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Analytical study of the failure mode and pullout capacity of suction anchors in sand
Liu, Haixiao,Peng, Jinsong,Zhao, Yanbing Techno-Press 2015 Ocean systems engineering Vol.5 No.4
Suction anchors are widely adopted and play an important role in mooring systems. However, how to reliably predict the failure mode and ultimate pullout capacity of the anchor in sand, especially by an easy-to-use theoretical method, is still a great challenge. Existing methods for predicting the inclined pullout capacity of suction anchors in sand are mainly based on experiments or finite element analysis. In the present work, based on a rational mechanical model for suction anchors and the failure mechanism of the anchor in the seabed, an analytical model is developed which can predict the failure mode and ultimate pullout capacity of suction anchors in sand under inclined loading. Detailed parametric analysis is performed to explore the effects of different parameters on the failure mode and ultimate pullout capacity of the anchor. To examine the present model, the results from experiments and finite element analysis are employed to compare with the theoretical predictions, and a general agreement is obtained. An analytical method that can evaluate the optimal position of the attachment point is also proposed in the present study. The present work demonstrates that the failure mode and pullout capacity of suction anchors in sand can be easily and reasonably predicted by the theoretical model, which might be a useful supplement to the experimental and numerical methods in analyzing the behavior of suction anchors.
Analytical study of the failure mode and pullout capacity of suction anchors in clay
Liu, Haixiao,Wang, Chen,Zhao, Yanbing Techno-Press 2013 Ocean systems engineering Vol.3 No.2
Suction anchors are widely adopted in mooring systems. However there are still challenges in predicting the failure mode and ultimate pullout capacity of the anchor. Previously published methods for predicting the inclined pullout capacity of suction anchors are mainly based on experimental data or the FEM analysis. In the present work, an analytical method that is capable of predicting the failure mode and ultimate pullout capacity of the suction anchor in clay under inclined loading is developed. This method is based on a rational mechanical model for suction anchors and the knowledge of the mechanism that the anchor fails in seabed soils. In order to examine the analytical model, the failure angle and pullout capacity of suction anchors from FEM simulation, numerical solution and laboratory tests in uniform and linear cohesive soils are employed to compare with the theoretical predictions and the agreement is satisfactory. An analytical method that can evaluate the optimal position of the attachment point is also proposed in the present study. The present work proves that the failure mode and pullout capacity of suction anchors can be reasonably determined by the developed analytical method.
An Analysis of Religious Extremism on the Belt and Road Initiative
Song Haixiao,Zhang Chengcen 아시아사회과학학회 2020 Jornal of Asia Social Science Vol.1 No.1
China is one of the countries with the largest number of neighbors in the world, and naturally it is easy to form a complex international environment. Under the background of the belt and road initiative strategy, religious extremism has been involved and developed in various countries and regions along the belt and road initiative, among which Islamic extremism in Central Asia and West Asia is the most prominent, showing the characteristics of politics, confusion and terror, which leads to the complex international environment and uncertain influencing factors in the construction of the belt and road initiative. It further aggravates the difficulty of maintaining China s national stability and people s lives and property safety, and seriously affects China s overseas investment and interest’s maintenance. It is necessary to strengthen cooperation with countries along the belt and road initiative in related fields.
Non-isolated H10 three-phase inverter for leakage current suppression
Ma, Haixiao,Lan, Zhaixing,Chen, Zefeng The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.5
In recent years, an increasing amount of attention has been paid to non-isolated photovoltaic power generation systems, where leakage current suppression is one of the key issues to be addressed. In view of this problem, this paper proposes a novel ten-switch three-phase circuit that is referred to as an H10 inverter. This circuit is obtained by adding two isolating switches and a clamping circuit to the traditional three-phase inverter (H6 inverter). The working principle of the proposed system is analyzed. On the basis of the logic relationship between the common-mode voltage (CMV) and the switching states, a control strategy combining carrier modulation and logic operation is proposed. With this proposed control strategy, the H10 inverter can effectively reduce the variation of the CMV and improve the leakage current suppression. Finally, simulation and experimental platforms are built for the inverter system, and the obtained results are compared with those of a traditional three-phase inverter to verify the correctness of the theoretical analysis.