IFM能力验证球压测试实践

球压试验是对电工电子产品中聚合材料进行的一种重要的性能测试。本文详尽介绍了球压测试国际能力验证测试过程的关键要点,整理总结了球压测试压痕测量的相关类别和注意事项,提出了对于球压测量不确定度分量的特定分析和计算方法。

High Sensitivity Digital Instantaneous Frequency Measurement Receiver for Precise Frequency Analysis

There are numerous applications, such as Radar, that leverage wideband technology. However, the presence of noise introduces certain limitations and challenges. It is crucial to harness wideband technology for applications demanding the rapid and precise transmission of diverse information from one point to another within a short timeframe. The ability to report a signal without tuning within the input bandwidth stands out as one of the advantages of employing a digital wideband receiver. As indicated, a digital wideband receiver plays a pivotal role in achieving high precision and accuracy. The primary distinction between Analog and Digital Instantaneous Frequency Measurement lies in the fact that analog Instantaneous Frequency Measurement (IFM) receivers have traditionally covered extensive input bandwidths, reporting one accurate frequency per short pulse. In the contemporary landscape, digital IFM systems utilize high-sampling-rate Analog-to-Digital Converters (ADC) along with Hilbert transforms to generate two output channels featuring a 90-degree phase shift. This paper explores the improvement of sensitivity in current digital IFM receivers. The optimization efforts target the Hilbert transform and autocorrelations architectures, aiming to refine the system’s ability to report fine frequencies within a noisy wide bandwidth environment, thereby elevating its overall sensitivity.

洪水分析软件IFMS/Urban特点及应用

当前,国内的洪水分析软件研发存在实用性、通用性较差等问题。为弥补行业短板,中国水利水电科学研究院依托全国重点地区洪水风险图编制项目,联合南京水利科学研究院、河海大学、山东大学及大连理工大学等单位的专家学者,并与北京航天宏图信息技术股份有限公司和南京慧水软件科技有限公司合作.

IFMS Urban软件在城市洪水风险图编制中的应用

依托全国重点地区洪水风险图编制项目,开展了通用洪水分析软件研发,形成了两个软件产品,即IFMS(Integrated Flood Modeling System)和IFMS Urban(Integrated Urban Flood Modeling System)。IFMS Urban开发了高分辨率二维地表洪水分析计算引擎、快速非结构网格生成模块,集成国内外广泛使用的SWMM(Storm Water Management Model)管网模型,并基于自主研发的GIS平台,完成了模型的前后处理功能研发,实现城市管网与二维模型耦合。介绍了IFMS Urban在成都市、呼和浩特市和太原市等城市典型应用示例,表明其完全具备处理复杂的城市洪水问题的能力。

基于IFMS的青衣江洪雅县城区段洪水风险分析

以眉山市洪雅县城区作为研究区域,利用IFMS软件构建青衣江洪雅段一二维耦合水动力模型,研究不同重现期下的洪水对洪雅县城区的淹没影响.采用青衣江洪雅水文站的设计洪水成果及2020年青衣江8月16日到8月18日实测洪水过程率定模型参数,并结合现状堤防情况验证模型计算结果的合理性.分析计算结果表明,洪雅县城区段在遭遇20年一遇重现期以下洪水时,具有较好的防御能力;在遭遇20年一遇重现期以上洪水时,城区将遭受不同程度淹没影响,对人民群众生命财产安全威胁较大.为了进一步减少灾害损失,同时提高区域整体的防洪减灾能力,因此需要在采取工程措施保障的基础上兼顾进行非工程措施的研究.

基于IFMAS-Interface总线系统在数控大型轧辊磨床上的应用

着重介绍了IFMAS-Interface总线系统在MK84250/H大型数控轧辊磨床上的硬件和软件的组态方法,通过PLC硬件组态设置,将IFM AC1335网关挂到西门子Profibus-DP总线上建立通讯,从而保证了IFM总线系统能够正常运行。IFMAS-Interface总线系统的出现和发展,有效地促进网络集成自动化系统和工业控制系统,现场总线技术融合技术构建的全集成自动化系统及信息网络技术,可以有效地减少机床布线、节约成本、降低机床故障率、提高生产效率,具有推广前景。

Cone Bearing Estimation Utilizing a Hybrid HMM and IFM Smoother Filter Formulation

Cone penetration testing (CPT) is a widely used geotechnical engineering in-situ test for mapping soil profiles and assessing soil properties. In CPT, a cone on the end of a series of rods is pushed into the ground at a constant rate and resistance to the cone tip is measured (qm). The qm values are utilized to characterize the soil profile. Unfortunately, the measured cone tip resistance is blurred and/or averaged which can result in the distortion of the soil profile characterization and the inability to identify thin layers. This paper outlines a novel and highly effective algorithm for obtaining cone bearing estimates qt from averaged or smoothed qm measurements. This qt optimal filter estimation technique is referred to as the qtHMM-IFM algorithm and it implements a hybrid hidden Markov model and iterative forward modelling technique. The mathematical details of the qtHMM-IFM algorithm are outlined in this paper along with the results from challenging test bed. The test bed simulations have demonstrated that the qtHMM-IFM algorithm can derive accurate qt values from challenging averaged qm profiles. This allows for greater soil resolution and the identification and quantification of thin layers in a soil profile.

ifm efector推出efector Octavis——用于检测机械运转情况的振动监测器

近日，ifm efector公司推出了efector Octavis振动监测器，该产品能对工作在恶劣环境中的机器(如抽水泵、电机压缩机、风扇和纺锤等)进行监测，以保护这些机器上的旋转轴承，防止其失衡或受损。Octavis永久性地安装在固定设备上，它通过振动分析对机器的运转情况进行持续监控。

利用IFM控制器的AD输入端口实现开关量输入的扩展

德国IFM公司生产的移动式控制器,在工程机械领域有着广泛的应用。本文设计了一种扩展模块,可以利用控制器单路的AD(模拟量)输入,扩展出四路开关量输入,从而解决控制器在实际使用过程中,开关量输入不足,而AD(模拟量)输入有冗余的情况。扩展模块在摊铺机上进行了测试和应用,满足了实际的应用需求。

Methodology for Obtaining Optimal Sleeve Friction and Friction Ratio Estimates from CPT Data

Cone penetration testing (CPT) is a cost effective and popular tool for geotechnical site characterization. CPT consists of pushing at a constant rate an electronic penetrometer into penetrable soils and recording cone bearing (qc), sleeve friction (fc) and dynamic pore pressure (u) with depth. The measured qc, fs and u values are utilized to estimate soil type and associated soil properties. A popular method to estimate soil type from CPT measurements is the Soil Behavior Type (SBT) chart. The SBT plots cone resistance vs friction ratio, Rf [where: Rf = (fs/qc)100%]. There are distortions in the CPT measurements which can result in erroneous SBT plots. Cone bearing measurements at a specific depth are blurred or averaged due to qc values being strongly influenced by soils within 10 to 30 cone diameters from the cone tip. The qcHMM algorithm was developed to address the qc blurring/averaging limitation. This paper describes the distortions which occur when obtaining sleeve friction measurements which can in association with qc blurring result in significant errors in the calculated Rf values. This paper outlines a novel and highly effective algorithm for obtaining accurate sleeve friction and friction ratio estimates. The fc optimal filter estimation technique is referred to as the OSFE-IFM algorithm. The mathematical details of the OSFE-IFM algorithm are outlined in this paper along with the results from a challenging test bed simulation. The test bed simulation demonstrates that the OSFE-IFM algorithm derives accurate estimates of sleeve friction from measured values. Optimal estimates of cone bearing and sleeve friction result in accurate Rf values and subsequent accurate estimates of soil behavior type.

Technique for Estimating the Cone Bearing Smoothing Parameters

Cone penetration testing (CPT) is an extensively utilized and cost effective tool for geotechnical site characterization. CPT consists of pushing at a constant rate an electronic cone into penetrable soils and recording the resistance to the cone tip (qc value). The measured qc values (after correction for the pore water pressure) are utilized to estimate soil type and associated soil properties based predominantly on empirical correlations. The most common cone tips have associated areas of 10 cm2 and 15 cm2. Investigators also utilized significantly larger cone tips (33 cm2 and 40 cm2) so that gravelly soils can be penetrated. Small cone tips (2 cm2 and 5 cm2) are utilized for shallow soil investigations. The cone tip resistance measured at a particular depth is affected by the values above and below the depth of interest which results in a smoothing or blurring of the true bearing values. Extensive work has been carried out in mathematically modelling the smoothing function which results in the blurred cone bearing measurements. This paper outlines a technique which facilitates estimating the dominant parameters of the cone smoothing function from processing real cone bearing data sets. This cone calibration technique is referred to as the so-called CPSPE algorithm. The mathematical details of the CPSPE algorithm are outlined in this paper along with the results from a challenging test bed simulation.

新型饲草揉碎机可靠性预测与分配的研究

试验针对新型饲草揉碎机工作过程中普遍存在关键零部件故障率较高且整机可靠性较低的问题,采用专家评分法对饲草揉碎机进行可靠性预测,改进综合因素法(IFM)进行可靠性分配。结果显示,饲草揉碎机可靠性预测值为0.668,无法满足我国饲草揉碎机可靠性标准要求。基于预测结果对可靠性进行重新分配,为转子与动力传动部分分配了较低的失效率权重、较高的可靠度;为揉碎机机体分配了较高的失效率权重、较低的可靠度。重新分配各子系统可靠度后,整机的可靠度为0.90259,满足饲草揉碎机系统可靠性要求。研究表明,研究可为饲草加工机械可靠性预测与分配提供方法参考。

基于Copula函数的区域降水联合分布与特征分析

为深入研究降水时空分布特性,以便为流域水资源合理配置提供科学依据,以广东省东江流域内32个代表雨量站1956～2009年月降雨量资料为例,根据泰森多边形法计算四个子区间的面雨量,采用边际插值函数法(IFM)估计Copula函数参数,通过AIC信息准则确定研究时段内任意两相邻区间面雨量指标的联合分布。结合历史雨量极值组合所对应的重现期计算结果表明,东江流域降水时空分布不均匀,前汛期时段流域水资源状况较为安全,流域上游水资源状况也较为安全,后汛期与枯季时段流域下游水资源状况最为严峻。基于Copula函数方法与传统面雨量频率分析方法相比,能更全面地反映降水的分布特征。

基于IFM技术的捷变频雷达综合测试仪

介绍了一种基于瞬时测频（ＩＦＭ）技术的非相参捷变频雷达综合测试仪的设计方法。应用该仪器可以在捷变频状态下对捷变频雷达导引头进行各种性能测试，解决了捷变频雷达导引头不能在捷变频状态下进行测试的难题。

基于AD8302的瞬时测频接收机

为了简化瞬时测频(IFM)接收机的结构、提高集成度,设计了采用AD8302为核心的IFM接收机,并分析了该测频接收机的灵敏度、动态范围、测频精度等关键指标。最后制作了实验系统对该IFM接收机的可行性进行了验证,实验结果表明采用AD8302实现的IFM接收机可以提高测频精度,简化接收机结构。

一种基于IFM技术新的捷变频雷达导引头测试方法

介绍了一种在捷变频状态下对非相参捷变频雷达导引头进行性能测试的方法，并介绍了基于ＩＦＭ技术的捷变频雷达模拟目标回波信号和模拟干扰信号的产生方法，实践证明，用该方法对捷变频雷达导引头进行测试，其测试结果较传统测试方法更能反映雷达导不在实践中的工作性能。

时域分离法提高IFM接收机的测频能力

将时域分离法用于IFM接收机中,以提高IFM接收机在连续波信号和射频脉冲信号同时存在时的测频能力.

IFM技术及其在捷变频雷达测量仪器设计中应用

在瞬时测频技术(IFM)的基础上,介绍了一种基于IFM技术的捷变频雷达测量仪器的设计方法,应用该仪器可以在捷变频状态下对非相参捷变频雷达导引头进行测试。

基于IFM PLC内置计时器的时序控制研究

IFM PLC在工程机械行业的电气系统中广为应用,但其时序控制偏差一直困扰着控制系统设计人员。针对IFM PLC时序控制的偏差问题,根据Codesys编程环境中使用内置计时器的不同情况,对问题进行深入研究,指出了产生问题的根本原因。并基于内置计时器的特性及使用场景,提出了几种控制偏差的方法,实现了时序偏差的精确控制,在提高了时序控制精确度的同时,降低了由于时序问题产生BUG的可能性,保证设备电气性能的及时性和准确性。最后利用实例验证了该时序控制方法的可行性及有效性。

介绍丹麦农场综合管理系统IFMS

介绍丹麦农场综合管理系统ＩＦＭＳ刘世洪（中国农科院计算中心）信息作为一种资源被称为是现代化社会经济发展的三大支柱之一。在丹麦的农业生产中，采用先进的农场内决策支持系统，强化信息的综合管理。丹麦农民创造了一种适合自身生产方式的综合农场管理模式，其可塑性...