Construction simulation approach of roller-compacted concrete dam based on real-time monitoring

The parameters of existing roller-compacted concrete (RCC) dam construction simulation are usually fixed based on experience while the actual construction conditions of an RCC dam change during the process of the project. The simulation accuracy of an RCC dam is therefore reduced because the change has not been considered. A new method for RCC dam construction simulations based on real-time monitoring is presented in this paper. First, real-time monitoring technology is used to collect and analyze the actual construction information. Second, meteorological data obtained from the real-time monitoring system are analyzed using the fuzzy average function method, and the weather conditions of the next stage are forecasted. Then the construction schedule simulation model is updated via the Bayesian update method. Results of the analysis are used as the input to the construction simulation parameters, and the construction simulation is performed. A real-world engineering example is presented to compare the simulation results with the actual construction schedule. The results demonstrate that the method can effectively improve the accuracy and real-time performance of construction simulations.     

Theory and application of system integration for real-time monitoring of core rock-fill dam filling construction quality

The theory and method of system integration for the real-time monitoring of core rock-fill dam filling con- struction quality are studied in this paper. First, the importance analysis of system integration factors is carried out with the analytic hierarchy process. Then, according to the analysis result of integration factors, the conceptual model of system integration is built based on function integration, index integration, technology integration and information integration, the index structure of core rock-fill dam filling construction quality control is constructed and the method of function integration and technology integration is studied. The mathematical model of process monitoring is built according to monitoring objective, process and indexes. Research results have been applied in Nuozhadu core rock-fill dam construction management, realizing system integration through building appropriate monitoring work flow and comprehensive information platform of digital dam.     

树莓派平台下的实时监控系统开发

以Raspberry PI开源硬件平台作为图像服务器,通过TCP/IP协议与连接在同一个路由器上的IP摄像头通讯,实现一个在线实时监控系统;开发了一个基于TCP/IP协议的客户端,可以使得接驳于同一路由器上的客户端实现实时监控.实验证明该系统能够稳定正常运行,可靠性较高.     

基于柔性传感器的青少年健康实时监控系统设计

采用碳黑/硅橡胶复合柔性传感器研制低成本、低能耗、微体积的可穿戴式设备,实现多种青少年基础生理指标的集成检测。通过对运动时生理体征参数变化量的动态感知、传输和管理分析,解析个体的体征状况的变化趋势,研究干预方案执行过程的动态跟踪与监测技术难题,构建闭环的健康服务系统,通过对健康服务短期、中期、长期效果的量化测评以保证青少年保持健康的生活方式。     

Sensor placement of long-term health monitoring for large bridges based on the real-time correction of finite element model

The process of optimized placement of long-term health monitoring sensors for large bridges generally begins with finite element models, but there will arise great discrepancies between theoretically-calculated results and actual measurements. Therefore, rectified finite element models need to be rectified by virtue of model rectifying technology. Firstly, the result of construction monitoring and finished state load test is used to real-time modification of finite element model. Subsequently, an accurate finite element model is established. Secondly, the optimizing the layout of sensor with following orthogonality guarantees orthogonal property and linear independence for the measured data. Lastly, the effectiveness and feasibility of method in the paper is tested by real-time modifying finite element model and optimizing the layout of sensor for Nujiang Bridge.     

考虑气象因素影响的大坝监测沉降小波分析

为了消除大坝沉降监测数据受温度、湿度及光照等气象因素及外界不确定因素的噪声响应,提出考虑气象因素影响的大坝监测沉降小波分析方法.首先建立原始监测数据与各气象因素的函数关系,进而消去气象因素对坝体沉降的影响,然后采用小波分析对监测数据进行去噪处理,最后得到大坝真实的荷载响应沉降曲线,为大坝稳定性评价提供依据.实例应用表明,考虑气象因素影响的大坝监测沉降小波分析方法能有效地去除气象因素及外界不确定因素引起的噪声响应,比小波直接去噪法效果更佳,与数值模拟计算值能较好地吻合,具有更好的实际应用价值.     

基于GPRS大坝安全信息系统的设计

介绍了GPRS的技术优势及其应用系统的组网和GPRS数据接入方法,提出了基于GPRS大坝安全信息系统的设计方案,详细介绍了基于GPRS大坝安全信息系统的硬件系统组建及软件系统各模块的具体功能要求,具有实际的应用价值。     

Simulating the particle size distribution of rockfill materials based on its statistical regularity

1. Introduction Rockfill has excellent engineering characteristics, such as good compactness, better seepage ability, high density, low sedimentation, high shear strength and so on. So it is widely used in dams, bed of railway and deep foundations[1-2]. Two types of rockfill are commonly used in constructions, that is inartificial rockfill such as gravel and scree, and blasted rockfill, e.g. fragmental stone, macadam and moraine soil. Both types are hetero-geneous mixture composed of numerous …     

Rockfill dam compaction quality evaluation based on cloud-fuzzy model

The quality of compaction is key to the safety of dam construction and operation. However, because of incomplete information about the construction process and the unknown relationship between compaction quality and the factors that influence it, traditional evaluation methods such as neural networks and multivariate linear regression models fail to take uncertainty fully into account. This paper proposes a cloud-fuzzy method for assessing compaction quality by considering randomness, fuzziness, and incomplete information. The compaction parameters and material source parameters are the key parameters in the assessment of compaction quality. A five-layer neural-network model of compaction quality assessment is established that considers compacted dry density and its classification membership and probability as the criteria, and the rolling speed, rolling passes, and compacted layer thickness as alternatives. Because of uncertainties in the criteria and alternatives, the cloud-fuzzy method, in which a fuzzy neural network is extended with a cloud model to handle uncertain and fuzzy problems more effectively, is introduced to determine the compaction quality. A case study is presented to evaluate the compaction quality of a hydropower project in China. The results indicate that the cloud-fuzzy model is feasible in relation to precision and makes up for the sole focus on precision by traditional methods. The proposed method provides a triple index for understanding compaction quality, which facilitates assessment of the compaction quality of an entire dam surface.     

基于等效一致黏弹性边界的重力坝抗震分析

在结构-地基的抗震动力分析中,有限元法通常是通过对模型施加弹簧-阻尼器或者无质量地基的方法来模拟地震的辐射阻尼效应,其工作量较大。在ADINA程序中采用等效三维一致黏弹性边界单元对三维黏弹性人工边界进行模拟,建立三维有限元模型,在模型的边界上延伸一层实体单元,利用黏弹性边界的弹簧-阻尼器的系数公式推导出边界单元的弹性模量和阻尼系数,并赋值给边界材料参数。利用地震响应时程分析法,对带有等效一致黏弹性边界的重力坝模型计算得出的结果与以无质量地基的方法来阻止地震波在边界反射的计算结果相比较,得出使用等效三维一致黏弹性边界来模拟地震辐射阻尼的抗震性能更好,可大大减少建模工作量,为复杂结构进行抗震分析提供了新的方法。     

Transformer real-time reliability model based on operating conditions

Operational reliability evaluation theory reflects real-time reliability level of power system. The component failure rate varies with operating conditions. The impact of real-time operating conditions such as ambient temperature and transformer MVA (megavolt-ampere) loading on transformer insulation life is studied in this paper. The formula of transformer failure rate based on the winding hottest-spot temperature (HST) is given. Thus the real-time reliability model of transformer based on oper- ating conditions is presented. The work is illustrated using the 1979 IEEE Reliability Test System. The changes of operating conditions are simulated by using hourly load curve and temperature curve, so the curves of real-time reliability indices are ob- tained by using operational reliability evaluation.     

智能化建设的工程建设管理模式优化

科学技术的不断发展推动了信息化时代的到来,与此同时建筑项目也在不断的朝着智能化的方向在发展,对于建筑企业来说,建设管理的话题贯穿于企业生存和发展的每一个阶段,也是建筑施工企业的核心内容,本篇文章旨在通过对智能化建设工程建设管理过程中存在的问题做出相关的探讨,以期为智能化建设的发展提供些许参考。     

温度计在三峡大坝安全监测中的应用

坝体混凝土在水化热、水温、气温、太阳辐射等因素的影响下,其内部温度发生变化会引起坝体裂缝等情况出现,因此,温度计作为大坝温度监测的一种有效手段,通过分析温度计的观测数据就可知坝体内部温度分布和变化的趋势.     

基于FPGA的内部信号实时监测方法研究

文章论述了利用SignalTapⅡ嵌入式逻辑分析仪如何实时监测FPGA内部信号,通过一个十进制计数器的设计实例,阐述用SignalTapⅡ对FPGA调试的具体方法和调试步骤。     

大坝安全监测仿真实验控制系统的研究与开发

大坝安全监测仿真实验系统是一种动态模拟实验系统.介绍了大坝安全监测仿真实验系统的总体设计方案.其实验系统共分为两个部分:大坝形变模拟和大坝安全监测子系统,其中大坝形变模拟子系统选择了单机集中控制方案.采用快速高效、具有可视化控件编程功能的Delphi 7.0作为应用程序的开发工具.两个子系统之间存在通信信号,以便完成整套系统的全自动运行.此系统的开发成功,大大提高了水利水电动模实验室的自动化水平,方便了教学、科研和实验工作.     

基于CSCW的实时答疑系统设计

研究了计算机支持的协同工作在实时答疑系统中的应用,提出了实时答疑系统的模型设计方案．在实现方案中,提出了系统的总体模块设计架构与总体流程图的设计,并对实时协同中涉及的信息共享与并发控制两个关键模块详述其解决方案．最后,设计了电子白板进行实验,对测试数据进行了分析．     

基于NetFlow的网络流量实时计算模型

本文以主干路由器实时收集NetFlow流数据为模型输入,提出网络流量实时计算模型.首先分析流持续时间等测度对模型参数的影响,考虑长流等特殊情形,接着基于统计理论选择流量计算窗口及流量计算公式,并通过统计推断最终获得真实网络流量.本文最后通过模型计算结果与同期SNMP数据比对,验证了该模型能够在一定精度范围内完成流量实时计算,从而满足多层次实时网络监测需求.     

基于实时仿真器的开放式机器人实验平台

针对电气工程、自动化、机械工程等专业的教学需求,设计了基于通用实时仿真器的全开放机器人实验平台。实验平台采用模块化设计,上位机示教与监控、轨迹规划、机器人正逆运动学计算和驱动装置完全开放,具有实时性好、通用性强和程序开发便捷的特点。利用该平台能够进行机器人写字、搬运以及机械本体、驱动器、示教程序设计等多种实验,有利于培养学生的动手能力、独立思考能力和创新能力。     

机电一体化实验教学改革探索与实践

文章针对当前高校机电一体化实验教学中存在的不足,从改革实验教学模式入手,给出了一种机电一体化实践教学新模式,对其主要内容和特点进行了介绍。通过实践,使学生的观察能力、综合设计与创新能力、实践动手能力及分析和解决问题的能力得到明显的提高,为培养综合实用型人才打下了坚实基础。