RS码频域纠错编码在激光对潜通信信道中的实现方法

介绍了信道编码在激光对潜通信系统中的重要作用，介绍了频域编译ＲＳ码的基本方法，并给出了脉冲位置调制信道的ＲＳ码频域编译码的计算机模拟方法和结果。     

常规潜艇电力推进系统仿真研究

电力推进在常规潜艇主动力系统中已被普遍采用,是动力系统的重要组成部分.潜艇电力推进系统运行工况众多,变化范围广泛,要对其进行动稳态特性分析,确定最优化的航行工作制均比较困难.因此,对潜艇电力推进系统建立合理的数学模型,并进行仿真研究成为必需.针对潜艇电力推进系统的主要部分分别建立了其准确的数学模型,以各航行工况为基础进行了仿真研究.仿真结果表明,所建立的模型具有一定的合理性与通用性,能很好地满足工程精度需求不仅可为电力推进系统的性能仿真提供依据,而且根据需要可应用于半实物仿真系统.     

基于HLA的潜艇作战训练系统设计

通过对潜艇作战流程的分析,设计了潜艇作战训练系统的基本结构。系统基于分布式高层体系结构技术,和潜艇作战系统互连,构成一个逼真、交互性强的半实物仿真训练环境。与传统的潜艇训练系统相比,不仅支持作战设备操作流程的训练,还支持特定战场态势下的战术对抗演练,满足潜艇作战训练的新要求。另外,以特定训练任务为例,对联邦开发过程进行了初步研究。     

Plumes of discolored water of volcanic origin and possible implications for algal communities. The case of the Home Reef eruption of 2006 (Tonga, Southwest Pacific Ocean)

The Home Reef volcano (Tonga, Southwest Pacific Ocean) erupted in August 2006. Initially a submarine eruption it quickly evolved into a subaerial event upon the formation of an ephemeral island.Remote sensing data from different sensors including MODIS, ASTER, EO-1 ALI and Landsat-7 ETM+ were used to analyze the event, focusing on the plumes of discolored water, ocean chlorophyll-a concentration (OCC) and sea surface temperature.An early classification system for the plumes was devised based on spectral properties and point of origin. Plumes originated at the volcano were named Type-I and those associated to the pumice rafts Type-II.Anomalies in ocean chlorophyll-a concentration, measured using MODIS data, were analyzed and a large bloom, presumably dominated by Trichodesmium sp. was identified. The bloom, which contributed to OCC values 17 times higher than the background, was spatially and temporally coincident with a Type-I plume of discolored water. The OCC increase appears to have been caused by a combined effect of both ocean fertilizations by the subsurface volcanic plume and rising sea surface temperatures.The Home Reef event offers a good candidate for a case of ocean enrichment by a submarine volcano and highlights the need for continuous monitoring of the eruptions even after the end of the explosive, more spectacular stages.     

Probabilistic cost prediction for submarine power cable projects

It is estimated that Europe alone will need to add over 250,000 km of transmission capacity by 2050, if it is to meet renewable energy production goals while maintaining security of supply. Estimating the cost of new transmission infrastructure is difficult, but it is crucial to predict these costs as accurately as possible, given their importance to the energy transition. Transmission capacity expansion plans are often founded on optimistic projections of expansion costs. We present probabilistic predictive models of the cost of submarine power cables, which can be used by policymakers, industry, and academia to better approximate the true cost of transmission expansion plans. The models are both generalizable and well-specified for a variety of submarine applications, across a variety of regions. The best performing statistical learning model has slightly more predictive power than a simpler, linear econometric model. The specific decision context will determine whether the extra data gathering effort for the statistical learning model is worth the additional precision. A case study illustrates that incorporating the uncertainty associated with the cost prediction to calculate risk metrics - value-at-risk and conditional-value-at-risk - provides useful information to the decision-maker about cost variability and extremes.     

海底管道悬跨处理灌浆袋装置液压托举机构设计与实验

为了解决海底管道悬跨现象所带来的疲劳破坏问题,进行了灌浆袋处理装置的研究,提出了一次吊装可完成多处悬跨处理的装置总体方案,介绍了工作原理。运用三维建模、机构受力分析及有限元法进行了托盘托举机构的设计,确定了液压缸参数。针对两侧副液压缸同步性要求,进行了PID控制的液压缸的同步回路设计及仿真分析,采取试凑法确定了比例、积分与微分参数。最后,加工出样机进行了托举机构伸缩运动实验,结果验证了设计的合理性、可行性。该装置能够代替潜水员一次性下海进行海底多处悬跨管道的填充处理作业,提高了作业效率,因而,具有一定的海下工程应用意义。     

三山岛北部海域金矿大规模海下开采地表岩移预测分析

三山岛北部海域金矿赋存于海平面下,设计生产能力达到12 000t/d,水下开采技术难度大,若矿体开采强度过高、顶柱隔离层保留不足,将可能造成海床沉降变形,引发海水倒灌的风险。根据矿床开采技术条件,在获取有限岩石力学参数条件下,本次采用软件模拟分析了海下矿床上向充填法开采条件下的地表岩移特征。研究结果表明,地表沉降变形最大值分布于矿体上盘区域,随着开采由深部逐渐转入浅部区域,地表沉降变形不断增大,研究建议留设160m顶柱,能够保证海下矿体安全开采。     

基于UG的摄像头夹子注塑模设计

在分析塑料成型工艺和产品结构特点的基础上,基于UGNX7.0的MoldWizard模块,对摄像头夹子注塑模具的设计过程进行了详细的阐述。与传统的注塑模设计相比,应用UGNX7.0的MoldWizard模块进行注塑模设计,可以大大缩短产品研发周期、模具设计周期和加工周期,有效保证注塑模设计的准确性,提高设计效率,降低成本。该模具设计采用潜伏式浇口保证了塑件的表面质量,采用弹簧复位防止合模时与侧滑块产生干涉。     

潜射导弹运载器水弹道动力学系统辨识

运用基于单纯形的模拟退火算法对某潜射导弹运载器水弹道动力学系统进行了辨识,并探索了未建模不确定性及待辨识参数矢量的维数对辨识精度的影响。结果表明：未建模不确定性对辩识精度的影响较大,而待 辨识参数矢量维数的影响较小;在克服未建模不确定性后,通过采用现代辨识技术可以获得系统的较完善模型。     

潜艇武器系统综合仿真系统及关键技术

论述了加快潜艇武器装备研制与发展的重要性,指出了现有潜艇武器装备研制仿真支撑环境的不足,为满足潜艇武器系统装备研制需求,基于数字仿真建立了支持半实物仿真试验的潜艇武器系统综合仿真系统.介绍了新研的潜艇武器系统综合仿真系统的构成和特点,重点阐述了研发过程中解决的声纳仿真建模中水声传播损失计算、潜用鱼雷武器仿真中鱼雷弹道逻辑设计与制导控制建模、系统总体设计与集成等关键技术,最后介绍了该仿真系统的应用情况以及对应用前景进行了展望.