Generalized projective synchronization of two coupled complex networks of different sizes

We investigate a new generalized projective synchronization between two complex dynamical networks of different sizes. To the best of our knowledge, most of the current studies on projective synchronization have dealt with coupled networks of the same size. By generalized projective synchronization, we mean that the states of the nodes in each network can realize complete synchronization, and the states of a pair of nodes from both networks can achieve projective synchronization. Using the stability theory of the dynamical system, several sufficient conditions for guaranteeing the existence of the generalized projective synchronization under feedback control and adaptive control are obtained. As an example, we use Chua's circuits to demonstrate the effectiveness of our proposed approach.     

深海多工况载荷作用下软管连接器结构强度分析

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。