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- 저자 : Guangzhu Chen (검색결과 3 건)
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Guangzhu Ding,Lei Chen,Jieping Liu 한국고분자학회 2015 폴리머 Vol.39 No.6
In our previous work, the miscibility and rheology behaviors of poly(3-hydroxybutyrate)/poly(p-vinylphenol) (PHB/PVPh) blends with homogeneous amorphous compositions had been studied. In this work, the rheological characteristics and physical gelation point have been investigated for the miscible PHB/PVPh blends with crystalline/amorphous compositions. The time sweep and frequency sweep of dynamic oscillatory experiment are discussed in details. The storage modulus G’ and loss modulus G’’ grow gradually along with the isothermal crystallization time, but the storage modulus G′ exceeds the loss modulus G″ in the end. The physical gelation phenomena can be observed according to the power law method. In the flat region of loss tangent vs. angular frequency curves, the physical gelation point (tg) of the PHB/PVPh 90/10 comes forth prior to the PHB/PVPh 80/20 during the liquid-solid transition process, which results mainly from the various isothermal crystallization rate of PHB component within PHB/PVPh blends.
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Qing Chen,Guohui Zhang,Kaixuan Wang,Chao Wang,Guangzhu Ding,Jieping Liu 한국고분자학회 2017 Macromolecular Research Vol.25 No.4
The growth of spherulites is an intricate process and the final morphology is dependent on many process conditions. The spherulitic morphologies of poly(3-hydroxybutyrate) (PHB) crystallized from melt film are observed under various crystallization temperature gradient (the non-isothermal crystallization) in this work. Characterization reveals that the crystal morphologies (banded or nonbanded spherulites) of PHB film are determined significantly by nucleation temperature (not growth temperature). Interestingly, banded spherulites, nucleated between 60-135 oC, are able to grow completely above growth temperature 135 oC or below 60 oC yet and non-banded shperulites nucleated at above 135 oC can also develop steadily till below growth temperature 135 oC under temperature gradient condition. Therefore, the conclusion drawn from the temperature gradient or non-isothermal process is novel and different from the result of isothermal crystallization (morphology mainly depending on the growth temperature). In addition, the growth and evolution kinetics of banded and non-banded spherulites are both investigated for some polymer thin films under the temperature gradient in detail.
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Trajectory optimization of an electrohydraulic robot
Xueju Peng,Guangzhu Chen,Yingjie Tang,Changwei Miao,Yang Li 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.10
The electro-hydraulic robot has great driving torque and plays an irreplaceable role in manufacturing. In this paper, a trajectory planning method for a 6-DOF electro-hydraulic robot based on time-energy-jerk is proposed and realized. A multi-objective function of the electro-hydraulic robot about working efficiency, impact, stability and energy consumption factors was built, at the same time, the kinematic and dynamic constraint functions were also built. The multi-objective trajectory function of the robot was optimized by using the nondominated neighborhood immune genetic algorithm, and the optimal position, velocity, acceleration and jerk planning curves of each joint were obtained. In the experiment, the flow output curves of the hydraulic system of joint 6 based on fuzzy-PID control strategy under noload, 1.5 kg load, 4 kg load were obtained, and show that the velocity and position trajectory of the joint can be well controlled using the presented fuzzy PID control strategy.
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