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Truong, Quang-Trung,Pokharel, Pashupati,Song, Gwang Seok,Lee, Dai-Soo American Scientific Publishers 2012 Journal of Nanoscience and Nanotechnology Vol.12 No.5
<P>A new method for the preparation of graphene nanoplatelets (GNP) from graphite intercalation compounds (GICs) was investigated. Donor-type ternary GICs of natural graphites, lithium ions and tetrahydrofurane (NG-Li-THF) were synthesized via a solution process, with the lithium ions in the GICs then exchanged with different tetra alkyl ammonium cations to expand the interlayer distance (d-spacing) of these GICs. Microwave irradiation of these GICs resulted in the exfoliation of GICs, forming so-called 'worm-like exfoliated graphites.' Sonication of the worm-like exfoliated graphites in acetone resulted in GNPs with different aspect ratios. Powder X-ray diffractometry, scanning electron microscopy and transmission electron microscopy were employed to characterize the GICs and GNPs. It was found that the ion-exchange of NG-Li-THF increased the volume expansion ratios, and the molecular structure of the tetra alkyl ammonium cations affected the aspect ratios of the GNPs after exfoliation.</P>
DINH QUANG TRUONG,안경관,BUINGOC MINH TRUONG,Nguyen Thanh Trung,Syed Abu Nahian 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.3
This paper presents a simple and effective force reflecting joystick controller for applications to bilateral teleoperation in construction machinery. First, this controller is a combination of an advanced force reflecting gain tuner and two local adaptive controllers, master and slave. Second, the force reflecting gain tuner is effectively designed using recursive least square method and fuzzy logics to estimate directly and accurately the environmental characteristics and, consequently, to produce properly a force reflection. Third, the local adaptive controllers are simply designed using fuzzy technique and optimized using a smart leaning mechanism to ensure that the slave follows well any given trajectory while the operator is able to achieve truly physical perception of interactions at the remote site. An experimental master-slave manipulator is setup and real-time control tests are carried out under various environmental conditions to evaluate the effectiveness of the proposed controller.
Truong, Dinh Quang,Ahn, Kyoung Kwan,Trung, Nguyen Thanh,Lee, Jae Shin SAGE Publications 2013 Proceedings of the Institution of Mechanical Engin Vol.227 No.10
<P>Variable-displacement vane-type oil pumps represent one of the most innovative pump types for industrial applications, especially for engine lubrication systems. The aim of this paper is to develop a complete and accurate mathematical model for a typical variable-displacement vane-type oil pump to investigate its working performance. First, the detailed theoretical model was built on the basis of pump geometric design and dynamic analyses. Next, numerical simulations with the constructed model and experiments on the actual pump system were carried out to analyse the main power loss factors in order to develop the complete model for high modelling accuracy. The estimated pump performance using the complete pump model was finally verified by numerical simulations in comparison with practical tests.</P>
Theoretical investigation of a variable displacement vane-type oil pump
Truong, Dinh Quang,Ahn, Kyoung Kwan,Trung, Nguyen Thanh,Lee, Jae Shin SAGE Publications 2013 Proceedings of the Institution of Mechanical Engin Vol.227 No.3
<P>Variable displacement vane-type oil pumps represent one of the most innovative pump types for industrial applications, especially for engine lubrication systems. This article deals with a mathematical modeling method for theoretical performance investigation of a typical variable displacement vane-type oil pump. This theoretical model is based on the pump geometric design and dynamic analyses. It can be considered as a generation step for a deeper understanding of the pump operation as well as for effectively implementing the pump control mechanisms to satisfy the urgent demands of engine lubrication systems. The developed theoretical pump model is finally illustrated by numerical simulations.</P>
Effect of Flexibility performance of hindwing in maneuvering flight of beetle (Allomyrina Dichotoma)
Trung-Hieu Tran,Tien Van Truong,Tuyen Le Quang,Doyoung Byun,Hoon Cheol Park 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
High ability of maneuvering and self stability of insect flight have been interesting topic for biology researchers recently. Here we investigate kinematics and role of flexibility of hind wing of Allomyrina Dichtoma in side and back turnings. Body and wing kinematics were reconstructed into three-dimensional through DLT method. Result shows that a flexibility of hindwing can increase performance significantly in turning and stability control of beetle especially in supination and pronation phases. In the downstroke phase, hindwing has positive wing camber, inversely, it is passive deformed into negative wing camber in chordwise as well as in spanwise direction at begin of upstroke. These mechanisms can create a large variant of force and moment in magnitude and direction which can change direction and altitude of beetle in maneuvering.
Maneuvering flight of beetle (Allomyrina Dichotoma)
Trung-Hieu Tran,Tien Van Truong,Tuyen Quang Le,Hoon Cheol Park,Doyoung Byun 한국항공우주학회 2009 한국항공우주학회 학술발표회 논문집 Vol.2009 No.11
Maneuvering flight has been recognized as an important characteristic of insects and animals where these species frequently use. Here we investigate kinematics and role of flexibility of hind wing of Allomyrina Dichtoma in which body and wing kinematics were reconstructed into three?dimensional through DLT method. Result shows that a flexibility of hind wing can increase performance significantly in turning and stability control of beetle especially in supination and pronation phases. In the downstroke phase, hindwing has positive wing camber, inversely, it is passive deformed into negative wing camber in chordwise as well as in span wise direction at begin of upstroke. These mechanisms can create a large variant of force and moment In magnitude and direction which can change direction and altitude of beetle in maneuvering.
Vortex shedding in free-flying beetles
Tien Van Truong,Hieu Trung Tran,Tuyen Quang Le,Hoon Cheol Park(박훈철),Doyoung Byun(변도영) 한국항공우주학회 2009 한국항공우주학회 학술발표회 논문집 Vol.2009 No.11
The detail of the field of air flow around the wings of free-flying beetle is presented by using smoke wire visualization technique. It is apparent that beetle is unusual in comparison with other insects, it has a pair of an elytron and a hind wing. Hence, vortices are generated by movement of both wings and wing-wing interaction. The images show that the vortex generated by eytron is strongly influence the vortex dynamic generated by hind wings. In forward flight, the leading edge vortex (LEV) of both wings grew in size and shed during downstroke, meanwhile the trailing edge vortex (TEV) is formed in supination. The formation of LEV on elytron highlights that total aerodynamic force of beetle can be improved by eytron.