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Journal of the Korean Society of Mechanical Technology最新文献

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벽면의 형상 변화에 의한 난류 드래그 관련 Pocket Length Scale 저감연구 与壁面形状变化湍流拖曳相关的Pocket Length Scale低减研究
Journal of the Korean Society of Mechanical Technology Pub Date : 2019-12-31 DOI: 10.17958/ksmt.21.6.201912.1007
Seoung-Chool Yoo, Jang-Hyen Jo
{"title":"벽면의 형상 변화에 의한 난류 드래그 관련 Pocket Length Scale 저감연구","authors":"Seoung-Chool Yoo, Jang-Hyen Jo","doi":"10.17958/ksmt.21.6.201912.1007","DOIUrl":"https://doi.org/10.17958/ksmt.21.6.201912.1007","url":null,"abstract":"The flow-surface interaction and resulting pockets is the case of a turbulence boundary layer. Conditionally sampled hot-wire measurements within the wall region show that a strong vortex forms within the pocket, bordering the upstream portion, which stay in the wall region. This vortex is the result of the rearrangement of existing sublayer vorticity and its amplification. The work in this area has been applied to the prediction and reduction of drag. The study is focused on determining change in the length scale of the pockets. An important relationship between pocket and modified wall has been found. By changing the upstream boundary condition at the wall, the length scale of pockets were decreased.","PeriodicalId":168106,"journal":{"name":"Journal of the Korean Society of Mechanical Technology","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115503067","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
특허 데이터에 의한 자동차용 듀얼 클러치 변속기의 글로벌 기술경쟁력 분석 根据专利数据分析汽车用双离合器变速器的全球技术竞争力
Journal of the Korean Society of Mechanical Technology Pub Date : 2019-12-31 DOI: 10.17958/ksmt.21.6.201912.1161
Lee， chang-hoan, Boong Kee Choi, KimChiKyoon
{"title":"특허 데이터에 의한 자동차용 듀얼 클러치 변속기의 글로벌 기술경쟁력 분석","authors":"Lee， chang-hoan, Boong Kee Choi, KimChiKyoon","doi":"10.17958/ksmt.21.6.201912.1161","DOIUrl":"https://doi.org/10.17958/ksmt.21.6.201912.1161","url":null,"abstract":"The technology competitions of automobile manufacturers are getting hot. The characteristics of the environment friendly automobile are not only lowering the emission of harmful exhaust gas through the change of the power source, but also paying great attention to improvement of the power efficiency. As the market for pure electric vehicles continues to grow, we have analyzed the global technology competitiveness by DCT (Dual Clutch Transmission) patents. Clustering can be classified into five types ; 1) a cluster associated with a dual clutch transmission system, 2) a cluster of a torque transmission device and a reverse speed ratio, 3) a cluster of co-planar sets and dual clutch assemblies related to transmitting devices, 4) Device clusters, and 5) a cluster of synchronizers and clusters to prevent simultaneous operation of dual clutch transmissions. In recent years, demand for pure electric vehicles has been rapidly increasing, and patent applications related to DCT have been steadily increasing for energy efficiency of motor power sources.","PeriodicalId":168106,"journal":{"name":"Journal of the Korean Society of Mechanical Technology","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130309835","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
EES를 이용한 백연저감 열교환 시스템의 성능해석 연구 利用EES分析白铅低减热交换系统性能的研究
Journal of the Korean Society of Mechanical Technology Pub Date : 2019-12-31 DOI: 10.17958/ksmt.21.6.201912.1035
왕쩐후안, 권영철
{"title":"EES를 이용한 백연저감 열교환 시스템의 성능해석 연구","authors":"왕쩐후안, 권영철","doi":"10.17958/ksmt.21.6.201912.1035","DOIUrl":"https://doi.org/10.17958/ksmt.21.6.201912.1035","url":null,"abstract":"In this study, a white smoke reduction simple prediction model of white smoke reduction heat exchange system was developed by using EES. In order to verify the reliability of the EES model, it was compared with the computational results. The developed EES predictive model was used to calculate the temperature and absolute humidity of the mixed SA and EA according to the change of cooling water capacity, flow rate ratio of SA/EA, and SA inlet temperature. The difference between final temperature and absolute humidity at the outlet of the mixer calculated by computational analysis and EES was within 1.4% and 3.6%. As the cooling water capacity and the inlet flow rate ratio increased, and as the inlet air temperature decreased, the temperature and absolute humidity of the mixer decreased. The most influential factor in the white smoke reduction effect among the design variables of the white smoke reduction heat exchange system was the flow rate ratio of SA/EA.","PeriodicalId":168106,"journal":{"name":"Journal of the Korean Society of Mechanical Technology","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133898549","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
데이터 센터 및 건물 공조용 냉수코일의 종류에 따른 성능 특성에 관한 연구 数据中心及建筑物空气调节用冷水线圈不同种类的性能研究
Journal of the Korean Society of Mechanical Technology Pub Date : 2019-12-31 DOI: 10.17958/ksmt.21.6.201912.1021
Min-Geon Go, Byoung-Nam Choi, Hyung-Beom Seung
{"title":"데이터 센터 및 건물 공조용 냉수코일의 종류에 따른 성능 특성에 관한 연구","authors":"Min-Geon Go, Byoung-Nam Choi, Hyung-Beom Seung","doi":"10.17958/ksmt.21.6.201912.1021","DOIUrl":"https://doi.org/10.17958/ksmt.21.6.201912.1021","url":null,"abstract":"In this study, heat exchangers used in data center and building air-conditioners were tested according to the type of heat exchangers to select them for commercial use. The experiment was performed three samples, one micro channel heat exchanger, the same volume oval coil and the same performance oval coil. The experiment conducted under actual operation conditions in the data center and building. Micro-channel heat exchanger has lower air side pressure drop and higher capacity per volume than oval coil. It may be advantageous when the installation small space or the little design static pressure in the fan, such as in-row systems or CRAC installed in data center.","PeriodicalId":168106,"journal":{"name":"Journal of the Korean Society of Mechanical Technology","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123901649","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
플랜트 대형기계의 소음 발생 실태에 관한 실험적 연구 成套设备大型机械噪音产生实态的实验研究
Journal of the Korean Society of Mechanical Technology Pub Date : 2019-12-31 DOI: 10.17958/ksmt.21.6.201912.1112
Lee Dong Pil, Kim Byoung-sam
{"title":"플랜트 대형기계의 소음 발생 실태에 관한 실험적 연구","authors":"Lee Dong Pil, Kim Byoung-sam","doi":"10.17958/ksmt.21.6.201912.1112","DOIUrl":"https://doi.org/10.17958/ksmt.21.6.201912.1112","url":null,"abstract":"The purpose of this study was to establish the noise generation actual condition of large machine in plant. most of the plant's large-scale machines are designed and manufactured overseas, so it is difficult to access basic information. The regulatory standards, management plans and measurement methods for these machines are insufficient. It is necessary to obtain information about the noise storage devices installed for warranty and the noise reduction device when designing the equipment. Investigation of the occurrence of large-scale machine noise at domestic plant sites was conducted. The sound insulation design of the industrial safety and health care law benchmark and the large-scale machine compound noise design of the equipment are carried out.","PeriodicalId":168106,"journal":{"name":"Journal of the Korean Society of Mechanical Technology","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131021399","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
단조 성형해석에 의한 AL6061 유니버셜 조인트 개발에 관한 연구 …AL6061基于单调整形解释的环球拼接开发研究。
Journal of the Korean Society of Mechanical Technology Pub Date : 2019-12-31 DOI: 10.17958/ksmt.21.6.201912.995
김은성, 송준혁
{"title":"단조 성형해석에 의한 AL6061 유니버셜 조인트 개발에 관한 연구","authors":"김은성, 송준혁","doi":"10.17958/ksmt.21.6.201912.995","DOIUrl":"https://doi.org/10.17958/ksmt.21.6.201912.995","url":null,"abstract":"유니버설 조인트는 두 회전 축 사이에서 힘을 전달하는 구성 요소이며, 구동축과 피동축이 나란히 정렬되지 않아도 나란히 정 렬되지 않아도 동력전달이 가능하게 하며 각도 변화가 있는 전동축에서도 효율적으로 동력을 전달시키는 부품으로서 자동차의 동 력전달 장치에서 많이 적용되고 있다. 차량의 경량화를 위해 고강도 알루미늄의 사용이 증가하고 있다. 본 연구에서는 알루미늄 6061 재질을 사용하여 유니버셜 조인트 샤프트를 성형하기 위해 환봉 압출, U-Shape 성형, Spline 성형 등에 대한 단조 해석 연구하였다. Bar Extrusion 성형 시 23.3Ton, U-shape 성형 시 62.2Ton, Spline 성형 시 3.2Ton, 총 Cycle Time 226sec의 성형 조건을 산출하였으며, 이를 적용하여 알루미늄 유니버셜 조인트를 제작하였다. 비틀림 시험을 통해 토크값은 평균 425.8 (N・m), 비틀림 각은 평균 171.6∘ 의 실험값을 통해 기존 제품에 비해 단조 제품이 12.0∼14.4%의 비틀림 성능의 향상을 보였다.","PeriodicalId":168106,"journal":{"name":"Journal of the Korean Society of Mechanical Technology","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134008290","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
하방비등 조건에서 슬러그 기포의 정량적 가시화 기법에 대한 불확정성 해석 연구 研究在下防费等条件下强击气泡定量可视化技术的不确定性解释
Journal of the Korean Society of Mechanical Technology Pub Date : 2019-12-31 DOI: 10.17958/ksmt.21.6.201912.1051
김지민
{"title":"하방비등 조건에서 슬러그 기포의 정량적 가시화 기법에 대한 불확정성 해석 연구","authors":"김지민","doi":"10.17958/ksmt.21.6.201912.1051","DOIUrl":"https://doi.org/10.17958/ksmt.21.6.201912.1051","url":null,"abstract":"This paper reports an uncertainty analysis of quantitative visualization methodology for slug bubble dynamics in downward-facing nucleate boiling condition. Measurement of dynamics of slug bubble, i.e. departing speed, frequency, and diameter, is very important to predict safety margin of thermal systems in moving vehicle. By employing high speed visualization and post-processing, we quantitatively measured the volume and location of slug bubble, so that vapor generation rate and departing speed data were derived from their time differentiation. As a visualization methodology, its reliability was evaluated via uncertainty analysis. For 95% confidence interval, uncertainty of vapor generation rate and departing speed were 3% and 2%, respectively, and which were one order lower than standard deviation of those data.","PeriodicalId":168106,"journal":{"name":"Journal of the Korean Society of Mechanical Technology","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117240760","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
3자유도 재활 시뮬레이터 프로토타입 설계 및 검증 三自由度康复模拟器原型设计与验证
Journal of the Korean Society of Mechanical Technology Pub Date : 2019-12-31 DOI: 10.17958/ksmt.21.6.201912.1041
이효동, Kong Jae-ho, Yi Hak
{"title":"3자유도 재활 시뮬레이터 프로토타입 설계 및 검증","authors":"이효동, Kong Jae-ho, Yi Hak","doi":"10.17958/ksmt.21.6.201912.1041","DOIUrl":"https://doi.org/10.17958/ksmt.21.6.201912.1041","url":null,"abstract":"This paper presents a prototype of a three degree of freedom mannequin simulator for rehabilitation education. A three degree of freedom (shoulder 2, elbow 1) model which is similar to the human body is developed. In addition design of mathematical model with consideration about the resistance of muscles and ligaments is proposed. To apply ROM inspection method to the mannequin simulator, this paper introduces the PID controller of the mannequin simulator prototype with the ROM inspection method. Rehabilitation specialists verify the mannequin simulator with the ROM test method, and the validation experiments show that the simulator has “good” levels of similarity.","PeriodicalId":168106,"journal":{"name":"Journal of the Korean Society of Mechanical Technology","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116069671","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
FDM 3D 프린터 베드 위치에 따른 ABS 시편 색상 차이에 관한 연구 FDM 3D打印机床位ABS诗篇色彩差异的研究
Journal of the Korean Society of Mechanical Technology Pub Date : 2019-12-01 DOI: 10.17958/ksmt.21.6.201912.1180
홍청민, 최형인
{"title":"FDM 3D 프린터 베드 위치에 따른 ABS 시편 색상 차이에 관한 연구","authors":"홍청민, 최형인","doi":"10.17958/ksmt.21.6.201912.1180","DOIUrl":"https://doi.org/10.17958/ksmt.21.6.201912.1180","url":null,"abstract":"","PeriodicalId":168106,"journal":{"name":"Journal of the Korean Society of Mechanical Technology","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122198510","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
토글식 사출성형기의 하중측정에 관한 연구 托格式注塑机荷重测定的研究
Journal of the Korean Society of Mechanical Technology Pub Date : 2019-12-01 DOI: 10.17958/ksmt.21.6.201912.1169
JungHyunsuk
{"title":"토글식 사출성형기의 하중측정에 관한 연구","authors":"JungHyunsuk","doi":"10.17958/ksmt.21.6.201912.1169","DOIUrl":"https://doi.org/10.17958/ksmt.21.6.201912.1169","url":null,"abstract":"","PeriodicalId":168106,"journal":{"name":"Journal of the Korean Society of Mechanical Technology","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131308817","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
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