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The mechanical performance of a flexible riser is more outstanding than other risers in violent environmental conditions. Based on the lumped mass method, a steep wave flexible riser configuration attached to a Floating Production Storage and Offloading (FPSO) has been applied to a global analysis in order to acquire the static and dynamic behavior of the flexible riser. The riser was divided into a series of straight massless line segments with a node at each end. Only the axial and torsional properties of the line were modeled, while the mass, weight, and buoyancy were all lumped to the nodes. Four different buoyancy module lengths have been made to demonstrate the importance of mode selection, so as to confirm the optimum buoyancy module length. The results in the sensitivity study show that the flexible riser is not very sensitive to the ocean current, and the buoyancy module can reduce the Von Mises stress and improve the mechanical performance of the flexible riser. Shorter buoyancy module length can reduce the riser effective tension in a specific range of the buoyancy module length when other parameters are constant, but it can also increase the maximum curvature of the riser. As a result, all kinds of the riser performances should be taken into account in order to select the most appropriate buoyancy module length. 相似文献
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Problems experienced during Floating Production, Storage and Offloading (FPSO) tandem offloading operations were investigated.
The aim of this research was to improve the reliability of such systems, and it needed a means to assess them. Time-domain
simulation and analysis of offloading systems was performed using the multi-body mooring software ARIANE 7.0. Hydrodynamic
interaction between the vessels was considered. The responses of the offloading system in different loading cases, different
parameters of offloading hawsers and the effects of challenging environmental conditions were calculated. There was a focus
on the problems of relative motion between the two bodies and its effects on the intensity of hawser forces. Minimum relative
distance, maximum relative headings and maximum tension in the hawsers of offloading systems were obtained by time-domain
analysis. The time-domain analysis was effective and comparative study can be used to optimize parameters of the system and
extend operating limits. 相似文献
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对某机车牵引电机冷却风道入口分别采用连接轴流式通风机和以导流筒环形截面作为空气入口两种方法对风道进行模拟计算,通过对计算结果的对比分析,得出导流筒上方的轴流式通风机结构对风道计算结果的影响并不大,因此在冷却风道模拟计算中可以去掉复杂的通风机结构,采用以导流筒环形截面作为空气入口的物理模型建立方法,从而减轻建模工作量,提高计算效率. 相似文献
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FPSO关键系统风险分析(英文) 总被引:2,自引:0,他引:2
Risk analysis of key systems have become a growing topic late of because of the development of offshore structures. Equipment failures of offloading system and fire accidents were analyzed based on the floating production, storage and offloading (FPSO) features. Fault tree analysis (FTA), and failure modes and effects analysis (FMEA) methods were examined based on information already researched on modules of relex reliability studio (RRS). Equipment failures were also analyzed qualitatively by establishing a fault tree and Boolean structure function based on the shortage of failure cases, statistical data, and risk control measures examined. Failure modes of fire accident were classified according to the different areas of fire occurrences during the FMEA process, using risk priority number (RPN) methods to evaluate their severity rank. The qualitative analysis of FTA gave the basic insight of forming the failure modes of FPSO offloading, and the fire FMEA gave the priorities and suggested processes. The research has practical importance for the security analysis problems of FPSO. 相似文献
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计算校核了某TLP平台垂向肘板在极端环境条件下的应力响应.该垂向肘板为TLP立柱与张力支撑系统(TSS)间的连接件,是TLP平台强度评估的关键部位.根据通用的业界标准,平台的环境载荷计算采用三维线性理论,结构分析使用有限元方法.应力数值计算与处理与实测应变片的位置和方向完全一致.平台在位监测的数据使用FFT技术进行了处理,得到了不同时段统计下各浪向的应力谱密度(RAO).数值计算与平台在位实测对比表明,数值模拟的应力谱密度与实测数据吻合较好,业界的分析方法可以在极端条件下对TLP的关键部位进行有效的强度分析. 相似文献
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为了能够在S型铺管过程中将管线、船体和托管架三者作为一个整体进行耦合分析,使用势流理论用于计算船体受到的波浪力,广义弹性接触面法模拟托辊与管线之间的接触,采用带有铰接刚度的铰连接来模拟管线的上弯段,集中质量法用于模拟管线的中垂段和下弯段。通过时域全耦合方程将整个系统联立求解,并将这种方法的结果和未考虑上弯段管线接触的结果与实验值进行了对比发现:新计算方法能够使管线受力和船体运动都更为接近于实际值。对管线张力进行了谱密度分析,得到了对管线张力作用较大的频谱范围,为其在不同海况下的适应性提供了技术参数。 相似文献