基于交互多模型的水下目标跟踪方法(英文)   总被引：1，自引：0，他引：1  

Weiming Xu  Yanchun Liu  Xiaodong Yin 《地球空间信息科学学报》2008,11(3):186-190

According to the requirements of real-time performance and reliability in underwater maneuvering target tracking as well as clarifying motion features of the underwater target, an interacting multiple model algorithm based on fuzzy logic inference （FIMM） is proposed. Maneuvering patterns of the target are represented by model sets, including the constant velocity model （CA）, the Singer mode~, and the nearly constant speed horizontal-turn model （HT） in FIMM technology. The simulation results show that compared to conventional IMM, the reliability and real-time performance of underwater target tracking can be improved by FIMM algorithm.  相似文献   

爆破夯实技术在水下地基处理中的应用          下载免费PDF全文

张维正 《探矿工程》2006,33(10):60-62

以某杂货码头和集装箱重力式码头水下地基处理工程为例，介绍了其地基处理的爆夯试验过程，得出了一次性爆破夯实厚层块石抛石基床的爆夯参数，并对其施工过程进行了监测。总结了类似工程施工的经验与教训。  相似文献   

湖泊水下数字高程模型建模方法及应用模型     

邓雪清  张永生  李波  班业胜 《华东地质学院学报》2003,26(2):192-196

介绍了当前湖泊水下地形测量的一般方法和作业过程。针对逐点插入构建不规则三角网算法，本文提出了效率改正算法和格网索引号快速计算算法。基于不规则三角网，给出了湖泊水下数字高程模型的一般应用模型——任意点高程计算、填挖方计算模型及等深线计算模型。  相似文献   

水下无源导航系统仿真匹配算法研究   总被引：15，自引：1，他引：15  

张飞舟  侣文芳  晏磊  葛远声 《武汉大学学报(信息科学版)》2003,28(2):153-157

针对水下无源导航(地形辅助导航)系统的特点，充分利用各种海洋地理特征传感器获取信息，进行数据预处理、算法分析、性能评估，然后进行智能数据融合，进而完成水下无源导航系统模块化的仿真设计，为水下无源导航系统的进一步研究提供可行的方法和技术。仿真结果表明，采用水下地形匹配辅助导航，能够有效地修正惯导误差达到设计要求，为真实海洋环境下的精确导航提供可靠的技术依据。  相似文献   

应用砼的流变性计算砼的灌注参数          下载免费PDF全文

张泽业 《探矿工程》1996,(3):12-13

应用流体力学、流变学的理论，方法和施工实测数据，建立水下灌注理导管埋深，砼在灌注系统的流动阻力与导管内附加砼柱间的数学表达式，以指导水下灌注施工在最优灌注参数下进行。  相似文献   

A smoothed particle hydrodynamics modelling of soil–water mixing and resulting changes in average strength     

Wangcheng Zhang  Mark F. Randolph 《国际地质力学数值与分析法杂志》2020,44(11):1548-1569

Soil–water interaction is a pivotal process in many underwater geohazards such as underwater landslides where soil sediments gradually evolve into turbidity currents after interactions with ambient water. Due to the large deformations, multiphase interactions and phase changes this involves, investigations from numerical modelling of the transition process have been limited so far. This study explores a simple numerical replication of such soil–water mixing with respect to changes in average strength using smoothed particle hydrodynamics (SPH). A uniform viscoplastic model is used for both the solid-like and fluid-like SPH particles. The proposed numerical solution scheme is verified by single-phase dam break tests and multiphase simple shear tests. SPH combinations of solid-like and fluid-like particles can replicate the clay–water mixture as long as the liquidity index of the solid-like particles is larger than unity. The proposed numerical scheme is shown to capture key features of an underwater landslide such as hydroplaning, water entrainment and wave generation and thus shows promise as a tool to simulate the whole process of subaquatic geohazards involving solid–fluid transition during mass transport.  相似文献   

Underwater Navigation Based on Real-Time Simultaneous Sound Speed Profile Correction   总被引：1，自引：0，他引：1  

Kai Zhang  Yong Li  Jianhu Zhao  Chris Rizos 《Marine Geodesy》2016,39(1):98-111

Precise sound speed profile (SSP) information is critical when using sonar for underwater terrain navigation. Nevertheless, acquiring SSP information in real-time is difficult, especially in underwater navigation environment. To account for this problem, this paper presents an underwater navigation method that applies real-time SSP correction to the terrain measurements. The method uses a probe to measure the surface sound speed simultaneously. Meanwhile, redundancy of topographic measurement data is exploited to derive the equivalent SSP information. The acquired equivalent SSP is updated continuously with particle filter algorithm. The terrain measurements can be corrected in real-time with the equivalent SSP to improve the performance of underwater terrain navigation. By removing the impact of inaccurate SSP from the terrain measurements, the proposed method can achieve precise and robust underwater navigation result without using an underway-profiling instrument. Simulated results confirm the good performance of the proposed method.  相似文献   

An Analytical Solution for Dynamic Response of the Plate with Different Impedances Subjected to Underwater Explosion     

陈莹玉  姚熊亮  肖巍 《海洋工程》2016,(3):329-342

In this paper, the transmitted part of the incident wave is considered to revise Taylor’s solution, which is used to extend its application for analytical models to predict the response of the plate with different material properties. The influence of the material properties and the boundary condition of the plate on fluid and structural dynamics is systematically investigated. The analytical results are compared with those of detailed dynamic FE simulations and the two are in good agreement. The results indicate that the analytical method is valid and suitable for the plates with different material properties subjected to underwater explosion. It is found that Taylor’s results of the plate with small impedance are invalid, which indicates a potential application field for the analytical method.  相似文献   

脐带缆在潜器下放过程中的运动建模与仿真   总被引：1，自引：0，他引：1  

李霄霄  马宁  刘晗  顾解忡 《海洋工程》2016,34(2):47-55

潜器在下放布置过程中需要考虑变长度的脐带缆对其运动的影响,在考虑流的情况下,对脐带缆的有限差分模型进行了改进,并采用最小二乘方法求解由时间和空间上的中心差分格式离散后的非线性方程组。为了验证模型改进的有效性,将潜器在均匀定常流中水平匀速直航时的数值解与该特殊情况下的解析解进行比较,两组解的吻合不仅证实了模型改进的有效性,而且表明上述数值计算方法是可靠且有效的。在潜器下放布置运动给定的情况下,脐带缆的运动仿真结果表明,潜器姿态角的调整会对拖曳点处的缆绳张力大小和变化趋势产生显著的影响,流在改变缆绳空间形状的同时引起了缆绳对潜器作用力和力矩的非线性和时变性,脐带缆总是阻止潜器自身动力对运动速度和姿态角的改变,且对纵荡运动的影响最大。  相似文献   

漂浮式水上钻探平台的设计与应用          下载免费PDF全文

宋宝杰  栾东平  范晓军  翟育峰 《探矿工程》2021,48(6):74-79

根据贵州省清水江三板溪水电站低温水治理隔水幕墙试验工程中水下钻孔的施工工艺和要求,设计了漂浮式水上钻探平台。平台主要由甲板、定位系统、吊装系统、钻探施工系统组成。甲板作为水上载体,主要是用来提供浮力及工作台面;定位系统用来完成平台在水中的移动及固定;吊装系统主要功能是在悬臂吊旋转半径内完成平台上相关物资、大型工器具等的起吊移动;钻探施工系统即实施钻探工作,完成水下钻孔。通过现场实际应用,该平台设计合理,相关配套符合要求,完全能够满足项目所需水下钻孔的钻探工作。平台的成功应用,为以后类似项目在作业平台及钻探施工设备的选用配套上提供了借鉴。  相似文献