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
제19권 제5호 (2017년 10월) 28건
21.
2017.10
구독 인증기관 무료, 개인회원 유료
Assessment of noise exposed population is to check the environment noise level and social influence in order to reduce the risks such as annoyance and disturbance that are generated by environmental noise. Also, this method suggests the preferential noise abatement policy and action plan by accurately finding the area that the noise causes harmful effect to human health. Recently, a noise map, which can predict noise in comprehensive area, is used for the assessment of noise exposed population, breaking from the methods using existing measures. In particular, countermeasure for noise can be considered more effectively by using assessment methods of noise exposed population for specific noise level, area, and building types which are the main input factors in noise maps. In this study, we propose noise reduction ranking decision at ship construction and repair process due to noise map.
4,000원
22.
2017.10
구독 인증기관 무료, 개인회원 유료
A hydraulic system is a driving or transmission system that uses high pressure hydraulic fluid to power hydraulic machinery. It refers to the transfer of energy from flow and pressure. A hydraulic pump is a mechanical source of power that converts mechanical power into hydraulic energy. Cavitation is the formation of vapor cavities in liquid that are the consequence of forces acting upon the liquid. It usually occurs when a liquid is subjected to rapid changes of pressure that cause the formation of cavities where the pressure is relatively low. In this study, a cavitation was measured when the vane pump is rotating. The rotation speed of the vane pump was tested at 1000 rpm to 5000 rpm. At that time, the temperature and pressure of each hydraulic oil were changed and controlled. The results show that flow rate and noise are changed when cavitation occurs.
4,000원
23.
2017.10
구독 인증기관 무료, 개인회원 유료
There is a need for the development of insulation products with excellent insulation performance and durable insulation for building components. Various policies has been trying to improve the energy efficiency of buildings. The development of energy-saving building materials is also evolving as the energy saving of buildings becomes a main trend. In public and commercial buildings, reliability and beauty are emphasized with respect to the safety of buildings. The purpose of this study was to develop a manufacturing equipment and technology for the development of high airtight stainless steel insulation doors that can meet energy saving design standards of buildings.
4,000원
24.
2017.10
구독 인증기관 무료, 개인회원 유료
To develop a high pressure main drive hydraulic cylinder for concrete pumping car, it is essential to accurately predict the internal flow structure of the hydraulic cylinder and ensure structural stability. Therefore, in this study structural and buckling analysis were essentially used for safe design. From analysis results, the maximum equivalent stress occurred when the cylinder thickness was 15 mm and the hydraulic cylinder was deemed to be structurally safe. The buckling analysis of the hydraulic cylinder assembly showed that the critical load factor was from 1.3732 to 12.021 and the critical force factor in the entire area was not observed because the critical load factor was greater than 1. The average flow rate of cylinder was uniformly distributed and the flow rate error for the inlet and outlet port could be found to be approximately identical to that of 2 %.
4,000원
25.
2017.10
구독 인증기관 무료, 개인회원 유료
This study is a study on the cracking of the main piston surface which is generated in the injection molding machine to generate mold force. The main piston machining process consists of high frequency heat treatment, grinding and super finishing after lathe turning. Scale, defect size, and fracture texture were observed for four cracks on the surface of the piston during the tempering process after high frequency heat treatment using a metallurgical microscope. In this study, it was confirmed that the cracked structure of the piston structure was ferrite and pearlite structure. It was confirmed that cracks progressed to 480 ㎛ and scale layer of 3 ㎛ or less. Surface hardening layer and hardness were min 2.0mm/HRc 58±2 spec 1.6 mm/HRc 56.5~57.5 In addition, cracks on the surface of the piston appear perpendicular to the rolling process. Therefore, it can be assumed that the crack occurred in the low temperature tempering process at 200°C or less after the high frequency heat treatment, not the material defect. Therefore, the temperature should be maintained at 200°C or higher during tempering after high-frequency heat treatment, and the cracking defect on the surface of the piston can be prevented by setting the feed rate to 1.3 mm/s or less during heat treatment.
4,000원
26.
2017.10
구독 인증기관 무료, 개인회원 유료
In this study, manufacturing equipments for urushiol free raw rhus verniciflua stem(RRVS) extracts are developed which do not need for drying process and high pressure device. The three layered pressure tank and heating medium oil boiler are designed which are more efficient than the conventional ones, and the safety of the tank is assured by the structural analysis software. Finally, the RRVS extracts are prepared by water extraction technique at 100℃ using the developed equipments. In the physicochemical experiments for the RRVS extracts, an allergen such as urushiol is not detected, whereas the antioxidant such as polyphenol and flavonoid are contained.
4,000원
27.
2017.10
구독 인증기관 무료, 개인회원 유료
A safety lancet was developed in this study. The development process consists of a conceptual design, mock-up tests, performance evaluation, verification, validation for medical device certification and mass production preparation. It is designed as a single unit which makes it possible to use more convenient. It is also designed as disposable product which cannot be reused or recycled structurally. The developed safety lancet can prevent the secondary infection by needle stick injury or reuse. Biocompatibility and physico-chemical characteristics were passed in KTL(Korea Testing Laboratory). Validation of gamma sterilization of packing materials was passed in professional company for mass production.
4,000원
28.
2017.10
구독 인증기관 무료, 개인회원 유료
The object of this paper is to examine the optimum sintering condition which have excellent mechanical properties compared to the conventional oilless bearing. It is shown that the sintering rate is the most excellent at 850°C, especially KAB-23, KAB-23G, PBF-8 specimens. With increasing the nitrogen injection rate, the apparent porosity increased gradually. In contrast, with increasing the hydrogen injection rate, the apparent porosity decreased gradually. It is shown that the apparent porosity is very useful in the range of nitrogen injection rate 2Nm 3 and hydrogen injection rate 10Nm 3 .
4,000원
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