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      • KCI등재

        Selection of New Type Radial Steel Gate and Analysis of Static and Dynamic Characteristics

        Zhonghao Zhang,Lan Jiaxin,Fan Feng,Zhi Xudong 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.5

        Radial gate, mainly composed of gate leaf, arm and hinge, is a widely used gate types in hydraulic structures. This study proposed an improved model structure of radial gate, On the basis of the traditional radial gate, a pressure rod is added to connect the support arm and the bifurcation point of the lower fl ange of the longitudinal beam. The improved model structure of radial gate is designed, simulated and analyzed by using the general fi nite element software ANSYS. The results illustrate that the stress value and displacement value of each component of radial rigid gate with compression bar arrangement are greatly reduced compared with traditional gate, among which the arm stress reduction and the longitudinal radial displacement reduction are up to 28.14%, and 27.35%, respectively. In addition, the overall ultimate bearing capacity increased by 26.80% with only a few increase of steel consumption; When the gate is closed without water, the natural frequency and amplitude response frequency of the improved gate are higher than that of the traditional gate, furthermore the response amplitude of each key node is reduced. Hence, this new design provides a high potential for the overall stability and the anti-vibration performance of traditional radial gate.

      • KCI등재

        Simlating the Stability and Pre-stressed Tension of a Single-Layer Spherical Reticulated Shell Supported by Cable

        Zhang Zhonghao,Zhi Xudong,Li Qixun,Fan Feng 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.2

        Along with other developments that have occurred in this era, building requirements include not only function and practicality but also encompass architectural elegance such as lighting and light-weight structures. Conventional latticed shell triangulation creates a poor architectural eff ect as well as mediocre lighting and excessive and cluttered componentry. A latticed shell with quadrilateral meshing is light and has excellent lighting properties, but it also has low rigidity and inferior stability. This study addresses this problem by deploying in-plane stayed cables and horizontal and vertical cables out-of-plane via a strut, and by developing a new single-layer spherical latticed shell system supported by cables. The eff ects that various parameters have on the mechanical properties of this structures such as the rise-span ratio, asymmetric load distribution, strut length, initial defects and cable pre-stress, are investigated based on mechanical responses such as structural displacement, internal force, critical bearing capacity and the instability modal. The basic rules of structural stress are summarised and examples of 100 m and 150 m large span latticed shell structures are used to verify and analyse the rules for the mechanical properties of this structure, and to investigate how applicable this type of architecture is in a large-span structure. Based on the sequence used to tension the cable(s) during construction, several plans for pre-stressing in-plane and out-of-plane cable(s) are also proposed. The eff ect that this pre-stressing sequence has on structural properties such as maximum displacement and critical bearing capacity is investigated at each stage of construction via a numerical simulation of the structure. A proper procedure for constructing this structure is also proposed to provide theoretical support for an actual project.

      • Rationally designed hybrids of NiCo<sub>2</sub>O<sub>4</sub> and polymeric carbon nitride as faradaic electrodes with enhanced electrochemical performance

        Wang, Zhonghao,Hu, Xun,Wang, Lina,Jin, Bingjun,Zou, Guojun,Huang, Zhiwei,Liu, Qing,Hu, Guangzhi,Zhang, Kan,Park, Jong Hyeok Elsevier 2019 ELECTROCHIMICA ACTA Vol.299 No.-

        <P><B>Abstract</B></P> <P>Herein, electrochemically sluggish polymeric carbon nitride (PCN) is successfully introduced into NiCo<SUB>2</SUB>O<SUB>4</SUB> to form hybrids of NiCo<SUB>2</SUB>O<SUB>4</SUB> and PCN, in which PCN nanosheets are regarded as a substrate to promote the nucleation and subsequent in-situ growth of NiCo<SUB>2</SUB>O<SUB>4</SUB> nanosheets. The surface of as-prepared hybrids are rich in Ni and Co ions in low and high valence state, respectively. In addition, the hybrids exhibit more hydrophilic compared with that of pristine NiCo<SUB>2</SUB>O<SUB>4</SUB> due to its higher amounts of hydroxyl group. It has been found that the nitrogen species originated from PCN nanosheets tend to bond with the metal ions and electrolyte used, resulting in tuning the electronic structural states and coupling effects with NiCo<SUB>2</SUB>O<SUB>4</SUB> nanosheets. Owing to these structural characteristics, the electrochemical performance as faradaic electrode materials and long-term stability of optimized hybrid is much superior to the bare NiCo<SUB>2</SUB>O<SUB>4</SUB> nanosheets.</P> <P><B>Highlights</B></P> <P> <UL> <LI> NiCo<SUB>2</SUB>O<SUB>4</SUB>-PCN samples were prepared via a facile and scalable strategy. </LI> <LI> The NiCo<SUB>2</SUB>O<SUB>4</SUB>-PCN-40 exhibited much higher supercapacitor performance than that of pure NiCo<SUB>2</SUB>O<SUB>4</SUB>. </LI> <LI> The PCN nanosheets can promote the nucleation and subsequent in-situ growth of NiCo<SUB>2</SUB>O<SUB>4</SUB> nanosheets in oriented way. </LI> <LI> The presence of PCN can tune the electronic structural states and coupling effects with NiCo<SUB>2</SUB>O<SUB>4</SUB> nanosheets. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>The vertically growth of NiCo<SUB>2</SUB>O<SUB>4</SUB> on PCN nanosheets substrate with 3D open frameworks synthesized here is beneficial for facilitating electrolyte ions transport and electron trapping, thus boosting the supercapacitor performance of NiCo<SUB>2</SUB>O<SUB>4</SUB>.</P> <P>[DISPLAY OMISSION]</P>

      • KCI등재

        Si3N4 ceramic ball surface quality prediction modeling and its influence mechanism analysis

        Jian Sun,Zhonghao Tian,Junran Huang,Jinmei Yao,Lu Wang,Yang Zhang 한양대학교 청정에너지연구소 2024 Journal of Ceramic Processing Research Vol.25 No.3

        To establish a prediction model for the surface quality of silicon nitride ceramic balls under the conical grinding method,and to analyze the influence mechanism of different working conditions on the surface quality under this grinding method. A simulation prediction model of the grinding quality of the surface of silicon nitride ceramic balls was established basedon MATLAB, through which the three-dimensional morphology and roughness of the surface of silicon nitride ceramicballs were simulated and analyzed. With the increase in abrasive particle size, the abrasive concentration decreases, thesurface roughness of the processed silicon nitride ceramic ball increases accordingly, the number of scratches producedby the abrasive particles on the surface of the ceramic ball after scratching and rolling and its peak/valley difference risesaccordingly, and the proportion of surface defects such as bumps, craters, and directional scratches per unit area of the grindsurface layer increases, and the surface quality decreases significantly. This paper plays an important role in the predictionof surface quality of silicon nitride ceramic ball grinding and the formulation of process methods.

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