Pub Date : 2023-02-06DOI: 10.1080/02533839.2022.2161946
Chien-Hsing Lee, C. Hung, Yao-Wei Cheng, C. ChiuHuang, F. Chen
ABSTRACT In this study, an experimental machine for conducting flat strip drawing tests at high temperature was developed to investigate the interfacial tribological properties and evaluate the coefficient of friction in hot stamping. The strength and rigidity required for the testing machine were examined by finite element analysis and confirmed by actual drawing tests. The consistent and reproducible data further validated the reliable performance of the developed friction test machine. The high temperature tribological characteristics at the interface between the sheet specimen and clamping dies were also investigated. The thermal contact condition between the die and the blank was found to be significantly affected by the geometry of the clamping die, and an optimal clamping die design was then proposed accordingly for generating a nearly uniform contact condition in the experiment. With the developed testing machine, high temperature friction tests were conducted on three kinds of boron steel to evaluate the coefficients of friction under various temperatures and contact pressures. The experimental results revealed that the coefficient of friction at elevated temperatures was more sensitive to temperature than to contact pressure. A lower coefficient of friction was also noted for coated boron steel than for the bare equivalent.
{"title":"Characterization of the interfacial friction properties in the hot stamping process","authors":"Chien-Hsing Lee, C. Hung, Yao-Wei Cheng, C. ChiuHuang, F. Chen","doi":"10.1080/02533839.2022.2161946","DOIUrl":"https://doi.org/10.1080/02533839.2022.2161946","url":null,"abstract":"ABSTRACT In this study, an experimental machine for conducting flat strip drawing tests at high temperature was developed to investigate the interfacial tribological properties and evaluate the coefficient of friction in hot stamping. The strength and rigidity required for the testing machine were examined by finite element analysis and confirmed by actual drawing tests. The consistent and reproducible data further validated the reliable performance of the developed friction test machine. The high temperature tribological characteristics at the interface between the sheet specimen and clamping dies were also investigated. The thermal contact condition between the die and the blank was found to be significantly affected by the geometry of the clamping die, and an optimal clamping die design was then proposed accordingly for generating a nearly uniform contact condition in the experiment. With the developed testing machine, high temperature friction tests were conducted on three kinds of boron steel to evaluate the coefficients of friction under various temperatures and contact pressures. The experimental results revealed that the coefficient of friction at elevated temperatures was more sensitive to temperature than to contact pressure. A lower coefficient of friction was also noted for coated boron steel than for the bare equivalent.","PeriodicalId":17313,"journal":{"name":"Journal of the Chinese Institute of Engineers","volume":"50 1","pages":"163 - 176"},"PeriodicalIF":1.1,"publicationDate":"2023-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86141042","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 : 2023-02-05DOI: 10.1080/02533839.2023.2170920
C. Kang, S. Teng, J. Hu, Kejin Ding, Wenbin Zhang
ABSTRACT The present study aims to explain the effect of impeller structure on performance of a double-volute centrifugal pump. The impeller with 5 long blades and 10 splitter blades was proposed. An experimental work was performed to compare performance between the pumps equipped separately with the proposed and the conventional impellers. Distribution of pressure fluctuations in streamwise direction was captured at different flow rates. Vibration of the pump was measured through deploying monitoring points on the base plate. With participation of the splitter blades, harmonics of the blade passing frequency remain dominant but corresponding pressure fluctuation is suppressed. Characteristic frequencies attenuate from the division plate to the pump outlet, which is more remarkable for the new impeller scheme. The root mean square (RMS) pressure fluctuation amplitude arrives at its minimum at the design flow rate, which is shared by the two impeller schemes. The impeller with splitter blades is responsible for lower RMS pressure fluctuation amplitude. Vibration of the pump is alleviated with the proposed impeller. Vibration acceleration associated with the characteristic frequencies is reduced relative to that of the conventional impeller scheme.
{"title":"Mitigation of pressure fluctuation through an impeller with splitter blades for a double-volute centrifugal pump","authors":"C. Kang, S. Teng, J. Hu, Kejin Ding, Wenbin Zhang","doi":"10.1080/02533839.2023.2170920","DOIUrl":"https://doi.org/10.1080/02533839.2023.2170920","url":null,"abstract":"ABSTRACT The present study aims to explain the effect of impeller structure on performance of a double-volute centrifugal pump. The impeller with 5 long blades and 10 splitter blades was proposed. An experimental work was performed to compare performance between the pumps equipped separately with the proposed and the conventional impellers. Distribution of pressure fluctuations in streamwise direction was captured at different flow rates. Vibration of the pump was measured through deploying monitoring points on the base plate. With participation of the splitter blades, harmonics of the blade passing frequency remain dominant but corresponding pressure fluctuation is suppressed. Characteristic frequencies attenuate from the division plate to the pump outlet, which is more remarkable for the new impeller scheme. The root mean square (RMS) pressure fluctuation amplitude arrives at its minimum at the design flow rate, which is shared by the two impeller schemes. The impeller with splitter blades is responsible for lower RMS pressure fluctuation amplitude. Vibration of the pump is alleviated with the proposed impeller. Vibration acceleration associated with the characteristic frequencies is reduced relative to that of the conventional impeller scheme.","PeriodicalId":17313,"journal":{"name":"Journal of the Chinese Institute of Engineers","volume":"37 1","pages":"293 - 303"},"PeriodicalIF":1.1,"publicationDate":"2023-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85364601","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 : 2023-02-05DOI: 10.1080/02533839.2023.2170925
Shih-Hsu Wang
ABSTRACT To reasonably utilize human resources, engineering consulting firms should establish effective task assignment mechanisms. In this study, the consulting engineer selection matrix (CESM) was proposed to select engineers for a work item of an engineering consulting project on the basis of contract amount reasonableness, work item importance, engineer hourly rate, and engineer experience. The matrix identified the available engineers in an engineering consulting firm who possessed the operating experience to execute a specific work item. The matrix also divided the engineers into four quadrants depending on contract amount reasonableness and work item importance. A project manager then selected the engineers of a work item depending on their hourly rate (high or low) and experience (experienced or inexperienced) and depending on four task assignment strategies, which entailed the lowest cost, maximum engineer experience, optimal cost efficiency, and imparting experience. The results confirmed that the CESM reduced the salary expenditure of projects without reducing the competence requirements of team members or the investment of human resources. It also allowed project managers to select suitable engineers as project team members instead of passively waiting for functional departments to allocate engineers.
{"title":"Effective assignment of work items for an engineering consulting project based on consulting engineer selection matrix","authors":"Shih-Hsu Wang","doi":"10.1080/02533839.2023.2170925","DOIUrl":"https://doi.org/10.1080/02533839.2023.2170925","url":null,"abstract":"ABSTRACT To reasonably utilize human resources, engineering consulting firms should establish effective task assignment mechanisms. In this study, the consulting engineer selection matrix (CESM) was proposed to select engineers for a work item of an engineering consulting project on the basis of contract amount reasonableness, work item importance, engineer hourly rate, and engineer experience. The matrix identified the available engineers in an engineering consulting firm who possessed the operating experience to execute a specific work item. The matrix also divided the engineers into four quadrants depending on contract amount reasonableness and work item importance. A project manager then selected the engineers of a work item depending on their hourly rate (high or low) and experience (experienced or inexperienced) and depending on four task assignment strategies, which entailed the lowest cost, maximum engineer experience, optimal cost efficiency, and imparting experience. The results confirmed that the CESM reduced the salary expenditure of projects without reducing the competence requirements of team members or the investment of human resources. It also allowed project managers to select suitable engineers as project team members instead of passively waiting for functional departments to allocate engineers.","PeriodicalId":17313,"journal":{"name":"Journal of the Chinese Institute of Engineers","volume":"18 1","pages":"229 - 241"},"PeriodicalIF":1.1,"publicationDate":"2023-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86023207","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 : 2023-02-05DOI: 10.1080/02533839.2023.2170923
Bing Li, Lixu Fang, Huancheng Zhu, Yagang Zou
ABSTRACT Tea screening is a key process in the tea refining and processing industry. However, the tea shakers which are key components in tea screening have low screening efficiencies, and there is a lack of research on the optimization of key factors affecting the same. In this study, a tea vibrating-shifting machine driven by an eccentric wheel-linkage was designed. The force and motion process of tea particles were theoretically analyzed, and the dynamic equation of the tea particles was deduced. For improving the screening efficiency of the tea vibrating-shifting machine, the experimental prototype was optimized with the screening efficiency as the objective function. Additionally, a quadratic orthogonal test of response surface was established using a commercial software. The analysis of variance indicated the following parameters affecting the screening efficiency in decreasing order of influence: vibration direction angle, eccentric wheel angular velocity, and sieve mesh inclination angle. As per the optimization results of regression equation, for a vibration direction angle of 21.68°, the sieve mesh inclination angle was 2.95°, the eccentric wheel angular velocity was 25.24 rad/s, and the maximum screening efficiency was 86.24%.
{"title":"Design and optimization of a tea vibrating-shifting machinery","authors":"Bing Li, Lixu Fang, Huancheng Zhu, Yagang Zou","doi":"10.1080/02533839.2023.2170923","DOIUrl":"https://doi.org/10.1080/02533839.2023.2170923","url":null,"abstract":"ABSTRACT Tea screening is a key process in the tea refining and processing industry. However, the tea shakers which are key components in tea screening have low screening efficiencies, and there is a lack of research on the optimization of key factors affecting the same. In this study, a tea vibrating-shifting machine driven by an eccentric wheel-linkage was designed. The force and motion process of tea particles were theoretically analyzed, and the dynamic equation of the tea particles was deduced. For improving the screening efficiency of the tea vibrating-shifting machine, the experimental prototype was optimized with the screening efficiency as the objective function. Additionally, a quadratic orthogonal test of response surface was established using a commercial software. The analysis of variance indicated the following parameters affecting the screening efficiency in decreasing order of influence: vibration direction angle, eccentric wheel angular velocity, and sieve mesh inclination angle. As per the optimization results of regression equation, for a vibration direction angle of 21.68°, the sieve mesh inclination angle was 2.95°, the eccentric wheel angular velocity was 25.24 rad/s, and the maximum screening efficiency was 86.24%.","PeriodicalId":17313,"journal":{"name":"Journal of the Chinese Institute of Engineers","volume":"54 1","pages":"304 - 314"},"PeriodicalIF":1.1,"publicationDate":"2023-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89936879","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 : 2023-02-05DOI: 10.1080/02533839.2023.2170924
Lian Xue, Chaoran Li, Yimin Jin
ABSTRACT The abundant carbon emissions generated by the construction industry have gradually become a significant problem. Rather than employing traditional construction methods, the industrialized building system adopts the efficient on-site assembly of prefabricated components, which provides a new solution for reducing industry carbon emissions. Currently, great differences exist in the life cycle assessment schemes for prefabricated buildings and components, which requires considering many different factors. The accuracy and applicability of the results must therefore be improved. In this study, an improved life cycle calculation framework is proposed to assess the carbon emissions of prefabricated concrete columns in the construction stage. Based on the commonly used calculation methods of carbon emission factors, the framework uses a new calculation method with more considerations for vehicle transportation and uses the consumer lifestyle method to estimate construction workers’ carbon emissions. The framework also fully considers the loss of components in the transportation process. The calculated results are compared with the traditional carbon emission factor calculation methods. Overall, the results for the framework are relatively significant because they more comprehensively consider various factors when compared to results using the traditional calculation methods.
{"title":"An improved carbon emission calculation framework of precast concrete column in construction stage based on LCA","authors":"Lian Xue, Chaoran Li, Yimin Jin","doi":"10.1080/02533839.2023.2170924","DOIUrl":"https://doi.org/10.1080/02533839.2023.2170924","url":null,"abstract":"ABSTRACT The abundant carbon emissions generated by the construction industry have gradually become a significant problem. Rather than employing traditional construction methods, the industrialized building system adopts the efficient on-site assembly of prefabricated components, which provides a new solution for reducing industry carbon emissions. Currently, great differences exist in the life cycle assessment schemes for prefabricated buildings and components, which requires considering many different factors. The accuracy and applicability of the results must therefore be improved. In this study, an improved life cycle calculation framework is proposed to assess the carbon emissions of prefabricated concrete columns in the construction stage. Based on the commonly used calculation methods of carbon emission factors, the framework uses a new calculation method with more considerations for vehicle transportation and uses the consumer lifestyle method to estimate construction workers’ carbon emissions. The framework also fully considers the loss of components in the transportation process. The calculated results are compared with the traditional carbon emission factor calculation methods. Overall, the results for the framework are relatively significant because they more comprehensively consider various factors when compared to results using the traditional calculation methods.","PeriodicalId":17313,"journal":{"name":"Journal of the Chinese Institute of Engineers","volume":"32 1","pages":"220 - 228"},"PeriodicalIF":1.1,"publicationDate":"2023-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86280191","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 : 2023-02-05DOI: 10.1080/02533839.2023.2170929
Yu-Hung Pai, C. Kuo, C. Huang, C. Lin
ABSTRACT Replacing conventional ballast track, direct-fixation tracks (DFTs) are supposed to generate less noise and vibration; however, the authorities obtain more complaints by metropolitan residents. In order to investigate the modal frequencies of DFTs, field tests were performed on viaduct with I-shape concrete girder on Western Trunk Line of Taiwan Railway Administration (TRA). Experimental modal analysis (EMA) was first conducted to capture the natural frequencies of DFT and frequency response function of the system. Vehicular vibrations were then measured to obtain the insertion loss of elastic baseplate and the frequency spectrum to reveal the effectiveness of DFTs in vibration reduction. The free vibration of the bridge after vehicle passing through was also collected to verify its nature frequencies. According to the results of field tests, the dynamic behavior of elastic baseplate should be considered in the system. To ensure those results, a finite element DFT model was established and given by the same hammer excitation from EMA. The findings from field tests match our finite element analysis, which have demonstrated that the major frequencies of DFT are not only close to 100 Hz and 630 Hz, respectively, but the mass of the elastic baseplate should not have been overlooked in simulation.
{"title":"The modal frequencies and effectiveness in vibration reduction of direct-fixation track on viaduct","authors":"Yu-Hung Pai, C. Kuo, C. Huang, C. Lin","doi":"10.1080/02533839.2023.2170929","DOIUrl":"https://doi.org/10.1080/02533839.2023.2170929","url":null,"abstract":"ABSTRACT Replacing conventional ballast track, direct-fixation tracks (DFTs) are supposed to generate less noise and vibration; however, the authorities obtain more complaints by metropolitan residents. In order to investigate the modal frequencies of DFTs, field tests were performed on viaduct with I-shape concrete girder on Western Trunk Line of Taiwan Railway Administration (TRA). Experimental modal analysis (EMA) was first conducted to capture the natural frequencies of DFT and frequency response function of the system. Vehicular vibrations were then measured to obtain the insertion loss of elastic baseplate and the frequency spectrum to reveal the effectiveness of DFTs in vibration reduction. The free vibration of the bridge after vehicle passing through was also collected to verify its nature frequencies. According to the results of field tests, the dynamic behavior of elastic baseplate should be considered in the system. To ensure those results, a finite element DFT model was established and given by the same hammer excitation from EMA. The findings from field tests match our finite element analysis, which have demonstrated that the major frequencies of DFT are not only close to 100 Hz and 630 Hz, respectively, but the mass of the elastic baseplate should not have been overlooked in simulation.","PeriodicalId":17313,"journal":{"name":"Journal of the Chinese Institute of Engineers","volume":"49 1","pages":"282 - 292"},"PeriodicalIF":1.1,"publicationDate":"2023-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79862239","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 : 2023-02-05DOI: 10.1080/02533839.2023.2170926
X. Zhang, He Ke, Mingxin Chi, Ruochen Wang
ABSTRACT In this study, we investigate the effect of paper straw board (PSB) on the seismic performance of cold-formed thin-walled steel composite walls (CFSCWs). Additionally, we compare the experimental results of CFSCW with PSB cladding with those of CFSCW with other wall panel cladding. The results show that PSB can effectively increase the shear bearing capacity of the composite wall, and because PSB is lightweight, CFSCW with PSB cladding is easy to construct. By using the finite element analysis (FEA) software ANSYS, a numerical simulation analysis of CFSCW with one-sided PSB cladding is performed, and the relevant parameters affecting the seismic performance are analyzed. The results indicate that a decrease in stud spacing, a decrease in peripheral self-tapping screw spacing, an increase in wall panel thickness, and an increase in section thickness of steel skeleton edge studs can effectively improve the shear bearing capacity and lateral stiffness within a certain range. Additionally, the decrease in the wall height-to-width ratio improves the lateral stiffness while decreasing the unit width shear bearing capacity.
{"title":"Numerical analysis of seismic performance of cold-formed composite walls with one-sided straw-board cladding","authors":"X. Zhang, He Ke, Mingxin Chi, Ruochen Wang","doi":"10.1080/02533839.2023.2170926","DOIUrl":"https://doi.org/10.1080/02533839.2023.2170926","url":null,"abstract":"ABSTRACT In this study, we investigate the effect of paper straw board (PSB) on the seismic performance of cold-formed thin-walled steel composite walls (CFSCWs). Additionally, we compare the experimental results of CFSCW with PSB cladding with those of CFSCW with other wall panel cladding. The results show that PSB can effectively increase the shear bearing capacity of the composite wall, and because PSB is lightweight, CFSCW with PSB cladding is easy to construct. By using the finite element analysis (FEA) software ANSYS, a numerical simulation analysis of CFSCW with one-sided PSB cladding is performed, and the relevant parameters affecting the seismic performance are analyzed. The results indicate that a decrease in stud spacing, a decrease in peripheral self-tapping screw spacing, an increase in wall panel thickness, and an increase in section thickness of steel skeleton edge studs can effectively improve the shear bearing capacity and lateral stiffness within a certain range. Additionally, the decrease in the wall height-to-width ratio improves the lateral stiffness while decreasing the unit width shear bearing capacity.","PeriodicalId":17313,"journal":{"name":"Journal of the Chinese Institute of Engineers","volume":"58 1","pages":"242 - 254"},"PeriodicalIF":1.1,"publicationDate":"2023-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85971015","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 : 2023-02-05DOI: 10.1080/02533839.2023.2170921
S. Yin
ABSTRACT This paper aims to numerically evaluate the performance of tuned liquid column damper (TLCD) on mitigating roll motion of a barge-type floating wind turbine system subjected to random excitation. The governing equations for modeling the interaction between the roll motion of the floating system and liquid sloshing in the TLCD were derived using a Lagrangian approach. Random excitation based on wave spectrum was generated to simulate applied moment. Then, under the constraints of barge dimension and vertical liquid column movement, Den Hartog’s method was used to obtain optimum TLCD parameters. The results show that the optimally designed TLCD can efficiently mitigate the roll motion of the floating wind turbine.
{"title":"Roll motion mitigation of a barge-type floating wind turbine under random excitation using a tuned liquid column damper","authors":"S. Yin","doi":"10.1080/02533839.2023.2170921","DOIUrl":"https://doi.org/10.1080/02533839.2023.2170921","url":null,"abstract":"ABSTRACT This paper aims to numerically evaluate the performance of tuned liquid column damper (TLCD) on mitigating roll motion of a barge-type floating wind turbine system subjected to random excitation. The governing equations for modeling the interaction between the roll motion of the floating system and liquid sloshing in the TLCD were derived using a Lagrangian approach. Random excitation based on wave spectrum was generated to simulate applied moment. Then, under the constraints of barge dimension and vertical liquid column movement, Den Hartog’s method was used to obtain optimum TLCD parameters. The results show that the optimally designed TLCD can efficiently mitigate the roll motion of the floating wind turbine.","PeriodicalId":17313,"journal":{"name":"Journal of the Chinese Institute of Engineers","volume":"789 1","pages":"197 - 207"},"PeriodicalIF":1.1,"publicationDate":"2023-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76926493","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 : 2023-01-23DOI: 10.1080/02533839.2022.2161939
Samaneh Shabani, N. Moghim, Ali Bohlooli
ABSTRACT Wireless channels have a broadcast nature based on which opportunistic routing protocols work. In opportunistic routing protocols, packets are forwarded by the intermediate nodes that hear their transmissions, which are called candidate forwarders. In most of these algorithms, the forwarder list is pre-determined. However, the energy-efficient selection of the forwarder list is a research topic that is not considered well. Energy Efficient OPportunistic Routing algorithm (EEOPR) is presented in this paper in which the forwarders are determined on the packets’ fly. EEOPR is a flexible method that performs the routing process locally, and the candidate forwarders are selected during the routing and for each packet. The process of the candidate nodes’ selection and their packet forwarding are managed by the Genetic algorithm according to the nodes’ remaining energy and their regions. Simulation results show that network performance is improved in EEOPR compared to ROMER and CORP-M in terms of throughput, the number of duplicate packets, and the network nodes’ residual energy.
{"title":"A new on the fly energy-efficient opportunistic routing in wireless multi-hop networks","authors":"Samaneh Shabani, N. Moghim, Ali Bohlooli","doi":"10.1080/02533839.2022.2161939","DOIUrl":"https://doi.org/10.1080/02533839.2022.2161939","url":null,"abstract":"ABSTRACT Wireless channels have a broadcast nature based on which opportunistic routing protocols work. In opportunistic routing protocols, packets are forwarded by the intermediate nodes that hear their transmissions, which are called candidate forwarders. In most of these algorithms, the forwarder list is pre-determined. However, the energy-efficient selection of the forwarder list is a research topic that is not considered well. Energy Efficient OPportunistic Routing algorithm (EEOPR) is presented in this paper in which the forwarders are determined on the packets’ fly. EEOPR is a flexible method that performs the routing process locally, and the candidate forwarders are selected during the routing and for each packet. The process of the candidate nodes’ selection and their packet forwarding are managed by the Genetic algorithm according to the nodes’ remaining energy and their regions. Simulation results show that network performance is improved in EEOPR compared to ROMER and CORP-M in terms of throughput, the number of duplicate packets, and the network nodes’ residual energy.","PeriodicalId":17313,"journal":{"name":"Journal of the Chinese Institute of Engineers","volume":"4 1","pages":"107 - 117"},"PeriodicalIF":1.1,"publicationDate":"2023-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83681074","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 : 2023-01-20DOI: 10.1080/02533839.2022.2161945
Dequan Zhu, Kejie Gao, K. Xue, Shun Zhang, J. Liao, Ting Wang, Ruize Hou, Fuming Kuang
ABSTRACT The vibration induced by the seedling pushing device in the transplanting mechanism gravely undermines the transplanting performance. In this study, the structure and working process of the transplanting mechanism were analyzed. Then, an orthogonal test design for optimizing the vibration performance of the transplanting mechanism was applied to determine the optimum operating speed, counterweight mass, and spring stiffness. The parameter optimization results were finally verified by planting quality simulation and bench test. The result shows that when the operating speed was 250.0 r/min, the counterweight mass was 0.9 kg, and the spring stiffness was 140.0 N/m, the mechanism’s working performance and planting effect were the best. According to the analysis of data collected by the sensor, the maximum stress value was 6.05 MPa (reduced by 18.8%), the perpendicularity was 93.58% (increased by 6.0%), and the coefficient of speed fluctuation was 3.16 (diminished by 28.7%), which effectively reduces the force of the transplanting mechanism on the seedlings and improves the quality of operation.
{"title":"Vibration analysis and parameter optimization of seedling pushing device of transplanting mechanism with planetary elliptic gears","authors":"Dequan Zhu, Kejie Gao, K. Xue, Shun Zhang, J. Liao, Ting Wang, Ruize Hou, Fuming Kuang","doi":"10.1080/02533839.2022.2161945","DOIUrl":"https://doi.org/10.1080/02533839.2022.2161945","url":null,"abstract":"ABSTRACT The vibration induced by the seedling pushing device in the transplanting mechanism gravely undermines the transplanting performance. In this study, the structure and working process of the transplanting mechanism were analyzed. Then, an orthogonal test design for optimizing the vibration performance of the transplanting mechanism was applied to determine the optimum operating speed, counterweight mass, and spring stiffness. The parameter optimization results were finally verified by planting quality simulation and bench test. The result shows that when the operating speed was 250.0 r/min, the counterweight mass was 0.9 kg, and the spring stiffness was 140.0 N/m, the mechanism’s working performance and planting effect were the best. According to the analysis of data collected by the sensor, the maximum stress value was 6.05 MPa (reduced by 18.8%), the perpendicularity was 93.58% (increased by 6.0%), and the coefficient of speed fluctuation was 3.16 (diminished by 28.7%), which effectively reduces the force of the transplanting mechanism on the seedlings and improves the quality of operation.","PeriodicalId":17313,"journal":{"name":"Journal of the Chinese Institute of Engineers","volume":"12 1","pages":"154 - 162"},"PeriodicalIF":1.1,"publicationDate":"2023-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82572617","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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