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Author

Ming-Jyi Jang

Other affiliations: National Cheng Kung University
Bio: Ming-Jyi Jang is an academic researcher from Communist University of the Toilers of the East. The author has contributed to research in topics: Nonlinear system & Rotor (electric). The author has an hindex of 14, co-authored 57 publications receiving 1100 citations. Previous affiliations of Ming-Jyi Jang include National Cheng Kung University.


Papers
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Journal ArticleDOI
TL;DR: It is demonstrated that the differential transform is a feasible tool for obtaining the analytic form solutions of linear and nonlinear partial differential equation.

269 citations

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TL;DR: The proposed adaptive grid size procedure provides concise adjustment policy and raises computational efficiency of using differential transformation method to approximate solutions of linear and nonlinear initial-value problems.

172 citations

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TL;DR: In this paper, two sets of controllers corresponding to the static and dynamic friction models are proposed based on the integral type sliding mode control (SMC) law for a conventional ball-screw-driven x-y stage.
Abstract: The demand for high-precision stages has received great attention due to the progress of nano-technology in recent years. Systems to provide long-range and high-precision performance for positioning, tracking and contouring actions have become stringent issues. Among these systems, the ball-screw-driven systems have been widely used in industrial applications and academic researches. In such systems, the friction behavior dominates the resulting performance and is usually known as the stick-slip phenomenon. The friction dynamics can be divided into the static and the dynamic regimes according to the conventional usage. In this paper, friction models are introduced to describe the dynamic behavior of a conventional ball-screw-driven x – y stage. The coherence between the theoretical and experimental data supports the validity of these models. Two sets of controllers corresponding to the static and the dynamic friction models are proposed based on the integral type sliding mode control (SMC) law. Experimental results demonstrate that the system achieves high-precision (10 nm) and long-range (10 cm) positioning performance with repeatability and robustness by the proposed control approaches.

89 citations

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TL;DR: The results show that the proposed controller can steer Chua’s circuit system to the desired state without the chattering phenomenon and abrupt state change.
Abstract: In this paper, a sliding mode controller is applied to control the cubic Chua’s circuit system. The sliding surface of this paper used is one dimension higher than the traditional surface and guarantees its passage through the initial states of the controlled system. Therefore, using the characteristic of this sliding mode we aim to design a controller that can meet the desired specication and use less control energy by comparing with the result in the current existing literature. The results show that the proposed controller can steer Chua’s circuit system to the desired state without the chattering phenomenon and abrupt state change.

76 citations

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TL;DR: The numerical results show that the active magnetic bearing system with an electromagnetic actuator and a flexible rotor exhibits a periodic motion and demonstrates high accuracy and robustness when operating under sliding mode control.
Abstract: This paper presents the analysis and control of active magnetic bearing (AMB) systems with a flexible rotor. A sliding mode controller design scheme is proposed to compensate for the nonlinear effects of the AMB system. A nonlinear model of the AMB system with an electromagnetic actuator and a flexible rotor is proposed to facilitate the present system analysis and controller design. This nonlinear model takes into account the dynamics of the flexible rotor, the characteristics of the nonlinear electromagnetic suspended system, and the contact force between the auxiliary bearing and the shaft. This study also considers the auto-centering control of the AMB system when subjected to disturbances and variations in the system parameters. The numerical results show that the system exhibits a periodic motion and demonstrates high accuracy and robustness when operating under sliding mode control.

74 citations


Cited by
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Journal ArticleDOI
TL;DR: Three-dimensional differential transform method has been introduced and fundamental theorems have been defined for the first time and exact solutions of linear and non-linear systems of partial differential equations have been investigated.

383 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of the squeeze number, nanofluid volume fraction, Hartmann number and heat source parameter on flow and heat transfer was investigated, and the results showed that skin friction coefficient increases with increase of the Nusselt number and Hartmann numbers but it decreases with an increase in the volume fraction.

311 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of Brownian motion and thermophoresis on the heat and mass transfer characteristic of unsteady nanofluid flow between parallel plates is investigated.

236 citations

Journal ArticleDOI
TL;DR: In this article, an alternative approach called the reduced differential transform method (RDTM) is presented to overcome the demerit of complex calculation of DTM, and three test problems of mathematical physics are discussed to illustrate the effectiveness and the performance of RDTM.
Abstract: Recently differential transform method (DTM) has been used to solve various partial differential equations. In this paper, an alternative approach called the reduced differential transform method (RDTM) is presented to overcome the demerit of complex calculation of differential transform method. Comparing the methodology with some known techniques shows that the present approach is effective and powerful. In addition, three test problems of mathematical physics are discussed to illustrate the effectiveness and the performance of the reduced differential transform method.

219 citations