等跨弹性支座连续墙梁支反力计算分析

受均布荷载作用的等跨弹性支座墙梁,其支反力与多个参数有关,通过分析计算研究,本文提出支反力可据墙高跨度比Ｈ／Ｌ和支座相对刚度λ两个综合无量纲参数确定,采用有限元法通过大量的系列计算,文中给出２－５跨连续墙梁的支反力～λ－Ｈ／Ｌ关系图,便于快速查取支反力。     

夏季空调时PMV的图算和公式求解法的探讨

为了计算夏季空调时的PMV-PPD,分别在居室者静坐、站立或轻作业时,在相对湿度为20％、气流速度为0．1m／s-0．5m／s,室内空气温度（=平均辐射温度）为22℃-30℃的条件下,与PMV的关系进行图解化。并在图解出PMV的基础上,导出求解不同环境条件下PMV的计算公式,为空调技术提供了简单计算PMV的方法。     

确定定容封闭弹性驱动油藏地质储量的压降法和诺模图

基于定容封闭未饱和油藏的物质平衡方程式,本文提出了压降法(在直角坐标纸上P_R与N_pB_O的关系法)和诺模图(在双对数坐标纸上ΔP_D与N_pB_o的关系图)。这些方法的应用,可以确定未饱和油藏的原始地质储量和判断驱动类型。     

确定岩质坡面上结构面迹线侧伏特征的算图

 分析结构面与坡面交切的特征,并对结构面及其迹线按交切性质进行分类。对比二者及交线的赤平投影和平面投影关系,提出判断交切关系及迹线侧伏性质的特征三角形,其结构简单、操作直观。结合产状要素变量间共点、共线原理,编制确定其迹线侧伏特征的诺模图,显示在定向数值空间中结构面交切性质的分区分布规律;运用其中的各种图解操作,有助于结构面定位定向数据的收集、复核,夯实岩体结构分析的数据基础。     

凸轮基圆半径的计算机辅助设计方法

本文以对心直动滚子推杆盘形凸轮机构为例，介绍了确定凸轮基圆半径的诺模图的计算机辅助绘制方法．对程序中公式稍加修改即可用于其他类型凸轮机构诺模图的制作．利用文中程ｃａｍ．ｃ序还可直接用计算机计算出凸轮最小基圆半径．计算、绘图软件实用，便于工程技术人员使用，设计质量和效率将得到很提高．     

一种简易的piper三线图的微机绘制方法的改进

本文介绍了用 Microsoft Visual Basic for Windows语言改写绘制 piper三线图程序的方法,该方法对改写其它老版本源程序使其增加新的活力有参考意义。     

一种用于小径管环焊缝射线检测的偏心距图

在对小径管环焊缝进行倾斜透照椭圆成像时,先要计算出射线机射线源焦点相对于焊缝中心平面的偏心距.设计了一种由曲线图和诺模图组合而成的偏心距图,依据给定的参数值,用直尺可快速准确地从偏心距图上获取偏心距值.该偏心距图为现场实际检测工作提供了便利,同时也可作为快速验证工具,用以对操作指导书中偏心距规定值是否准确进行快速核验.     

聚丙烯酰胺分子量算图

根据ＧＢ１２００５．１和ＧＢ／Ｔ１２００５．１０，制作了聚丙烯酰胺的分子量算图，由一已知浓度和测得的相对粘度方便地读出特性粘数和分子量。     

特高压屏蔽测试大厅弱电抗干扰施工原理与工艺

2000k V交流特高压屏蔽测试大厅是利用电磁屏蔽原理,在其内部进行特高压设备研发测试的工艺装置。在测试过程中,存在电晕放电,特高压交变电磁场干扰。弱电集成研究在监控大厅内用屏蔽技术消除辐射干扰及穿越屏蔽层消除、抑制传导干扰方法。屏蔽效能列线图验算,解决了屏蔽效能的工程验算;截止波导管的概念及工程验算,滤波器安装,光纤应用,接地介绍了传导干扰抑制方法。高速球防浪涌设计,屏蔽网线、机柜及门禁系统安装介绍了屏蔽的应用实例。期待对EHV环境弱电施工提供工程借鉴。     

Calibration of a probabilistic cohesive zone model for generating a fracture nomograph

In the recent years, Cohesive Zone Models (CZMs) have gained increasing popularity for modelling the fracture process [ 1 ] and also in other applications like composite de‐lamination [ 2 ] solder failures [ 3 ] in circuits, etc. This can be attributed to the ability of the CZM to adapt to the nonlinearities in the process it represents by adjusting the model parameters. These parameters that are selected to represent the material behaviour in the vicinity of the crack or a damage zone are non‐deterministic in nature resulting in random fracture strength estimates. Currently, there are no standardized tests for measuring the CZM parameters and their random scatter. Numerous researchers in the literature suggest values for the CZM parameters based on their experience from limited test data. Traditionally, fracture toughness is determined through coupon tests for any material system that is being analysed using Linear Elastic Fracture Mechanics to determine the fracture strength of a specimen. Since data for fracture toughness are available, this research is aimed at determining the probability density functions (PDFs) for the cohesive zone parameters that would give the same scatter in fracture strength as that obtained from the test statistics. Correlations between the model parameters were introduced to improve the accuracy of the fracture strength PDF. A finite width cracked plate was selected as a test case to demonstrate the process. This paper also presents evidence that material scatter can be isolated from the geometric effects to determine a normalized PDF of fracture strength for a given material. This normalized PDF can then be scaled, using mean fracture strength, to any crack configuration to develop a nomograph that can be used to rapidly assess risk without the need for a probabilistic fracture analysis.