A digital-twin visualized architecture for Flexible Manufacturing System

The new generation of industrial 4.0 intelligent manufacturing system consists of Human-Cyber-Physical System (HCPS), integrating human with cyber and physical systems. In manufacturing, a digital-twin visualization architecture is to solve the human-machine interaction problem that concerns digital-twin modeling on the Cyber-Physical (C-P) side and on the Human-Cyber side. Although there are many related research and applications, there lacks attention in terms of full life cycle functional services and lightweight architecture. This paper presents a general architecture of digital-twin visualization for flexible manufacturing systems (FMS). How the digital-twin C-P modeling of multi-source heterogeneous information can be described is investigated and how the 3D visualized human-machine interaction with digital-twin scenario information is explored in the proposed architecture. Besides, the visualization method of high-value information, relating to the life cycle planning, design, debugging and service stages, is studied and discussed thoroughly. Also, a digital-twin modeling concept of "Geometric information (G)-Historical samples (H)-Object attribute (O)-Snapshot collection (S)-Topology constraint (T)" (GHOST) is proposed, and methods for developing virtual digital-twin scenes architecture are presented. Based on the proposed modeling concept of GHOST for digital-twin, prototypes have been developed for the general platform of digital-twin RESTful services and the cross-platform general visual mock-up software. Experimental results show that this method is effective in the FMS lifecycle in various aspects.     

探讨岩土工程勘察中常见技术问题及对策

现代实际工程建设中,岩土工程勘察存在一些技术问题,制约了勘察工作的正常进行和行业的健康发展。论文针对岩土工程勘察工作中几项常见问题的发生原因进行了探讨,并具体提出了应对策略和改进措施。     

基于裂隙描述的膨胀土堑坡稳定性分析

以广西白色强膨胀土为研究对象,利用MATLAB软件编制程序对土体裂隙图片进行二值化处理,获得裂隙率与含水率的线性回归关系。现场试验观测表明,雨季前裂隙长期平均宽度0.005 m,利用等效模型,获得表层土体含水率与裂隙间距的相关关系。按照雨水在裂隙中渗流的过程建立裂隙影响下的雨水入渗计算模型,利用不同裂隙间距,来描述裂隙分布。基于裂隙描述的雨水入渗膨胀土堑坡稳定性计算结果表明,是否考虑裂隙对膨胀土边坡稳定性的计算结果影响较大。当裂隙率较高时边坡持续降雨后安全系数会大幅度降低,同时边坡大气剧烈影响深度的加深也会引起安全系数的迅速降低。根据研究结果,对膨胀土边坡治理提出了具体建议。     

建筑学本科居住建筑设计课程教育的新思考

以居住建筑设计课程为例,提出了传统教学内容和方法存在的问题,通过调整高校教育的建筑学课程安排与教学方法,对小区规划和住宅设计及施工图课程的教学安排与教学方法进行了新思考,最终采用了课程整合,分段分层次教学,点线面比较式教学,新知识点专题研讨的开放式教学,重点强化施工图教学等改革方式。     

细编穿刺织物矩阵刚度优化设计的研究

机织布在穿刺过程中与钢针矩阵之间产生相互作用,该作用使钢针矩阵产生有害变形,并对布层造成损伤.因此,基于钢针矩阵刚度优化设计的原理,建立优化设计的模型、合理地选择钢针矩阵结构参数,可有效控制穿刺过程中钢针矩阵的变形及布层的损伤,为改进细编穿刺工艺和优化织物结构提供了理论依据.     

反吹风玻璃纤维覆膜滤料的研制及应用

通过对膨体过滤布、滤布表面处理技术、ePTFE膜以及覆膜工艺的研究,研制出过滤效率高、运行阻力低的反吹风玻璃纤维覆膜滤料,并对该种滤料的应用进行了实例举证,例证表明反吹风覆膜滤料清灰效果好,使用的反吹风强度较低,大大延长了滤料的使用寿命,降低了产品的运行费用.     

浅析门式钢架结构在池窑拉丝厂中的应用

介绍了门式钢架结构的力学原理和结构组成,分析了门式钢架结构的特点、优势及建筑布置要点,结合具体工程案例重点对门式钢架与网架结构经济性能方案进行了比较和探究,并展望门式钢架结构的发展趋势.     

Comments on “Temperature–heat diagram analysis method for heat recovery physical adsorption refrigeration cycle – Taking multi-stage cycle as an example”

The purpose of this discussion is to increase the awareness of the divergent views on the entransy concept among the readers of International Journal of Refrigeration. Comments are presented in particular on the paper by Xu et al. where the authors used entransy dissipation in their analysis. Based on the view points of various independent groups of researchers worldwide, I draw the attention of readers to the reality that entransy has no physical meaning.     

Design and implementation of a new modified sliding mode controller for grid-connected inverter to controlling the voltage and frequency

As the output power of a microgrid with renewable energy sources should be regulated based on the grid conditions, using robust controllers to share and balance the power in order to regulate the voltage and frequency of microgrid is critical. Therefore a proper control system is necessary for updating the reference signals and determining the proportion of each inverter in the microgrid control. This paper proposes a new adaptive method which is robust while the conditions are changing. This controller is based on a modified sliding mode controller which provides adapting conditions in linear and nonlinear loads. The performance of the proposed method is validated by representing the simulation results and experimental lab results.     

偏航齿轮箱精益装配生产

精益生产方式之一就是要用一切办法来消除、减少一切非增值活动,推行“零返修率”,必须做一个零件合格一个零件,第一次就做好,更重要的是在生产的源头就杜绝不合格零部 件、原材料流入生产后道工序,追求零废品率.作为组装线,也是最容易暴露不良品的一道关键工序.应用精益生产方式在偏航齿轮箱组装生产线进行重新布局与改进,及时有效地解决制约生产的瓶颈问题,同时,把更先进的生产管理模式运用于生产流程中.