Wongvanich, Napasool
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Preferred name
Wongvanich, Napasool
Alternative Name
Wongvanich, N.
Main Affiliation
Email
napasool.wo@kmitl.ac.th
40 results
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Item type:Publication, Agricultural Mobile Robot Body Vibration Characterization Using Integral Based Methodology(2019-04-01); Panaudomsap, SumitThis paper presents the application of integral based method for characterization of the vibration in the four-wheel agricultural mobile robot, which is designed for use in applications such trimming, spraying and harvesting. Vibration occurs when one of the wheels does not touch the ground which reduces an effective of end effector. In order to design an effective controller, an accurate mathematical model is needed. Results show that the proposed method can simplify the system identification procedure, while yielding excellent match in comparison to the standard black box method. The proposed algorithm gave an NRMSE match of 96.8%, while the standard method yielded a 76.1% match. This match is also found to be lower when the validation data was from other experiments. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Robust Practical Fixed-Time Control and Application to DC-DC Buck Converter(2024-01-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A study of flow-level cascade control with WirelessHARTTM transmitter using LabVIEW(2017-12-13) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Age structural model of the hand foot mouth disease in Thailand(2018-12-01); The hand foot mouth disease (HFMD) is a virulent disease caused by virus of the enteroviruses serotypes, whose symptoms include soreness inside or around the mouth, and rashes or blisters on the hands, feet or legs. Most cases are seen in infant and children. The severity of HFMD outbreaks has thus constituted serious threat to general public health. In this work, the transmission model of the HFMD is formulated. Specifically, the population is divided into two subclasses, namely, those under the age of ten, and those over the age of ten. Two SEIR models, one for each subclasses, are then formed. This model is then analyzed through the use of standard dynamical systems method, where two equilibriums of the model, namely the disease-free equilibrium, and the endemic equilibrium, are firstly determined. Stability analyses of the respective equilibriums are then conducted. Results show that the disease-free equilibrium will be stable if the basic reproduction number is less than one, while the endemic equilibrium is stable when the basic reproduction number exceeds unity. These results can be used in controlling the epidemics of the HFMD. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Optimization Based Dynamics Setpoint Control to Improve Cycle Power Efficiency of The Lm6000pf+ Aero Gas Turbine(2021-01-01) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Comparative study of character recognition on Thai license plate using DCT and FIR system(2018-12-10); Gulpanich, SuphanThai characters have rather similar shapes, which they are not same as English characters that have distinct shapes. Thereby, performing of Thai character recognition is not simple. In this paper, the recognition of characters and numbers on Thai license plate using DCT and FIR system methods is proposed and compared base on recognition rate. There are two ways of studying in DCT method. First, compute the coefficients of 1D-DCT by separation in the horizontal and vertical complements of character and represent them as the features of character. Second, combine the coefficients of 1D-DCT at each component in form of power spectrum of DCT and use it as the character features. For FIR system method, the impulse responses of FIR system are used as the features of character. The 120 car images under variant illumination conditions are used to testing all three methods. Moreover, some images are incomplete conditions such peeling paint, stained with slush and so on. In the results, the success of recognition rate for separation of DCT coefficients, power spectrum of DCT and FIR system methods was 99.15%, 48.30% and 98.30%, respectively. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Robust Variable Exponent Fixed-Time Speed Control of PMSMs Based on a Fixed-Time Sliding Mode Observer(2025-01-01); This paper presents a state-dependent variable exponent coefficient sliding mode control (VECFSMC). By inducing fixed-time stability analysis, the proposed state-dependent sliding surface provides not only system stability but also a quick response in a fixed period of time. To enhance the controller's ability to direct state trajectories along the sliding surface manifold towards equilibrium and attain the desired outputs despite the presence of disturbances, a fixed-time sliding-mode observer (FTSMO) has been created. The approach is assessed by Lyapunov stability analysis. Eventually, a numerical simulation of composited fixed-time Controller and fixed time Observer evidently shows fast convergence, high robustness against lump disturbances. The proposed technique, along with the fixed-time observer, achieves global fixed-time stabilization and offers straightforward implementation compared to other fixed-time methods, requiring the tuning of fewer parameters. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, The Lyapunov Analyses of MERS-Cov Transmission in Thailand(2019-01-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Extended Exploration Grey Wolf Optimization, CFOA-Based Circuit Implementation of the sigr Function and its Applications in Finite-Time Terminal Sliding Mode Control(2023-01-01); ; The development of closed-loop circuit realizations of chaotic synchronization and control is considered a promising aspect of analog electronics. Therefore, this paper explores the use of the sigr function in the implementation of finite-time terminal sliding mode control. A CFOA-based implementation of the sigr function is proposed, whereby an Extended Exploration Grey Wolf Optimization method is used to approximate the non-integer powered transfer function inside the sigr function. This configuration also allows for a parallel configuration in which each coefficient of the transfer function can be independently and elaborately tuned. Two closed-loop circuit realizations of second- and third-order systems are presented to demonstrate the effectiveness of the developed sigr function to achieve finite-time terminal sliding mode control. For the second-order system, the terminal sliding mode control is applied to stabilize the chaos in the Holmes-Duffing system in finite time, and for the third-order system, active stabilization of the modified Sprott-C chaotic system is presented. The results show that finite-time control has been satisfactorily achieved in both cases, both in computer simulations and in circuit implementations. Specifically, the second-order closed-loop circuit implementation yielded a maximum error of 1.11%, while the third-order closed-loop circuit implementation had a maximum error of 2.89%. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, LQR/PID controller design of PLC-based inverted pendulum(2018-01-01);