LNG船液舱围护系统结构极限承载力研究

在船舶尺度和营运状态与传统条件发生很大变化的情况下,大型液化天然气船(LNG)液舱晃荡研究显得尤为重要。本文首先介绍了LNG船液舱围护系统的结构特点,然后以15.68万立方LNG船液舱围护系统结构为对象,采用非线性有限元方法计算其极限强度,并比较分析3种边界条件下的结果,最后用试验和解析公式验证本文方法是可行的,适用于工程设计。     

基于战术动作的舰艇作战指挥过程建模

针对舰艇作战过程的模拟仿真,在分析了舰艇作战指挥过程的构成与特性的基础上,将舰艇作战过程分解为我、敌及战场环境3个动作序列,并提出了基于作战过程分解的态势模型。进一步将作战过程分解为基本战术动作,并分析了作战目的和态势对作战动作转换的驱动机制,建立了基于基本战术动作的舰艇作战过程模型。     

基于水上交通冲突技术的船舶定线制警戒区安全评价*

针对以分道通航制为主的船舶定线制没能解决各主要交通流汇集区域的船舶会遇问题,结合我国船舶定线制发展的特点,分析了交通冲突技术应用于船舶定线制警戒区安全研究的有效性,提出了一种以水上交通冲突技术(VTCT)和灰色聚类为理论依据的船舶定线制警戒区交通安全评价方法。应用该方法,对宁波-舟山港核心港区深水航路船舶定线制的共4个警戒区及1个环形通道的交通安全状况进行评价,评价结果为安全诊断和优化船舶定线制的设计方案等提供了依据。     

中小型LNG船推进方式选型思考

文中具体对比分析几种推进方式,着重对比双车双舵及吊舱式推进方式,为中小型LNG及其它注重操作性的船舶的推进方式选型提供参考.     

欠驱动不对称水面船舶输出反馈镇定控制

研究了一类欠驱动不对称船舶的全局一致渐近输出反馈镇定控制问题。该船舶横向上未装备驱动装置,加速度带有不可积的非完整约束条件,并且惯性参数矩阵和阻尼参数矩阵中的非对角线元素允许存在非零项。由于欠驱动船舶的速度和角速度不易测量,设计了高增益观测器估计速度状态变量。通过对系统进行坐标变换,并结合高增益观测器,根据分离原则设计了欠驱动不对称船舶的全局时变光滑输出反馈镇定律,仿真结果验证了所提方法的有效性。     

论渔船技术经济论证中的若干问题

对渔船技术经济论证工作中的若干问题进行了探讨，并就我国近年来的远洋柔鱼钓渔业生产环境给出了相应算例，揭示了渔船技术经济分析工作中存在的若干规律。其结论可供有关论证部门及决策部门参考。     

新型实船测试平台的研究

提出一种新型的船舶实船测试平台,对该平台的结构、传感器的选择和系统的集成给出了详细的阐述,并介绍了实船测试平台的用途。实船测试实例表明,该测试平台工作稳定可靠,性能良好。     

川东北高含硫气田压力容器设计

高含硫气田中的压力容器腐蚀应重点考虑应力腐蚀开裂。详细分析了高含硫气田压力容器设计中应着重考虑材料因素、环境因素和加工因素。为了确保产品的质量,基于设计中应重点考虑因素与国内外成功经验,针对罗家寨高含硫气田压力容器的设计,明确提出了材料化学成分限制与探伤、制造等特殊的附加要求。另外,还应进一步提高高含硫压力容器设计水平。     

69.8m三用工作船的噪声预报与控制

对69.8 m三用工作船的主要噪声源进行优化控制,基于统计能量法进行舱室噪声预报,根据预报结果对目标舱室采取针对性降噪措施。实船验证结果显示,该船满足HAB入级要求,取得ABS证书。该研究方法和结论对于现阶段国内船厂所面临的降噪难题有较大的应用参考价值。     

Experimental study on the nonlinear pressure acting on a high-speed vessel in irregular waves

The present study focuses on the nonlinear behavior of pressure on the hull surface of a high-speed vessel in irregular waves, particularly the pressure responses of alternately wet and dry areas near the waterline and on the bow zone. The vessel has high deadrise angles that may be subject to slight impact and water pile-up effects. A series of experiments in regular and irregular head waves were conducted, and the validity of applying Volterra modeling was investigated. In a previous article using experimental data in regular waves, it was confirmed that the approximate third-order Volterra model adequately simulated the variation of pressure responses in regular waves of different steepness up to a wave amplitude with a wavelength ratio of 0.01, even for the highly nonlinear pressures acting on the abovementioned areas of the hull surface. In this article, further validation for the second part of the study was obtained using experimental data in irregular waves. The frequency response functions obtained from the previous study’s experimental data in regular waves were applied to the third-order Volterra model by combining the input of irregular waves to simulate the responses in irregular waves of sea state five. Then, the spectra and statistics were analyzed. For the motions, accelerations, and pressure responses in irregular waves (as well as for the simulated time histories) variance spectra and statistics such as cumulative distributions of peak values and probability density functions were compared with the experimental results. It was confirmed that even for highly nonlinear and non-Gaussian pressures on the abovementioned areas of the hull surface, the approximate third-order Volterra model simulates the pressure responses in irregular head waves up to a sea state of five with adequate accuracy on deterministic and statistical bases.