补偿器设计中鬼像定量仿真分析

针对定性分析方法无法彻底避免鬼像影响检测的现象,在理论分析的基础之上,提出补偿器鬼像定量仿真分析方法.借助光学分析软件,在设计阶段彻底避免鬼像影响检测,并结合实例,说明定性分析方法的局限性,验证定量仿真分析方法的有效性.该分析方法为补偿器的设计分析提供定量分析方法,提高了补偿器研制的成品率,提高了补偿检验精度,对高精度补偿检验技术具有重要意义.     

小波分析与傅里叶分析的比较及其在故障诊断中的应用

小波分析是傅里叶分析的发展与延拓。本文首先对小波分析与傅里叶分析的概念及特征进行比较，然后简要论述了这两种分析方法在故障诊断中的应用。     

资源型城市产业转型中接续产业选择问题分析

提出以判定工业化发展阶段、产业竞争力分析、产业发展趋势与结构调整效益分析、区位分析相结合的方法,研究资源型城市接续产业选择问题,并以东营为例,演示该方法的有效性.其中,在判定工业化发展阶段中采用四项指标综合评判;在产业竞争力分析中采用因子分析法;在结构调整效益分析中采用SS模型;在区位分析时着重考虑区位经济互补问题.在实证基础上,提出资源型城市选择接续产业时需着力避免跟风攀比、盲目照搬和飞地经济三种倾向.     

Cluster Analysis for IR and NIR Spectroscopy: Current Practices to Future Perspectives

Supervised machine learning techniques have become well established in the study of spectroscopy data. However, the unsupervised learning technique of cluster analysis hasn’t reached the same level maturity in chemometric analysis. This paper surveys recent studies which apply cluster analysis to NIR and IR spectroscopy data. In addition, we summarize the current practices in cluster analysis of spectroscopy and contrast these with cluster analysis literature from the machine learning and pattern recognition domain. This includes practices in data pre-processing, feature extraction, clustering distance metrics, clustering algorithms and validation techniques. Special consideration is given to the specific characteristics of IR and NIR spectroscopy data which typically includes high dimensionality and relatively low sample size. The findings highlighted a lack of quantitative analysis and evaluation in current practices for cluster analysis of IR and NIR spectroscopy data. With this in mind, we propose an analysis model or workflow with techniques specifically suited for cluster analysis of IR and NIR spectroscopy data along with a pragmatic application strategy.     

我国铁路工程勘察设计质量指标和因素统计分析

为深入了解我国铁路勘察设计质量的现状,开展了较大范围的问卷调查工作。调查的内容主要包括两个部分:铁路勘察设计质量的现状以及影响铁路勘察设计质量的主要因素。在问卷调查的基础上,利用SPSS软件对统计数据进行了频数分析、描述性统计分析、相关性分析、因子分析等。通过对调查问卷的统计计算,分析了我国铁路勘察设计质量的现状及存在的主要问题,分析了影响我国铁路勘察设计质量的主要因素,并提出了相应的对策。     

燃料运输容器跌落姿态分析技术

目的总结燃料运输容器跌落分析流程,设计合理的姿态分析方案,通过分析使燃料运输容器设计满足GB 11806规定的跌落试验要求。方法使用动力有限元方法对新燃料运输容器进行多姿态多工况的跌落分析,并根据试验结果对分析结果进行验证,将分析和试验经验总结成完整的分析流程。结果通过分析,新燃料运输容器在正常运输条件下的最不利跌落姿态为9°小角度跌落,该工况下容器外壳最大变形量为49 mm。事故运输条件下最不利跌落姿态为正向垂直跌落,燃料组件最大冲击力为1.78 MN。结合分析和试验结果总结了容器最不利跌落姿态的分析流程和技术要点。结论结合分析和试验结果,得到了新燃料运输容器各跌落试验的最不利跌落姿态,并总结了燃料运输容器跌落分析的通用流程。     

Coupling analysis method for a large-scale structure exposed to synchronous hoisting loads

Large-scale synchronous hoisting equipment is widely used in the construction field. A coupling analysis method for global and local structures exposed to synchronous hoisting loads under working conditions is presented. An integrated analysis flow based on virtual prototyping is provided for the coupling analysis process with different design and simulation software tools, which includes project design, CAD and CAE model-building and interchange, data coupling and analysis. The theoretical basis of finite element analysis for synchronous hoisting loads is deduced. A practical case of the coupling analysis for a large-scale structure exposed to synchronous hoisting loads is studied and validated. The coupling analysis method can well improve the analysis level and efficiency to predict the mechanical effects in an operating situation.     

结构有限元离散化模型的响应相关检验方法

应用时间序列分析理论,在时域内建立了有限元计算响应与试验响应的相关分析数学模型。通过悬臂梁试验和底部固定半开口圆桶试验的实际相关分析,验证了该响应相关分析理论的正确性和实用性,从而为有限元离散化模型的应用可靠性判断及模型修正提供了一种简单适用的方法。     

Evaluating environmental and social impact assessment in developing countries

Feasibility studies of industrial projects consist of multiple analyses carried out sequentially. This is time consuming and each analysis screens out alternatives based solely on the merits of that analysis. In cross-country petroleum pipeline project selection, market analysis determines throughput requirement and supply and demand points. Technical analysis identifies technological options and alternatives for pipeline routes. Economic and financial analysis derive the least-cost option. The impact assessment addresses environmental issues. The impact assessment often suggests alternative sites, routes, technologies, and/or implementation methodology, necessitating revision of technical and financial analysis. This report suggests an integrated approach to feasibility analysis presented as a case application of a cross-country petroleum pipeline project in India.     

The evolution of patent mining: Applying bibliometrics analysis and keyword network analysis

Text mining methods allow researchers to investigate technical documents (tech mining) and specifically explore patents for valuable information (patent mining. To the review literature and analyze the evolution of patent analysis and patent mining methods, bibliometrics analysis and keyword-based network analysis is applied on 143 papers extracted from the 'Web of science' database. Bibliometrics analysis was applied to determine top players researching in patent mining. Applying cluster analysis on the keyword network shows three main stages of patent analysis evolution. Also, it is discussed how patent mining is evolutionized in terms of information retrieval, pattern recognition and pattern analysis.     

核工程贮液容器的工程抗震计算

介绍了几种针对结构－液体耦合振动问题的工程算法。它们将规范规定、理论分析与结构的有限元计算结合起来,为贮液容器的抗震计算提供了一条新的思路。     

基于相干分析的高铁简支箱梁结构噪声源识别方法研究

列车荷载作用下桥梁结构振动产生的低频结构噪声会给轨道交通沿线环境带来噪声污染问题,该文给出了基于相干分析的桥梁结构噪声源识别方法。首先确定了频谱分析与相干分析相结合的噪声源识别方法,介绍了频谱分析法、常相干分析、偏相干分析的方法和流程,给出了偏相干分析中最优线性条件输入模型的迭代求解,编制了相应的Matlab程序;其次针对成灌铁路一座高架桥的振动与噪声综合试验的实测数据,结合频谱分析和常相干分析方法讨论了桥梁结构振动的噪声辐射机理,通过偏相干分析对桥梁结构噪声进行了噪声源分离与识别,由重相干函数的分析可以定性得到结构噪声的影响区域。综合分析表明,相干分析结合频谱分析的噪声源识别方法可以得到结构局部振动与所辐射的结构噪声之间的相互关系,能较好地分离识别存在相干关系的各结构噪声源的独立贡献和频谱特性,可以为桥梁结构的减振降噪措施提供理论指导。     

A Knowledge Based Approach to Integrated Battle Damage Assessment and Repair Analysis

1IntroductionBDARanalysisisacomPlexworkaildakindofanalysistechniquewhichcanbeusedtodetenninebattledaInagemodeanditsrecoverysotgyHavingnoeffectivewaysfordeteninningBDARinfonnationcurrently,wehavetodirechytakeoraPplysomeresearchmethodswhichareuscdinreliabilitymaintainability,survivability,vulnerability,weaponefficiencyandsoon,suchasFMEA/DMEA,MA,FTA,andvulnerabilityanalysis.Theseinfonnationandanalysisresultscomefromtheexperienceandki1owledgeofthedomainexpertS.Therefore,thispaPerprovides…     

不确定度分析方法在暖通空调实验中的应用

本文介绍了不确定度分析在暖通空调专业的应用方法,并结合传热实验和热值测定实验来阐述总体不确定度分析和详细不确定度分析的方法,为暖通空调专业应用不确定度分析提供参考。     

Sensitivity analysis approaches applied to systems biology models

With the rising application of systems biology, sensitivity analysis methods have been widely applied to study the biological systems, including metabolic networks, signalling pathways and genetic circuits. Sensitivity analysis can provide valuable insights about how robust the biological responses are with respect to the changes of biological parameters and which model inputs are the key factors that affect the model outputs. In addition, sensitivity analysis is valuable for guiding experimental analysis, model reduction and parameter estimation. Local and global sensitivity analysis approaches are the two types of sensitivity analysis that are commonly applied in systems biology. Local sensitivity analysis is a classic method that studies the impact of small perturbations on the model outputs. On the other hand, global sensitivity analysis approaches have been applied to understand how the model outputs are affected by large variations of the model input parameters. In this review, the author introduces the basic concepts of sensitivity analysis approaches applied to systems biology models. Moreover, the author discusses the advantages and disadvantages of different sensitivity analysis methods, how to choose a proper sensitivity analysis approach, the available sensitivity analysis tools for systems biology models and the caveats in the interpretation of sensitivity analysis results.     

无轨伸缩式门式起重机接触部位的有限元分析

非线性接触分析在处理接触问题时可以更加接近工程实际,但在实际应用中,接触参数设置复杂、计算效率低以及计算收敛性难以保证等因素制约了它的实用性。节点耦合分析是不存在收敛问题的线性分析,计算成本比接触分析低。为了探讨2种模型在应用中的差异,研究节点耦合线性分析代替非线性接触分析的可行性,以起重量为12 t的无轨伸缩式门式起重机为例,在有限元分析软件ANSYS中分别构建其接触模型和节点耦合模型,考虑接触刚度和摩擦系数对计算结果的影响,在伸缩支腿全伸的工况下比较2种模型下无轨伸缩式门式起重机各接触部位等效应力值的差异。通过对比计算结果发现：2种模型中,最大等效应力均出现在车架施加起升载荷处,计算值相差1.3%,结果差异不大。由于节点耦合分析忽略了摩擦系数,所以2种模型中各接触部位等效应力值存在差异,根据接触部位的相对滑动,在接触模型中选择合适的摩擦系数可减小此差异。研究结果表明：考虑接触区域相对滑动对计算结果的影响,节点耦合分析能较好地模拟接触分析,对于精度要求不高或接触区域基本无相对滑动的模型,可采用节点耦合分析这种简化方式来代替接触分析,以提高计算效率。     

MEMS扭转微镜动态特性的有限元仿真分析

使用有限元方法分析了MEMS扭转微镜在真空无阻尼状态下的各项动力学特征,包括模态分析、谐响应分析、瞬态响应分析等,获得了微镜器件的模态固有频率、振型以及谐响应频率,重点研究了扭转微镜的不同部位振动状态之间的差别。     

基于B/S模式的弹药失效诊断评估系统研究

为了提高通用弹药产品可靠性评估的效率,实现产品失效及可靠性的系统化辅助分析评估,对通用弹药产品的失效过程进行研究,总结出产品的一般失效分析过程、失效诊断方法及弹药失效分析数据字典.在辅助分析系统中,提供了失效分析、可靠性评估、FMECA等模块.应用Java、JSP等语言,在B/S模式下进行设计开发,实现了对产品失效的过程分析及产品可靠性评估.优化可靠性统计分析的数学模型,改进评估参量算法,使评估工作效率提高30%以上,参数精度达到小数点后8位.     

模块化职务分析

章总结了职务分析方法在我国的应用情况，分析了需求特点，引入模块化的思想，提出了新的职务分析方法——模块化职务分析，认为职务分析的关键就是将工作中的各项任务进行整理，组成不同的工作模块。建立计算机辅助管理系统，时时调整、修改工作模块，对工作模块进行组合，形成职务，从而使职务分析趋于动态化。