港口移动式气象智能监测系统设计

为了进一步提高港口船舶进出港航行海域微气象的实时观测和预警能力,提出移动式气象智能监测系统.该系统克服岸基观测点观测范围不变的局限性,针对作业拖轮而设计定制的气象智能监测系统.该系统主要由多参数一体化气象传感器、船载智能通讯模块、船载边缘计算终端、船载显控终端等组成,具有安装便捷、移动式观测、通讯稳定等特点.船载智能终端所附带的多参数一体化气象传感器用于收集多种气象指标,经过船载边缘计算终端即时处理气象数据,并上传至船载显控终端.由专业技术人员负责查阅审核,最终通过船载智能通讯模块借助4G通讯网络上传至岸基显控终端.该系统提高了观测数据的有效性和实时性,对于船舶在恶劣环境下的进出港安全和效率提升具有非常重要的意义.     

F2002大气监测车数据处理装置

大气污染监测车上装有气相色谱仪、电化学式分析仪器、漂尘测定仪等分析仪器和气象仪器,在连续测量的过程中能获得大气污染情况的大量数据;此外,还由石英钟提供时间参数。以上这些数据都需要及时加以处理。F2002大气监测数据处理装置就是装在监测车上的数据处理装置,它的作用是:     

基于STM32的便携式温、湿、压监测系统设计

为了满足应急气象监测提供及时准确的气象数据的需要,本文设计了一种基于STM32微控制器的便携式温湿压监测系统。该系统采用体积小、重量轻、功耗低的传感器采集温湿压数据,可连续对环境温度、湿度及气压进行观测,并在液晶屏上实时显示数据信息。同时使用C#语言编写上位机软件,实现温湿压数据的接收、显示及存储。该系统具有便携性、精度高、实时性好等特点,可作为应急气象监测系统的一部分进行温湿压监测。     

车载式环境监测系统的设计

为了及时有效的监测环境,提供有利的环境数据,设计了一种车载式环境监测系统,通过噪声传感器、粉尘传感器及气象传感器采集环境中的噪声、扬尘(PM2.5和PM10)及气象(风速、风向、雨量、气压、温度和湿度)参数,利用STM32F103的主控板进行数据处理,再通过WCDMA WIFI路由器传输将得到的环境数据上传,最后通过相机字符叠加、LED屏幕或平板电脑进行数据发布。此外,本系统附加了报警指示灯的功能和视频监控设备周围环境的功能。该系统环境数据采集稳定,实时性较高,可应用于移动式监测,是对现有定点监测的有效补充。     

微型气象探空仪的系统设计

研制一种基于GPS和GPRS的微型气象探空仪,介绍了其硬件工作原理和软件设计方案.探空仪以低功耗微处理器LPC932为核心进行温度、湿度、气压等参数的采集,利用GPS定位及测风,通过GPRS无线通讯方式将采集到的气象数据传输到地面监测中心服务器上,采用VC++设计服务器端监测界面,实现采集数据的实时显示、报表打印.经过放飞试验表明:所设计的探空仪能够在空中自动地完成气象数据的采集、处理与传输,方便地实现了大气边界层气象的实时探测.     

基于多种通信方式的海洋浮标站海洋气象灾害预警系统设计与开发

为了进一步加强海洋气象监测预警服务能力建设,文中设计了一种基于多种通信方式的海洋浮标站海洋气象灾害预警系统,系统由数据的采集、传输、处理、分析和发布5部分组成。数据的采集和传输部分主要负责收集和传输各类气象数据和信息,包括浮标和探测器实时数据、各类气象站点数据等,同时保障数据的质量和准确性,确保数据源可靠;数据的处理和分析部分主要负责对收集到的数据进行处理和分析,包括数据校正、整合、挖掘和模型建立等,形成各类气象灾害预测模型和预警指标,有效监测海洋气象灾害的发生并及时决策部署,为决策者和公众提供重要的参考和保障。     

便携式气象仪

“便携式气象仪”是针对市场需求，为适应小区域气候监测而设计的产品。可以广泛用于体育场馆和局域气候参数变化的及时测量，为各种赛事提供及时的气象信息。如为奥运会各场馆提供气象信息服务。该系统集成了温度、湿度、气压、风向、风速、经度、纬度、海拔高度、标准时间等气象参数的测量，其精度已经达到并超过普通气象测量的要求，通过系统机与测量单元的配合，将采集的数据存入气象日志数据库，并可以根据需求将当前天气状况通过移动通信网络发送至任何地点。该系统的价格远低于同类产品，为未来气象测量的小型化、实时化、便捷化，专业化提供了坚实保证。     

基于ZigBee技术的气象参数监测系统设计

利用ZigBee技术设计了气象参数监测系统,实现了无线远程分布式气象参数实时测量。介绍了系统的工作原理,并对系统的软硬件进行了研究与设计。     

基于多传感器信息融合的输电线路覆冰状态评估方法

由于目前监测技术和计算模型尚不完善,线路覆冰状态评估准确率不高。输电线路覆冰受多种因素影响,并且与微气象参数的相关性较大。为提高输电线路覆冰状态评估准确率,以输电线路在线监测系统为基础,综合考虑监测系统的等效覆冰厚度、微气象参数以及覆冰持续时间等,提出多传感器信息融合方法综合评估线路覆冰状态。BP神经网络融合线路覆冰隶属度值,输出覆冰状态概率,状态概率的不确定性再经过模糊推理,输出线路综合评估结果。通过现场监测,输电线路数据验证了该方法的准确性和可行性。     

鱼塘自动观测气象站数据处理软件的设计与实现

由广东省气象探测数据中心自主研发的鱼塘自动观测气象站已经在广东省农气站投入运行,有别于传统的鱼塘气象观测设备硬件架构。文章详细介绍了鱼塘自动观测气象站数据处理软件,基于多线程并发处理和串口通信技术。通过设计观测数据采集、要素数据分析提取、参数远程设置等功能模块,实现实时显示设备的观测数据以及运行状态,有效提高了鱼塘综合气象环境的监测能力及服务效率。实际应用效果表明,该软件运行稳定可靠,较好地满足了业务需求。     

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...     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

交通荷载作用下桥梁结构参数识别方法

应用动力节点加载法,将作用在桥梁上的交通荷载转化为等效节点荷载,再用两步构造法识别结构物理参数.第1步,用Newmark-β方法变换结构运动方程,并用结构的加速度响应求得变换空间内的位移、速度和加速度响应;第2步,基于最小二乘原理,构造出变换空间内求解结构参数的递推式,进行结构物理参数识别.数值模拟结果表明,在交通荷载作用下,该方法能够快速、准确地进行桥梁结构参数识别.     

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.     

RLS and LMS blind adaptive multi-user detection method and comparison in acoustic communication

RLS and LMS blind adaptive multi-user detection algorithm and multi-user detector was proposed to solve the problem of multi-user signal detection problem encountered in underwater acoustic communication networks.In simulation analysis,RLS and the LMS blind adaptive multi-user detector were designed and tested for synchronous and asynchronous multi-user communication process.The results of SIR comparison and MMSE comparison show that,both of the two methods can realize blind adaptive detection when any user change in multi-user communication,during this process,the training communication sequences are not needed.The RLS algorithm has about 5 dB higher in SIR compared with LMS algorithm,and the convergence velocity of RLS algorithm is also higher than LMS algorithm when the communication users change.RLS algorithm has better ability in multi-user detection than that of LMS algorithm,and it has great attraction and guiding significance for solving the problem of multiple access interference(MAI) in multi-user communication.     

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.