海洋石油钻井平台设备安全管理探讨

首先阐述了设备安全管理定义,指出其对海洋石油钻井平台具有重要意义。随后从设备选型、日常维护、故障处理等三个方面并结合工作中的实例,对如何做好钻井平台的设备安全管理工作进行了探讨,表明了一些必须坚持的原则,提出了一些注意事项,对从事本行业设备管理人员开展工作有较好的指导意     

双燃料型近海供应船开发设计研究

以一艘LNG燃料近海供应船船型的研究开发项目为例,对船舶的总布置方式、动力系统选型、LNG燃料系统架构、危险气体影响区域、变频驱动技术等关键技术进行详细分析,对于船舶的污染物排放和船舶能效指数做了初步计算分析,可以为LNG动力船舶的船型开发提供有益参考。     

水深对半潜式平台水动力性能及波浪载荷的影响*

本文根据有条件的建模方法（CMA）和一次逆可靠度方法(IFORM),运用Matlab编程计算确定百年一遇波高-周期的等概率曲线,设计了一组百年一遇波浪海况。根据Morison方程与绕射理论计算海洋平台波浪载荷的各自特点,本文采用Morison方程和绕射理论相结合的方法,运用挪威船级社研发的SESAM程序,就水深对半潜式海洋平台水动力性能和波浪载荷的影响进行了分析。某半潜式海洋平台计算分析水深对平台的运动响应、气隙、波浪二阶平均漂移力和纵向剪切力等六个波浪载荷的影响。     

浅析地铁车站设计

地铁车站设计是一个综合性很强的工作,要与线路、行车、信号、通风空调等专业紧密相关,各个专业之间的优化组合对于降低地铁车站造价有着非常重要的作用。详细介绍了地铁车站的平面布局设计,合理的车站布局设计,可以有效减少地铁的工程建设费用。     

Accelerated second-order hydrodynamic load calculation on semi-submersible floaters

A rapid method for calculation of second-order hydrodynamic wave loads on semi-submersible platforms is developed and validated against radiation–diffraction theory. The method is based on slender-body theory and builds on modal truncation of the quadratic transfer function (QTF). The semi-submersible floater is split into individual members and the existing theory for vertical cylindrical columns is extended to include the heave force. Further expressions for the surge, heave and pitch load on the horizontal pontoons are derived and implemented. The accuracy of the method is assessed by comparison to radiation–diffraction results using the Pinkster approximation. We find that the slender-body approximation for the column surge force is most accurate for small values of the diameter-to-draft ratio. For the three sea states considered, this error is below 10% for diameter-to-draft ratios less than 0.2.Error analysis is provided for the column heave and pitch and the pontoon loads. For all members, application of 128 modes in the QTF approximation is found sufficient to accurately represent the full slender-body QTF solution.Next, the first- and second-order loads on the full floater under different sea state conditions are compared to radiation–diffraction theory. With 128 modes, the second-order loads are obtained 2500 times faster than with conventional approaches with error levels of 22% for surge, 10% for pitch and zero error for heave. The surge error is discussed and linked to the small draft of the columns. The numerical efficiency of the method allows the consideration of second-order loads in the first stages of the design and optimisation of semi-submersible floaters.     

Evaluation of RAOs of a semi-submersible platform using field measurements: A full-scale model in Caspian sea environmental conditions

The present research investigates the motion response of a semi-submersible platform using measured field data. The Iran-Amirkabir semi-submersible platform (SSP) was considered as full-scale model in operation conditions. First, 14 accelerometer sensors were installed on the platform's hull, and measurements were made in 5 different scenarios in the Caspian Sea environmental conditions. Then, the Response Amplitude Operators (RAOs) for six degrees of motion were extracted using measured accelerator data. The Surge, Sway, and Heave RAOs processed by the Kalman estimation filter, Pitch, Roll, and Yaw RAOs were calculated from the Sensor Array method. Moreover, the boundary element method in ANSYS/AQWA software for the Iran-Amirkabir semi-submersible model was developed, and the RAO results were validated against the extracted field measurements. The obtained results from the Sensor Array method and the Kalman estimation filter are compared with the numerical simulations, which show Root Mean Square Errors of less than 3% and 4%, respectively for rotational and translational movements. The Mean Square Errors between both methods were also close to zero. Therefore, the proposed methods predicted activities of the studied SSP with relatively good accuracy by field data collected in the Caspian Sea.