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Numerical and experimental study on the impact between a free falling wedge and water
Chuanrui Dong,Shili Sun,Hexing Song,Qiang Wang 대한조선학회 2019 International Journal of Naval Architecture and Oc Vol.11 No.1
In this paper, numerical and experimental studies are performed to investigate the liquid impact on a free falling wedge. In the numerical simulation, the structure is assumed to be rigid and the elastic response is ignored. The fully nonlinear coupling between wedge and water is considered by an auxiliary function method based on the Boundary Element Method (BEM). At the intersection of the wedge surface and liquid surface, two coincident nodes are used to decouple the boundary conditions. The Eulerian free surface conditions in the local coordinate system are adopted to update the deformed free surface. In the experiments, five pressure sensors are fixed on each side of the wedge which is released from an experimental installation. Steel and aluminum wedges that have different structural elasticity are used in the experiments to investigate the influence of structural elasticity on the impact force. Numerical results are compared with experimental data and they agree very well. The influence of fluid gravity, body mass, initial entry speed and deadrise angle on the impact pressure are further investigated.
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Chuanrui Wang,Chuanxu Yan,Zhenchong Liu 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.1
The leader-following consensus problem for a class of second-order nonlinear multi-agent systems underMarkovian switching topologies is studied. First, a discontinuous distributed adaptive nonlinear control law usingthe relative state information between neighboring agents is designed for heterogeneous multi-agent systems, whichachieves almost sure leader-following consensus for the closed-loop system. Then, a smooth distributed control lawis designed for homogeneous multi-agent systems. Compared with previous results, the nonlinear functions are notrequired to satisfy the globally Lipschitz condition and the adaptive consensus protocol is in a distributed fashion,i.e., using only the relative information. A practical example of ship course control system and simulation areprovided to demonstrate the effectiveness of the control scheme
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Chuanrui Guo,Genda Chen 국제구조공학회 2021 Smart Structures and Systems, An International Jou Vol.28 No.4
In this study, a corrosion threshold-controllable sensing system of long period fiber gratings (LPFG) is developed and validated for life-cycle monitoring of steel bars in corrosive environments. Three Fe-C coated LPFG sensors with two bare LPFG sensors in LP<sub>06</sub> and LP<sub>07</sub> modes for strain and temperature compensation were multiplexed and deployed inside three miniature, coaxial steel tubes to measure three (long-term in years) critical mass losses through the penetration of tube walls and their corresponding (short-term in hours) corrosion rates in the life span of steel bars. The strain/temperature and mass loss measurements are based on the changes in grating period and refractive index of surrounding medium, respectively. Thermal/mechanical loading and accelerated corrosion tests were conducted to validate the functionality, sensitivity, accuracy, and robustness of the proposed sensing system. Since both the steel tube and Fe-C layer represent the material composition of steel bars in the context of corrosion, the mass loss correlation among any two of the steel tube, Fe-C layer and steel bar is independent of the test conditions such as the current density and sample length, and thus applicable to engineering practices. The outer tube can notably delay and decelerate the corrosion process of its inner steel tube due to the reduced current effect.
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Numerical and experimental study on the impact between a free falling wedge and water
Dong, Chuanrui,Sun, Shili,Song, Hexing,Wang, Qiang The Society of Naval Architects of Korea 2019 International Journal of Naval Architecture and Oc Vol.11 No.1
In this paper, numerical and experimental studies are performed to investigate the liquid impact on a free falling wedge. In the numerical simulation, the structure is assumed to be rigid and the elastic response is ignored. The fully nonlinear coupling between wedge and water is considered by an auxiliary function method based on the Boundary Element Method (BEM). At the intersection of the wedge surface and liquid surface, two coincident nodes are used to decouple the boundary conditions. The Eulerian free surface conditions in the local coordinate system are adopted to update the deformed free surface. In the experiments, five pressure sensors are fixed on each side of the wedge which is released from an experimental installation. Steel and aluminum wedges that have different structural elasticity are used in the experiments to investigate the influence of structural elasticity on the impact force. Numerical results are compared with experimental data and they agree very well. The influence of fluid gravity, body mass, initial entry speed and deadrise angle on the impact pressure are further investigated.
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Zhe Cao,Qiyu Huang,Chuanrui Zhao,Qing Zhang 대한금속·재료학회 2016 ELECTRONIC MATERIALS LETTERS Vol.12 No.6
Metal-assisted chemical etching (MACE) has been used as a promising alternativemethod to fabricate micro/nano-structures on silicon substrates inexpensively. In thispaper, profiles of deep trenches on silicon substrates, with different doping levels,fabricated by MACE were studied. A layer of interconnected gold islands was firstdeposited onto the silicon substrate as catalyst. Electrochemical etching was thenperformed in a hydrofluoric acid (HF) and hydrogen peroxide (H2O2) mixturesolution with different HF-to-H2O2 ratio ρ (ρ = [HF]/([HF] + [H2O2])). Vertical deeptrenches were fabricated successfully by using this method. It was observed thateven under identical experimental condition, sidewalls with various tilting anglesand different morphology could still form on silicon substrates with differentresistivity. This possibly because with different resistivity silicon substrate, thegradient of holes in it greatly changed, and so did the final morphology. As a result,the tilting angle of etched trench sidewall can be tuned from 6 ° to 96 ° using siliconsubstrates with different resistivity and etchants with different ρ. By applying theangle-tuning technique revealed in this study, high aspect ratio patterns with verticalsidewalls could be fabricated and three-dimensional complex structures could bedesigned and realized in the future.
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