Journal of the Chinese Institute of Engineers最新文献_第8页

Numerical simulation of scouring around groups of six cylinders with different flow directions 不同流动方向下六圆柱群冲刷的数值模拟

IF 1.1 4区工程技术

Journal of the Chinese Institute of Engineers Pub Date : 2023-04-05 DOI: 10.1080/02533839.2023.2194919

Aisyah Dwi Puspasari, Jyh-Haw Tang

{"title":"Numerical simulation of scouring around groups of six cylinders with different flow directions","authors":"Aisyah Dwi Puspasari, Jyh-Haw Tang","doi":"10.1080/02533839.2023.2194919","DOIUrl":"https://doi.org/10.1080/02533839.2023.2194919","url":null,"abstract":"ABSTRACT Scouring around the pile foundation is one of the potential failures of offshore bridges that must be assessed due to the possibility of damaging the bridge structure. However, there is still few in-depth research regarding local scour simulations around groups of six cylinders consisting of more than one row, which is most widely used for group arrangement performed numerically. The maximum scour depth and its mechanism surrounding the six-cylinder group were determined by numerical simulation of scour consisting of multiple rows arranged side-by-side and in tandem with different pile spacing ratios using Flow-3D software. A validation study using experimental investigation was completed to verify the accuracy of the computational model. Numerical simulations employing the Van Rijn transport rate Equation and the RNG k – ɛ turbulence model produced results for scour depth evolution and bed elevation contour, which were in accordance with the experimental study. The numerical results show that the best arrangement for the minimum scour depth of the six-cylinder group is the tandem arrangement of two rows and three columns with pile spacing ratio of 3.5. As a result of this study, engineers can optimize the design of bridge pile foundations to enhance safety and economic efficiency.","PeriodicalId":17313,"journal":{"name":"Journal of the Chinese Institute of Engineers","volume":"12 1","pages":"420 - 430"},"PeriodicalIF":1.1,"publicationDate":"2023-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75690964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multi-objective optimization of mechanical and microstructural characteristics in a stir casting process of MWCNTs/Al6082 composites using neutrosophic TOPSIS and GRA 利用嗜中性TOPSIS和GRA对MWCNTs/Al6082复合材料搅拌铸造过程力学和微观组织特性进行多目标优化

IF 1.1 4区工程技术

Journal of the Chinese Institute of Engineers Pub Date : 2023-04-04 DOI: 10.1080/02533839.2023.2194922

Madhusudan Baghel, C. Krishna

{"title":"Multi-objective optimization of mechanical and microstructural characteristics in a stir casting process of MWCNTs/Al6082 composites using neutrosophic TOPSIS and GRA","authors":"Madhusudan Baghel, C. Krishna","doi":"10.1080/02533839.2023.2194922","DOIUrl":"https://doi.org/10.1080/02533839.2023.2194922","url":null,"abstract":"ABSTRACT The objective of this paper is to find optimum process parameters of stir casting process for multi-walled carbon nanotubes (MWCNTs) reinforced Al6082 composites in a multi-objective optimization context. In this work, output parameters include ultimate tensile strength (UTS), hardness, compressive strength (CS), and uniform distribution of MWCNTs. Among these, first three parameters can be measured, and data can be obtained in quantitative terms. However, uniformity of distribution of MWCNT is a qualitative variable, and hence neutrosophic sets are used in this work. Each of the four input process parameters, such as fraction weight of MWCNTs, stirring speed, furnace temperature, and stirring time, are taken at three levels each, and experiments are designed using Taguchi L27 array. Information entropy method is used to compute the weights of output parameters. TOPSIS method is used to normalize the quantitative data, and neutrosophic TOPSIS is applied for normalizing the data related to uniformity. It is found that MWCNT’s percentage of 0.9, speed of 450 rpm, temperature of 800°C, and time of 10 minutes, yield best output parameters. Neutrosophic gray relational analysis is also used to find optimum solution for above case, and the optimum values obtained from both methods are compared.","PeriodicalId":17313,"journal":{"name":"Journal of the Chinese Institute of Engineers","volume":"4 1","pages":"345 - 354"},"PeriodicalIF":1.1,"publicationDate":"2023-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83750757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

An infinite-order integral disturbance observer for improved estimation of periodic disturbances in motion control systems 一种用于改进运动控制系统周期扰动估计的无限阶积分扰动观测器

IF 1.1 4区工程技术

Journal of the Chinese Institute of Engineers Pub Date : 2023-04-03 DOI: 10.1080/02533839.2023.2194923

Yu-Sheng Lu, Shang-Hao Chang

引用次数: 0

River bend sediment management using modified triangular vanes 改良三角叶片对河曲沉积物的治理

IF 1.1 4区工程技术

Journal of the Chinese Institute of Engineers Pub Date : 2023-04-03 DOI: 10.1080/02533839.2023.2194924

Mahmood Shafai Bejestan, Mohsen Dorosti, Farshid Amirsalari Meymani, Mohammad Bahrami Yarahmadi

{"title":"River bend sediment management using modified triangular vanes","authors":"Mahmood Shafai Bejestan, Mohsen Dorosti, Farshid Amirsalari Meymani, Mohammad Bahrami Yarahmadi","doi":"10.1080/02533839.2023.2194924","DOIUrl":"https://doi.org/10.1080/02533839.2023.2194924","url":null,"abstract":"ABSTRACT Triangular vanes (TVs) are among the flow pattern correction structures which have recently been considered environmentally friendly structures against river bend bank erosion. However, the scour around the structure’s tip may cause its failure. On the other hand, it has been shown that the use of slot in the bridge pier and bridge abutment is effective in reducing scour depth, hence in this study, the effect of four different positions of rectangular slot on TV: Case 1) near the TV’s tip, parallel to the vane’s chord and close to the bed; Case 2) near the outer bank, parallel to the vane’s chord and close to the water surface; Case 3) horizontally and near the bed and Case 4) vertically and near the outer bank is experimentally studied in a 90° mild bend flume. The maximum scour depth (ds), and the point bar height at the end of experiments were compared with the case of no slot (Case 0). The best performance in reducing ds was obtained for Case 1 and then Case 3 with 24% and 19% reduction compared to Case 0, respectively. Poor performance was found for Case 2.","PeriodicalId":17313,"journal":{"name":"Journal of the Chinese Institute of Engineers","volume":"26 1","pages":"389 - 398"},"PeriodicalIF":1.1,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84014107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Potential pozzolanic reactivity of recycled aggregates and waste powders as cement mortar component 再生骨料和废粉作为水泥砂浆组分的潜在火山灰反应性

IF 1.1 4区工程技术

Journal of the Chinese Institute of Engineers Pub Date : 2023-04-03 DOI: 10.1080/02533839.2023.2194920

Chung-Hao Wu, Wei-Chien Wang, Chou Hsuan Jung

引用次数: 3

Research and implementation of order-oriented textile production scheduling system 面向订单的纺织品生产调度系统的研究与实现

IF 1.1 4区工程技术

Journal of the Chinese Institute of Engineers Pub Date : 2023-04-03 DOI: 10.1080/02533839.2023.2194915

Heng Ding, Haoyu Gao, Yude Dong, Suyun Huang

{"title":"Research and implementation of order-oriented textile production scheduling system","authors":"Heng Ding, Haoyu Gao, Yude Dong, Suyun Huang","doi":"10.1080/02533839.2023.2194915","DOIUrl":"https://doi.org/10.1080/02533839.2023.2194915","url":null,"abstract":"ABSTRACT A production planning and scheduling system for small and medium-sized textile enterprises is designed according to the actual needs of textile enterprises in the process of informatization construction. The system considers orders as the primary focus and employs modular design ideas to design functional modules and standardized interfaces based on a three-tier architecture. Furthermore, it uses a database structure design and computer programming to ensure the efficiency and reliability of information services. The main functions of the system include prioritization, automatic production scheduling, order processing, and real-time monitoring of the machine. An analytical hierarchy process optimization method is proposed and applied to a textile enterprise. The running results reveal that this method can effectively reduce the order completion time, improve punctuality delivery rate, save 2–3 days of production planning and machine scheduling for the enterprise, improve the resource allocation ability and production management efficiency, and has guiding significance for small- and medium-sized textile enterprises to realize informatization.","PeriodicalId":17313,"journal":{"name":"Journal of the Chinese Institute of Engineers","volume":"2 1","pages":"331 - 344"},"PeriodicalIF":1.1,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88530083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An AHP-based prioritization model for bridge maintenance after natural disasters 基于层次分析法的自然灾害后桥梁维修优先排序模型

IF 1.1 4区工程技术

Journal of the Chinese Institute of Engineers Pub Date : 2023-02-09 DOI: 10.1080/02533839.2023.2170927

N. Yau, H. Liao, John Mark M. Tabor, M. Jallow

{"title":"An AHP-based prioritization model for bridge maintenance after natural disasters","authors":"N. Yau, H. Liao, John Mark M. Tabor, M. Jallow","doi":"10.1080/02533839.2023.2170927","DOIUrl":"https://doi.org/10.1080/02533839.2023.2170927","url":null,"abstract":"ABSTRACT The island of Taiwan’s location, topography, and weak geological structure make its bridges vulnerable to the destructive effects of natural disasters. This was revealed in the aftermath of the 1999 Chi-Chi earthquake and 2009 Typhoon Morakot, which severely damaged hundreds of bridges across several cities and counties. In crises like these, the immediate restoration of bridges to their pre-disaster levels of safety and serviceability is of the utmost importance, as they serve as critical channels for emergency response and socio-economic recovery. However, the national disaster management system currently lacks an efficient strategy for dealing with such situations. This paper proposes an AHP-based prioritization model to support bridge officials in establishing the order of priority for post-disaster bridge maintenance actions. Through the evaluation of twelve decision criteria, bridges are ranked and categorized according to their vulnerability to disaster-induced damage and their strategic importance. The model uses the information available from the Taiwan Bridge Management System (TBMS) and can be applied to bridge maintenance management following disasters triggered by earthquakes, typhoons, or floods. A case study based on the 2018 Hualien earthquake was performed to demonstrate the model’s utility.","PeriodicalId":17313,"journal":{"name":"Journal of the Chinese Institute of Engineers","volume":"3 1","pages":"255 - 266"},"PeriodicalIF":1.1,"publicationDate":"2023-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85342897","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on the impact of underground excavation metro on surface traffic safety and assessment method 地铁地下开挖对地面交通安全的影响及评价方法研究

IF 1.1 4区工程技术

Journal of the Chinese Institute of Engineers Pub Date : 2023-02-08 DOI: 10.1080/02533839.2023.2170928

Xin Chen, Qing-song Zhang, Ren-Tai Liu, Dukun Zhao, Hong-Zhao Li, Xu-Dong Pan, Jin-Yan, Wan-Li He, Le-Le Shi, Shao-Xuan Guo

{"title":"Research on the impact of underground excavation metro on surface traffic safety and assessment method","authors":"Xin Chen, Qing-song Zhang, Ren-Tai Liu, Dukun Zhao, Hong-Zhao Li, Xu-Dong Pan, Jin-Yan, Wan-Li He, Le-Le Shi, Shao-Xuan Guo","doi":"10.1080/02533839.2023.2170928","DOIUrl":"https://doi.org/10.1080/02533839.2023.2170928","url":null,"abstract":"ABSTRACT This study focuses on a problem that has been seriously troubled urban traffic managers: the impact of underground excavation metros on surface traffic safety during construction. In underground construction, surface subsidence and road collapse due to concealed underground construction constantly occur, resulting in casualties property damage and seriously impairing normal urban road traffic. Urban road managers urgently need a quick, objective, and easy-to-use method for the early warning and prevention of such risks. Therefore, this study collates relevant accident cases that have occurred in China over the last 20 years and summarises the impact mechanisms of concealed underground works affecting surface road traffic capacity through a detailed study of natural factors, engineering geology, types of structures, and types of workmanship. Two indices, Rank( ) and , are proposed to describe the impact of concealed underground works on surface traffic capacity, while an early warning method based on data on the impact of urban road capacity by concealed underground works is established using integrated learning methods and is well applied in practical projects. The results of this study are important for helping city managers quickly assess urban road traffic risks.","PeriodicalId":17313,"journal":{"name":"Journal of the Chinese Institute of Engineers","volume":"2 1","pages":"267 - 281"},"PeriodicalIF":1.1,"publicationDate":"2023-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78767704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Simulation and implementation of a harmonics suppression technique for a single-phase full-bridge converters 单相全桥变换器谐波抑制技术的仿真与实现

IF 1.1 4区工程技术

Journal of the Chinese Institute of Engineers Pub Date : 2023-02-08 DOI: 10.1080/02533839.2022.2161944

Ching-Chun Chuang, Sen-Tung Wu, H. Chiu, Yu-Kang Lo

引用次数: 0

Establishment of urban road maintenance model based on performance-based contracts 基于绩效契约的城市道路养护模式建立

IF 1.1 4区工程技术

Journal of the Chinese Institute of Engineers Pub Date : 2023-02-07 DOI: 10.1080/02533839.2023.2170922

Jyh-Bin Yang, C. Tseng, Jia-Ruey Chang, Chia-Ming Liu

{"title":"Establishment of urban road maintenance model based on performance-based contracts","authors":"Jyh-Bin Yang, C. Tseng, Jia-Ruey Chang, Chia-Ming Liu","doi":"10.1080/02533839.2023.2170922","DOIUrl":"https://doi.org/10.1080/02533839.2023.2170922","url":null,"abstract":"ABSTRACT Maintaining urban roads in a good condition is a basic duty of any city government. Traditionally, urban road maintenance is performed by a contractor that provides the required manpower and equipment resources to complete the necessary daily inspection and repair works. Although the quality of roads is acceptable, the inefficiency is evident everywhere. A performance-based contract (PBC) is used in the field of road maintenance in various countries, primarily for highway or large-area pavement rehabilitation and follow-up maintenance as the subject of the contract. In this study, we applied the design thinking approach to establish a PBC implementation model for urban road patrolling and sporadic repair. Moreover, to ensure the feasibility of the proposed model and to decrease the political risk of execution outcome, we adopted a two-stage validation in this study. The proposed performance indicators were examined by the historical data of road maintenance in Taipei City, and the feasibility of the proposed PBC implementation model was then confirmed by domain experts. The research outcomes could be used to develop PBCs for maintenance management of other infrastructures with better maintenance performances.","PeriodicalId":17313,"journal":{"name":"Journal of the Chinese Institute of Engineers","volume":"12 1","pages":"208 - 219"},"PeriodicalIF":1.1,"publicationDate":"2023-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75268601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2