Pub Date : 2022-10-01DOI: 10.1109/WCEEA56458.2022.00026
Cheng Xu, Jianhua Xiang, Jian Liu, Kuan Liu, Xiangning Du
The crankshaft system equivalent test bench can effectively solve the problems of long test period, high cost, and inconvenient testing operations in the bench of the traditional single-cylinder original engine. In this paper, a crankshaft system equivalent test bench of single-cylinder engines was designed, taking a servo motor as the power unit, the double-crank connecting rod and double-head cylinder as the transmission mechanism. Comparison and demonstration are carried out through dynamic simulation and kinematics/ kinematic characteristics of the original single-cylinder engine. The results show that the equivalent test bench can simulate the rotation state of the crankshaft during the acceleration stage and the stable rotation stage. The simulation results are in line with the piston displacement, velocity and acceleration change law, and kinematic characteristics of single-cylinder engines, meeting the equivalence requirements.
{"title":"Design and Simulation Demonstration of the Electrically-driven Crankshaft System Equivalent Test Bench","authors":"Cheng Xu, Jianhua Xiang, Jian Liu, Kuan Liu, Xiangning Du","doi":"10.1109/WCEEA56458.2022.00026","DOIUrl":"https://doi.org/10.1109/WCEEA56458.2022.00026","url":null,"abstract":"The crankshaft system equivalent test bench can effectively solve the problems of long test period, high cost, and inconvenient testing operations in the bench of the traditional single-cylinder original engine. In this paper, a crankshaft system equivalent test bench of single-cylinder engines was designed, taking a servo motor as the power unit, the double-crank connecting rod and double-head cylinder as the transmission mechanism. Comparison and demonstration are carried out through dynamic simulation and kinematics/ kinematic characteristics of the original single-cylinder engine. The results show that the equivalent test bench can simulate the rotation state of the crankshaft during the acceleration stage and the stable rotation stage. The simulation results are in line with the piston displacement, velocity and acceleration change law, and kinematic characteristics of single-cylinder engines, meeting the equivalence requirements.","PeriodicalId":143024,"journal":{"name":"2022 International Conference on Wireless Communications, Electrical Engineering and Automation (WCEEA)","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127248369","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 : 2022-10-01DOI: 10.1109/WCEEA56458.2022.00068
Jianhua Xiang, Cheng-jia Zhong, Kaicheng Li
The impact produced when the bubble on the main bearing wall of an internal combustion engine is an important factor causing cavitation failure. Based on the average Reynolds equation of lubricating oil and the energy of cavitation collapse, the thermoelastic fluid dynamics (TEHD) model of the main bearing and the bubble collapse Volume of Fluid (VOF) model in the oil film attached to the bearing wall were established, the load and flow field distribution when the bubble collapses were analyzed, and the impact characteristics on the bearing wall when the bubble collapses were explored. The results show that: when the bubble collapses, it begins to sag from the top until it ruptures to form two bubbles; and within a very short period of time when the bubble collapses, the pressure of the top jet on the wall can reach 31MPa and above.
{"title":"A Study on the characteristics of the impact produced when the bubble on the crankshaft's main bearing ball collapses","authors":"Jianhua Xiang, Cheng-jia Zhong, Kaicheng Li","doi":"10.1109/WCEEA56458.2022.00068","DOIUrl":"https://doi.org/10.1109/WCEEA56458.2022.00068","url":null,"abstract":"The impact produced when the bubble on the main bearing wall of an internal combustion engine is an important factor causing cavitation failure. Based on the average Reynolds equation of lubricating oil and the energy of cavitation collapse, the thermoelastic fluid dynamics (TEHD) model of the main bearing and the bubble collapse Volume of Fluid (VOF) model in the oil film attached to the bearing wall were established, the load and flow field distribution when the bubble collapses were analyzed, and the impact characteristics on the bearing wall when the bubble collapses were explored. The results show that: when the bubble collapses, it begins to sag from the top until it ruptures to form two bubbles; and within a very short period of time when the bubble collapses, the pressure of the top jet on the wall can reach 31MPa and above.","PeriodicalId":143024,"journal":{"name":"2022 International Conference on Wireless Communications, Electrical Engineering and Automation (WCEEA)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125732148","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 : 2022-10-01DOI: 10.1109/WCEEA56458.2022.00063
Jing Shi, Jun Yang, Long Wen, Junqing Shen, Guanglei Che, Songxuan Li
In the process of low voltage crossing of photovoltaic grid-connected power generation system, the traditional three-phase phase-locked loop cannot accurately lock the phase when the grid fault occurs. Aiming at the deficiency that the filtering ability of traditional complex filter (CCF) cannot meet the requirements of power grid, this paper proposes a three-phase voltage phase-locked loop structure based on second-order generalized integrator (SOGI), and optimizes the signal quality before entering the phase-locked loop. In the simulation, the phase-locking effect and the acquisition ability of positive and negative sequence components of the improved PLL are verified respectively, and the effectiveness of the proposed structure is verified.
{"title":"Research on Filter Enhanced Phase Locked Loop based on Multiple Second Order Generalized Integrator","authors":"Jing Shi, Jun Yang, Long Wen, Junqing Shen, Guanglei Che, Songxuan Li","doi":"10.1109/WCEEA56458.2022.00063","DOIUrl":"https://doi.org/10.1109/WCEEA56458.2022.00063","url":null,"abstract":"In the process of low voltage crossing of photovoltaic grid-connected power generation system, the traditional three-phase phase-locked loop cannot accurately lock the phase when the grid fault occurs. Aiming at the deficiency that the filtering ability of traditional complex filter (CCF) cannot meet the requirements of power grid, this paper proposes a three-phase voltage phase-locked loop structure based on second-order generalized integrator (SOGI), and optimizes the signal quality before entering the phase-locked loop. In the simulation, the phase-locking effect and the acquisition ability of positive and negative sequence components of the improved PLL are verified respectively, and the effectiveness of the proposed structure is verified.","PeriodicalId":143024,"journal":{"name":"2022 International Conference on Wireless Communications, Electrical Engineering and Automation (WCEEA)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129229054","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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