간행물
한국기계기술학회지 KCI 등재 Journal of the Korean Society of Mechanical Technology 韓國機械技術學會誌
- 발행기관 한국기계기술학회
- 자료유형 학술지
- 간기 격월간
- ISSN 1229-604X (Print)2092-0385 (Online)
- 수록기간 1999 ~ 2024
- 주제분류 공학 > 기계공학 공학 분류의 다른 간행물
- 십진분류KDC 550DDC 620
권호리스트/논문검색
제8권 제4호 (2006년 12월) 6건
1.
2006.12
구독 인증기관 무료, 개인회원 유료
The cylindrical gear in power window motor assembly is important to doors of automobile. This study is performed for purpose of getting a manufacturing technique instead of large quantities import and small cavity mold production.
This multi-cavity cylindrical gear is produced under five procedures. The first, mold design of massproduction, the second, making a CAE model for mass-production, the third, manufacturing of sample mold, the fourth, trying-out and measuring of 3 dimensional design, the fifth, acquisition of data analysis and mold modification. Among them, analysis of mass-production using CAE, design and manufacturing of multi-cavity are successfully performed.
In the results, it is concluded that mold for one gate and six cavity based on hot-runner is suitable for making a cylindrical gear.
4,000원
2.
2006.12
구독 인증기관 무료, 개인회원 유료
Vortex tube is a simple device which can produce two streams of hot and cold temperature without any chemical reaction from a compressed gas stream. Recently, it is expected to be not only one of the possible alternative cooling methods to reduce environmental hazard but also various applications. Small size vortex tube is widely used in industrial application, just like a spot cooling devices, however, it is not enough to study length effect of the vortex tube yet. Therefore, experiments were carried out in various vortex length ratio(L/D=10-55) to find an appropriate geometry of vortex tube length at 5.6mm diameter, under optimum conditions, i.e. vortex nozzle area ratio(Sn=0.155) and cold end orifice diameter ratio(ζ=0.446). Working fluids was used air. The results shows that L=25D is design guide in the vortex tube.
4,000원
3.
2006.12
구독 인증기관 무료, 개인회원 유료
Recently, buildings are constructed increasingly higher and even more people are using elevators every day. Therefore, more efficient means of vertical transportation are required. Most of high-rise buildings is equipped with elevators. Unlike one elevator system, a multi-elevator system requires a function, which can distribute multiple elevators effectively. This paper examines a multi-elevator system, which has been modeling mathematically, in order to reduce waiting time and use elevators more effectively.
4,000원
4.
2006.12
구독 인증기관 무료, 개인회원 유료
It is essential to develop the shield for the extraction of high quality neutron beam and safe work at the sample position. The aim of this study is design, fabrication and filling of the shield in domestic. In consideration of ST-3 beam port of HANARO, we designed the reflectometer shield composed of 14 blocks and fabricated it shield casemate. Through the assembly and quality test of the shield casemate, we established the method of fabrication for neutron beam path and channel. In order to increase shield capacity, we filled shield casemate with heavy concrete, lead ingot and polyethylene that mixed B4C powder and epoxy. The average density of the filled heavy concrete was 4.7g/cm3, which can protect neutron and gamma ray effectively. Also, we developed ancillary equipment such as beam gate unit(BGU, vertical type) for the effective opening and closing of neutron beam. Shielding block was proved by suitable thickness as result that measure surface dosage using of detector and TLD. The acquired technique of design, fabrication and filling of ancillary equipment development can be applicable to the development of shield for the other neutron spectrometer in future.
4,000원
5.
2006.12
구독 인증기관 무료, 개인회원 유료
The ambient heavy metals data measured at major 7 cities (Seoul, Busan and Incheon et al) in Korea were used to explain the composition and general features of Asian Dust observed during 2002~2006. Generally heavy metal concentrations during the Asian Dust episodes had tendency of showing higher values at sites in west-north side than east-south side of Korea, which can be explained by the effect of diffusion and deposition. But in the result of this study, some heavy metals as chrome and nickel had shown more higher concentrations in east-south site and in case of copper at the west-south site of Korea. These features were influenced by the weather conditions, topography factors or characteristics of soil composition in each sources. And the concentration of heavy metals makes increase every year in proportioned with the industrial growth of source areas. Futhermore, the study will be continue to search minutely the relation with weather and topography factors.
4,000원
6.
2006.12
구독 인증기관 무료, 개인회원 유료
This work was performed to investigate the distribution of the fuel droplet size around the bluff-body and the combustion characteristics. The geometry of the bluff-body influenced the spray shape and the combustion characteristics. Diameters of the bluff-body in this experiment are 6, 8, and 10mm and the impingement angles( θ) are 30°, 60°, and 90°. The measurement points were at the distances of 20 and 30mm axially from the nozzle. The SMD and Rosin-Rammler distribution was acquired by image processing technique(PMAS), and the mean temperatures were measured by thermocouple. The results obtained are as follows; In the condition of θ=60°, the values of SMD are not greatly varied compared to the other conditions. As the impingement angle of bluff-body was increased, the high temperature region was wider along radial direction. When the air-fuel ratio was increased, the CO concentration was decreased.
4,000원
