Component-based software reliability process simulation considering imperfect debugging

In view of the flaws of component-based software （CBS） reliability modeling and analysis, the low recognition degree of debugging process, too many assumptions and difficulties in obtaining the solution, a CBS reliability simulation process is presented incorporating the imperfect debugging and the limitation of debugging resources. Considering the effect of imperfect debugging on fault detec- tion and correction process, a CBS integration testing model is sketched by multi-queue muhichannel and finite server queuing model （MMFSQM）. Compared with the analytical method based on pa- rameters and other nonparametric approaches, the simulation approach can relax more of the usual reliability modeling assumptions and effectively expound integration testing process of CBS. Then, CBS reliability process simulation procedure is developed accordingly. The proposed simulation ap- proach is validated to be sound and effective by simulation experiment studies and analysis.

Applying Object-oriented Simulation to the Development of FMS Control Software

The approach of control software development based on simulation is discussed. A library of object classes for a flexible manufacturing system(FMS) simulation has been developed using the technology of object-oriented programming. Using the library, the simulation software of a FMS which has the same manufacturing logic with the FMS control system can be easily constructed. A new approach in the development of FMS control software based on software reuse and an emulator of the blade FMS control system for testing control software have also been developed.

Bioinspired mechanically interlocking holey graphene@SiO_(2)anode

Mechanically interlocking structures that can enhance adhesion at the interface and regulate the stress distribution have been widely observed in biological systems.Inspired by the biological structures in the wings of beetles,we synthesized a holey graphene@SiO_(2)anode with strong mechanical interlocking,characterized it electrochemically,and explained its performance by finite element analysis and density functional calculations.The mechanically interlocking structure enhances lithium-ion(Li^(+))storage by transmitting the strain from SiO_(2)to the holey graphene and by a mechano-electrochemical coupling effect.The interlocking fit hinders the abscission of SiO_(2)and the distinctive structure reduces the stress and strain of SiO_(2)during(de)lithiation.The positive mechano-electrochemical coupling effect preserves the amount of electrochemically active phase(LixSi)during cycles and facilitates Li+diffusion.Therefore,the capacity shows only a slight attenuation after 8000 cycles(cycling stability),and the specific capacity is~1200 mA h g^(−1)at 5 A/g(rate-performance).This study furnishes a novel way to design high-performance Li^(+)/Na+/K^(+)/Al3^(+)anodes with large volume expansion.

A Component-Based Debugging Approach for Detecting Structural Inconsistencies in Declarative Equation Based Models

Object-oriented modeling with declarative equation based languages often unconsciously leads to structural inconsistencies. Component-based debugging is a new structural analysis approach that addresses this problem by analyzing the structure of each component in a model to separately locate faulty components. The analysis procedure is performed recursively based on the depth-first rule. It first generates fictitious equations for a component to establish a debugging environment, and then detects structural defects by using graph theoretical approaches to analyzing the structure of the system of equations resulting from the component. The proposed method can automatically locate components that cause the structural inconsistencies, and show the user detailed error messages. This information can be a great help in finding and localizing structural inconsistencies, and in some cases pinpoints them immediately.

Numerical analysis of a double interlocking padded finger seal performance based on thermo-fluid-structure coupling method

Non-contacting finger seals represent an advanced non-contacting and compliant seal in gas turbine sealing technology.This paper proposes a new structure of noncontacting finger seals with double interlocking pads.The numerical analysis model based on the thermo-fluid-structure coupling method for the new type finger seal was established.The influence of working conditions on leakage of the seal was studied and compared with the single padded non-contacting finger seal.The results show that the interface between the bottom of the finger pad and rotor surface is the main leakage path that forms the gas film with obvious variations of pressure and flow velocity.Under high temperature and high pressure operating conditions,the hydrodynamic effect of the gas film is enhanced,and lifting force is significantly improved.The deformation of fingers is composed of elastic deformation and thermal deformation.At room temperature,the deformation of fingers is mainly elastic deformation and points to the center of the rotor,which reduces the gas film clearance.The deformation of fingers at high temperature and high pressure creates a circumferentially convergent gap between the bottom of the pad and the rotor,which is beneficial to improve the loading capacity and to reduce leakage of the seal.Compared with the typical single padded noncontacting finger seal,the double interlocking padded finger seal proposed in this paper reduces the leakage factor by about 37%,which provides an advanced seal concept with the potential to improve sealing performance under high temperature and high pressure working conditions.

Numerical Simulation and Experimental Study on Interlock Deformation for Roll Formed U-Section Steel Piling

The interlock of a roll formed U-section sheet steel piling under loading was analyzed by means of numeri- cal simulation, and meanwhile the tensile failure experiment was conducted. The results indicated that under the same load, the interlock corners of roll formed steel piling are not only the regions with the lowest safety factor, but also the regions with the highest stress; there are two slippages in the tensile instability process of interlock, Each slippage can be regarded as a failure, and different types of failure mode should be used to evaluate the performance of steel pilings according to different applications. Due to the work hardening effect during the roll forming process, the hardness of the interlock material increases by 16% compared with that of the original sheet steel. It was also found that the instability strength obtained in tensile failure test is only 15.6 % of the tensile strength of the original sheet steel.

FactoryIO仿真软件在PLC编程类课程中的应用

PLC应用技术类课程的目的是培养学生独立进行项目编程调试的能力。PLC实验设备的采购、维修成本较高,且设备损耗在所难免。由于设备采购及维修、安装周期的限制,影响课程进度的现象频频出现。FactoryIO三维仿真软件操作简单,可代替实验设备,适用于PLC应用技术类课程的实验教学。由于软件可自行搭建场景,满足了一人一题的教学要求,也适用于PLC课程设计类的教学。该软件也可应用于仿真PLC控制方向的学生的毕业设计调试,配合触摸屏页面的编辑仿真,提高设计的难度及成果的展示性。

基于三维场景的铁路车站列车运行联锁控制仿真研究

联锁控制对铁路车站的调度指挥和列车的有序安全运行起着非常关键的作用。为保证铁路车站联锁控制及列车运行演练的真实性和安全性,提出铁路车站联锁控制及列车运行三维虚拟仿真的总体框架。从铁路车站联锁功能入手,设计车站联锁控制的数据结构、功能逻辑和联锁控制仿真算法,实现了铁路车站联锁的逻辑控制及人机交互仿真。采用面向对象的层次分级法,设计铁路车站设备三维模型的层次结构。通过创建预制体并修改其组件的方式,构建铁路车站列车运行三维虚拟场景模型。结合铁路线路逻辑模型,提出了面向联锁控制的列车运行虚拟寻路算法和列车运动驱动算法,利用该算法进行列车各车辆空间位置和姿态的连续计算,实现了在三维场景下铁路列车的启动,加减速运动,定点停车、换道等功能。在此基础上,在Unity引擎环境下开发了基于三维场景的铁路车站列车运行联锁控制虚拟仿真系统,该系统支持铁路车站联锁控制人机交互仿真,并可在铁路车站三维场景中的不同视角下,以可视化方式观察信号设备状态变化以及列车的动态运行情况。通过给定的站内列车调度计划表,利用所开发的系统进行了铁路车站联锁控制及列车运行三维仿真。仿真实例表明,所采用的方法及技术方案在车站联锁的仿真演练与培训学习方面具有良好的应用前景和实际意义。

土工格栅防护下埋地管道的力学性能及变形分析

为研究荷载作用下路基和管道的破坏机理,建立并验证了三向土工格栅加筋路基中埋置地下管道的三维有限元模型。通过考虑土-土工格栅互锁作用对土工格栅加筋土结构的影响,对土工格栅的几何厚度和孔径进行精确建模,以模拟土工格栅层网孔内颗粒互锁的荷载传递机制,并对于三种土工格栅埋置深度、土工格栅层数和不同加载区域对地下管道的影响进行分析。研究结果显示:土工格栅加筋可以有效减小管道和基础沉降量,随着土工格栅埋置深度增加,管道和基础沉降总体呈下降趋势,土工格栅埋置深度与基础宽度的比值为0.3时管道和基础的沉降最小;随着加筋层数的增加,埋地管道和基础的沉降会显著降低,但降低幅度会随着层数的增加而降低;比较荷载垂直管道加载和平行管道加载的情况,管道管周环向最大应变值一致,但管道底部应变显著减小,同时路基内高应力区朝着加载的偏移方向发生移动;土工格栅层的加入有助于加筋路基形成刚性层,重新分配在此层上传递的应力,分散土体应力分布,降低应力集中现象。

基于数值模拟的混凝土联排水动力特性研究

海上风电桩基础冲刷坑的存在对风电场安全运行造成不利影响,须采用有效的冲刷防护措施稳固桩周泥沙。该文以山东海域某海上风电场为研究对象,提出混凝土联锁排防护措施,并将其简化为六列矩形块阵列模型,通过数值模拟分析了矩形块阵列模型的水动力特性。研究发现,第1排矩形块为整个矩形阵列模型的主要受力块,混凝土联锁排整体阻力可通过单独计算第1排单个矩形块来评估,能显著减少计算量;其次,矩形块阻力系数随时间变化具有周期性,但随时间变化幅度较小。总体而言,本文结果对指导混凝土连锁排防护设计具有一定的工程意义。

DS6-100计算机联锁的IO仿真系统设计与实现

以全新自主研发的DS6-100计算机联锁系统结构为基础,针对DS6-100计算机联锁软件测试中IO模块需求量大、实验室测试条件难以满足的问题,设计并实现了DS6-100计算机联锁的IO仿真系统。详细阐述系统的架构、设计原理及主要功能的设计与实现。实际测试应用结果表明,系统满足联锁软件实验要求,能够扩大实验覆盖程度并提升实验效率。

基于数字孪生技术的数控机床电气设计及样件制造仿真

为解决传统工业物理调试和测试需花费过高成本、安全性较低、系统的稳定性和可靠性较差等问题,基于数字孪生技术即数字化双胞胎技术,根据用户对于生产过程的个性需求,采用西门子CMVM、TIA Portal、SolidWorks、Notepad++等工具软件在环技术,开发相关程序,允许用户自定义界面,对数控机床进行电气调试以及样件的制造仿真验证,提供更加个性化的用户体验,降低生产成本,优化产品生产的工程流程,以提高产品质量。

基于数字仿真的调门油动机虚拟调试研究

随着近年来“中国制造2025”“智慧汽轮机”等新兴研究发展规划的提出,如何提高系统的数字化水平成为了行业的研究热点。利用AMESim搭建高压调门油动机的数字仿真模型,在模型中设置故障模块,利用计算机仿真技术实现了对油动机工作状态的仿真模拟。针对其正常工况与异常工况进行仿真,通过相关参数的调整实现了对油动机不同工况的虚拟调试,模型仿真结果与实验实测数据相对偏差不超过5%,对比结果验证了所建立的模型可以很好地反映油动机多工况下的工作状态与性能。研究成果可为油动机的状态监测与故障识别提供新的研究思路。

压缩机组润滑油系统配置及管理常见缺陷总结探讨

API 614《石油化工和气体工业用润滑、轴密封和控制油系统及辅助设备》系列标准是我国炼化企业配置和管理压缩机组润滑油系统的重要依据,2022年API 614发布了最新版本。总结了近些年来国内炼化企业压缩机组润滑油系统蓄能器、单向阀、安全阀、自力调节阀等关键组件及其配置、安装、管理等方面存在的常见缺陷,结合API 614—2022与API 614—2008讨论了缺陷产生的原因和可行的解决方案。针对静态调试,指出了易忽视的关键点。针对压缩机组的连锁延时设定,分情况给出了建议。

基于55 nm DICE结构的单粒子翻转效应模拟研究

单粒子翻转(single event upset,SEU)是器件在辐照空间中应用的关键难题,本文以55 nm加固锁存单元为研究载体,通过三维数值模拟方法,获得了重离子不同入射条件下的线性能量转移(linear energy transfer,LET)阈值和电压脉冲变化曲线,研究了双互锁存储单元(dual interlockded storage cell,DICE)的抗辐照性能和其在不同入射条件下的SEU效应.研究表明,低LET值的粒子以小倾斜角入射器件时,降低了器件间的总电荷收集量,使得主器件节点的电压峰值和电压脉宽最小,器件SEU敏感性最低;由于空穴与电子迁移率的差异,导致DICE锁存器中Nhit的入射角敏感性远大于Phit;合理调节晶体管间距可以削弱电荷共享效应,使得从器件总电荷收集量减小,仿真计算得到此工艺下晶体管间距不能小于1.2μm.相关仿真结果可为DICE锁存单元单粒子效应的物理机制研究和加固技术提供理论依据和数据支持,有助于加快存储器件在宇航领域的应用步伐.

基于MATLAB的工业机器人运动学建模机理研究

工业机器人在工业自动化使用过程中,其空间位姿可通过示教器获取,但在实际使用中存在空间位姿变换复杂、模型建立困难以及调试过程复杂等问题。本文以IRB1410型机器人为研究对象,从理论上构建机器人的运动学模型,并通过MATLAB软件结合设备检验所建模型的准确性。研究结果显示,这篇论文构建的模型可有效地缩短了机器人调试工艺所需的时间。本模型机理对于机器人开发的理论和实践操作提供了一定的方法思路。

数字孪生仿真与调试实训平台的设计

随着“中国制造2025”的推进,制造业正进行数字化转型。柔性生产线应用广泛,但实际操作常不达预期,影响效率和投资。因此,数字孪生仿真与调试实训平台的设计研究显得尤为重要。数字孪生技术能够构建实体产品的虚拟模型,在虚拟环境中模拟实际生产过程,从而实现对生产线的优化和调整。通过数字化样机虚拟调试降低风险和工作量,推动数字孪生技术发展,促进制造业技术进步和社会经济发展。

计算机联锁试验综合管理系统的分析与应用

计算机联锁系统是列车运行的核心设备,计算机联锁试验直接影响计算机联锁系统的正常运转。为提升当前计算机联锁试验效率,避免人工编写联锁试验记录失败的风险,搭设铁路计算机联锁试验综合管理系统。采用数据分析及计算机技术实现对联锁试验资料的全过程记录,同时构建联锁试验标准化模板作为底板,试验完成后对于联锁数据资料运用数据技术进行分析,对后续联锁试验起到指导作用。

开发工具SWD仿真环境设计

针对如何快速仿真复现芯片SWD接口板级调试问题,本文提出了基于UVM技术的开发工具SWD仿真环境设计。通过对仿真环境的结构设计、组件、目录、文件列表、仿真环境搭建进行详细描述,并对仿真环境的使用方法和项目应用进行说明,展现了SWD仿真环境的功能和设计细节。本仿真环境基于芯片SWD仿真环境进行了二次开发及功能扩展,实现了调试流程功能Task的模块化设计,仿真Case设计简单,有利于SWD板级问题相关调试流程的搭建复现,并提供了丰富的问题定位方法,极大提升SWD接口验证效率。

基于OPC UA和RobotStudio的工业机器人工作站集成仿真

针对工业机器人工作站现场集成调试周期长、效率低的问题,基于OPC UA服务器将RobotStudio平台与西门子虚拟PLC控制器建立通信,搭建搬运码垛工作站集成仿真调试环境。在RobotStudio中设计动态工具的Smart组件,离线规划和编写机器人运动轨迹和程序;使用TIA软件编写工作站逻辑程序并下载至虚拟控制器;通过OPC UA建立连接,再利用RobotStudio完成工作站逻辑设计、调试和运动节拍优化。结果表明:该仿真能够有效验证工业机器人运动轨迹和PLC逻辑程序控制的合理性和准确性;调试机器人TCP与外围设备的速度能优化工作站的运动节拍,缩短了工作站现场集成调试周期。为降低工作站集成成本和提高生产效率提供理论依据。