing System for Analysis of PVD Installation and Soil Disturbance (PVD 설치 및 지반교란의 분석을 위한 2차원 모형실험 시스템)

  • Kim, Jae Hyun;Choo, Yun Wook;Park, Hyun-Il;Kim, Dong-Soo
    • KSCE Journal of Civil and Environmental Engineering Research
    • /
    • v.32 no.4C
    • /
    • pp.149-157
    • /
    • 2012
  • In order to investigate the soil disturbance induced by anchor-shoe for PVD installation and the anchoring mechanism, a new two dimensional testing system was developed. By using the developed testing system, 1g and centrifuge model tests were performed, simulating the driving-retrieval process of both conventional symmetric anchor shoe and new asymmetric anchor shoe. Various size anchor-shoes were simulated and the results were compared. The images recorded during the installation were analyzed by image processing technique. The results of the image analysis presented the clay disturbance depending on the size and type of anchor shoe. In addition, from the retrieval process, the anchoring mechanism was revealed and the holding capacity was measured. As results, the size of anchor shoe influences the soil disturbance and holding capacity. The new asymmetric anchor shoe reduces the soil disturbance and improves anchoring performance.

Real-Time Detection of Seismic Ionospheric Disturbance Using Global Navigation Satellite System Signal (위성항법 신호를 이용한 지진에 의한 전리층 교란 실시간 검출 기법 연구)

  • Song, Junesol;Kang, Seon-Ho;Han, Deok-Hwa;Kim, Bu-Gyeom;Kee, Changdon
    • Journal of the Korean Society for Aeronautical & Space Sciences
    • /
    • v.47 no.8
    • /
    • pp.549-557
    • /
    • 2019
  • In this paper, we focus on the real-time detection method of a seismic ionospheric disturbance using Global Navigation Satellite System (GNSS) signal. First, the monitor for the detection of the seismic ionospheric disturbance is studied based on the estimated ionospheric delay using the GNSS signals. And then, the threshold for the automatic detection is computed. Moreover, to discriminate the seismic ionospheric disturbance against the other ionospheric anomalies due to other error sources such as cycle slips, the signatures of the ionospheric perturbation caused by the seismic wave is investigated. Based on the observation, the detection strategy is proposed. Using GPS observations collected from the 47 permanent stations in South Korea and Japan, the proposed real-time detection method is evaluated.

A controller design for multirate sampled-data systems (Multirate 표본 데이타시스템에 대한 제어기 설계)

  • 이상정;김영백
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 1993.10a
    • /
    • pp.40-46
    • /
    • 1993
  • In this paper, we design a multirate controller for a given multirate sampled-data system which has a periodic output measurement scheme. A sufficient condition for maintaining observability in multirate sampled-data systems is given first. The design strategy for disturbance rejection is proposed. The proposed controller has IMC structure, and can be deomposed into a disturbance estimator and the inverse of fast plants.

  • PDF

Design of Active Disturbance Rejection Control for Inductive Power Transfer Systems

  • Wang, Yanan;Dong, Lei;Liao, Xiaozhong;Ju, Xinglong;Xiao, Furong
    • Journal of Power Electronics
    • /
    • v.18 no.5
    • /
    • pp.1434-1447
    • /
    • 2018
  • The control design of inductive power transfer (IPT) systems has attracted a lot of attention in the field of wireless power transmission. Due to the high-order resonant networks and multiple loads in IPT systems, a simplified model of an IPT system is preferred for analysis and control design, and a controller with strong robustness is required. Hence, an active disturbance rejection control (ADRC) for IPT systems is proposed in this paper. To realize the employment of ADRC, firstly a small-signal model of an LC series-compensative IPT system is derived based on generalized state-space averaging (GSSA), then the ADRC is implemented in the designed IPT system. The ADRC not only provides superior robustness to unknown internal and external disturbances, but also requires few knowledge of the IPT system. Due to the convenient realization of ADRC, the designed IPT system retains its simple structure without any additional circuits. Finally, a frequency domain analysis and experimental results have validated the effectiveness of the employed ADRC, especially its robustness in the presence of frequency drifts and other common disturbances.