Power System Engineering最新文献_第8页

Microstructures and Mechanical Properties of Extruded Al 7050 Billet and Ring Forged One with Large Scale 大型挤压Al 7050坯料和环锻坯的组织与力学性能

Power System Engineering Pub Date : 2016-12-31 DOI: 10.9726/KSPSE.2016.20.6.040

D. Bae, K. Joo, Jin-Kyung Lee, Sang-Pill Lee, Chang-Beom Chang, Sung-Seop Hong, T. Park

{"title":"Microstructures and Mechanical Properties of Extruded Al 7050 Billet and Ring Forged One with Large Scale","authors":"D. Bae, K. Joo, Jin-Kyung Lee, Sang-Pill Lee, Chang-Beom Chang, Sung-Seop Hong, T. Park","doi":"10.9726/KSPSE.2016.20.6.040","DOIUrl":"https://doi.org/10.9726/KSPSE.2016.20.6.040","url":null,"abstract":"The manufacturing process of large scaled Al 7050 alloy is difficult for the occurrence of solidification crack during casting. The aims of this study are the evaluations of microstructure and mechanical properties of extruded Al 7050 billet and ring forged one with large scale. Large scaled Al 7050 billet was casted by direct-chill casting process. The extruded and ring forged specimens were prepared from the casted ingot after residual stress relief and homogenization heat treatment, respectively. Microstructures, hardness and tensile test of the surface, middle and center part of each specimen were performed at room temperature. Sheared and elongated type grains were observed at the edge parts of surface and center area and its aspect ratios of grains were low and similar as 0.21 while that of middle area was closed to 0.92 value in ring forged Al 7050 alloy. The mechanical properties of extruded Al 7050 alloy were superior than those of ring forged one. The hardness values of surface and center part were slightly higher than that of middle part in ring forged Al 7050 alloy.","PeriodicalId":360692,"journal":{"name":"Power System Engineering","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123875592","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}

引用次数: 0

Study on the Correlation of Leakage by the Variation of Inlet Pressure and Clearance in Hydrostatic Bearing 静压轴承进口压力与间隙变化与泄漏的相关性研究

Power System Engineering Pub Date : 2016-12-31 DOI: 10.9726/KSPSE.2016.20.6.034

C. Yun, K. Bae, Jinseong Jeoun

{"title":"Study on the Correlation of Leakage by the Variation of Inlet Pressure and Clearance in Hydrostatic Bearing","authors":"C. Yun, K. Bae, Jinseong Jeoun","doi":"10.9726/KSPSE.2016.20.6.034","DOIUrl":"https://doi.org/10.9726/KSPSE.2016.20.6.034","url":null,"abstract":": This paper is the numerical study on the correlation of leakage by the variation of inlet pressure and clearance in hydrostatic bearing. The main goal of this study is to apply to the design of hydro system the results that the pocket pressure and the leakage rate according to the inlet pressure and the clearance between piston and cylinder tube. Because the hydrostatic bearing in hydraulic cylinder has the narrow rectangular channel between piston and cylinder tube, so to verify the numerical scheme, it has been compared with the experimental results of Brackbill and Kandlikar. The pressure data of numerical results inside narrow rectangular channel correlate was showed a good agreement with experimental results, thereby the numerical scheme was applied to the real model that is a hydraulic cylinder with the hydrostatic bearing. In conclusion, the pressure differences between inlet and pocket were shown within 3%. Leakage rates were showed rapidly increased pattern between about 4.5 and 6.7 times because the section area to calculate the leakage rates were proportioned to a square of diameter. The correlation equation was calculated among the inlet pressure, the clearance and the leakage rate by using the linear regression.","PeriodicalId":360692,"journal":{"name":"Power System Engineering","volume":"382 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115910408","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}

引用次数: 0

Status of use of refrigerants in ship 船舶制冷剂的使用状况

Power System Engineering Pub Date : 2016-12-31 DOI: 10.9726/kspse.2016.20.6.005

B. Hwang, J. Yoon, C. Son, Min-Ju Jeon

引用次数: 0

Quantitative Visualization of Mixed Convection in 3-D Rectangular Channels Using TLC Tracers 利用TLC示踪剂定量可视化三维矩形通道中的混合对流

Power System Engineering Pub Date : 2016-12-31 DOI: 10.9726/kspse.2016.20.6.051

R. Piao, J. S. Kim, D. Bae

引用次数: 0

Large Eddy Simulation on the Vorticity Characteristics of Three-Dimensional Small-Size Axial Fan with Different Operating Points 三维小尺寸轴流风机不同工作点涡度特性的大涡模拟

Power System Engineering Pub Date : 2016-12-31 DOI: 10.9726/KSPSE.2016.20.6.064

Jang-Kweon Kim, Seok-Hyung Oh

引用次数: 0

Effect of Cold Working on the Tensile Strength of Fe-26Mn-4Co-2Al Damping Alloy 冷加工对Fe-26Mn-4Co-2Al阻尼合金抗拉强度的影响

Power System Engineering Pub Date : 2016-12-31 DOI: 10.9726/KSPSE.2016.20.6.046

C. Kang, Seong-Hwi Kim, Gyu-Seong Jeong

引用次数: 1

The Study on Low-cost Position Sensor Using Index and Increment PWM 基于指数增量PWM的低成本位置传感器研究

Power System Engineering Pub Date : 2016-12-31 DOI: 10.9726/KSPSE.2016.20.6.027

Young-Su Kim, S. Kwon

{"title":"The Study on Low-cost Position Sensor Using Index and Increment PWM","authors":"Young-Su Kim, S. Kwon","doi":"10.9726/KSPSE.2016.20.6.027","DOIUrl":"https://doi.org/10.9726/KSPSE.2016.20.6.027","url":null,"abstract":"BLDC motors have the strong point of allowing high-efficiency operation, yet with the weak point of requiring position information for operation. Moreover, there have recently been frequent cases where the product differentiation of even a cheap BLDC motor demanded a high level of control performance similar to that of a controller using a high-precision position sensor. This paper proposes low cost position sensor that enables the acquisition of rotor position information based on index and incremental PWM, using a single position sensor instead of an expensive incremental encoder or a cheap 3 phase hall sensor. The characteristic of the proposed encoder is that index information at every 60° of electrical angle is inscribed on the encoder disk, as well as a multiple number of values representing information about PWM, which is obtained by modulating information about the electrical angle of the rotor that has the resolution of 60°. Such a method has the characteristic of enabling the acquisition of high-precision position information based on the information about a multiple number of PWM waveforms and counter values that have all been inscribed on the encoder disk for each 60° range. The feasibility of the proposed new encoder was verified by fabricating a prototype encoder generating 240 pulses, followed by confirming its performance using Micom’s capture and software counter functions.","PeriodicalId":360692,"journal":{"name":"Power System Engineering","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128548183","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}

引用次数: 0

Performance Analysis of Ejector-Pump Thermal Energy Conversion System Using Various Working Fluids 不同工质的喷射器-泵热能转换系统性能分析

Power System Engineering Pub Date : 2016-12-31 DOI: 10.9726/KSPSE.2016.20.6.087

J. Yoon, S. Seol, C. Son, K. Choi, Young-Bok Kim, Ho-seang Lee, Hyeon-Ju Kim, Jung-Hyun Moon

引用次数: 0

Analysis of Design Factors for High Performance Fuzzy Logic Control of Refrigeration Cycle 制冷循环高性能模糊逻辑控制设计因素分析

Power System Engineering Pub Date : 2016-12-31 DOI: 10.9726/kspse.2016.20.6.011

Sungwoon Choi, Seok-kwon Jeong, Jooho Yang

引用次数: 0

Heat Characteristics Analysis of Radiator for PCB-Board pcb板散热器热特性分析

Power System Engineering Pub Date : 2016-12-31 DOI: 10.9726/KSPSE.2016.20.6.020

S. Jang, Min-Su Kweon, Soo-Min Han

引用次数: 1