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Nhat-Binh Le,Kwon-Soon Lee,Young-Bok Kim 한국항해항만학회 2017 한국항해항만학회지 Vol.41 No.5
In the offshore crane system, the requirements on the operating safety are extremely high due to many external factors. Rope extension is one of the factors producing vertical vibration of load. In this study, the load is carried by the motor-winch actuator control and the rope is modeled as a mass-damper-spring system. To control the load position and suppress the vertical vibration of the load, a control system based on input-output linearization method is proposed. By the simulation and experiment results with pilot crane model, the effectiveness of proposed control method is evaluated and verified.
Le Cuong Nhat,Kim Hyun Woo,Baek In Hyung,Bark Hyeon Sang,Shin Junho,Jang Kyu-Ha,Cho Sunglae,Jeong Young Uk,Oang Key Young,Lee Kitae 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.81 No.5
In this paper, we report the structural dynamics of polycrystalline bismuth (Bi) thin flms in response to photoexcitation, visualized by mega-electron-volt ultrafast electron difraction. The data reveal that the carrier–phonon scattering process involves phonon squeezing within sub-picoseconds (ps) and lattice thermalization within a few ps. Through the time-resolved pair distribution function analysis, we directly observe the changes in the interatomic distance of adjacent Bi atoms in real space, which can be explained by phonon softening and subsequent phonon squeezing.
A Study on Load Vibration Control in Crane Operating
Nhat Binh Le,Dong Hun Lee,Tae Wan Kim,Young Bok Kim 한국항해항만학회 2017 한국항해항만학회 학술대회논문집 Vol.2017 No.추계
In the offshore crane system, the requirements on the operating safety are extremely high due to many external factors. This paper describes a model for studying the dynamic behavior of the offshore crane system. The obtained model allows to evaluate the fluctuations of the load arising from the elasticity of the rope. Especially, in this paper, the authors design control system in which just winch rotation angle and rope tension are used without load position information. The controller design based on input-output feedback linearization theory is presented which can handle the effect of the elasticity of the rope and track the load target trajectory input. Besides that, a full order observer is designed to estimate unknown states. Finally, By the experiment results, the effectiveness of proposed control method is evaluated and verified.
Le, Nhat-Binh,Lee, Kwon-Soon,Kim, Young-Bok Korean Institute of Navigation and Port Research 2017 한국항해항만학회지 Vol.41 No.5
In the offshore crane system, the requirements on the operating safety are extremely high due to many external factors. Rope extension is one of the factors producing vertical vibration of load. In this study, the load is carried by the motor-winch actuator control and the rope is modeled as a mass-damper-spring system. To control the load position and suppress the vertical vibration of the load, a control system based on input-output linearization method is proposed. By the simulation and experiment results with pilot crane model, the effectiveness of proposed control method is evaluated and verified.
Quang Nhat Le,Vo Nguyen Quoc Bao,안병구 한국통신학회 2018 Journal of communications and networks Vol.20 No.1
We analyze the effect of distributed switch and stay combining(DSSC) technique and imperfect channel state information(CSI) in the scenario, where the communication between the sourceand the destination is conducted through either the direct transmissionor with the help of the best relay among K full-duplexenergy harvesting relays by using partial relay selection. To activatesuch communication, at the destination, we apply DSSC technique,which is considered as an effective method to achieve spatialdiversity in a distributed manner with low processing complexityand compatibility to resource-constrained wireless networks. Consideringtwo popular relaying protocols, i.e., decode-and-forward(DF) and amplify-and-forward (AF), the performance analysis interms of outage probability (OP) is carried out. Numerical resultsshow that imperfect CSI has a negative impact on system performance. Besides that, our DSSC-full duplex selection relaying(FDSSCSR) system achieves a better performance in terms of outageprobability than that of the DSSC-half duplex selection relaying(HDSSCSR) and the full duplex/half duplex dual hop relayingwith partial relay selection (FD/HDDRPRS) systems. Simulationresults are conducted to verify the correctness of our analysis.