Pinsopon, Unnat

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Pinsopon, Unnat
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unnat.pi@kmitl.ac.th

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    Friction Compensated Force Control of Electro-Hydraulic System Using Fuzzy Controller
    (2022-10-31)
    Chanbua, Weerapong
    ;
    Pinsopon, Unnat
    Steady state and dynamic LuGre friction models of an electro-hydraulic system were constructed. Indirect electro-hydraulic cylinder force control under friction compensated PID and fuzzy controllers were tested and compared. Feedback force signal was indirectly measured and calculated from pressures to emulate the applications that direct force measurement is impossible. Estimated friction was compensated to desired force command of the PID controller. The proposed fuzzy controller contained two modules. The first, as a friction compensator, calculated modified error according to estimated friction and feedback force error. The second module calculated control action based on PD control scheme. Friction compensated PID and fuzzy controllers could reduce tracking errors at the maximum force commands by 80% and 90%, respectively, compared to the PID controller without compensation. The steady state friction compensation yielded better tracking performances compared to the dynamic friction. Tracking performance of the fuzzy controller was always better than the PID controller
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    Friction Compensated Fuzzy Force Tracking Control of Electro-Hydraulic System
    (2020-04-01)
    Chanbua, Weerapong
    ;
    Pinsopon, Unnat
    Friction is one of the main cause that affects the tracking accuracy of the control system. This study presents the steady state friction estimation in a hydraulic cylinder. Cylinder force tracking of PID and fuzzy PD control systems under friction compensated reference were tested and compared. Fuzzy control system, which has a more design flexibility compared with PID, yielded a better tracking performance, with 10% and 14% better in average tracking error at maximum compression and RMS error, respectively.
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    PID electro-hydraulic cylinder force tracking system with friction compensation
    (2018-08-14)
    Chanbua, Weerapong
    ;
    Pinsopon, Unnat
    Friction can be found in all mechanical systems, and is the cause of control tracking error. In this article, LuGre friction model for symmetric hydraulic cylinder was studied and obtained experimentally. The estimated friction force was applied for reference force compensation. Force tracking performances of PID force control systems with and without friction compensation were tested and compared. Control system with friction compensation outperformed one without in all cases of tracking tests. The best result was found in the square force tracking tests, with an average error at maximum compression force of 86.105 N in the case of with friction compensation compared with error of 511.996 N in the case without. However, the estimated friction achieved in the study was noisy. This is due to the use of noisy numerically differentiated velocity signal in the friction estimation procedure.
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    Influence of RBD palm olein on hydraulic pump performance
    (2014-01-01)
    Chanbua, Weerapong
    ;
    Pinsopon, Unnat
    At the present time, researchers try to find alternative fluids for being used as lubricants or hydraulic fluids that are biodegradable and environmental friendly. In this study, Refined- Bleached-Deodorized (RBD) palm olein was investigated whether it is such a potential candidate. RBD palm olein could be easily acquired since it is of the type used as cooking oil. The physical properties of both conventional hydraulic oil and RBD palm olein were tested and compared by an accredited laboratory. The performance of the hydraulic systems when using both fluids as working mediums were also tested and compared. The experimental results show that temperature significantly affected the performance of the hydraulic system when using conventional hydraulic oil, whereas the performance of the hydraulic system when using RBD palm olein barely changed with temperatures. At the temperatures below 60°C, the RBD palm olein yielded less flow rate and less energy efficiency. However, for the temperatures above 60°C, the RBD palm olein yielded slightly more flow rate and slightly more energy efficiency. It can be confirmed from this study that RBD palm olein can be used as an alternative hydraulic fluid. © (2014) Trans Tech Publications, Switzerland.