Based on the review of present force coefficients estimation methods, a new method in the frequency domain, revised cross-spectrum estimation method, is presented in this paper. Some experiments on the wave-current fo...Based on the review of present force coefficients estimation methods, a new method in the frequency domain, revised cross-spectrum estimation method, is presented in this paper. Some experiments on the wave-current force on inclined cylinders are also described and the wave current force coefficients are estimated by the revised cross-spectrum estimation method. From the results, it is found that the wave and current directions have some regular effect on the coefficients. According to the results, some empirical formulas are obtained for converting the wave-current force coefficients on inclined cylinders into a unified coefficient. Comparisons show that the unified coefficients are in good agreement with other results.展开更多
On the basis of the two structures of the bridge foundation designed for the East Sea Bridge, the wave current forces on four types of oblique piles, the pile group and the single piles at different positions in the p...On the basis of the two structures of the bridge foundation designed for the East Sea Bridge, the wave current forces on four types of oblique piles, the pile group and the single piles at different positions in the pile group considering the effect of the super structures were experimentally investigated. The relationship between the wave current forces and the associated wave parameters, and the comparison of the wave current forces on the pile groups and the single piles were systematically analyzed. The group effectiveness and the reduction coefficient for the wave current forces on the group were examined for engineering design.展开更多
Based on model test,the statistical distribution of extreme values of wave- current in-line forces acting on vertical circular cylinder is analyzed in this paper.It is shown that the results calculated by the simplifi...Based on model test,the statistical distribution of extreme values of wave- current in-line forces acting on vertical circular cylinder is analyzed in this paper.It is shown that the results calculated by the simplified method,proposed by authors,agree well with the test data;Weibull distribution is also adoptable in the region of high KC number, and the shape parameter a and scale parameter β are related well with KC number respectively.展开更多
This paper analyzes the eddy currents and the electro-magnetic forces on the lower hybrid wave (LHW) launching antenna on the superconducting Tohamak HT-7 by using a finite element circult method. A new iterative algo...This paper analyzes the eddy currents and the electro-magnetic forces on the lower hybrid wave (LHW) launching antenna on the superconducting Tohamak HT-7 by using a finite element circult method. A new iterative algorithm is developed to analyze the coupled magnetic fields Which are very difficult to be calculated. The method and results obtained are helpful to study the eddy currents and electro-magnetic forces on metal plates which are placed in a rather complicated electro-magnetic environment.展开更多
In this paper, the two-way coupling of flow and steel pipe pile platform is simulated by ANSYS Workbench. Taking the construction platform in the deep water area of the Yangtze River Estuary as an example, the stress ...In this paper, the two-way coupling of flow and steel pipe pile platform is simulated by ANSYS Workbench. Taking the construction platform in the deep water area of the Yangtze River Estuary as an example, the stress and deformation characteristics of the steel pipe pile platform under current force are analyzed in detail. As a result, it is suggested the platform piles should be arranged regularly and the connected node de-sign of the platform structure should be strengthened to ensure the safety.展开更多
文摘Based on the review of present force coefficients estimation methods, a new method in the frequency domain, revised cross-spectrum estimation method, is presented in this paper. Some experiments on the wave-current force on inclined cylinders are also described and the wave current force coefficients are estimated by the revised cross-spectrum estimation method. From the results, it is found that the wave and current directions have some regular effect on the coefficients. According to the results, some empirical formulas are obtained for converting the wave-current force coefficients on inclined cylinders into a unified coefficient. Comparisons show that the unified coefficients are in good agreement with other results.
基金the Program for Changjiang Scholars and Innovative Research Team in Universities (Grant No. IRT0420)the Program for New Century Excellent Talents in Universities (Grant No. NCET-05-0282).
文摘On the basis of the two structures of the bridge foundation designed for the East Sea Bridge, the wave current forces on four types of oblique piles, the pile group and the single piles at different positions in the pile group considering the effect of the super structures were experimentally investigated. The relationship between the wave current forces and the associated wave parameters, and the comparison of the wave current forces on the pile groups and the single piles were systematically analyzed. The group effectiveness and the reduction coefficient for the wave current forces on the group were examined for engineering design.
文摘Based on model test,the statistical distribution of extreme values of wave- current in-line forces acting on vertical circular cylinder is analyzed in this paper.It is shown that the results calculated by the simplified method,proposed by authors,agree well with the test data;Weibull distribution is also adoptable in the region of high KC number, and the shape parameter a and scale parameter β are related well with KC number respectively.
文摘This paper analyzes the eddy currents and the electro-magnetic forces on the lower hybrid wave (LHW) launching antenna on the superconducting Tohamak HT-7 by using a finite element circult method. A new iterative algorithm is developed to analyze the coupled magnetic fields Which are very difficult to be calculated. The method and results obtained are helpful to study the eddy currents and electro-magnetic forces on metal plates which are placed in a rather complicated electro-magnetic environment.
文摘In this paper, the two-way coupling of flow and steel pipe pile platform is simulated by ANSYS Workbench. Taking the construction platform in the deep water area of the Yangtze River Estuary as an example, the stress and deformation characteristics of the steel pipe pile platform under current force are analyzed in detail. As a result, it is suggested the platform piles should be arranged regularly and the connected node de-sign of the platform structure should be strengthened to ensure the safety.
