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
제21권 제4호 (2019년 8월) 31건
<학술연구>
21.
2019.08
구독 인증기관 무료, 개인회원 유료
In this paper, optical infrared thermography simulation using thermal wave imaging technique is performed to analyze the thermal characteristics of delamination defects. In this study, lock-in thermography(LIT) and pulsed thermography(PT) simulation was performed to analyze the samples of european traditional tiles with delamination defects, and the analytical modeler was developed through the ANSYS 19.2 transient thermal analysis tool. Applied sinusoidal heating with modulation frequency according to pulse heating and phase locking technique. The thermal response of the sample surface by heating was recorded and then data analysis was performed. The temperature gradient characteristics of each technique were compared, and phase angle was calculated for the LIT to analyze the parameters for the experiment setting. The simulation model was developed as a useful data for practical optical infrared thermography tests.
4,000원
22.
2019.08
구독 인증기관 무료, 개인회원 유료
Aluminum alloys are the light weight materials, they are commonly used in many industrial applications such as electronic, aerospace, automotive, and medical industry. Because they are used in these such applications. Therefore, their light weight and high surface quality are required. In this paper, the surface improvement round flat aluminum alloy using lapping finishing method was explored. In order to find the optimal condition, lapping parameters such as, rotational speeds, abrasive grain sizes of pad, processing times, and lapping oils were investigated in this study. The improvement in surface roughness was found to be highest with optimal condition at 200 rpm of rotational speed, 1 ㎛ abrasive grain size of pad, 0.5ml of light oil for 720 sec. By using the optimal condition, the initial surface roughness Ra of round flat aluminum alloy can be enhanced from 2.59㎛ to 0.02 ㎛. This can be concluded that the small CNC machine with lapping finishing method can be used to enhance the surface roughness of round flat aluminum alloy effectively.
4,000원
<생산기술>
23.
2019.08
구독 인증기관 무료, 개인회원 유료
The objective of this numerical study is to investigate the effect of shaft part’s diameter on the load distribution, under-fill, and metal-flow line characteristics in tubular & solid shaft yoke of Al-IMS. The outer diameter of tubular shaft yoke was changed from 30mm to 35mm, and the shaft diameter of solid shaft yoke was varied from 20mm to 25mm. In this results, the required load for production was linearly increased with increasing the tubular shaft yoke outer diameter. In the solid shaft yoke, the loads for the shaft part extending process were almost constant by 10,000kg, however, the loads for generating the yoke process, which were needed a lot of strain, were increased by 4,000kg with increasing the diameter of shaft part. The under-fill regions according to diameter of the shaft part were not observed in both products, and the metal-flow lines were also straight without folding phenomena.
4,000원
24.
2019.08
구독 인증기관 무료, 개인회원 유료
Due to the development of plastic materials, injection molding products are limitlessly used. The colours of the plastic material also, have been developed to meet the needs of customers. The purpose of the present study is to verify the shrinkage of the injection-molded PC and PBT specimens in different colours. In this study, red, white, black and transparent colours were selected for PC resin. Also blue, red and black colours were selected for PBT resin. 50 specimens were produced per each colour, and measured after cooling-off. The P-value, the test statistic of the measurements in every direction of PC and PBT specimens were below 0.05 except the PBT specimen’s thickness. The rate of shrinkage for the length and thickness of PC specimens were 0.48% and 3.9% that obtained 4.4 times as big as the gap those between those two rates. The shrinkage in PBT were about 1.45% for the length and 5.08% for the thickness which had 3.6 times as big as the gap. This experimental results obtained that the colour of the resin (PC and PBT) effects its shrinkage. Consequently, the colour of the resin must be concerned in the event of injection-molding.
4,000원
25.
2019.08
구독 인증기관 무료, 개인회원 유료
PE pipes have excellent mechanical and chemical properties and are widely used as water and sewer pipes. The pipes are cut and transported 6 meters in length to facilitate transport and operation. Transferred pipes are joined just before reclamation, resulting in long working hours and environmental contamination due to leakage due to poor coupling. Additional costs are also incurred for the re-work. In this study, we developed a device that can combine the PE pipes and Sockets. Structural safety was verified through structural analysis. In combination with socket and pipe, there is no defect in joint and watertight test shows no leakage.
4,000원
26.
2019.08
구독 인증기관 무료, 개인회원 유료
This study deals with the design of the Stewart platform for an efficient 6 Degrees of Freedom (DOF) motion of a ship. The general methods of study of the Stewart platform – forward and inverse kinematics – are complex in nature, and are only applicable in limited and specific cases. In order to study the reduction of design time of the Stewart platform, the (please write the full form) DMU module supported by 3D CAD is used. The results show that the DMU module can easily identify the Stewart platform's clash and movements. In addition, it was also possible to calculate motor control data necessary for the prototype manufacturing process. Comparing the Upper plate angle displacement error of the prototype and the DMU results, the error range was found to be 1.5%.
4,000원
27.
2019.08
구독 인증기관 무료, 개인회원 유료
Modularization is an important benefit to overall project cost, such as construction period, manpower and logistics. In order to establish a successful modularization strategy, the optimum cost can be realized based on the Envelope Size which is allowed to be transferred to the plant site through analysis of each shape of the module. Through the analysis of the plant structure, the Envelope Size that can be transported on site in units of sizes suitable for maritime and onshore is provided, and finite element method is applied to the existing materials (A36, A572) and domestic materials (SS400, SM490, SWH400) and analyzed the results of the analysis to obtain domestic materials applicable to the plant structure frame.
4,000원
28.
2019.08
구독 인증기관 무료, 개인회원 유료
The purpose of this study was to develop high quality dark film honeycomb fabric curtains. The results of producing the prototype for various color tone development, hot melt viscosity, and adhesiveness test for the final prototype were as follows. The hexagonal honeycomb structure is easy to manufacture, has a good coupling force, and has a dark honeycomb fabric curtain. The hot melt condition was obtained with 540g of hot melt and 1.5kg of diluent, 242.3cp, and the curing result was obtained at 140°C. Seven different colors were developed using yellow, red, blue, and white four primary colors. The adhesive force test device was designed to enable more than 5,000 real tests by the automatic opening and closing device for the convenience of the field workers. The size of the test sample was designed to be 1,000mm × 1,200mm. As a result of designing and manufacturing the prototype to attach the monitor and the control device to automatically count, the prototype was made to be measured 10,000 times. The combined force of the honeycomb fabric curtain was maintained after 5,000 tests on the manufactured rock film honeycomb fabric curtain.
4,000원
29.
2019.08
구독 인증기관 무료, 개인회원 유료
The ship steering is a very important factor for safe operation. Recently, the ship is controlled in a space other than the wheelhouse through the wired controller. However, there has been a continuing need to improve the inconvenience of wired systems. In this study, a system to control the steering angle and throttle of ship by RF communication method was developed and applied to actual ship. Since the reliability is secured through the safety evaluation, the wireless steering system improves the convenience and economic efficiency of ship steering.
4,000원
30.
2019.08
구독 인증기관 무료, 개인회원 유료
Injection molding is extensively used for mass production of plastic products. Over the years, the plastic products have been manufactured in a variety of colors, materials and mechanical properties to fulfill the market demand. The purpose of this study is to identify the relation between the color of resin and the product quality. To proceed this study, different colored PBT specimens have injection molded, and mechanical properties were compared. Tensile tests and bending tests have carried out to study mechanical properties of the specimens, and differentials have occurred in tensile strength, bending strength and tensile elongation by their respective color. And the red specimens were broken during the bending test. The experimental results reveal that the color of the resin influences the mechanical strength of the injection molded product. As a result, the color of resin should be considered when setting parameters for injection molding in order to improve the product quality.
4,000원
31.
2019.08
구독 인증기관 무료, 개인회원 유료
Air Defense System requires fast movement of the turret to detect and attack the flying target of enemy. In order for the air defense system to operate accurately and properly, it is necessary to optimize the design of the motor brake system. The air defense system that is not designed properly has possibility of low performance of the gun turret and environment of operators.
The previous air defense system had such flaw in its design and it caused much noise and current in the operation of the turret. In order to resolve this flaw, we changed the position and design of the components of the motor brake system to reduce load and achieved the 62.5% reduced current and 40% reduced noise of the motor brake system compared to the previous design.
4,000원
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