A bidirectional ribbed concrete beam slab structure was widly adopted for the upper space of industrial buildings.To maintain ample space and minimize the presence of conventional columns,a bidirectional prestressed c...A bidirectional ribbed concrete beam slab structure was widly adopted for the upper space of industrial buildings.To maintain ample space and minimize the presence of conventional columns,a bidirectional prestressed concrete beam is often employed.The intersection node of the prestressed concrete frame beam column was characterized by a high density of steel reinforcement,significant structural loads,and complex construction requirements.To ensure the quality,safety,and progress of prestressed frame beamcolumn intersection nodes during construction,this article proposed a new technology for constructing such nodes,which includes setting the tensioning and haunching ends of nodes at different positions,using ABAQUS finite element software to optimize the design of cross-sectional dimensions,conducting stress analysis simulations.展开更多
Based on the analysis of characteristic of cable harness planning in virtual environment,a discrete control node modeling (DCNM) method of cable harness in virtual environment and the cable harness assembly routing te...Based on the analysis of characteristic of cable harness planning in virtual environment,a discrete control node modeling (DCNM) method of cable harness in virtual environment and the cable harness assembly routing technique based on it are proposed. DCNM converts a cable harness into continuous flexed line segments connected by a series of section center points,and the design can realize cable harness planning through controlling those control nodes. This method of cable harness routing in the virtual environment breaks the status that virtual assembly process planning is just suitable for the rigid components at present,and impulse the virtual assembly process planning to be more practical. Relation algorithms have been verified in a self-developed system named virtual cable harness assembly planning (VCHAP) system,and this VCHAP system has been applied in assembly process planning of aerospace-related products.展开更多
装配式建筑因施工周期短、节约资源等优点得到了广泛应用,其框架节点是结构受力的主要部位。为剖析装配式建筑框架节点关键技术与发展趋势,通过利用软件CITESPACE对中国知网收录的有关装配式建筑框架节点的核心期刊169篇文献和Web of Sc...装配式建筑因施工周期短、节约资源等优点得到了广泛应用,其框架节点是结构受力的主要部位。为剖析装配式建筑框架节点关键技术与发展趋势,通过利用软件CITESPACE对中国知网收录的有关装配式建筑框架节点的核心期刊169篇文献和Web of Science核心合集的456篇文献进行发文量分析,文献所属研究机构以及关键词共现分析等进行对比。结果发现:装配式建筑框架节点的研究发文量总体呈上升趋势,美国中心性最强,法国位居第二,同济大学和东南大学在此领域的研究较多;国内外对所属装配式节点各领域之间的研究较为紧密,研究框架逐渐完整,其中抗震性能、耗能能力是装配式建筑框架节点研究的重要内容,部分包覆钢-混凝土组合结构(partially encased composite structure of steel and concrete,PEC)结构和自复位结构是其研究的新内容;数值模拟方法在众多研究中都被应用,其与试验方法的结合是当下装配式建筑框架节点研究的热点。在总结装配式建筑框架节点优缺点的基础上,提出了存在的问题并进行探讨。展开更多
针对机械式穴播器装配线上在制品(Work In Process,WIP)主要依靠管理人员经验进行定性控制的问题,采用多点控制的方法对装配线上在制品进行定量优化。首先运用约束理论(Theory Of Constraint,TOC)结合推、拉两种生产方式对装配线进行分...针对机械式穴播器装配线上在制品(Work In Process,WIP)主要依靠管理人员经验进行定性控制的问题,采用多点控制的方法对装配线上在制品进行定量优化。首先运用约束理论(Theory Of Constraint,TOC)结合推、拉两种生产方式对装配线进行分段研究,在分段节点设立瓶颈缓冲区、并联缓冲区和风险缓冲区;然后根据工位故障持续时间与物料消耗速度计算出缓冲区最优容量,得出机械式穴播器装配线在制品多点控制优化方案。通过对某企业机械式穴播器装配系统进行Flex Sim仿真,验证了方案的可行性。展开更多
基金Funded by the Nantong Science and Technology Plan Project(No.JC2021172)the Cyan and Blue Project of Universities in Jiangsu Province。
文摘A bidirectional ribbed concrete beam slab structure was widly adopted for the upper space of industrial buildings.To maintain ample space and minimize the presence of conventional columns,a bidirectional prestressed concrete beam is often employed.The intersection node of the prestressed concrete frame beam column was characterized by a high density of steel reinforcement,significant structural loads,and complex construction requirements.To ensure the quality,safety,and progress of prestressed frame beamcolumn intersection nodes during construction,this article proposed a new technology for constructing such nodes,which includes setting the tensioning and haunching ends of nodes at different positions,using ABAQUS finite element software to optimize the design of cross-sectional dimensions,conducting stress analysis simulations.
基金Sponsored by the National Natural Science Foundation,China(No.50475162)
文摘Based on the analysis of characteristic of cable harness planning in virtual environment,a discrete control node modeling (DCNM) method of cable harness in virtual environment and the cable harness assembly routing technique based on it are proposed. DCNM converts a cable harness into continuous flexed line segments connected by a series of section center points,and the design can realize cable harness planning through controlling those control nodes. This method of cable harness routing in the virtual environment breaks the status that virtual assembly process planning is just suitable for the rigid components at present,and impulse the virtual assembly process planning to be more practical. Relation algorithms have been verified in a self-developed system named virtual cable harness assembly planning (VCHAP) system,and this VCHAP system has been applied in assembly process planning of aerospace-related products.
文摘装配式建筑因施工周期短、节约资源等优点得到了广泛应用,其框架节点是结构受力的主要部位。为剖析装配式建筑框架节点关键技术与发展趋势,通过利用软件CITESPACE对中国知网收录的有关装配式建筑框架节点的核心期刊169篇文献和Web of Science核心合集的456篇文献进行发文量分析,文献所属研究机构以及关键词共现分析等进行对比。结果发现:装配式建筑框架节点的研究发文量总体呈上升趋势,美国中心性最强,法国位居第二,同济大学和东南大学在此领域的研究较多;国内外对所属装配式节点各领域之间的研究较为紧密,研究框架逐渐完整,其中抗震性能、耗能能力是装配式建筑框架节点研究的重要内容,部分包覆钢-混凝土组合结构(partially encased composite structure of steel and concrete,PEC)结构和自复位结构是其研究的新内容;数值模拟方法在众多研究中都被应用,其与试验方法的结合是当下装配式建筑框架节点研究的热点。在总结装配式建筑框架节点优缺点的基础上,提出了存在的问题并进行探讨。
文摘针对机械式穴播器装配线上在制品(Work In Process,WIP)主要依靠管理人员经验进行定性控制的问题,采用多点控制的方法对装配线上在制品进行定量优化。首先运用约束理论(Theory Of Constraint,TOC)结合推、拉两种生产方式对装配线进行分段研究,在分段节点设立瓶颈缓冲区、并联缓冲区和风险缓冲区;然后根据工位故障持续时间与物料消耗速度计算出缓冲区最优容量,得出机械式穴播器装配线在制品多点控制优化方案。通过对某企业机械式穴播器装配系统进行Flex Sim仿真,验证了方案的可行性。