利用MATLAB建立不确定度评定测量模型分析变量的相关系数

在测量不确定度中,运用MATLAB模拟生成相关随机变量,评定随机变量先关系数,可以提升评定结果的准确性,符合实际需求。以下本篇基于具体变量分析问题,浅析如何通过MATLAB建立不确定度评定测量模型,分析变量的相关系数。     

基于C#和MATLAB的实用测量数据处理

介绍一种C#结合MATLAB进行测量数据处理的思想,举一个简单水准网的例子着重阐述在C#中调用MATLAB的组件具体操作步骤以及C#与MATLAB数据类型之间的相互转换问题。     

试卷生成系统

为指导教学和给考试命题工作提供科学数据,试卷生成系统应运而生。该系统前台开发工具为VB,采用Microsoft Access为后台数据库,通过该系统生成试卷并考试,有关部门可以实现对试卷的信息化管理,取代以前的手工管理,减少工作压力,提高工作效率。     

频率自动测量的设计及实现

本文对频率自动测量作了简要介绍,探讨了运用VB语言快速、准确、方便地对频率信号进行自动测量和分析的特点。     

一种基于MATLAB的植物叶片参数测量系统

提出了一种基于MATLAB的植物叶片参数自动测量系统方案.该系统利用扫描仪获取包含标定物的叶片图像,对其二值化后进行边缘跟踪,获得标定物和叶片的边界,最后借助标定物的实际直径和面积得到叶片的面积、周长、长、宽等参数.经对两种叶片进行的实验.结果表明,此系统能够快速、准确地进行叶片参数的自动测量,具有较高的效率和实用性.     

基于VB和Access数据库的真空系统设计软件构建

本文通过大量的调研工作并根据真空系统设计原理和设计流程,建立了真空系统设计软件开发的过程模型,采用Visual Basic 6.0与Access数据库构建了真空系统设计应用软件。软件主要由启动模块、真空室参数设置模块、真空泵参数设置模块、抽气时间计算模块、保存工程模块等主要模块组成,适用于各真空段。采用计算机软件设计真空系统可以提高计算精度,大幅度提高真空系统的设计效率,缩短开发周期。     

基于组合测量的电容器标定及其软件实现

本文介绍了基于组合测量的电容器标定方法及其在Matlab和Visual Basic混合编程环境下开发的软件系统,实例证实了该软件用户界面友好,计算正确,运行速度快,克服了手工计算时间长,易出错的缺陷.     

用VB6.0实现PC机与三菱FX2n系列PLC编程口的通信

介绍三菱FX2n系列PLC编程口串口通信的连接、通信协议、读/写命令和格式,用VB6.0实现读/写PLC数据寄存器的方法。     

VB与MATLAB混合编程及其在叶片寿命预估中的应用

介绍VB与MATLAB混合编程的一种方法。利用VB编写人机交互界面,利用MATLAB的神经网络工具箱,建立基于BP神经网络的叶片寿命预估系统。通过将叶片的初始信息输入系统,得到汽轮机末级叶片寿命的预估值。其通用的BP网络构建、训练和测试工具,减少了开发人员与MATLAB语言开发的工作量。经验证,该系统灵活、准确,具有实用性。     

VB与MATLAB混合编程及其在叶片寿命预估中的应用

介绍VB与MATLAB混合编程的一种方法。利用VB编写人机交互界面,利用MATLAB的神经网络工具箱,建立基于BP神经网络的叶片寿命预估系统。通过将叶片的初始信息输入系统,得到汽轮机末级叶片寿命的预估值。其通用的BP网络构建、训练和测试工具,减少了开发人员与MATLAB语言开发的工作量。经验证,该系统灵活、准确,具有实用性。     

压电陶瓷驱动电源及其在激光陀螺扫模中的应用

对压电陶瓷微位移器驱动电源与环形激光陀螺腔长调节原理进行了分析 ,在此基础上 ,设计了微机控制 0～ 30 0 V电压连续可调压电晶体驱动电源 ,并将其应用于自行设计的环形激光陀螺自动扫模系统。实验获得的扫模曲线表明 ,该驱动电源能够满足环形激光陀螺扫模系统的要求     

Inference for Errors-in-Variables Models in the Presence of Systematic Errors with an Application to a Satellite Remote Sensing Campaign

Motivated by a satellite remote sensing mission, this article proposes a multivariable errors-in-variables (EIV) regression model with heteroscedastic errors for relating the satellite data products to similar products from a well-characterized but globally sparse ground-based dataset. In the remote sensing setting, the regression model is used to estimate the global divisor for the satellite data. The error structure of the proposed EIV model comprises two components: A random-error component whose variance is inversely proportional to sample size of underlying individual observations which are aggregated to obtain the regression data, and a systematic-error component whose variance remains the same as the underlying sample size increases. In this article, we discuss parameter identifiability for the proposed model and obtain estimates from two-stage parameter estimation. We illustrate our proposed procedure through both simulation studies and an application to validating measurements of atmospheric column-averaged CO₂ from NASA’s Orbiting Carbon Observatory-2 (OCO-2) satellite. The validation uses coincident target-mode OCO-2 data that are temporally and spatially sparse and ground-based measurements from the Total Carbon Column Observing Network (TCCON) that are spatially sparse but more accurate. Supplementary materials for the article are available online.     

Excel和VB混合编程在直流比较仪式电桥自检数据处理中的应用

本文分析了直流比较仪式电桥自检中结果处理上的不便之处,介绍了一种Excel和VB及Word混合编程来实现直流比较仪式电桥自检数据处理自动化的方法,实现检定结果的自动计算、数据修约和数据规范化,并直接给出数据表.     

Cumulative Damage Models for System Failure With Application to Carbon Fibers and Composites

To estimate the probability distribution of the tensile strength of materials, specimens tested are typically of a variety of sizes, or “gauge lengths.” Here, a cumulative damage argument is used to develop new models for the strength of a general system that incorporate the size as a variable and are strong competitors to the commonly used Weibull model. These strength distributions can be represented as three-parameter versions of the Birnbaum-Saunders distribution and the inverse Gaussian distribution. Estimation is discussed and illustrations are presented for experimental strength data for carbon fibers and small composite specimens.     

A Comparative Study of Several Material Models for Prediction of Hyperelastic Properties: Application to Silicone-Rubber and Soft Tissues

Abstract:  The correct modelling of constitutive laws is of critical importance for the analysis of mechanical behaviour of solids and structures. For example, the understanding of soft tissue mechanics, because of the nonlinear behaviour commonly displayed by the mechanical properties of such materials, makes common place the use of hyperelastic constitutive models. Hyperelastic models however, depend on sets of variables that must be obtained experimentally. In this study the authors use a computational/experimental scheme, for the study of the nonlinear mechanical behaviour of biological soft tissues under uniaxial tension. The material constants for seven different hyperelastic material models are obtained via inverse methods. The use of Martins's model to fit experimental data is presented in this paper for the first time. The search for an optimal value for each set of material parameters is performed by a Levenberg–Marquardt algorithm. As a control measure, the process is fully applied to silicone-rubber samples subjected to uniaxial tension tests. The fitting accuracy of the experimental stress–strain relation to the theoretical one, for both soft tissues and silicone-rubber (typically nonlinear) is evaluated. This study intents also to select which material models (or model types), the authors will employ in future works, for the analysis of human soft biological tissues.     

AMESim与MATLAB\Simulink联合仿真技术及在发动机主动隔振中的应用

介绍了AMESim软件与MATLAB\Simulink的接口技术,并使用AMESim与MATLAB\Simulink对发动机主动隔振进行了联合仿真,分析了主动以及被动隔振的隔振效果,为主动控制提供了新的设计思路。     

用Excel中VB功能实现检定结果的数据修约及应用分析

介绍使用Excel中VB功能实现计量检定结果按照所需要保留小数点后的位数进行正确的数字修约。及实例分析把自编函数和程序应用于玻璃量器、电导率仪、原子荧光光度计等计量检定(校准)结果的数据处理。     

OLE技术在热电偶热电阻自动检定软件中的应用

本文介绍了OLE(目标的链接和嵌入 )技术在热电偶热电阻自动检定系统中的应用 ,实现了在检定程序中调用电子表格Excel,用它的菜单功能整理数据 ,打印输出记录和检定证书     

Generating 3-μm radiation in YAG:Er crystals with resonance excitation of activator ions to a lower laser level

A pulse laser on a phosphate glass activated by Cr³⁺-Yb³⁺-Er³⁺ ions (λ = 1.54 μm) was used to pump Y₂Al₅O₁₂:Er³⁺ (YAG:Er) crystals to the lower laser level of a 3-μm transition (⁴I_11/2 → ⁴I_13/2) in Er³⁺ ions (λ = 2.94 μm). For a pumping pulse energy of E _exc = 200 mJ, the efficiency of 3-μm lasing was 20%. A differential efficiency of the YAG:Er laser in the case of a resonance pumping into the lower laser level amounted to 26%.