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Transforming method of TLCD-structure to TMD-structure for vibration control
Chuan Fu 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.4
Tuned Liquid Column Damper (TLCD) relies on the motion of a liquid mass in an open tube counteract the external motion, whilea built-in orifice plate induces turbulent damping forces that dissipate kinetic energy. Although both the construction and workingprinciple of TLCD differ from Tuned Mass Damper (TMD), the analogies between TLCD-structure and TMD-structure system forsymmetric and asymmetric structures are given. The mass ratio, the optimal frequency ratio, the natural frequency and damping ofthe main structure, etc are achieved. Modal tuning of the TLCD, frequency ratio and damping, is classically done by applying theDen Hartog optimization criterion. The analysis of structural vibration control using finite element software is presented. Numericalsimulations of the four-storey asymmetric structure and 20-storey benchmark model with single TLCD or TLCDs with theparameters using Den Hartog formula and structural analysis by SAP 2000 software show that the method of transforming TLCDstructureto TMD-structure system is reasonable and feasible.
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Passive vibration control of plan-asymmetric buildings using tuned liquid column gas dampers
Chuan Fu 국제구조공학회 2009 Structural Engineering and Mechanics, An Int'l Jou Vol.33 No.2
The sealed, tuned liquid column gas damper (TLCGD) with gas-spring effect extends the frequency range of application up to about 5 Hz and efficiently increases the modal structural damping. In this paper the influence of several TLCGDs to reduce coupled translational and rotational vibrations of plan-asymmetric buildings under wind or seismic loads is investigated. The locations of the modal centers of velocity of rigidly assumed floors are crucial to select the design and the optimal position of the liquid absorbers. TLCGD’s dynamics can be derived in detail using the extended non-stationary Bernoulli’s equation for moving reference systems. Modal tuning of the TLCGD renders the optimal parameters by means of a geometrical transformation and in analogy to the classical tuned mass damper (TMD). Subsequently, fine-tuning is conveniently performed in the state space domain. Numerical simulations illustrate a significant reduction of the vibrations of plan-asymmetric buildings by the proposed TLCGDs.
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Chang Chun Chen,Nan Ye,ChuanFu YU,Ting FAN 한양대학교 세라믹연구소 2014 Journal of Ceramic Processing Research Vol.15 No.2
ZnO nanorods were grown on glass substrates coated by an Al-doped ZnO seed layer via a simple solvothermal method using zinc acetate dihydrate (Zn(CH3COO)2 • 2H2O) and Hexamethylenetetramine (C6H12N4) reagent. The structure, morphology and optical properties of these ZnO nanorods dependence on the molar ratio of Zn(CH3COO)2 • 2H2O to C6H12N4 were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Ultraviolet and Visible Spectrophotometry (UV-vis) and photoluminescence (PL) spectrometry, respectively. The XRD patterns indicated that all the ZnO nanorods were well-faceted hexagonal structures and preferentially grown along the c-axis. As the molar ratio of Zn(CH3COO)2 • 2H2O to C6H12N4 decreasing from 2.5 to 0.25, the crystallinity of ZnO nanorods synthesized gradually became inferior and the width of ZnO nanorods also decreased. The blue-shifts of UV emission excited from ZnO nanorods probably arised from the decreased size of ZnO nanorods.
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Phenol removal via activated carbon from co-pyrolysis of waste coal tar pitch and vinasse
Ming Gao,Xiaona Wang,Changlei Xia,Na Song,Yuhui Ma,Qunhui Wang,Tianxue Yang,Shengbo Ge,Chuanfu Wu,Su Shiung Lam 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.1
The behavior and characteristics of phenol adsorption by activated carbon produced from co-pyrolysis of coal tar pitch and vinasse were investigated. Coal tar pitch and vinasse (mass ratio of 1 : 3) were firstly co-pyrolyzed and carbonated at 400 oC for 2 h. The carbonized material produced was then soaked with saturated KOH solution and activated at 800 oC for 1 h to form activated carbon. Results from the phenol wastewater adsorption experiments suggest that pseudo-second-order kinetics and the Weber-Morris model could reflect the time-dependent adsorption behavior of phenol wastewater by the activated carbon, revealing that internal diffusion represents the rate-limiting procedure and dominant process to control the adsorption rate in the early stage of the adsorption. Monolayer adsorption played the key role during the phenol adsorption. The adsorption was an endothermic reaction in temperature ranging from 15 oC to 35 oC, indicating that the adsorption speed could be stimulated by the increasing temperature. This study establishes a theoretical foundation for the usage and the potential application of the activated carbon derived from coal tar pitch and vinasse in wastewater treatment.
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