Pub Date : 2022-11-18DOI: 10.1109/WCMEIM56910.2022.10021356
Shuqi Niu, Zhao Zhang, Xintong Tian, Xueyan Zhao
The improved kernel fuzzy clustering method is used to classify the load data of the smart grid accurately. It lays a good foundation for the subsequent work of power load forecasting and provides a more efficient, safe, and reliable direction for the operation of the power system. Firstly, the collected power load data is preprocessed to reduce data redundancy and improve data quality. Secondly, the kernel fuzzy C-means clustering algorithm based on particle swarm optimization is used to cluster the load data with the same power consumption characteristics. Finally, the improved kernel fuzzy clustering method is compared with the fuzzy C-means clustering method through a simulation example to verify the effectiveness of this method.
{"title":"Improved Kernel Fuzzy C-Means Clustering Method Based on Smart Grid","authors":"Shuqi Niu, Zhao Zhang, Xintong Tian, Xueyan Zhao","doi":"10.1109/WCMEIM56910.2022.10021356","DOIUrl":"https://doi.org/10.1109/WCMEIM56910.2022.10021356","url":null,"abstract":"The improved kernel fuzzy clustering method is used to classify the load data of the smart grid accurately. It lays a good foundation for the subsequent work of power load forecasting and provides a more efficient, safe, and reliable direction for the operation of the power system. Firstly, the collected power load data is preprocessed to reduce data redundancy and improve data quality. Secondly, the kernel fuzzy C-means clustering algorithm based on particle swarm optimization is used to cluster the load data with the same power consumption characteristics. Finally, the improved kernel fuzzy clustering method is compared with the fuzzy C-means clustering method through a simulation example to verify the effectiveness of this method.","PeriodicalId":202270,"journal":{"name":"2022 5th World Conference on Mechanical Engineering and Intelligent Manufacturing (WCMEIM)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123337501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-18DOI: 10.1109/WCMEIM56910.2022.10021492
K. Wang, Zhen He, Chengyang Wu, Fufu Yang, Jun Zhang
Dynamic modelling and analysis are the basis for precise control of mechanical devices. The present aims to provide a dynamic modelling methodology for redundantly actuated parallel spindle head. For this purpose, a novel redundantly actuated parallel spindle head is taken as an example to demonstrate the modelling process. Firstly, the structure of novel redundantly actuated parallel spindle head is described to reveal its topology of 2PRU &(2PRU)R parallel mechanism. Secondly, a close-loop-based kinematic model is constructed to provide kinematic foundation for further dynamic modelling. Thirdly, a comprehensive dynamic model is established by using the principle of virtual work. Based on the established model, the actuated forces are predicted and further optimized by the least 2-norm criterion. Finally, some numerical simulations are carried out to verify the proposed dynamic modelling methodology. The good agreement between the theoretical and numerical results proves the effectiveness of the proposed dynamic model.
{"title":"Dynamic Modelling and Analysis of a Novel Redundantly Actuated Parallel Spindle Head","authors":"K. Wang, Zhen He, Chengyang Wu, Fufu Yang, Jun Zhang","doi":"10.1109/WCMEIM56910.2022.10021492","DOIUrl":"https://doi.org/10.1109/WCMEIM56910.2022.10021492","url":null,"abstract":"Dynamic modelling and analysis are the basis for precise control of mechanical devices. The present aims to provide a dynamic modelling methodology for redundantly actuated parallel spindle head. For this purpose, a novel redundantly actuated parallel spindle head is taken as an example to demonstrate the modelling process. Firstly, the structure of novel redundantly actuated parallel spindle head is described to reveal its topology of 2PRU &(2PRU)R parallel mechanism. Secondly, a close-loop-based kinematic model is constructed to provide kinematic foundation for further dynamic modelling. Thirdly, a comprehensive dynamic model is established by using the principle of virtual work. Based on the established model, the actuated forces are predicted and further optimized by the least 2-norm criterion. Finally, some numerical simulations are carried out to verify the proposed dynamic modelling methodology. The good agreement between the theoretical and numerical results proves the effectiveness of the proposed dynamic model.","PeriodicalId":202270,"journal":{"name":"2022 5th World Conference on Mechanical Engineering and Intelligent Manufacturing (WCMEIM)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122119164","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-18DOI: 10.1109/WCMEIM56910.2022.10021383
Qing Zhu, Yitian Li, Qingyun Liu, Mengqian Tian
Considering the drawbacks of existing soft actuators used in narrow unstructured space, such as lower expansion ratio and smaller driving force, a soft actuator with high stretch-draw ratio is designed in this paper. Based on TPU(Thermoplastic polyurethanes) airbags, the actuator is designed by the use of nested structure combined with rope mechanism, which achieves a large expansion ratio (115%) on the premise of ensuring the rest size of the actuator. Then, according to the structural characteristics of the actuator, the static driving characteristics of TPU airbag and rope mechanism of the actuator are deduced by analytical and geometric methods. So the static model of output force of the actuator is obtained. Finally, a modeling method of using displacement-driven variable load instead of rope mechanism to construct simulation model is proposed. This research lays the foundation for the follow-up study of the actuator's dynamic characteristics and control strategy.
{"title":"Design and Analysis of a Novel Soft Actuator with High Contraction Ratio Based on Nested Structure","authors":"Qing Zhu, Yitian Li, Qingyun Liu, Mengqian Tian","doi":"10.1109/WCMEIM56910.2022.10021383","DOIUrl":"https://doi.org/10.1109/WCMEIM56910.2022.10021383","url":null,"abstract":"Considering the drawbacks of existing soft actuators used in narrow unstructured space, such as lower expansion ratio and smaller driving force, a soft actuator with high stretch-draw ratio is designed in this paper. Based on TPU(Thermoplastic polyurethanes) airbags, the actuator is designed by the use of nested structure combined with rope mechanism, which achieves a large expansion ratio (115%) on the premise of ensuring the rest size of the actuator. Then, according to the structural characteristics of the actuator, the static driving characteristics of TPU airbag and rope mechanism of the actuator are deduced by analytical and geometric methods. So the static model of output force of the actuator is obtained. Finally, a modeling method of using displacement-driven variable load instead of rope mechanism to construct simulation model is proposed. This research lays the foundation for the follow-up study of the actuator's dynamic characteristics and control strategy.","PeriodicalId":202270,"journal":{"name":"2022 5th World Conference on Mechanical Engineering and Intelligent Manufacturing (WCMEIM)","volume":"108 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113969411","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-18DOI: 10.1109/WCMEIM56910.2022.10021417
Yuanhao Hu, Lei Xu, Junbai Zhong, Han Gao, Zongliang Mou
Aiming at the problems of low production efficiency and high manufacturing cost caused by the disorder of order sorting in manufacturing enterprises. This paper presents an improved Delphi-AHP-TOPSIS method. Firstly, Delphi method is used to determine the main evaluation criteria and sub-criterion by experts. Secondly, the analytic hierarchy process (AHP) is used to compare each index. After that, the relative weight of the criteria is determined through the subjective judgment of many expert. Thirdly, the decision-making scheme is scored and ranked based on the technique for order preference by similarity to ideal solution (TOPSIS). Finally, the improved method is compared with the single AHP or TOPSIS method by introducing the adjacent scheme differentiation method. The simulation results have shown that the improved Delphi-AHP-TOPSIS method proposed in this paper can effectively guide manufacturing enterprises to make order priority decisions.
{"title":"Order Priority Decision of Manufacturing Enterprises: An Improved Delphi-AHP-TOPSIS Methodology","authors":"Yuanhao Hu, Lei Xu, Junbai Zhong, Han Gao, Zongliang Mou","doi":"10.1109/WCMEIM56910.2022.10021417","DOIUrl":"https://doi.org/10.1109/WCMEIM56910.2022.10021417","url":null,"abstract":"Aiming at the problems of low production efficiency and high manufacturing cost caused by the disorder of order sorting in manufacturing enterprises. This paper presents an improved Delphi-AHP-TOPSIS method. Firstly, Delphi method is used to determine the main evaluation criteria and sub-criterion by experts. Secondly, the analytic hierarchy process (AHP) is used to compare each index. After that, the relative weight of the criteria is determined through the subjective judgment of many expert. Thirdly, the decision-making scheme is scored and ranked based on the technique for order preference by similarity to ideal solution (TOPSIS). Finally, the improved method is compared with the single AHP or TOPSIS method by introducing the adjacent scheme differentiation method. The simulation results have shown that the improved Delphi-AHP-TOPSIS method proposed in this paper can effectively guide manufacturing enterprises to make order priority decisions.","PeriodicalId":202270,"journal":{"name":"2022 5th World Conference on Mechanical Engineering and Intelligent Manufacturing (WCMEIM)","volume":"129 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122893600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-18DOI: 10.1109/WCMEIM56910.2022.10021493
Cheng-Cheng Li, Q. Bi
The quality of the bracket assembly is an important guarantee for the successful launch of the rocket. The assembly accuracy of the bracket installed inside rockets is affected by bracket pose estimation, robot grasping, and positioning. We have proposed a recognition and pose estimation algorithm that integrates 2D and 3D vision to improve the bracket assembly accuracy. A position-based visual servo bracket grasping method is used to avoid the poor absolute positioning accuracy of the industrial robot. Then a small field-of-view vision system was established to achieve precise positioning of the bracket. We also developed a quick and precise hole detection algorithm based on YOLOv5 and caliper vision operator to compensate for the absolute positioning error of industrial robots. With the help of a vision servo grasping strategy and high precision re-positioning algorithm, the bracket's assembly hole positioning accuracy can finally reach 0.05mm. It is worth mentioning that the methods proposed in this paper have been successfully applied in the flexible automatic assembly line of the brackets used in rockets.
{"title":"Vision-driven High Precision Positioning Method for Bracket Assembly with Industrial Robot","authors":"Cheng-Cheng Li, Q. Bi","doi":"10.1109/WCMEIM56910.2022.10021493","DOIUrl":"https://doi.org/10.1109/WCMEIM56910.2022.10021493","url":null,"abstract":"The quality of the bracket assembly is an important guarantee for the successful launch of the rocket. The assembly accuracy of the bracket installed inside rockets is affected by bracket pose estimation, robot grasping, and positioning. We have proposed a recognition and pose estimation algorithm that integrates 2D and 3D vision to improve the bracket assembly accuracy. A position-based visual servo bracket grasping method is used to avoid the poor absolute positioning accuracy of the industrial robot. Then a small field-of-view vision system was established to achieve precise positioning of the bracket. We also developed a quick and precise hole detection algorithm based on YOLOv5 and caliper vision operator to compensate for the absolute positioning error of industrial robots. With the help of a vision servo grasping strategy and high precision re-positioning algorithm, the bracket's assembly hole positioning accuracy can finally reach 0.05mm. It is worth mentioning that the methods proposed in this paper have been successfully applied in the flexible automatic assembly line of the brackets used in rockets.","PeriodicalId":202270,"journal":{"name":"2022 5th World Conference on Mechanical Engineering and Intelligent Manufacturing (WCMEIM)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123861392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Near-surface nitrogen dioxide NO2 concentration is an essential indicator for ambient air quality monitoring. In this study, the extreme gradient boosting (XGBoost) algorithm and random forest algorithm in machine learning are used to combine the TROPOspheric Monitoring Instrument(TROPOMI) high-resolution remote sensing images, meteorological and other auxiliary data with ground-level NO2 concentration monitoring data (including national and provincial control stations) to construct a dataset of estimation samples and conduct research on estimating the near-surface NO2 concentration on a grid with a spatial precision of 0.05° in Sichuan Province. According to the ten-fold cross-validation results of the test and training sets, the XGBoost model has better accuracy and generalization performance (R2=0.875, RMSE=4.774 ug/m3), In addition, SHapley Additive exPlanation(SHAP) was employed after its development, which showed that TROPOMI satellite data contributed the most to the near-surface NO2 estimation. By contrasting the results with the data set using only national control stations, we can see that after including the atmospheric monitoring data from provincial control stations, the estimated NO2 concentration near the ground is more consistent with the data distribution of ground monitoring stations. Moreover, the spatial distribution of concentration is more continuous and homogeneous, providing essential support for local governments to regulate the atmospheric environment precisely.
{"title":"Estimation of near-surface NO2 based on TROPOMI and provincial control stations' data using machine learning","authors":"F. Deng, Yijian Chen, Lanhui Li, Cong Wang, Luwei Cao, Chaofeng Peng","doi":"10.1109/WCMEIM56910.2022.10021549","DOIUrl":"https://doi.org/10.1109/WCMEIM56910.2022.10021549","url":null,"abstract":"Near-surface nitrogen dioxide NO2 concentration is an essential indicator for ambient air quality monitoring. In this study, the extreme gradient boosting (XGBoost) algorithm and random forest algorithm in machine learning are used to combine the TROPOspheric Monitoring Instrument(TROPOMI) high-resolution remote sensing images, meteorological and other auxiliary data with ground-level NO2 concentration monitoring data (including national and provincial control stations) to construct a dataset of estimation samples and conduct research on estimating the near-surface NO2 concentration on a grid with a spatial precision of 0.05° in Sichuan Province. According to the ten-fold cross-validation results of the test and training sets, the XGBoost model has better accuracy and generalization performance (R2=0.875, RMSE=4.774 ug/m3), In addition, SHapley Additive exPlanation(SHAP) was employed after its development, which showed that TROPOMI satellite data contributed the most to the near-surface NO2 estimation. By contrasting the results with the data set using only national control stations, we can see that after including the atmospheric monitoring data from provincial control stations, the estimated NO2 concentration near the ground is more consistent with the data distribution of ground monitoring stations. Moreover, the spatial distribution of concentration is more continuous and homogeneous, providing essential support for local governments to regulate the atmospheric environment precisely.","PeriodicalId":202270,"journal":{"name":"2022 5th World Conference on Mechanical Engineering and Intelligent Manufacturing (WCMEIM)","volume":"212 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124172138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-18DOI: 10.1109/WCMEIM56910.2022.10021497
FanFan, Yan Rong
In the product lifecycle, there exist multi-view Boms for different departments and functions. Each department in the custom when the BOM is not a unified specification design and management, and for different products of different enterprise each department involved in custom BOM. BOM attribute column is also a dynamic variable, most enterprises for BOM custom is still adopt the way of print before the department and the department of information sharing. Therefore, this paper proposes a concept of super BOM table, which can dynamically generate each business BOM table to meet the customization requirements of each department for BOM table. In addition, this paper also designs a super BOM creation platform based on B/S architecture to realize the paperless management of BOM., and proposes a new database access development mode for dynamic table building behavior. The last part of the article takes the machine tool product of A company as an example to test the related functions of the web platform. Practice has proved that the design and implementation of super-BOM based on dynamic library table makes the way of customized BOM more standardized and convenient, realizes the paperless management of BOM information, and greatly improves the management level of BOM table in enterprises.
{"title":"Design and implementation of super BOM based on dynamic library table","authors":"FanFan, Yan Rong","doi":"10.1109/WCMEIM56910.2022.10021497","DOIUrl":"https://doi.org/10.1109/WCMEIM56910.2022.10021497","url":null,"abstract":"In the product lifecycle, there exist multi-view Boms for different departments and functions. Each department in the custom when the BOM is not a unified specification design and management, and for different products of different enterprise each department involved in custom BOM. BOM attribute column is also a dynamic variable, most enterprises for BOM custom is still adopt the way of print before the department and the department of information sharing. Therefore, this paper proposes a concept of super BOM table, which can dynamically generate each business BOM table to meet the customization requirements of each department for BOM table. In addition, this paper also designs a super BOM creation platform based on B/S architecture to realize the paperless management of BOM., and proposes a new database access development mode for dynamic table building behavior. The last part of the article takes the machine tool product of A company as an example to test the related functions of the web platform. Practice has proved that the design and implementation of super-BOM based on dynamic library table makes the way of customized BOM more standardized and convenient, realizes the paperless management of BOM information, and greatly improves the management level of BOM table in enterprises.","PeriodicalId":202270,"journal":{"name":"2022 5th World Conference on Mechanical Engineering and Intelligent Manufacturing (WCMEIM)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124222780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-18DOI: 10.1109/WCMEIM56910.2022.10021511
F. Chen, Jielin Deng
This paper presents an image stitching method of BGA component for industrial operation. The mounter is the core equipment of the surface mount system, and it currently has no way to place components larger than the camera's field of view. Therefore, a high-speed image stitching method of BGA component is still not available. In this method, the hu invariant moment is used to determine the overlapping area of the image and reduce the range of feature point extraction. After obtaining the feature points, the differences between the SIFT (Scale Invariant Features Transform) algorithm, the SURF (Speeded Up Robust Features) algorithm and the improved SURF algorithm are compared. The improved SURF algorithm combines the SURF feature extraction method and the FREAK (Fast Retina Keypoint) descriptor is developed. After the feature points are processed by BFMather matching and RANSAC algorithm, the image transformation matrix of the two images is calculated. Finally, the perspective transformation is performed on the image to complete the image stitching. This image stitching method is shown to be simple and effective for high-speed industrial application. The procedure taken can be extended to other similar IC component and to other machine.
{"title":"An Improved SURF Algorithm with FREAK Descriptor for BGA Component Image Stitching","authors":"F. Chen, Jielin Deng","doi":"10.1109/WCMEIM56910.2022.10021511","DOIUrl":"https://doi.org/10.1109/WCMEIM56910.2022.10021511","url":null,"abstract":"This paper presents an image stitching method of BGA component for industrial operation. The mounter is the core equipment of the surface mount system, and it currently has no way to place components larger than the camera's field of view. Therefore, a high-speed image stitching method of BGA component is still not available. In this method, the hu invariant moment is used to determine the overlapping area of the image and reduce the range of feature point extraction. After obtaining the feature points, the differences between the SIFT (Scale Invariant Features Transform) algorithm, the SURF (Speeded Up Robust Features) algorithm and the improved SURF algorithm are compared. The improved SURF algorithm combines the SURF feature extraction method and the FREAK (Fast Retina Keypoint) descriptor is developed. After the feature points are processed by BFMather matching and RANSAC algorithm, the image transformation matrix of the two images is calculated. Finally, the perspective transformation is performed on the image to complete the image stitching. This image stitching method is shown to be simple and effective for high-speed industrial application. The procedure taken can be extended to other similar IC component and to other machine.","PeriodicalId":202270,"journal":{"name":"2022 5th World Conference on Mechanical Engineering and Intelligent Manufacturing (WCMEIM)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124234109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-18DOI: 10.1109/WCMEIM56910.2022.10021489
Wang Wan-lin
The third stage cyclone (TTS) in the catalytic cracking device is the pivotal part to separate and recover catalyst particles, and it can ensure the normal operation of follow-up process. Internal flow patterns in it are particularly important for the selection and use of the equipment. In this paper, the structure parameters of the PV third stage cyclone of 2.8 million tons/year catalytic cracking device in a chemical plant are determined. Simulation of the turbulent 3D flow has been done with Reynolds stress model (RSM) and discrete phase model (DPM). Velocity and pressure drop patterns in the cyclone, effects of the inlet duct dimension on the separation performance and pressure drop, and the motion and separation efficiency of different diameter particles were analyzed. The results indicate that the flow field inside the cyclone forms a typical Rankin vortex flow pattern, and simulated pressure drops agree well with experimental results, which validates the numerical simulation method. When the inlet area is unchanged, the separation efficiencies first increase and then decrease with the increase of inlet height, and the optimal ratio of inlet height to cyclone's body diameter is 0.58. The migration trajectory of small particles have great randomness, and they are easy to escape from the vortex finder affected by the gas flow. The large particles rotate along the relatively large diameter and can be separated well. These results can provide the reference for the flow mechanism analysis and the industrial application of TTS.
{"title":"Research on Structure Optimization and Internal flow of Cyclone in Catalytic Cracking Device","authors":"Wang Wan-lin","doi":"10.1109/WCMEIM56910.2022.10021489","DOIUrl":"https://doi.org/10.1109/WCMEIM56910.2022.10021489","url":null,"abstract":"The third stage cyclone (TTS) in the catalytic cracking device is the pivotal part to separate and recover catalyst particles, and it can ensure the normal operation of follow-up process. Internal flow patterns in it are particularly important for the selection and use of the equipment. In this paper, the structure parameters of the PV third stage cyclone of 2.8 million tons/year catalytic cracking device in a chemical plant are determined. Simulation of the turbulent 3D flow has been done with Reynolds stress model (RSM) and discrete phase model (DPM). Velocity and pressure drop patterns in the cyclone, effects of the inlet duct dimension on the separation performance and pressure drop, and the motion and separation efficiency of different diameter particles were analyzed. The results indicate that the flow field inside the cyclone forms a typical Rankin vortex flow pattern, and simulated pressure drops agree well with experimental results, which validates the numerical simulation method. When the inlet area is unchanged, the separation efficiencies first increase and then decrease with the increase of inlet height, and the optimal ratio of inlet height to cyclone's body diameter is 0.58. The migration trajectory of small particles have great randomness, and they are easy to escape from the vortex finder affected by the gas flow. The large particles rotate along the relatively large diameter and can be separated well. These results can provide the reference for the flow mechanism analysis and the industrial application of TTS.","PeriodicalId":202270,"journal":{"name":"2022 5th World Conference on Mechanical Engineering and Intelligent Manufacturing (WCMEIM)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125570086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-18DOI: 10.1109/WCMEIM56910.2022.10021460
Ren Yu-gang, Zhang Han-Bin, Shi Xian-peng
Aimed at the practical application problems of droppable ballast device, Through the design method of ergonomics and closely combining with the practical application, Carrying out the optimization and research of droppable ballast device base on the “JIAOLONG” Manned Submersible. On the basis of analyzing the application of typical characteristics of droppable ballast device in China and overseas, especially for the working condition and structural characteristics of “JIAOLONG” Manned Submersible, We carried out the design improvements, And the introduction of CAD / CAM / CAE technology in the design of computer-aided design, Finally, the key components are analyzed and studied. It has important practical significance through optimization of key technologies and equipment designed to operate on the body of the “JIAOLONG” manned submersibles to carry out
{"title":"The Research of Droppable Ballast Device of Manned Submersible based on Computer-aided Ergonomics design","authors":"Ren Yu-gang, Zhang Han-Bin, Shi Xian-peng","doi":"10.1109/WCMEIM56910.2022.10021460","DOIUrl":"https://doi.org/10.1109/WCMEIM56910.2022.10021460","url":null,"abstract":"Aimed at the practical application problems of droppable ballast device, Through the design method of ergonomics and closely combining with the practical application, Carrying out the optimization and research of droppable ballast device base on the “JIAOLONG” Manned Submersible. On the basis of analyzing the application of typical characteristics of droppable ballast device in China and overseas, especially for the working condition and structural characteristics of “JIAOLONG” Manned Submersible, We carried out the design improvements, And the introduction of CAD / CAM / CAE technology in the design of computer-aided design, Finally, the key components are analyzed and studied. It has important practical significance through optimization of key technologies and equipment designed to operate on the body of the “JIAOLONG” manned submersibles to carry out","PeriodicalId":202270,"journal":{"name":"2022 5th World Conference on Mechanical Engineering and Intelligent Manufacturing (WCMEIM)","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126388538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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