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
제17권 제1호 (2015년 2월) 27건
생산기술
21.
2015.02
구독 인증기관 무료, 개인회원 유료
This paper has been carried out the forming analysis, die stress analysis, and relevant tests for the straightness improvement of hollow shafts with blocktooth. Hollow forward extrusion is a process that a material in a die is pressed with a punch and the material is formed into the same direction through the gap of a mandrel and a bottom die. For an asymmetric shaped product, due to the difference of reduction ratios of the cross sections in its extruding, a phenomenon that the product bends from the difference of the flow speed comes to occur. As applying the key to the mandrel has a uniform flow speed, bending problem was solved. These were processed using Deform-3D as a finite-element analysis program. Analysis was compared with the experiment. Keyway height of the mandrel has been confirmed that the straightness best when it comes 0.1mm. These study are expected to be available as fundamental data in die design necessary for the manufacture of asymmetric goods in the future.
4,000원
22.
2015.02
구독 인증기관 무료, 개인회원 유료
In military, Electro-optic/Infra-red system that is used to obtain the target image of high performance induced blur images by the vibration of the carrier and inner optical devices. Optical devices of the EO/IR is constituted by the optical lens, detector and mechanical assembly. High performance detectors for IR camera are typically used for stirling cryocooler to maintain the temperature of the detection surface cryogenically. However, This cooler induces a blur image on detector surface by the vibration. In this study, we performed modal analysis and response analysis of the mounting structure design which can minimize the vibration of the cooler and detector. Also, We confirmed that we were designed robust mounting structure according to the vibration through the response analysis models the inner gimbal and optics.
4,000원
23.
2015.02
구독 인증기관 무료, 개인회원 유료
The effective use of disinfection and sterilization is important in preventing healthcare associated infections. Especially, multi-drug resistant organism and spore-forming bacteria are serious pathogens. Therefore, control of a nosocomial infection is emerging as a big problem. It is efficiently necessary to eliminate the pathogen. In this study, the components of sterilant were optimized. The optimized sterilant was applied for efficiency of sterilization using G. stearothermophilus E. coli, S. aureus as a standard microorganism. Our results were shown as follows : The decomposition or loss of potency of sterilant in small containers did not appeared for one month at ambient temperature. All of hydrogen peroxide 0.5%, peracetic acid 0.01%, and IPA 60% was effective for sterilization of E. coli, S. aureus using dilution method. Two kinds of sterilants(hydrogen peroxide 2%+peracetic acid 0.1%+IPA 0.5%, hydrogen peroxide 4%+peracetic acid 0.06%+IPA 1%) were bacteriocidal(> 6 log reduction). Microorganisms(E. coli, S. aureus) which treated with these sterilants for 2min were not grown in LB broth at 7 days culture. The gas plasma system for sterilization was applied. The sterilant solution(hydrogen peroxide 20%+IPA 5%) was vaporized in the sterilization chamber. The vaporized sterilant was bacteriocidal and sporocidal(> 6 log reduction) using G. stearothermophilus E. coli, S. aureus as biological indicators
4,000원
24.
2015.02
구독 인증기관 무료, 개인회원 유료
This study aims at developing the paraglider with the enhanced function and safety of flight by performing the simulation and test of flight with two slots at each wing tip of canopy. When the distributions of velocity and shear stress at wall around the canopy were compared, the canopy with slots showed the distribution of less velocity and shear stress at wall significantly than the canopy without slots by confirming the safety of the paraglider. Series of simulation were conducted to achieve the optimal shape of slots by applying various sizes and positions of the slots, resulting nine cases with the better outcome on which flight tests were based. The flight test results in this study confirmed that canopy with slots showed the improved flight function by increasing the maximum velocity, decreasing the minimum velocity, delaying the stall timing significantly and consequently improving the safety of the paraglider. Based on the simulation and flight tests, three cases with the best outcome have been selected for merchandising strategies.
4,000원
25.
2015.02
구독 인증기관 무료, 개인회원 유료
This paper is concerned with the mechanical design of hyperbaric oxygen chamber for multi-users using stress analysis. HBOT(Hyperbaric Oxygen Therapy) is very effective medical equipment for increasing the concentration of melted oxygen in human and animal body. The hyperbaric oxygen supplies to the impaired cell of human and animal to recover the healthy condition. This research reported the design specifications and mechanical safety of hyperbaric oxygen chamber using computational stress analysis with CATIA program. The result from this research can be used for making the practical HBOT equipment for multi-users and to manufacture the real model
4,000원
26.
2015.02
구독 인증기관 무료, 개인회원 유료
This study has been performed to investigate on the spur gear with the spline key of heat treatment process analysis. The heat treatment process for gear has been widely used at the production of moving parts in order to improve its manufacture productivity. A driving spur gear is modeled with three dimensions for the heat treatment process. The variable conditions for the heat treatment analysis are the shape of gear tooth, the environmental heating temperature, heating time, cooling temperature and cooling. The analytical results of mechanical properties as micro structure and hardness are analyzed using the software. As the analysis result, the hardness value(HRC) becomes 20.2 of the inner part at gear body and of the surface part of gear tooth has shown the max. valve of HRC 47.5. The beinite structure forms up to 70%. This is because the cooling becomes slow at the center part than the end part. Therefore, it is estimated that the gear tooth have the high anti-wear property and the inner center part maintains the sufficient stiffness. These results can be utilized for the production of the driving gear by the heat treatment process as the fundamental information
4,000원
27.
2015.02
구독 인증기관 무료, 개인회원 유료
Traditionally the powder polymer has been used in the sewage sludge treatment and water purifying plants. The powder polymer, however, has several problems such as bad working condition by dispersed powder and unstable operation of dehydrator by a lump of undissolved polymer. In this study, high accuracy automatic dissolving system for emulsion polymer is developed to reduce the cost of facility and is suitable for unit-process automation. This system is consist of the emulsion polymer storage tank, polymer dissolving solution supply tank, mixing chamber, micom and mobile system, etc. Performance tests for the system such as the rated flow of flowmeter, quantity of the tube pump, solubility of the mixing chamber, accuracy of micom and mobile system have been performed. The performance of the prototype system satisfies all the objects of this study.
4,000원
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