不同敏感性参数下船舶-碎冰碰撞的船体结构响应

基于我国第七次北极科学考察获得的夏季北极海冰空间分布情况,模拟真实碎冰分布,采用LS-DYNA软件中的流固耦合方法,研究在船舶航速、碎冰尺度、碎冰厚度及碎冰密集度等因素影响下船舶-碎冰碰撞的船体结构响应。结合试验数据得到船体结构的应力、吸能和碰撞力。结果表明：船舶-碎冰的主要碰撞区域为艏部及舷侧的水线附近;在船舶航行于碎冰域时,船体结构的应力、吸能和碰撞力的峰值随碎冰域的船舶航速、碎冰尺度、碎冰厚度及碎冰密集度的增加而增加,但分布情况不同。研究结果为船舶在极地冰区航行提供一定的安全性参考。     

深海系泊缆的动刚度特性

针对纤维缆在交变载荷作用下存在的动刚度问题,基于集中质量法的思想建立了系缆的动张力计算模型,编制了能够有效分析系泊系统动力响应的源程序.将张力程序计算结果与商业软件计算结果进行对比,验证了算法程序的准确性,并在此基础上分析了纤维缆复杂的应力应变行为,采用统计的原理计算平均张力和张力幅值,将动刚度引入模型中探究其对系泊张力的影响.此外,分析系统在不同运动形式及环境载荷下的张力结果,研究考虑动刚度后系统参数对系泊张力的影响规律.     

转向架撒砂装置随机振动疲劳分析与状态监测研究

转向架撒砂装置在服役过程中承受来自轮轨的随机振动激扰,其与轴箱体螺纹连接的部位可能出现松脱甚至断裂。文章一方面通过结合模态计算与模态试验对标研究,校验有限元模型,获得模态参数,并综合随机响应分析和疲劳应力评估的Dirlik模型,研究基于模态分析的随机振动疲劳分析方法;另一方面,为增加撒砂装置服役安全,研究了一种基于光纤光栅的状态监测技术,并在台架试验上进行了验证,在设计上保障了撒砂装置的服役安全。     

Dynamic operations and pricing of electric unmanned aerial vehicle systems and power networks

The emergence of electric unmanned aerial vehicle (E-UAV) technologies, albeit somewhat futuristic, is anticipated to pose similar challenges to the system operation as those of electric vehicles (EVs). Notably, the charging of EVs en-route at charging stations has been recognized as a significant type of flexible load for power systems, which often imposes non-negligible impacts on the power system operator’s decisions on electricity prices. Meanwhile, the charging cost based on charging time and price is part of the trip cost for the users, which can affect the spatio-temporal assignment of E-UAV traffic to charging stations. This paper aims at investigating joint operations of coupled power and electric aviation transportation systems that are associated with en-route charging of E-UAVs in a centrally controlled and yet dynamic setting, i.e., with time-varying travel demand and power system base load. Dynamic E-UAV charging assignment is used as a tool to smooth the power system load. A joint pricing scheme is proposed and a cost minimization problem is formulated to achieve system optimality for such coupled systems. Numerical experiments are performed to test the proposed pricing scheme and demonstrate the benefits of the framework for joint operations.     

大型穿浪内倾船型耐波性能研究

针对大型穿浪内倾船型的波浪中航行性能，采用基于势流理论的切片方法，分析六级海况下的船体纵摇、升沉运动的时历曲线，获取不同船长、波长比下的运动响应函数，通过对比计算和试验数据，发现针对该船型，计算方法能够满足工程开发精度要求。     

某型燃气轮机低压压气机转子模态及动力学分析

采用CAD/CAE综合分析方法,基于实体模型,应用网格划分软件Hypermesh,建立某型燃气轮机低压压气机转子的有限元模型.利用数值仿真软件求解转子的固有频率和弯曲振型、临界转速以及稳态不平衡响应.计算结果表明转子具有良好的整体结构刚度,一阶临界转速安全系数合理.动力学分析结果表明,在压气机的设计及制造工艺中需要对转子第4级的平衡工作以及此处附近转鼓的结构强度给予一定重视.     

Development of interlink wear estimation method for mooring chain of floating structures: Validation and new approach using three-dimensional contact response

Long-term operation of mooring systems is one of the challenging issues of floating structures such as floating offshore wind turbines (FOWTs). For integrity assessment, fatigue and its affecting factors have generated considerable recent research interest as the occurrence of a large number of mooring chain failures at a high rate has been reported. By contrast, only few studies on the effect of nonuniform volume loss of mooring chain links due to wear can be found because of difficulties to estimate wear amounts quantitatively. Considering this issue, in this paper, validation of the quantitative interlink wear estimation method is investigated by applying to a spar-type floating structure. Firstly, the method is presented which consists of the material test, derivation of an interlink wear estimation formula with FE analysis, and calculation of mooring chain response with coupled dynamic analysis using a mass-spring model. To improve insufficient accuracy due to the mass-spring model around a clump weight and the touchdown point, the method is further modified by using a 3-D rigid-body link model. The estimation results and comparison show that the modified method distinguishing between rolling and sliding can calculate the interlink wear amount closer to the chain diameter measurements and more reasonable than the method using the conventional mass-spring model.     

船载有毒有害物质(HNS)应急反应对策研究

文中通过分析江苏船载HNS运输风险现状,剖析了江苏船载HNS应急反应存在的问题,提出加强应急技术研究、完善应急预案、健全三级应急反应系统,以期提高HNS污染事故防控水平及处置能力。     

VLCC翼桥振动分析及相关技术研究

分析了超大型油船（VLCC）翼桥产生振动的原因,运用有限元（FEM）静力学分析、模态分析和频域响应分析理论进行实船撞击和试航振动测量,通过理论与实际相结合,提出了综合解决船舶振动问题的方案。     

篱笆式卷筒结构的动态特性研究

为了提高篱笆式卷筒结构设计的安全性和可靠性,分析了多层钢丝绳缠绕作用下卷筒体承受径向外压力、横向力和棘爪力的受力情况,利用有限元技术计算了卷筒在筒体、端板作用力下的屈曲特征,将卷筒体视为变质量系统得到了不同缠绕情况下的结构模态,最后分析了不同工作压力载荷状态下整体结构的频率响应特性。研究工作为卷筒体结构的优化设计提供了分析手段和参考依据。