海底观测网络次接驳盒硬件设计与实现

深海海底观测网络是针对深海海底探测与研究而提出的课题。在海底观测网中,为了实现对水下各种观测信息的实时采集和水下各种传感设备的控制,设计了一种基于SOC片上系统的海底观测网络次级接驳盒电路控制系统。采用模块化设计思想,构建了包括主控芯片模块、数据采集模块、电能控制模块、视频监控模块的次级接驳盒电路控制系统。试验测试结果表明,该系统能够可靠稳定地运行,为海底观测网络的长期运行提供了保证。     

深海阀门载荷分析

在对海底管线载荷类型归纳的基础上,分析深海阀门载荷的种类及组合方式。对波浪、海流规律进行研究,采用莫里森方程计算深海阀门受到的波流作用力,采用极限地震应力法或动力分析法对深海阀门抗震能力进行分析。     

气象水文自动观测系统在石油平台的研究与应用

本文介绍了气象水文自动观测系统在石油平台的研究与应用,系统采用ADCP剖面海流计,S4浪流潮仪等先进传感器,设计了先进的PC／104总线采集设备,采用Inmarsat-C卫星传输方式,获得了大量宝贵的实时观测资料以及存储资料。     

5000m深海扬矿管运动状态影响因素分析

深海采矿扬矿管处于海洋环境之中，受海浪、海流以及采矿船拖航的影响，会发生大的偏移。研究分析了海浪、海流、采矿船拖航速度、中间矿仓质量以及扬矿管与采矿船连接方式对扬矿管的影响，可为系统设计、布局、运行和控制提供参考。     

深海多传感器信息实时传输系统设计

采用中国船舶重工集团公司第710研究所研制的军用高精度三分量磁传感器、自行研制的三通道AD采集器、电子罗盘和深度计组成深海地磁场三分量采集系统,并对该采集系统自行设计了一套信息实时传输系统。在广东省肇庆地震台,通过实测数据与肇庆地震台台站观测数据对比,表明测量数据可靠并具有良好的一致性,同时验证了实时传输系统的可靠性和稳定性。     

缆系海底观测网原型系统设计

针对长期、实时和原位观测深海大洋的科学需求,设计了采用10 kV直流输电和100 Mb/s光纤通信的缆系海底观测网原型系统。该系统由海底科学节点、光电复合海缆和海岸控制基站组成,其中海底科学节点包括原位化学分析仪器、动力环境监测仪器和节点接驳盒。用户从数据管理子系统实时获取科学数据,从电能监控子系统远程监控仪器状态,进行海底原位实验。多次压力实验和水池联调后,该系统在中国东海浅海试验和美国蒙特雷湾海底观测网深海并网试验中运行稳定,从海底获取了大量高分辨率的科学数据。试验证明该设计合理可行,并体现缆系海底观测网较传统海洋观测方式有较大优势。     

卡尔曼滤波技术在高干扰环境下海流测量中的应用

声学多普勒流速剖面仪(ADCP)测流技术是目前海流测量中最先进的技术之一,在海流测量中应用越来越广泛.但在高干扰条件下,由于其本身测量原理所致,测量结果往往会夹杂一些干扰信号,造成测量结果与真实结果有一定大的误差.文中介绍一种利用卡尔曼滤波技术,使用Percent Good4作为参数,对ADCP海流测量数据的实时滤波处理方法.实践证明,滤波的效果比较令人满意.     

海洋浮标上海流计安装方式的研究

本文分析了科研人员利用海流计长期探测某一海域海流数据的实际困难,并结合海流计的基本原理及大型海洋浮标的结构特点,研制出了一种大型海洋浮标上海流计固定装置。采用该装置固定海流计,不但海上安装作业简单、安全,而且可充分利用已有海洋浮标的硬件及软件资源,实现数据实时传输。通过这种办法,我们即解决了利用海流计长期探测某一海域海流数据的实际困难,同时又解决了海流计数据实时传输问题,从而节省了大量的人力与物力。     

深海张力腿平台非线性涡激振动响应特性分析

针对深海平台张力腿的非线性动力学问题,充分考虑张力腿的非线性特性,提出了一种改进的动力学模型,并利用伽辽金法和有限差分法对模型进行计算,研究波浪、海流、预张力、平台运动等复杂荷载联合作用下张力腿的涡激振动响应特性。计算结果阐明了复杂海洋环境下张力腿平台的动力学机理。研究结果可为深海平台的设计和研究提供参考。     

深海潜标系统电池舱的设计与分析

针对深海潜标系统观测仪器,设计了一种径高比满足黄金分割比的电池舱.按照压力容器设计准则,对这一深海潜标系统电池舱进行了选材、强度计算和稳定性校核,应用Workbench有限元软件对电池舱的强度和稳定性进行了模拟分析,确认电池舱满足水下承压20 MPa的要求.应用这一电池舱,可以使深海潜标系统观测仪器具备长时间工作的能力...     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

Limits of topographic measurement by the scanning tunnelling and atomic force microscopes

Parameters describing the topographic character of a surface (height, surface wavelength, slope and curvature) can be derived from equivalent sinusoidal profiles. The response of a surface-measuring instrument may be modelled in terms of instrument parameters such as stylus radius, and scanning range and resolution. The performance of the instrument may then be mapped as a zone in amplitude-wavelength (AW) space to show the sinusoidal profiles it is capable of measuring. In a first-order analysis the STM and AFM are considered as equivalent to contact-stylus instruments with a notional stylus radius equal to the tip radius plus the gap. Comparisons between different instruments and types of instrument are readily made by mapping in AW space. The error arising from convolution of the sinusoidal profile with that of the finite tip may be quantified and plotted as contours in AW space.