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Material Science and Engineering
Discussion on some problems of small face impact bonding effect
WU Qichang, HE Jianping
2021, 35(4): 295-304.  
Abstract:
Impact bonding has attracted much attention due to its excellent performance. In order to understand impact bonding effect with small face, the interface morphology by impact welding was investigated, the affecting of interface morphology on mechanical properties of welds was discussed, and it is indicated that the wavy interface is important for a reliable weld. In addition, based on bonding process of impact welding workpiece with large face, the formation mechanism of wavy interface was further analyzed. On this basis, the formation mechanism of wavy interface produced for impact welding workpiece with small face was discussed. It is indicated that an artificially set collision angle is necessary to form a wavy interface. Moreover, it is proposed that the effective method to solve the asymmetric problem occurred in impact welding workpiece with small face is to change the bonding surface of flying plate with conical bonding face.
[Abstract](17) [FullText HTML](19) [PDF 1214KB](92)
Progress in research methods of microstructure evolution during welding solidification
JIN Shuode, HE Jianping, PAN Xuehang
2021, 35(4): 305-314.  
Abstract:
The final microstructure of welding joint is affected by microstructure evolution during welding solidification, and then it affects mechanical properties of welding joint. Experimental-based analysis methods such as Gleeble thermal simulation experimental method, comparisons of microstructures in different areas for welding joint on microstructure evolution analysis method, microstructure evolution analysis method based on chemical composition changed, in-situ observation of synchrotron radiation were discussed. And then, theoretical-based methods of microstructure evolution during welding solidification such as phase field method, cellular automata method, Monte Carlo method were analyzed, and it obtains that these seven methods which are analyzed microstructure evolution during welding solidification have their own advantages and disadvantages.
[Abstract](18) [FullText HTML](18) [PDF 997KB](23)
Multi-objective optimization of process parameters of 45 steel laser cladding Ni60 alloy powder
JI Youdi, GONG Hongying, XU Peiquan
2021, 35(4): 315-320.  
Abstract:
In order to extend the service life of the parts and reduce the production costs, the laser cladding of the Ni60 molten coating layer on the 45 steel surface can meet the production requirements, avoid the waste of resources and achieve green manufacturing. The weights were determined by analytic hierarchy process and a three-level, three-factor orthogonal test was established to analyze the macro and micro morphologies, friction wear characteristics and micro hardness of the molten coating layer. The results show that the optimized process parameters are laser power of 3 kW, a scanning speed of 12 mm/s and overlap rate of 45%. The suitable process parameters can refine the tissue grain and avoid the generation of cracks and pores. The coating obtained by optimizing the process parameters has better wear resistance, lower friction coefficient, less wear weight loss than the base, the wear mechanism is abrasive wear and the hardness is three times that of the base.
[Abstract](16) [FullText HTML](21) [PDF 1336KB](19)
Advanced Manufacturing and Intelligent Control
Research on sensorless control strategy of PMSM
HE Zheng, MA Xipei, FAN Pingqing, ZHAO Heng, WANG Yansong
2021, 35(4): 321-326.  
Abstract:
Aiming at the problems of overshoot, chattering and slow response in the sensorless control system of permanent magnet synchronous motor (PMSM) for electronic water pump, PMSM sensorless control algorithm based on hybrid sliding mode speed controller and Luenberger observer was proposed. In the speed loop, a sliding mode speed controller based on the new reaching law was designed. On the basis of the traditional exponential reaching law, the motion error of the moving point was introduced into the constant velocity term, and the hyperbolic tangent function was adopted to replace the comparison switching function, so as to improve the convergence speed and chattering suppression ability of the sliding mode. The Luenberger observer of the linear control structure combined with the phase-locked loop was applied to the sensorless control system, in order to improve the chattering problem and stability of the estimated speed. The simulation results show that under the no-load starting and external disturbance conditions of the motor, the algorithm can effectively improve the speed tracking effect of PMSM sensorless control system, improve the speed overshoot and chattering problems, and enhance the anti-interference ability of the system.
[Abstract](18) [FullText HTML](17) [PDF 1466KB](21)
Fractional-order sliding mode control of robotic arms with boundary layer
LIU Shijie, HUANG Zhilai, YANG Mingxing, XU Peimin
2021, 35(4): 327-332.  
Abstract:
For the robotic arm system with perturbation, the fractional-order calculus was introduced to construct a fractional-order sliding mode surface based on classical sliding mode control. While a boundary layer had set in the reaching law, and the sign function was replaced with the saturation function to weaken chattering phenomenon of the sliding mode surface to obtain a fractional-order sliding mode control of robotic arms with boundary layer, and its convergence had proved by the direct method of Lyapunov. Example with a two-degree-of-freedom robotic arm system as the controlled object, the simulation result shows that the fractional-order sliding mode control of robotic arms with boundary layer can achieve better convergence and accurate trajectory tracking by adjusting the differential order compared with the classical sliding mode control.
[Abstract](14) [FullText HTML](12) [PDF 948KB](17)
Study on relaxation rule of over temperature creep stress in superheater tube of ultra-supercritical boiler
LIN Qidie, YAN Zhenrong, WANG Huanan, CHEN Le, WEI Jingtao
2021, 35(4): 333-339.  
Abstract:
The superheater tube in the outlet area of the high-temperature superheater box of ultra-supercritical boiler is easy to be exposed to overtemperature environment, resulting in creep stress relaxation and material failure. Based on Norton creep model, the stress relaxation behavior and creep distribution of T91 superheater tube wall during long-term thermal induction were simulated under the operating conditions of flue gas temperature of 750℃, steam temperature of 600℃ and steam pressure of 26 MPa. The simulation results show that stress relaxation phenomenon of the heat pipe firstly occurs on the inner wall and spreads along the radial direction with time accumulation. After 10000 h, the inner wall surface appears stress relaxation and relaxation accelerates. At the same time, high temperature creep behavior also occurs on the tube wall during the stress relaxation process, and the creep behavior firstly appears on the inner wall and spreads along the radial direction, and the creep degree of the inner wall is higher than that of the outer wall. After 10000 h, the thickness of pipe wall begins to decrease. The results show that the overtemperature operation of superheater tube of ultra-supercritical boiler for 10000 h is the time point from creep stress relaxation to creep damage.
[Abstract](75) [FullText HTML](15) [PDF 1896KB](14)
Numerical simulation and test analysis of magnetic field in 500 kA aluminum electrolyzer
LI Shangwei, DENG Shengxiang, KUANG Jianghong
2021, 35(4): 340-345.  
Abstract:
Using 3D modeling of SolidWorks and 3D simulation software of COMSOL, the numerical simulation of 500 kA aluminum electrolyzer was carried out. A magnetic field test on 500 kA aluminum electrolyzer of a manufacturer is carried, and the test results are in good agreement with the simulation results. The magnetic field distribution of 500 kA aluminum electrolyzer was obtained and optimized, the influences of the column bus bar and groove bus bar on the molten aluminum layer are reduced by increasing the distance between the column bus bar and aluminum electrolyzer as well as the distance between the groove bus bar and aluminum electrolyzer. After the optimization, the magnetic field distribution of the molten aluminum layer tends to be uniform and stable along the Z-axis direction. The simulation and test provide technical support for improving the technical conditions of production process.
[Abstract](17) [FullText HTML](14) [PDF 1101KB](21)
Modern Traffic Engineering
Research progress on detection technology of large-size aircraft parts
LI Binpeng, MAO Jian
2021, 35(4): 346-353.  
Abstract:
Large-size aircraft parts have complex structure and huge external dimension characteristics. In view of the research of large-size measurement technology in the aircraft manufacturing process, five kinds of detection technology methods for large-size parts, like three-coordinate measurement method, LIDAR measurement method, indoor GPS measurement method, laser tracker measurement method and machine vision measurement method were proposed. The applicable fields and respective advantages and short-comings of five detection methods were analyzed. The visual measurement which can achieve real-time measurement has non-contact, high precision and efficiency characteristics. It has a great prospect in the field of aviation measurement. It was pointed out that vision measurement technology is research direction in large-size measurement. A series of issues such as the theoretical models establishment, detection parameters optimization and real-time feedback need to be further studied in the future.
[Abstract](15) [FullText HTML](16) [PDF 1011KB](21)
Research status of GIS application in highway engineering field based on knowledge graph
TIAN Xueze
2021, 35(4): 354-361.  
Abstract:
In order to gain insight into current status and hotspots of geographic information system (GIS) application research in the field of highway engineering in our country, relevant documents in the CNKI database from 2010 to 2020 were used as data sources, and softwares such as COOC, GIGO, SPSS and UCINET were used comprehensively. The research topics of high-frequency keywords in the field were classified through clustering tree diagram analysis, factor analysis and multi-dimensional scale analysis; the social network analysis method was used to draw the co-occurrence network map and centrality analysis of the key words to reveal its research hotspots and structure intuitively. The results show that the hot keywords of GIS research are route design, slope geological hazard susceptibility evaluation, landslide monitoring, pavement management system and so on. Research topics can be divided into three main categories namely: GIS diversification research and application, road transportation network and geological disaster evaluation, road management information and visualization.
[Abstract](20) [FullText HTML](15) [PDF 1001KB](23)
Fuzzy comprehensive evaluation of civil aircraft operational requirement based on AHP-entropy method
CHU Shuanglei, WEI Zhiqiang, REN Qiang, LIU Fei
2021, 35(4): 362-369.  
Abstract:
At present, the evaluation index for the demonstration program of civil aircraft operation requirement is not comprehensive and complete, and it is difficult to identify key indicators that affect the quality and competitiveness of civil aircraft products. On the basis of analyzing the operational environment and operational mission of civil aircraft, an index system of operational requirements for civil aircraft was established from six dimensions of aircraft adaptability, aircraft usability, equipment matching, maintenance rationality, aircraft advancement and dispatch reliability. The subjective weight and objective weight of the index were considered by the AHP-entropy method. The weight of each index was obtained, the membership degree of the index was determined by fuzzy set method, and fuzzy comprehensive evaluation matrix was constructed. A model for fuzzy evaluating the operational requirements of civil aircraft was proposed, an example of B737−800 was used to verify the rationality and feasibility of the evaluation model. The result shows that the model can reflect technical indicators of civil aircraft operation requirements and realize comprehensive evaluation of operational needs of civil aircraft.
[Abstract](17) [FullText HTML](17) [PDF 715KB](24)
Textile Chemical Engineering and Environment
Study on preparation and anti-UV properties of TiO2 film on terylene
CHENG Ya, CHEN Zhuoming, ZHENG Yuansheng, XIN Binjie
2021, 35(4): 370-376.  
Abstract:
Titanium dioxide/polyester (TiO2/PET) ultraviolet (UV) resistant fabric was prepared by deposition of titanium dioxide on the surface of polyester fabric by magnetron sputtering. The effects of magnetron sputtering time and sputtering power on the UV resistance of the fabric during the preparation process were investigated. The UV absorption and shielding mechanism of TiO2 thin films were analyzed, and the thermal insulation and thermal stability of the fabric were also detected. The results show that TiO2 film deposited on the surface of PET can improve the UV resistance of the fabric, which is attributed to the good UV absorption capacity of TiO2 film and the effective shielding ability of UV visible light. In addition, the roughness of TiO2 film increases and the thickness decreases when the sputtering power is greater than 150 W, so when the sputtering power is 150 W and the sputtering time is 90 min, TiO2/PET fabric has the strongest UV resistance, and its UV protection coefficient (UPF) is 1211.19. Simultaneously, the deposition of TiO2 thin film endows the PET fabric with good thermal stability and heat insulation performance.
[Abstract](14) [FullText HTML](93) [PDF 2298KB](25)
Mechanism of a drug pair of Astragalus membranaceus and Lycium barbarum on ulcerative colitis based on network pharmacology
HAO Fangjia, PENG Yuanyuan, ZHAO Linjing
2021, 35(4): 377-382.  
Abstract:
The drug pair comprising of Astragalus membranaceus and Lycium barbarum (AL) has the clinical efficacy to prevent ulcerative colitis (UC). However, the mechanism of action is still arcane. The possible mechanism of this drug pair in the treatment of UC was investigated using a network pharmacology platform. The components and putative targets of AL were collected based on integrative pharmacology-based research platform of traditional Chinese medicine, String database, and David database. By analyzing the protein-protein interactive network containing the targets of AL and potential therapeutic targets of UC, GO and KEGG pathway enrichment analyses were performed, and a regulating network of herb-constituent-target-pathway was constructed. The results suggested that AL may play a beneficial role in UC through affecting the expression of targets associated with immune and inflammation such as PTGS2, and regulation of nuclear transcription factor-κВ signaling pathway, TNF signaling pathway, etc. The results of the study provide a reference for the systematic elucidation of the mechanism of AL in the treatment of UC.
[Abstract](20) [FullText HTML](15) [PDF 850KB](18)
Research status and existing problems of intelligent wearable clothing for the elderly
ZHANG Yifei, KE Baozhu
2021, 35(4): 383-388.  
Abstract:
With the increasing demand for functional clothing and the accelerating aging of the population, developments of intelligent wearable clothing for the elderly need to be paid attention to. The researches of intelligent wearable clothing for the elderly were summarized, it was pointed out that it mainly involves four aspects: physiological data monitoring for elderly with chronic diseases, physiotherapy and maintenance of elderly with frequent diseases, safety protection such as fall prevention and warning, and auxiliary entertainment for elderly psychological needs. The existing problems, difficulties and future development trend of intelligent wearable clothing for the elderly were summarized, and existing problems like how to pursue the innovation of intelligent technology while ensuring the wearing experience effect, as well as the difficulties like how to mass produce and reduce the price of intelligent wearable clothing for the elderly were concluded. Then it put forword the future in terms of design, process, manufacturing, and marketing operations.
[Abstract](15) [FullText HTML](18) [PDF 2466KB](16)
Mathematical Sciences and Application
Establishment of differential equation of in-plane free vibration of curved beams under MOI and shear deformation
ZHANG Zhichao, SONG Yumin
2021, 35(4): 389-394.  
Abstract:
The derivation and establishment of vibration differential equation are the key to the structural dynamic analysis. The moment of inertia (MOI) and shear deformation were taken into account, the differential equations of in-plane free vibration about lateral bending and axial deformation of curved beams were derived and established by combining geometric equations and the internal force equilibrium according to the theory of Timoshenko beam. The research results can provide a theoretical basis for dynamic study on the curved beams.
[Abstract](15) [FullText HTML](16) [PDF 781KB](16)
Objective Bayesian analysis of mixture cure model based on exponential distribution
XIAO Xiang, WU Yiqi, GU Xi
2021, 35(4): 395-400.  
Abstract:
A mixture cure model based on exponential distribution was proposed. By using full likelihood function and latent variables, it was easy to calculate Fisher information matrix, drive Jeffreys prior and reference priors, and the appropriateness of posterior distribution was verified. The results show that the objective Bayesian method has a good effect on parameter estimation, especially when the sample size is small.
[Abstract](14) [FullText HTML](12) [PDF 734KB](9)
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Research State and Progress of Textile Printing and Dyeing Wastewater Treatment Technologies
LIU Lu
2017, 31(2): 174-177,182.   doi: 10.3969/j.issn.1009-444X.2017.02.016
[Abstract](16) [PDF 324KB](363)
摘要:
随着纺织印染行业的不断发展,纺织印染废水成分也日益复杂,大大增加了废水处理难度.针对纺织印染废水的来源和水质特点,综述了国内外纺织印染废水处理技术的研究进展,包括物理处理法、化学处理法和生物处理法,分析了各类处理方法的机制、处理效果及其优缺点.对纺织印染废水处理技术的发展前景进行了展望,指出优化组合废水处理工艺可提高纺织印染废水处理效果及综合回用率.
Optimization Method for Gross Error Processing of Traffic Data Based on Pauta Criterion
XU Chenhui, MA Minghui
2018, 32(1): 64-67.   doi: 10.3969/j.issn.1009-444X.2018.01.014
[Abstract](18) [PDF 2135KB](162)
摘要:
交通数据质量是影响交通控制方法有效实施的关键因素之一.为进一步提升交通数据的准确性和时效性,对比分析交通预处理方法,采用标准差公式对拉依达准则进行优化,设计一种适用于交通异常数据检测和修复的优化方法,并结合上海城市快速路实际数据对模型有效性和时效性进行检验.结果表明,基于拉依达准则的数据处理优化方法能够有效、实时地检测交通异常数据、改善数据质量,为道路交通状况的监测和预警提供数据支持.
Survey on Social Participation Willingness of Urban Elderly in Perspective of Active Aging
WANG Shu
2017, 31(4): 371-375.   doi: 10.3969/j.issn.1009-444X.2017.04.017
[Abstract](16) [PDF 289KB](158)
摘要:
老年人参与各项社会活动,能够延缓衰老,促进身体健康、提高生活质量.通过开展调研探究了老年人的社会参与意愿及其影响因素.调查发现,城市老年人对经济、政治、社区、文化等各项活动的参与意愿都较高,但是多数的参与停留在被动层面;年龄、性别、文化程度、健康状况等因素会影响参与意愿,且不同活动受影响的程度不同;参与意愿会受到现实条件的约束,如照看小孩,料理家务等.
Promoting Effective Dissemination of Journal Articles Using Precision Push Platform
ZENG Xianrong
2017, 31(2): 126-130.   doi: 10.3969/j.issn.1009-444X.2017.02.007
[Abstract](38) [PDF 2121KB](214)
摘要:
为满足读者的个性化需求,为其提供内容精准推送服务,有效提升期刊论文的传播与交流,设计了《计算机工程》内容精准推送系统.基于期刊采编系统的大量学者信息,利用语义分析及智能分词等技术,将读者—文章—标准关键词库进行匹配和过滤,为潜在读者主动推送相关论文摘要及下载链接.每期推送邮件约7 000封,发送成功率达99%,论文被下载次数较未运行该系统前明显增多,其中下载排名前列的均为已推送论文.科技期刊采用精准推送平台不仅可以为领域学者提供高效便捷的知识服务,也能够增强期刊论文的有效传播力度.
Research and Development of Modern Functional Textiles
XU Lihui, SHEN Yong, WANG Liming, DING Ying
2018, 32(3): 214-220.   doi: 10.3969/j.issn.1009-444X.2018.03.004
[Abstract](31) [PDF 2357KB](66)
摘要:
介绍功能纺织品的分类,分析功能纺织品的开发途径,主要阐述国内现代功能纺织品研究及开发进展,包括纳米光触媒多功能纺织品、防电磁辐射纺织品、超疏水多功能纺织品、阻燃纺织品、防蚊虫纺织品,并指出采用高新技术开发生态安全高附加值多功能纺织品是功能性纺织品的发展趋势.
Numerical Simulation Analysis on Air Distribution of Inter-Column Air Conditioning in a Machine Room
LI Pengkui, FU Yunzhun
2018, 32(3): 244-249.   doi: 10.3969/j.issn.1009-444X.2018.03.009
[Abstract](27) [PDF 2243KB](83)
摘要:
以上海某数据中心机房为研究对象,针对机房服务器散热量大的特点及传统封闭冷通道存在的问题,提出适合该机房的封闭热通道方案.采用计算流体动力学(CFD)模拟的方法,分析机房内封闭热通道与传统封闭冷通道的温度场和速度场分布特性.通过模拟分析得出:大散热量机房列间空调采用封闭热通道形式效果更佳.
Analysis on Wireless TWC and Abnormal Communication for CBTC System of Shanghai Rail Transit
TAO Xiaojing
2017, 31(2): 149-153.   doi: 10.3969/j.issn.1009-444X.2017.02.012
[Abstract](21) [PDF 1242KB](355)
摘要:
基于通信的列车控制(CBTC)系统采用独立于轨道的车—地双向通信设备实现列车与地面控制系统之间的连续式双向通信.介绍了CBTC系统下无线车地通信原理及通信异常情况,并针对其关键设备无线接入点(AP)进行一定程度的剖析.利用上海地铁11号线的设备,通过现场抽样调查、故障汇总和比较分析等方法,对引起AP设备故障的各个末端原因进行分析,确定了AP设备故障的3种要因及解决方案,提出了建立采用TD-LTE技术的通信架构的设想.
Research on Influence Factors of Autonomous Learning Effect Based on E-Learning Platform
ZOU Yujie, XIAO Xiang, LIU Fuyao, LU Suola
2018, 32(4): 372-375.   doi: 10.3969/j.issn.1009-444X.2018.04.016
[Abstract](26) [PDF 216KB](72)
摘要:
网络教学平台是信息化条件下高等学校教育教学的重要手段.结合实际调查数据,采用因子分析方法对大学生基于网络教学平台自主学习效果的影响因素进行分析.研究得出影响大学生自主学习效果的主要影响因素,并提出提高自主学习效果的若干建议.
Scene Change Detection Algorithm and Implementation Based on Double Threshold Gray Histogram
LU Siye, LI Hongyan, SUN Jianhao, SONG Ze, CAO Yu
2018, 32(1): 91-94.   doi: 10.3969/j.issn.1009-444X.2018.01.019
[Abstract](24) [PDF 2133KB](74)
摘要:
提出基于双阈值灰度直方图的场景切换检测算法.在传统场景切换检测算法基础上,根据动态高低阈值判断是否发生场景突变及场景渐变,在场景渐变情形中,进一步通过检测非相邻帧的帧差值来判断是否发生场景切换.Matlab仿真环境实验结果表明:该算法有效克服了传统灰度法的误检和直方图法的漏检等不足,具有较高的识别准确率和查全率.
Research Progress on Waterborne Industrial Coatings Technology
YU Dayang, WEN Shaoguo, WANG Jihu, LUO Jian, WU Youtong, YU Shiyin
2017, 31(1): 20-24.   doi: 10.3969/j.issn.1009-444X.2017.01.005
[Abstract](25) [PDF 1227KB](119)
摘要:
介绍了水性工业涂料用丙烯酸酯、聚氨酯、环氧和醇酸4种树脂水性化的最新研究进展.对水性工业涂料的成膜机制进行了总结,并对水分散型、水稀释型等工业涂料的成膜机制做出进一步探讨.总结了水性工业涂料在应用过程中出现的问题并提出解决办法,展望了工业涂料水性化技术面临的挑战与机遇.
About Journal
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Chinese    Quarterly

Supervisor: Shanghai Municipal Education Commission

Sponsors by: Shanghai University of Engineering Science

Publisher: Editorial Department of Journal of Shanghai University of Engineering Science

Editor-in-Chief: WANG Yansong

Email: xuebao@sues.edu.cn

ISSN1009-444X

CN31-1598/T

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