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Group-based multiple pipe routing method for aero-engine focusing on parallel layout
《机械工程前沿(英文)》 2021年 第16卷 第4期 页码 798-813 doi: 10.1007/s11465-021-0645-3
关键词: multiple pipe routing optimization algorithm aero-engine pipe grouping parallel layout
Branch-pipe-routing approach for ships using improved genetic algorithm
Haiteng SUI,Wentie NIU
《机械工程前沿(英文)》 2016年 第11卷 第3期 页码 316-323 doi: 10.1007/s11465-016-0384-z
Branch-pipe routing plays fundamental and critical roles in ship-pipe design. The branch-pipe-routing problem is a complex combinatorial optimization problem and is thus difficult to solve when depending only on human experts. A modified genetic-algorithm-based approach is proposed in this paper to solve this problem. The simplified layout space is first divided into three-dimensional (3D) grids to build its mathematical model. Branch pipes in layout space are regarded as a combination of several two-point pipes, and the pipe route between two connection points is generated using an improved maze algorithm. The coding of branch pipes is then defined, and the genetic operators are devised, especially the complete crossover strategy that greatly accelerates the convergence speed. Finally, simulation tests demonstrate the performance of proposed method.
关键词: branch pipe ship industry piping system optimization algorithm
Major applications of heat pipe and its advances coupled with sorption system: a review
Yang YU, Guoliang AN, Liwei WANG
《能源前沿(英文)》 2019年 第13卷 第1期 页码 172-184 doi: 10.1007/s11708-019-0610-6
关键词: heat pipe sorption system heat transfer solid sorption heat pipe
Enhanced solution representations for vehicle routing problems with split deliveries
《工程管理前沿(英文)》 页码 483-498 doi: 10.1007/s42524-023-0259-z
关键词: vehicle routing multidepot time windows tabu search split delivery
李炜
《中国工程科学》 2002年 第4卷 第1期 页码 82-88
概述了组播路由协议。分析了协议独立的组播路由一稀疏模式(PIM-SM)的缺陷,提出多个会聚 点(RPs)的PIM-SM的改进机制。多个RPs机制有效地提高了原有单个RP的PIM-SM协议的健壮性,有利 于实现负载均衡、分类业务及提高系统的容错性能,并讨论多个RPs机制的开销问题。分析了 PIM-SM实现细 节和组播技术的前景。
Design and analyses of open-ended pipe piles in cohesionless soils
Yuan GUO,Xiong (Bill) YU
《结构与土木工程前沿(英文)》 2016年 第10卷 第1期 页码 22-29 doi: 10.1007/s11709-016-0314-5
A review on the electric vehicle routing problems: Variants and algorithms
Hu QIN , Xinxin SU, Teng REN, Zhixing LUO
《工程管理前沿(英文)》 2021年 第8卷 第3期 页码 370-389 doi: 10.1007/s42524-021-0157-1
关键词: electric vehicles routing recharging stations exact algorithms metaheuristics
A review of nondestructive examination technology for polyethylene pipe in nuclear power plant
Jinyang ZHENG, Yue ZHANG, Dongsheng HOU, Yinkang QIN, Weican GUO, Chuck ZHANG, Jianfeng SHI
《机械工程前沿(英文)》 2018年 第13卷 第4期 页码 535-545 doi: 10.1007/s11465-018-0515-9
Polyethylene (PE) pipe, particularly high-density polyethylene (HDPE) pipe, has been successfully utilized to transport cooling water for both non-safety- and safety-related applications in nuclear power plant (NPP). Though ASME Code Case N755, which is the first code case related to NPP HDPE pipe, requires a thorough nondestructive examination (NDE) of HDPE joints. However, no executable regulations presently exist because of the lack of a feasible NDE technique for HDPE pipe in NPP. This work presents a review of current developments in NDE technology for both HDPE pipe in NPP with a diameter of less than 400 mm and that of a larger size. For the former category, phased array ultrasonic technique is proven effective for inspecting typical defects in HDPE pipe, and is thus used in Chinese national standards GB/T 29460 and GB/T 29461. A defect-recognition technique is developed based on pattern recognition, and a safety assessment principle is summa-rized from the database of destructive testing. On the other hand, recent research and practical studies reveal that in current ultrasonic-inspection technology, the absence of effective ultrasonic inspection for large size was lack of consideration of the viscoelasticity effect of PE on acoustic wave propagation in current ultrasonic inspection techno-logy. Furthermore, main technical problems were analyzed in the paper to achieve an effective ultrasonic test method in accordance to the safety and efficiency requirements of related regulations and standards. Finally, the development trend and challenges of NDE test technology for HDPE in NPP are discussed.
关键词: polyethylene pipe nuclear power plant ultrasonic inspection nondestructive testing safety assessment
Calculation method of load distribution on pipe threaded connections under tension load
Shoujun CHEN, Lianxin GAO, Qi AN
《机械工程前沿(英文)》 2011年 第6卷 第2期 页码 241-248 doi: 10.1007/s11465-011-0219-x
This paper presents a new calculation method that can calculate the load distribution on pipe threaded connections under tension load. On the basis of elastic mechanics, the new method was developed by analyzing each thread tooth, and a new deformation and covariant equation by making a mechanics analysis on each thread tooth was obtained. Compared with the traditional method proposed by the previous references, the new deformation and covariant equation could be used to describe the relation between the previous and the next thread tooth. By applying the new method on the sample of P-110S pipe threaded connection, the obtained results show that the load on thread tooth mainly concentrates on the four or five threads engaged and the middle teeth were not utilized well to bear the loads. The model offers a new way to calculate the loads carried on the thread teeth under tension load.
关键词: load distribution calculation method pipe threaded connections tension load
NC flame pipe cutting machine tool based on open architecture CNC system
Xiaogen NIE, Yanbing LIU
《机械工程前沿(英文)》 2009年 第4卷 第2期 页码 147-152 doi: 10.1007/s11465-009-0025-x
关键词: flame pipe cutting flame incision tracks CNC open architecture CNC system
Assessment of glass fiber-reinforced polyester pipe powder in soil improvement
《结构与土木工程前沿(英文)》 2021年 第15卷 第3期 页码 742-753 doi: 10.1007/s11709-021-0732-x
关键词: shallow foundation sandy soil bearing capacity soil improvement pipe powder
Dynamic prediction of moving trajectory in pipe jacking: GRU-based deep learning framework
《结构与土木工程前沿(英文)》 页码 994-1010 doi: 10.1007/s11709-023-0942-5
关键词: dynamic prediction moving trajectory pipe jacking GRU deep learning
刘亚林
《中国工程科学》 2002年 第4卷 第7期 页码 60-68
给出了动态快速路由查找算法(DFR)的原理和实现。该算法采用特殊的数据结构来构建索引表,能支持动态插入、删除和更新路由;DFR算法最多4次访存,最少2次访存,就能找到完整的路由信息。该算法不仅适用于软件实现,而且由于查找简单,也适合于硬件实现。
Fictitious soil pile model for dynamic analysis of pipe piles under high-strain conditions
《结构与土木工程前沿(英文)》 页码 915-934 doi: 10.1007/s11709-023-0907-8
关键词: fictitious soil pile soil plug pipe piles high-strain dynamic analysis one-dimensional wave theory pile dynamics
Diagnosis of sewer pipe defects on image recognition of multi-features and support vector machine in
Xiangyang Ye, Jian’e Zuo, Ruohan Li, Yajiao Wang, Lili Gan, Zhonghan Yu, Xiaoqing Hu
《环境科学与工程前沿(英文)》 2019年 第13卷 第2期 doi: 10.1007/s11783-019-1102-y
An image-recognition-based diagnosis system of pipe defect types was established. 1043 practical pipe images were gathered by CCTV robot in a southern Chinese city. The overall accuracy of the system is 84% and the highest accuracy is 99.3%. The accuracy shows positive correlation to the number of training samples.
关键词: Sewer pipe defects Defect diagnosing Image recognition Multi-features extraction Support vector machine
标题 作者 时间 类型 操作
Major applications of heat pipe and its advances coupled with sorption system: a review
Yang YU, Guoliang AN, Liwei WANG
期刊论文
A review on the electric vehicle routing problems: Variants and algorithms
Hu QIN , Xinxin SU, Teng REN, Zhixing LUO
期刊论文
A review of nondestructive examination technology for polyethylene pipe in nuclear power plant
Jinyang ZHENG, Yue ZHANG, Dongsheng HOU, Yinkang QIN, Weican GUO, Chuck ZHANG, Jianfeng SHI
期刊论文
Calculation method of load distribution on pipe threaded connections under tension load
Shoujun CHEN, Lianxin GAO, Qi AN
期刊论文
NC flame pipe cutting machine tool based on open architecture CNC system
Xiaogen NIE, Yanbing LIU
期刊论文