EEA - Electrotehnica, Electronica, Automatica最新文献

{"title":"Lightweight Design of Patch Plate on Car-body B-pillar based on Side Impact Safety","authors":"Wei Zhang","doi":"10.46904/eea.21.69.4.1108004","DOIUrl":"https://doi.org/10.46904/eea.21.69.4.1108004","url":null,"abstract":"The B-pillar of automobile needs to meet the requirements of vehicle strength and rigidity, and also consider the fuel economy of vehicle. Therefore, the design and development of B-pillar is a difficult point in the field of car body design and manufacturing. Based on the side impact regulations, the safety model ling and simulation analysis of the B-pillar of the vehicle was carried out to obtain the change law of the intrusion amount and the intrusion speed of the five key points in the whole process. According to the analysis results of side impact of B-pillar, a scheme to reduce the material thickness of B-pillar body and increase patch plate for lightweight design was proposed, and a comparative analysis of the safety of side impact was made. In view of the problem that the intrusion of B-pillar of a real vehicle model did not conform to the regulations, the design scheme of adding patch plate was proposed to improve the safety of side impact. According to the actual collision results, the simulation model was modified, and the design scheme was simulated and optimized. The reliability of the design scheme was verified by the real vehicle collision analysis. The results show that: in the side collision of B-pillar, the intrusion of D2 position measurement point is the largest, the intrusion velocity of D3 position measurement point is the largest, and the intrusion amount and intrusion speed of D5 position measurement point are the smallest. Patch plates are added to the inner side of adjacent area of D2 position measurement point. The welding point is welded with B-pillar structure, and other areas of B-pillar keep the same structure, so as to realize lightweight and effective improvement of safety. Under the condition of maintaining the original material and thickness of B-pillar, two patches with thickness of 2 mm and material of B340LA are added in the middle of B-pillar to improve the structural strength. The defect area is set at the wrinkle position of the original B-pillar to guide the deformation mode of the B-pillar. The relative deviation between simulation calculation and test intrusion is less than 20 %, and the car crash simulation model with improved B-pillar structure is more accurate. For this type of car, the optimization and improvement effect of B-pillar structure is ideal, which improves the passenger safety protection ability in side impact.","PeriodicalId":38292,"journal":{"name":"EEA - Electrotehnica, Electronica, Automatica","volume":"49 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82745392","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}

{"title":"Weight Coefficient Setting of Current Predictive Control for Permanent Magnet Synchronous Machine using HPSO","authors":"Yi Luo, Fengyang Gao, Kaiwen Yang","doi":"10.46904/eea.21.69.4.1108002","DOIUrl":"https://doi.org/10.46904/eea.21.69.4.1108002","url":null,"abstract":"Aiming at the problem of multi-objective weight coefficient setting of model predictive control (MPC) for permanent magnet synchronous motor (PMSM), a hybrid particle swarm optimization (HPSO) algorithm with low computational complexity of fitness value is proposed to realize the self-setting of weight coefficient of cost function. In the proposed strategy, good particles update velocity and position through particle swarm optimization (PSO) algorithm, while bad particles not only do the same but generate the offspring by cross and mutation, and then the worse offspring will be replaced by their extremum individuals. It is faster that the adaptive cross and mutation rate makes the offspring get closer to the good particles, and it increases the diversity of particles without destroying the good particles. Experimental results show that compared with other optimization algorithms, the proposed algorithm. Firstly, is more inclined to escape from the local optimum. Secondly, it has higher search accuracy and faster convergence speed. Moreover, with setting weight coefficient, the system speed regulation time is shortened, the current total harmonic distortion (THD) is reduced significantly, and the switching frequency is effectively reduced without affecting the output power quality.","PeriodicalId":38292,"journal":{"name":"EEA - Electrotehnica, Electronica, Automatica","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78142867","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}

{"title":"Status and Trends of Power Devices","authors":"Titu-Marius I. Băjenescu","doi":"10.46904/eea.21.69.4.1108008","DOIUrl":"https://doi.org/10.46904/eea.21.69.4.1108008","url":null,"abstract":"Advances in power semiconductor technology have improved the efficiency, size, weight, and cost of power electronic systems. Power integrated circuits have been developed for the use of power converters for portable, automotive and aerospace applications. New materials (SiC and GaN) have been introduced for advanced applications. They increase the output power density per area or per volume, reduce the consumption of natural resources, and increase the efficiency of electric systems. Especially the effects of SiC devices are dramatic. The paper reviews the state of these devices in terms of higher voltages, higher power density, and better switching performance.","PeriodicalId":38292,"journal":{"name":"EEA - Electrotehnica, Electronica, Automatica","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73084752","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}

{"title":"A Hybrid Model of Photovoltaic Power Stations for Model Ling Tasks of Large Power Systems","authors":"N. Ruban, V. Rudnik, I. Razzhivin, A. Kievec","doi":"10.46904/eea.21.69.4.1108005","DOIUrl":"https://doi.org/10.46904/eea.21.69.4.1108005","url":null,"abstract":"Renewable energy sources are being actively penetrated in the global energy sector, with the main growth being achieved by new photovoltaic power stations. At the same time, the influence of photovoltaic power stations on the operation of power systems is known. This is primarily due to the inconstancy of the weather, which leads to a decrease in the output of each specific photovoltaic panel and power station as a whole. To study the effect of partial shading of photovoltaic panels on the parameters of its operation, various models of the current-voltage characteristics of photovoltaic cells are used in the world, while detailed two-diode models show the best results. The use of detailed models allows to get complete information about the processes in a variety of photovoltaic panels of a power station, as well as other elements of it, such as a voltage converter. This makes it possible to assess the impact of these processes on the external power system. However, for detailed modelling of large photovoltaic power stations as part of power systems, it is necessary to use powerful software and hardware systems. Such systems include the Hybrid real-time power system simulator. This simulator is a multiprocessor installation that provides a solution to the aggregate model of the power system through the use of three approaches to modelling: digital, analogue and physical. The article presents the results of experimental studies of software and hardware tools for modelling a photovoltaic power station, developed on the basis of a hybrid approach to modelling electric power systems.","PeriodicalId":38292,"journal":{"name":"EEA - Electrotehnica, Electronica, Automatica","volume":"115 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82726195","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}

{"title":"Comparative Analysis of Line-start Synchronous Motor and Asynchronous Motor","authors":"V. Šarac","doi":"10.46904/EEA.21.69.1.1108002","DOIUrl":"https://doi.org/10.46904/EEA.21.69.1.1108002","url":null,"abstract":"Energy efficient motors are the key components of each industrial process. In the energy demanding society, requiring the energy efficient consumers, the line-start synchronous motor has gained more and more popularity due to the high efficiency and power factor combined with good operational characteristics. The disadvantages of the synchronous motors such as inability of starting without the inverter has been largely overcame with this type of the motor. However, the proper design of line-start motor regarding permanent magnets and the squirrel cage winding is crucial for motor starting and synchronization capability. In this paper, the line-start synchronous motor is derived from the asynchronous motor by redesigning the rotor. The obtained performance characteristics of the synchronous motor is compared with the data of the asynchronous motor (the analytical, measurements and from the motor producer) and they show reasonable agreement. The derived model of the synchronous motor is numerically modelled for obtaining the magnetic flux density distribution in the motor cross-section. The analysis and comparison is completed by obtaining the transient characteristics of both types of the motors. The designed synchronous motor has proven to have good starting and synchronization capabilities combined with the high efficiency. The dynamic response at sudden load changes is within expected limits.","PeriodicalId":38292,"journal":{"name":"EEA - Electrotehnica, Electronica, Automatica","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86536441","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}

{"title":"The Energy Efficiency of Domestic Wastewater Treatment Processes: Case Analysis","authors":"Csaba Bartha, Monica Jipa, D. Ignat, Attila Tókos, I. Lingvay","doi":"10.46904/eea.20.68.4.1108004","DOIUrl":"https://doi.org/10.46904/eea.20.68.4.1108004","url":null,"abstract":"T he energy efficiency of the domestic wastewater treatment process was evaluated by monitoring and recording the operating parameters of a wastewater treatment plant and processing the acquired data. Following the comparative analysis of the recorded data in a winter and in a summer month, it was found that the specific electricity consumption in the winter month (1,818 kWh/m3) was approx. 5.57% higher than the one registered in the summer month (9297 kWh/ m3), which is explained by the difference of approx. 8º C of biological processing t emperatures in those months. It was also found that the energy consumption of the related consumers to the biological stages of domestic wastewater treatment accounted for 67.9% (in winter) and 66.9% (in summer) of the total consumed electricity. Based on this finding, it can be concluded that a significant increase in energy efficiency, respectively, the reduction of specific electricity consumption in the process of domestic wastewater treatment, is possible through procedures for streamlining biological stages, respectively, by stimulating the microbiological activity of activated sludge (increasing the rate of metabolism of pollutants in wastewater). .,","PeriodicalId":38292,"journal":{"name":"EEA - Electrotehnica, Electronica, Automatica","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84299225","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}

{"title":"Complex System for Earthquake Prediction and Protection of Gas Installations","authors":"V. Toader, O. Ciogescu, A. Mihai, Daniel Lngvay, A. Borş, I. Lingvay","doi":"10.46904/eea.20.68.4.1108013","DOIUrl":"https://doi.org/10.46904/eea.20.68.4.1108013","url":null,"abstract":": In order to prevent explosions and fires caused by the ignition of uncontrolled gas leaks from damaged pipes following some devastating earthquakes, a complex system for earthquake prediction and protection of gas installations has been designed. The designed system ensures both the acquisition of data on local precursor parameters (evolution of radon emanations, evolution of earth's crust temperature, etc.) and local intensities of seismic events. Their transmission for processing to the national seismic dispatcher, thus contributing to a better knowledge in the earth physics field and implicitly to increase the accuracy of seismic predictions as well as 3D measurement of the local intensity of tectonic movements. In the case of seismic events with dangerous local int ensity (above a pre - imposed, programmable threshold) the control signal is generated for the closure of gases by specialized aquatics (electrovalves mounted in front of the gas regulation/measurement block of the protected buildings). The system also ensures the take over and display of the information package about the state (closed / open) of the electrovalves mounted in front of the gas regulation / measurement block of the protected buildings. The 3D vibration transducer and the temperature transducer for the data acquisition system are mounted in a 40 m deep drilled well and the radon one on the surface (in the protection and visiting chimney of the well with transducers). Representative images regarding the realization/implementation of the system are presented. Compared to the known alert systems, the designed system requires little space for implementation and provides a number of advantages, such as: providing information on the evolution of precursor parameters of seismic movements in a given locality to the national seismic dispatcher, the level of knowledge in the field of Earth physics and the predictability of earthquakes; local validation of the intensity of tectonic movements in 3D and automatic closing in real time, without human intervention, of the gas connections in case of exceeding a pre - established dangerous threshold; revention of explosions and devastating fires following the damage of gas installations due to major earthquakes in a given locality (where the system is implemented), especially in public institutions, schools, boarding schools, hospitals, old people's homes, etc.","PeriodicalId":38292,"journal":{"name":"EEA - Electrotehnica, Electronica, Automatica","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90216751","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}

{"title":"The Hydro Plants as Optimal Solution for Efficient Conversion Energy in Black Sea Environmental Conditions","authors":"Victor Stoica, D. Marin","doi":"10.46904/eea.20.68.4.1108003","DOIUrl":"https://doi.org/10.46904/eea.20.68.4.1108003","url":null,"abstract":"The paper presents the analysis of the solutions concerning hydro plants, optimal for the energy efficient conversion in Black Sea environmental conditions. Wave energy conversion installations, their classification and the main constructive characteristics of wave installations are presented. Also presented in the paper are types of hydro - pneumatic installations suitable for the efficient conversion of the wave energy under the conditions of the Black Sea, such as oscillating, anchored to the shore or by talus dams, located near the shore, included in coastal protection dams made from reinforced concrete caissons and floating.","PeriodicalId":38292,"journal":{"name":"EEA - Electrotehnica, Electronica, Automatica","volume":"85 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76814834","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}

{"title":"“mBH”, Efficient Device for Measuring Static B-H Relationships of Ferromagnetic Materials","authors":"C. Grumeza, P. Andrei, M. Marin, P. Minciunescu, M. Maricaru, I. Hantila, S. Marinescu","doi":"10.46904/eea.20.68.4.1108006","DOIUrl":"https://doi.org/10.46904/eea.20.68.4.1108006","url":null,"abstract":"One presents the mBH device for measuring static B - H relationships of ferromagnetic materials, whose functioning model had been developed with the help of ICPE SA. Initially, the measuring principle was presented in the PhD Thesis of eng. P. Andrei [1], but the first physical version of the device had some deficiencies and could not reach magnetic flux densities values higher than 1.8T. Thus, new geometries of the magnetic circuit were proposed, using field concentrators, together with the development of computation programs for the magnetic flux - magnetic voltage relationships of the magnetic circuit branches. The tests on the device confirmed the correctness of the proposed method.","PeriodicalId":38292,"journal":{"name":"EEA - Electrotehnica, Electronica, Automatica","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90659144","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}

{"title":"Trajectory Planning of Multi-dimensional Actuator based on Improved S-shaped Velocity Curve","authors":"Guo Xi-wen, Wunbin Siao, Wang Qunjing, Wen Yan, Wu Tao","doi":"10.46904/eea.20.68.4.1108009","DOIUrl":"https://doi.org/10.46904/eea.20.68.4.1108009","url":null,"abstract":"In order to improve the smoothness of the velocity of the multi-dimensional actuator rotor output shaft and reduce the impact of sudden change of torque on the system, a trajectory planning method based on the improved Sshaped velocity curve is proposed in this paper. Firstly, according to the position information of the key points in the track of the multi-dimensional actuator, the Euler rotation angle of the point-to-point is obtained by coordinate transformation. Then, based on the parameters of S-shaped velocity curve, the corresponding acceleration equation is solved, and then the control torque is output by using point-to-point torque generation tool. Finally, Gaussian function algorithm is used to fit the output angular velocity information, which makes the velocity, acceleration and control torque of the multi-dimensional actuator trajectory change continuously. Simulation results verify the correctness of the proposed scheme.","PeriodicalId":38292,"journal":{"name":"EEA - Electrotehnica, Electronica, Automatica","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82077015","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}