深水导管架扶正计算方法研究

在海洋工程导管架安装设计中,扶正分析涉及众多的设计过程,而且关系到后续的坐底稳性及强度设计,如何遵循规范安全的将导管架扶正并最大可能的降低安装费用,找到最佳的扶正方案是设计人员所关注的,结合实例运用SACS与MOSES程序对导管架进行扶正分析来阐述这一问题.     

一幢办公楼结构抗灾能力分析

采用PKPM软件,分析50年一遇风载及强烈地震情况下,某办公楼的实际抗风和抗震性能;采用MSP软件分析该建筑物遭受破坏性地震时的非线性反应。结果表明,实际结构的抗灾性能比设计能力偏高,其抗震性能优良,抗风性能良好。     

多层结构抗风和抗震性能评估

采用PKPM和MSP(Multi-step pushover method)软件对某多层实验办公楼的抗震性能和抗风性能进行了评估。采用PKPM软件,在遭遇超越50年一遇风载及强烈地震情况下,评估其实际的抗风、抗震性能;采用MSP软件评估该建筑物遭受破坏性地震时的弹塑性反应。结果表明,实际结构的抗灾性能比设计能力偏高,其抗震性能优良,抗风性能良好,并且指出其设计存在局部隐患。     

气垫船垫升风机下蜗壳结构优化设计方法

下蜗壳结构是垫升风机与气垫船之间的关键部件,承担载荷传递和振动传递的作用,是影响气垫船结构设计安全的重要因素之一。通过对气垫船及垫升风机的工作方式分析,识别下蜗壳结构的主要结构风险,提出其结构分析要点及其优化设计方法。以某型气垫船垫升风机的下蜗壳结构为例,研究提出结构优化方案以解决原结构振动超标的问题,并从振动、强度、刚度和疲劳等方面分析结构优化设计方案的实际效果,可作为气垫船垫升风机下蜗壳结构设计的技术参考。     

大型锚机试验台结构设计与力学性能分析

为解决锚机测试设备存在的加载力、测试精度和实时性等问题,本文设计了一种塔架式动载试验台和液压缸式静载试验台相结合的大型锚机试验台,该试验台可进行200吨动载试验和400吨静载试验。针对试验塔架的几何结构,应用ANSYS有限元软件,对试验塔架进行理论强度分析、模态分析及特征值屈曲分析。建立的塔架有限元模型以及计算结果能为同类塔架的设计和优化提供理论依据。     

发动机油底壳模态和灵敏度分析

利用Pro/E软件建立某V型发动机油底壳三维实体模型,采用有限元分析软件MSC.NAS-TRAN计算油底壳的振动模态,并对油底壳进行结构灵敏度分析,根据计算分析结果提出相应的降噪措施。     

蒸馏水输送泵振动分析

针对蒸馏水输送泵振动偏大,运用频谱分析法对振动信号进行分析,通过对安装机架和水泵的模态分析确认了振动偏大的原因,在此基础上对过渡架进行改进,最终有效降低了机组的振动.     

The ScientificErrorAnalysis在机构误差分析中的应用

介绍了 ScientificErrorAnalysis软件包的使用,研究了基于 ScientificError Analysis软件包的误差分析方法与一般步骤,以平面四杆机构为例进行了公式推导,给出了计算实例的位置、速度与加速度方差曲线.     

江苏船舶工业优劣势分析

通过分析江苏船舶工业的发展现状,肯定了江苏船舶工业在地理位置、工业基础、劳动力、经营机制等方面的优势,指出了江苏船舶工业自主开发能力薄弱、技术设施落后、产品结构不合理等问题,为江苏船舶工业的科学发展规划提供依据。     

潜艇耐压壳体压环数值与实验分析相关性

代表潜艇壳体的环助柱壳一直是采用数值与实验方法进行研究。因制造工艺原因存在一些缺陷的结构,在试验中承受的外压力一直增加到结构压坏为止。为了模拟实验时在结构上所观察到的行为响应,采用有限元程序进行非线性数值分析。最初所进行的参数研究法利用了不同的模型和不同单元的代码库。为了一一列出最适用的网格,分析了所选择的单元对简化数据模型的适应性与网格精细对简化数值模型的影响。起初,分别应用试样上所测得的不同种     

浮式抗冰平台设计理念及水动力特性研究

钻探极地地区近海石油和天然气资源对移动式离岸钻井平台的水动力性能、抗冰性能和作业性能有着极大的要求。本文主要介绍了浮式抗冰平台的设计方案,并结合当今最新一款半潜式抗冰平台的设计理念,分别从频域和时域分析的角度与传统的半潜式平台作对比,分析得出其具有优越的水动力性能,垂荡、横摇、纵摇运动响应都优于传统的半潜平台,为下一步抗冰性能分析及其关键技术的研究做基础,同时也给半潜式平台带来新的设计理念,为浮式抗冰平台的设计建造提供合理思路。     

Design and model test of a soft-connected lattice-structured floating solar photovoltaic concept for harsh offshore conditions

Various types of floating solar photovoltaic (FPV) devices have been previously proposed, designed and constructed with applications primarily limited to onshore water bodies or near-shore regions with benign environmental conditions. This paper proposes a novel FPV concept which can survive harsh environmental conditions with extreme wave heights above 10 m. This concept uses standardised lightweight semi-submersible floats made of circular materials as individual modules. The floating modules are soft connected with ropes to form an FPV array. We first present the conceptual design of the floats and the connection systems, including hydrostatic, hydrodynamic, and structural assessments of the floats. To verify the motion response performance, we carried out 1:60 scaled model tests for a 2 by 3 array under regular and irregular wave conditions. From the time series and response spectra, the motion characteristics of the array and the mooring responses are analysed in detail. The proposed concept exhibits excellent performances in terms of modular motions with limited wave overtopping and no contact is observed between adjacent modules under the extreme wave conditions. The findings of this study can serve as a valuable reference to developing reliable and cost-effective FPV technologies for offshore conditions.     

Fatigue analysis of water intake risers: Hydrodynamic damping effect and a hybrid frequency-time domain method

The fatigue performance is key to the design of water intake risers (WIRs), which is a novel concept used to convey cooling water for liquefaction of natural gas at sea. To estimate the fatigue life, it is crucial to accurately predict the response amplitude of the WIRs, which is dominated by hydrodynamic damping. In operational conditions, the motion amplitudes of WIRs are usually smaller than their diameter, and thus leading to a flow regime of KC < 5. It is found in this flow regime; the hydrodynamic damping largely depends on the motion magnitude of the risers. To consider this coupling effect, a hybrid frequency-time domain fatigue analysis method is proposed, where a nonlinear stress transfer function is adopted. The hybrid method accounts for the coupling effect between the hydrodynamic damping and the structural motion. Significantly reducing the computational cost, this method provides results as accurate as that from a time domain analysis based on the relative velocity model with a constant drag coefficient. Furthermore, recommendations for further simplification of the fatigue analysis recognizing the coupling effect are given.     

可调长度高速三体船的概念及水动力研究

文章提出了一种新型高速三体船,阐述了它的优点及其应用前景。以DTMB5415为基础,构造了高速三体船型,并设计了8种布置情况,然后利用CFD对高速三体船的八种布置情况和单体船匀速航行时候的水动力性能进行了计算,并分析了不同布置情况下的兴波干扰情况和阻力性能,得出高速三体船的最佳布置方案,单位排水量的阻力下降约32%。     

基于AQWA的半潜式平台动力特性分析

依据三维势流理论并利用ANSYS AQWA软件对某半潜式平台进行建模。分析平台在恶劣海况下的水动力性能,并运用时域耦合的分析方法的得到了平台运动的时历曲线,同时对平台系泊锚链的系泊强度进行了校核计算。结果证明平台在恶劣海况下可安全有效的工作,本文的工作对于半潜式平台的相关设计有一定的参考意义。     

新概念FPSO总体方案设计研究

在分析国内外现有FPSO的优劣性及研究影响FPSO性能的诸多因素的基础上,开发一种稳性更好、水动力性能优良、储油效率高、具有较大承载能力和甲板面积,更适合采用多点系泊的圆角倒棱台形FPSO(IQFP)浮体概念。利用这种新型概念,根据渤海海域某边际油田的海洋环境条件和油田生产要求,以浮体的稳性和运动性能为主要约束条件,运用交互式设计流程思想,经过反复调整,得到一座较优的IQFP总体方案设计实例。     

气动载荷对半潜式海上风机运动响应的影响分析

以DeepCwind海上风机为研究对象,利用有限元软件ANSYS AQWA进行风机频域水动力数值仿真分析,得到水动力参数以及幅频响应曲线,将得到的水动力参数导入到FAST软件中,对风机气动-水动-锚泊系统的时域耦合运动分析。在此基础上,讨论了气动载荷对于半潜式风机运动响应的影响。结果表明,气动载荷对于半潜式风机运动响应的影响较大且不可忽略,横摇,横荡以及首摇运动随着气动载荷的增大而增大,垂荡运动随着气动载荷的增大而减小,风作用在叶片上所产生的气动阻尼削弱了垂荡运动,增强了横荡、横摇和首摇运动。     

半潜式风、潮流联合发电平台水动力分析（英文）

Energy shortages and environmental pollution are becoming increasingly severe globally. The exploitation and utilization of renewable energy have become an effective way to alleviate these problems. To improve power production capacity, power output quality, and cost effectiveness, comprehensive marine energy utilization has become an inevitable trend in marine energy development. Based on a semi-submersible wind-tidal combined power generation device,a three-dimensional frequency domain potential flow theory is used to study the hydrodynamic performance of such a device. For this study, the RAOs and hydrodynamic coefficients of the floating carrier platform to the regular wave were obtained. The influence of the tidal turbine on the platform in terms of frequency domain was considered as added mass and damping. The direct load of the tidal turbine was obtained by CFX.FORTRAN software was used for the second development of adaptive query workload aware software, which can include the external force. The motion response of the platform to the irregular wave and the tension of the mooring line were calculated under the limiting condition(one mooring line breakage). The results showed that the motion response of the carrier to the surge and sway direction is more intense, but the swing amplitude is within the acceptable range. Even in the worst case scenario, the balance position of the platform was still in the positioning range, which met the requirements of the working sea area. The safety factor of the mooring line tension also complied with the requirements of the design specification. Therefore, it was found that the hydrodynamic performance and motion responses of a semi-submersible wind-tidal combined power generation device can meet the power generation requirements under all design conditions, and the device presents a reliable power generation system.     

导管螺旋桨水动力与结构强度计算方法研究

随着导管螺旋桨应用的普及,计算与分析其水动力与结构强度的方法也越来越准确、快速、简便。以荷兰船模试验水池No.19A+Ka4—70螺旋桨为实例,详述了导管螺旋桨计算与分析的整体流程。通过MATLAB计算得到螺旋桨翼面与导管的空间坐标,在Pro/E中建立三维实体模型,在HyperMesh中建立CAE模型。以流体部分网格为分析对象,分别在Fluent与CFX中进行导管螺旋桨水动力分析,并比较了不同计算软件得到的导管螺旋桨水动力分析结果,为导管螺旋桨水动力计算提供了基本思路。以流体-固体网格为研究对象,在CFX平台上中进行流固耦合计算,得到螺旋桨的结构强度分析结果,拓展了螺旋桨结构强度分析方法。该水动力与结构强度分析与研究为导管螺旋桨总体设计提供了有效可行的方法。     

一种新型船模水动力性能测试装置研究

目前,国内外的船模水动力性能测试装置均为平面运动机构,使得船舶水动力导数的测量范围有限,而一种新型船模水动力性能测试装置,即六自由度船模水动力性能测试装置可以扩大这一测量范围.从六自由度平台的工作原理,六分力天平量程的确定和测试装置总体设计3个方面来具体研究和设计六自由度船模水动力性能测试装置.首先具体介绍六自由度平台的工作原理,即平台6根运动杆的运动与船舶六自由度运动的对应关系;然后建立船舶六自由度运动所受力和力矩的初步计算公式,以国内外平面运动机构的具体技术性能指标为依据,确定试验装置中的六分力天平的量程;最后确定测验装置的整体设计,设计出现有船池拖车平台的具体形状与尺寸.以此为依据,综合考虑拖车平台的受力情况及拖车架和六自由度平台的安装方式,确定拖车架的具体结构形式与尺寸大小,得到三维示意图、二维安装图与尺寸图,进行结构强度分析.