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Adaptive sliding mode control of overhead cranes with varying cable length
Le Anh Tuan,문상찬,이원구,이순걸 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.3
An overhead crane transports cargoes of various weights and volumes depending on the operation case. Friction factors characterized by damped coefficients are changeable in terms of the operating environment. In this study, an adaptive version of the sliding mode control of a crane system is developed in the case of no priori knowledge of the payload mass and damped elements. Using two inputs, namely, trolley driving force and cargo lifting force, the proposed adaptive robust controller simultaneously executes four duties, including tracking the trolley, hoisting the cargo, keeping the cargo swing small during transient state, and completely eliminating the payload angle at steady destination. Numerical simulations and experiments are conducted to investigate the quality of the proposed controller. The results show that the proposed controller works well and all system responses are asymptotically stabilized.
Sliding mode controls of double-pendulum crane systems
Le Anh Tuan,이순걸 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.6
This study focuses on the design of robust nonlinear controllers based on both conventional and hierarchical sliding mode techniques for double-pendulum overhead crane systems. In the first approach, a first-order sliding surface is provided and a proper control scheme is generated to stabilize the surface. In the second approach, two levels of sliding surfaces are proposed and the control scheme is designed based on the stability of the second-level surface. We also prove the stability of the first-level sliding surface. To verify the quality of the proposed controllers, simulation for a particular type of overhead crane systems is implemented. Simulation results show that all state trajectories asymptotically converged to desired values.
Band-Stop Filter Analysis and Design for 1D Magnetic Particle Imaging Hybrid System
Le, Tuan-Anh,Asl, Hamed Jabbari,Do, Ton Duc,Kim, Myeong Ok,Yoon, Jungwon American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.8
<P>When converting the received signal from an analog signal into a digital signal, the analog-to-digital converter (ADC) is not capable of resolving both signals: the particle signal u(P)(t) and the excitation signal u(E)(t), so our system needs a band-stop filter (BSF) to filter out the excitation signal from the received signal before using the ADC. In this paper, we numerically investigate the filtering method and the effect of BSF on the MPI imaging. It is shown that the attenuation level of the filter is important in order to make the possibility of the restoring the linearity and shift invariance properties of the MPI image. These properties are important in diagnosis medical applications. Finally, we propose guidelines for designing the BSF.</P>
A Formal Synthesis of (+)-Epiquinamide
( Le Anh Tuan ),( Guncheol Kim ) 충남대학교 기초과학연구원 2017 충남과학연구지 Vol.34 No.1
For the synthesis of quinolizidine alkaloid, epiquinamide (4), the common synthetic precursor 1-hydroxyquinolizidinone has been an attractive target for many research groups recently. To prepare this intermediate, we have developed a new route using an epoxide.