在深海复杂特殊的环境下,海底软管连接器受多种载荷工况作用,会对海底管道安全运营以及整个水下生产系统的可靠性产生影响,从而对连接器的结构安全性能提出了更高的要求。基于此,以南海某气田软管鹅脖连接器深海安装工程为例,介绍了所...在深海复杂特殊的环境下,海底软管连接器受多种载荷工况作用,会对海底管道安全运营以及整个水下生产系统的可靠性产生影响,从而对连接器的结构安全性能提出了更高的要求。基于此,以南海某气田软管鹅脖连接器深海安装工程为例,介绍了所应用的鹅脖连接器的工作原理和基本参数,分析了鹅脖连接器相较于传统立式连接器的优势。利用实验设计优化技术,针对鹅脖连接器在软管平铺阶段、连接器测漏和静水压测试三种深海工况进行了极限载荷计算研究,并在此基础上开展有限元模拟仿真计算分析和强度校核。结果表明:在不同载荷工况下对鹅脖连接器进行完整载荷工况检查,各工况条件下鹅脖连接器法兰上施加的所有载荷均满足要求;鹅脖连接器在各工况下整体应力均小于许用应力,整体结构综合强度足够,满足安全规范;各工况最大应力均集中在90°弯头处,对其进行强度校核,满足美国机械工程师协会(American Society of Mechanical Engineers,ASME)标准使用要求。本文分析结果可为水下软管连接器的结构优化设计和深海安装提供理论基础和技术参考。展开更多
Combined multi-body dynamics with structural dynamics, a new discrete element with flexible connector, which is applicable for 3-D beam structures, is developed in this paper. Both the generalized elastic coefficient ...Combined multi-body dynamics with structural dynamics, a new discrete element with flexible connector, which is applicable for 3-D beam structures, is developed in this paper. Both the generalized elastic coefficient matrix of the flexible connector and the mass matrix of discrete element may be off-diagonal in a general case. The zero-length rigid element is introduced to simulate the node at which multiple elements are jointed together. It may also be effective when the axes of adjacent elements are not in the same line. The examples for eigenvalue calculation show that the model is successful. It can be extended to the geometric nonlinear response analysis.展开更多
Based on the combination of multi body dynamics and structural dynamics, a new model of discrete element with flexible connector is developed. It is applicable to the eigenfrequency and geometric nonlinear dynamic re...Based on the combination of multi body dynamics and structural dynamics, a new model of discrete element with flexible connector is developed. It is applicable to the eigenfrequency and geometric nonlinear dynamic response analysis of three dimensional beam structures. It is pointed out that both the generalized elastic coefficient matrix of the flexible connector and the mass matrix of discrete element may be off diagonal in a general case. A special discrete element, zero length rigid element, is introduced to simulate the node at which multiple elements are jointed together. It may also be efficient when the axes of adjacent elements are not in the same line. The formulation of stiffness matrix is established while nonlinearity is taken into consideration. Given examples show that the model is successful in eigenvalue calculation and geometric nonlinear response analysis. 展开更多
文摘在深海复杂特殊的环境下,海底软管连接器受多种载荷工况作用,会对海底管道安全运营以及整个水下生产系统的可靠性产生影响,从而对连接器的结构安全性能提出了更高的要求。基于此,以南海某气田软管鹅脖连接器深海安装工程为例,介绍了所应用的鹅脖连接器的工作原理和基本参数,分析了鹅脖连接器相较于传统立式连接器的优势。利用实验设计优化技术,针对鹅脖连接器在软管平铺阶段、连接器测漏和静水压测试三种深海工况进行了极限载荷计算研究,并在此基础上开展有限元模拟仿真计算分析和强度校核。结果表明:在不同载荷工况下对鹅脖连接器进行完整载荷工况检查,各工况条件下鹅脖连接器法兰上施加的所有载荷均满足要求;鹅脖连接器在各工况下整体应力均小于许用应力,整体结构综合强度足够,满足安全规范;各工况最大应力均集中在90°弯头处,对其进行强度校核,满足美国机械工程师协会(American Society of Mechanical Engineers,ASME)标准使用要求。本文分析结果可为水下软管连接器的结构优化设计和深海安装提供理论基础和技术参考。
基金The project was financially supported by the National Natural Science Foundation of China
文摘Combined multi-body dynamics with structural dynamics, a new discrete element with flexible connector, which is applicable for 3-D beam structures, is developed in this paper. Both the generalized elastic coefficient matrix of the flexible connector and the mass matrix of discrete element may be off-diagonal in a general case. The zero-length rigid element is introduced to simulate the node at which multiple elements are jointed together. It may also be effective when the axes of adjacent elements are not in the same line. The examples for eigenvalue calculation show that the model is successful. It can be extended to the geometric nonlinear response analysis.
文摘Based on the combination of multi body dynamics and structural dynamics, a new model of discrete element with flexible connector is developed. It is applicable to the eigenfrequency and geometric nonlinear dynamic response analysis of three dimensional beam structures. It is pointed out that both the generalized elastic coefficient matrix of the flexible connector and the mass matrix of discrete element may be off diagonal in a general case. A special discrete element, zero length rigid element, is introduced to simulate the node at which multiple elements are jointed together. It may also be efficient when the axes of adjacent elements are not in the same line. The formulation of stiffness matrix is established while nonlinearity is taken into consideration. Given examples show that the model is successful in eigenvalue calculation and geometric nonlinear response analysis.
