Pub Date : 2023-04-05DOI: 10.1080/02533839.2023.2194919
Aisyah Dwi Puspasari, Jyh-Haw Tang
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.
摘要:桩基周围冲刷是海上桥梁的潜在破坏之一，有可能破坏桥梁结构，必须对其进行评估。然而，对于多排六圆柱群的局部冲刷模拟，目前还很少有深入的研究，这是目前最广泛使用的数值组排方法。采用Flow-3D软件对不同桩间距比下多排并排串联冲刷进行数值模拟，确定了六柱群周围的最大冲刷深度及其机理。通过实验研究验证了计算模型的准确性。采用Van Rijn输运速率方程和RNG k - i湍流模型进行的数值模拟得到了冲刷深度演化和河床高程等高线，与实验研究结果基本一致。数值计算结果表明，在桩间距比为3.5的情况下，两排三柱串联布置是最小冲刷深度的最佳布置方式。研究结果可为桥梁桩基的优化设计提供参考，提高其安全性和经济性。
{"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}
Pub Date : 2023-04-04DOI: 10.1080/02533839.2023.2194922
Madhusudan Baghel, C. Krishna
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.
{"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}
Pub Date : 2023-04-03DOI: 10.1080/02533839.2023.2194923
Yu-Sheng Lu, Shang-Hao Chang
ABSTRACT In this paper, a disturbance observer is devised for motion control systems suffering unknown periodic disturbances. In the proposed scheme, the structure of a so-called integral disturbance observer is utilized for its error-feedback form, and the repetitive learning control theory is applied to the observer design, constituting an infinite-order integral disturbance observer to obtain an enhanced estimation of a periodic disturbance. A comparative study of different disturbance observers is performed, and experimental results are reported, practically showing the effectiveness of the proposed scheme.
{"title":"An infinite-order integral disturbance observer for improved estimation of periodic disturbances in motion control systems","authors":"Yu-Sheng Lu, Shang-Hao Chang","doi":"10.1080/02533839.2023.2194923","DOIUrl":"https://doi.org/10.1080/02533839.2023.2194923","url":null,"abstract":"ABSTRACT In this paper, a disturbance observer is devised for motion control systems suffering unknown periodic disturbances. In the proposed scheme, the structure of a so-called integral disturbance observer is utilized for its error-feedback form, and the repetitive learning control theory is applied to the observer design, constituting an infinite-order integral disturbance observer to obtain an enhanced estimation of a periodic disturbance. A comparative study of different disturbance observers is performed, and experimental results are reported, practically showing the effectiveness of the proposed scheme.","PeriodicalId":17313,"journal":{"name":"Journal of the Chinese Institute of Engineers","volume":"554 1","pages":"367 - 379"},"PeriodicalIF":1.1,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85408905","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}
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.
{"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}
Pub Date : 2023-04-03DOI: 10.1080/02533839.2023.2194920
Chung-Hao Wu, Wei-Chien Wang, Chou Hsuan Jung
ABSTRACT In this study, the use of recycled fine aggregates and waste powders in mortar was discussed, in which the pozzolanic reaction and the effect on strength properties of the resulting mortar were experimentally investigated. Test results showed that the compressive strengths of mortars with fine recycled brick and tile particles were lower than those of the control mortar at age of 7 days in the range of 72–92%, but reached 82–98% at age of 90 days, respectively. Because of the cement reduction, the mortars with waste powder cannot reach the strength level of the control mortar, and the strength of the mortars decreased with the increase in the cement replacement ratio. The strength efficiency of cement in mortar with the waste powders mortars increases with the increase of waste powder replacement ratio at later ages (56 and 90 days). This may be interpreted by the waste powders, being composed of major acidic oxides, could trigger the pozzolanic reaction to provide additional strength gains for mortar.
{"title":"Potential pozzolanic reactivity of recycled aggregates and waste powders as cement mortar component","authors":"Chung-Hao Wu, Wei-Chien Wang, Chou Hsuan Jung","doi":"10.1080/02533839.2023.2194920","DOIUrl":"https://doi.org/10.1080/02533839.2023.2194920","url":null,"abstract":"ABSTRACT In this study, the use of recycled fine aggregates and waste powders in mortar was discussed, in which the pozzolanic reaction and the effect on strength properties of the resulting mortar were experimentally investigated. Test results showed that the compressive strengths of mortars with fine recycled brick and tile particles were lower than those of the control mortar at age of 7 days in the range of 72–92%, but reached 82–98% at age of 90 days, respectively. Because of the cement reduction, the mortars with waste powder cannot reach the strength level of the control mortar, and the strength of the mortars decreased with the increase in the cement replacement ratio. The strength efficiency of cement in mortar with the waste powders mortars increases with the increase of waste powder replacement ratio at later ages (56 and 90 days). This may be interpreted by the waste powders, being composed of major acidic oxides, could trigger the pozzolanic reaction to provide additional strength gains for mortar.","PeriodicalId":17313,"journal":{"name":"Journal of the Chinese Institute of Engineers","volume":"39 1","pages":"399 - 408"},"PeriodicalIF":1.1,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74536397","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}
Pub Date : 2023-04-03DOI: 10.1080/02533839.2023.2194915
Heng Ding, Haoyu Gao, Yude Dong, Suyun Huang
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.
{"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}
Pub Date : 2023-02-09DOI: 10.1080/02533839.2023.2170927
N. Yau, H. Liao, John Mark M. Tabor, M. Jallow
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.
{"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}
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.
{"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}
Pub Date : 2023-02-08DOI: 10.1080/02533839.2022.2161944
Ching-Chun Chuang, Sen-Tung Wu, H. Chiu, Yu-Kang Lo
ABSTRACT This paper presents a harmonic suppression technique for a single-phase full-bridge converter, and the mathematical principles underlying a modified PWM technique are discussed. To verify the effectiveness of the proposed technique, voltage and current sensor circuits in a single-phase full-bridge converter connected to a digital signal processor controller with an analog-to-digital converter were analyzed experimentally. The output voltage harmonics of the converter were examined, and the frequency spectra of the output voltage were analyzed. Furthermore, a digital control system with a TMS320F2808 digital signal microcontroller was realized. The experimental results verified the effectiveness of the proposed technique in suppressing low-frequency harmonic in a prototype of a converter.
{"title":"Simulation and implementation of a harmonics suppression technique for a single-phase full-bridge converters","authors":"Ching-Chun Chuang, Sen-Tung Wu, H. Chiu, Yu-Kang Lo","doi":"10.1080/02533839.2022.2161944","DOIUrl":"https://doi.org/10.1080/02533839.2022.2161944","url":null,"abstract":"ABSTRACT This paper presents a harmonic suppression technique for a single-phase full-bridge converter, and the mathematical principles underlying a modified PWM technique are discussed. To verify the effectiveness of the proposed technique, voltage and current sensor circuits in a single-phase full-bridge converter connected to a digital signal processor controller with an analog-to-digital converter were analyzed experimentally. The output voltage harmonics of the converter were examined, and the frequency spectra of the output voltage were analyzed. Furthermore, a digital control system with a TMS320F2808 digital signal microcontroller was realized. The experimental results verified the effectiveness of the proposed technique in suppressing low-frequency harmonic in a prototype of a converter.","PeriodicalId":17313,"journal":{"name":"Journal of the Chinese Institute of Engineers","volume":"25 1","pages":"141 - 153"},"PeriodicalIF":1.1,"publicationDate":"2023-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90149399","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}
Pub Date : 2023-02-07DOI: 10.1080/02533839.2023.2170922
Jyh-Bin Yang, C. Tseng, Jia-Ruey Chang, Chia-Ming Liu
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.
{"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}
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