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
제23권 제4호 (2021년 8월) 29건
1.
2021.08
구독 인증기관 무료, 개인회원 유료
When operating at high speed on a vessel, a high-speed planing hull occurs nonlinear movements such as stern trim and large sprays. This phenomenon results in the hindrance of stability, embarkation and mission performance. Excessive stern trim during the slides decreases propulsion efficiency and visibility of helmsman due to porpoising and changing the attack angle of the fluid flowing into the propeller. To improve these problems, an outboard floating plate is installed on the cavitation plate to greatly suppress or eliminate the porpoising phenomenon. In this study, to analyze the performance of the floating plate mounted on the outboard engine, numerical analysis was carried out to investigate the resistance applied to the floating plate and the lift generated according to the change of the angle of attack and the flow velocity. The reliability of the floating plate mounted on the outboard engine was verified by applying the floating plate according to the speed and the angle of attack.
4,000원
2.
2021.08
구독 인증기관 무료, 개인회원 유료
The multi-layered heat source model is a model that can cover most of existing studies and can be defined with a simple formula. Based on the methodology performed in previous studies, the welding heat source was found through experiments and FEM under the welding power conditions of three cases and the parameters of the welding heat source were analyzed according to the welding power. In this study, parameters of fiber laser welding heat source according to welding power were searched through optimization algorithm and finite element analysis, and the correlation was analyzed. It was confirmed that the concentration of the welding heat source in the 1st layer was high regardless of the welding power, and it was confirmed that the concentration of the welding heat source in the 5th layer (last layer) increased as the welding power increased. This reflects the shape of the weld bead that appears during actual fiber laser welding, and it was confirmed that this study represents the actual phenomenon.
4,000원
3.
2021.08
구독 인증기관 무료, 개인회원 유료
Due to stricter environmental regulations of the International Maritime Organization (IMO), the number of ships fueled by Liquefied Natural Gas (LNG) is rapidly increasing. The International Code of the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk (IGC Code) limits the material of tanks that can store cryogenic substances such as LNG. Among the materials listed in the IGC Code, ASTM A553M-17 has been recently adopted as a material for LNG fuel tank projects because of its excellent mechanical properties at cryogenic temperatures. In shipyards, this material is being used to build tanks through Flux Cored Arc Welding (FCAW). However, there is a problem that magnetization occurs during welding and there is a big difference in welding quality depending on the welding position. In order to overcome this problem, this study intends to conduct basic research to apply laser welding to ASTM A553M-17 material. In Part I, the bead shape according to the welding output was analyzed and in PART II, the penetration phenomenon according to the welding speed was analyzed after Bead on Plate (BOP) test. As a result of analyzing the bead shape according to laser power performed in this study, it was confirmed that the laser power and penetration depth are proportional to some extent. In addition, a range of suitable welding power was proposed for the 6.1mm thickness material performed in this study.
4,000원
4.
2021.08
구독 인증기관 무료, 개인회원 유료
Parts made from CFRP materials are fabricated by hand or using automated layup and forming techniques. Finishing must be performed to meet the requirements for the necessary dimensions and geometry to facilitate assembly with other component parts. Parts such as airplane wings require trimming, milling and drilling to make CFRP into its final shape. In this study, the machining characteristics of CFRP were evaluated by manufacturing an end mill with a changed helix angle of the end mill. The cutting force was the lowest at the helix angle of 60 degrees, but the peeling state of the surface was the best at the point angle of 45 degrees.
4,000원
5.
2021.08
구독 인증기관 무료, 개인회원 유료
In this paper, we break away from the method of removing and inspecting the GDI injector, measure the pressure change of the fuel rail pressure sensor when driving the GDI injector of a vehicle equipped with the GDI fuel system, and compare the results. analyzed.There was a pressure change in the fuel rail pressure sensor from the general drive GDI injector. There was no pressure change in the fuel rail pressure sensor when driving the GDI injector without injecting fuel. You can check the fuel injection status in the pressure change data of the fuel rail pressure sensor without removal the GDI injector.
4,000원
6.
2021.08
구독 인증기관 무료, 개인회원 유료
Diesel engine is used many industrial fields such as ship, power plant and big-sized vehicles and so on. Roto cap is one of the parts of system of intake and exhaust valve. Roto cap consists of body, disc spring, spring & steel ball, retainer and stop ring. Disc spring is known as taking cyclic load and cyclic load leads to fatigue damage. This study aims to investigate the stability of disc spring due to fatigue damage. As the results, the fatigue life of disc spring according to cylic load could be predicted using fatigue analysis. Consequently, disc spring showed the stability of about 1.7~2 times for criterion load of 1370N.
4,000원
7.
2021.08
구독 인증기관 무료, 개인회원 유료
This study was conducted for the purpose of suggesting a standard that can be used under ambient temperature by improving the low mechanical and thermal properties of ABS. PC was used as a filler, and post-curing conditions of the ABS/PC blend injection material were investigated. It was found that the ABS/PC blend injection material having a PC content of 20 wt.% or more showed little change in tensile properties at a temperature of 50°C, and a decrease in tensile properties of less than 10% at 80°C.
4,000원
8.
2021.08
구독 인증기관 무료, 개인회원 유료
Thermal and wind panels are installed on offshore oil and gas platforms to protect personnel, equipment and structures. However, in general, panels are designed and manufactured through trial and error based on performance tests. For this reason, it is difficult to develop and design a heat sink in the Korean shipbuilding and offshore equipment industry due to the lack of performance test data and limited experience. In this study, the experimental results performed to verify the performance of the thermal and wind panels were analyzed, and the characteristics and performance characteristics of the thermal and wind panels were investigated. The conclusions drawn from this study will be useful in terms of the design and development of shielding.
4,000원
9.
2021.08
구독 인증기관 무료, 개인회원 유료
The event recording devices such as EDR and DTG have recently been developed and installed in automobiles. The reliability of EDR application is being conducted in many previous studies, but with the development and development of autonomous vehicles, it is necessary to study the reliability of EDR and DTG application results for programs that can analyze autonomous driving. Therefore, in this study, the analysis was carried out in a way to secure the reliability of the application results of EDR and DTG of Carmaker, which can analyze the traffic accident analysis program PC-Crash and autonomous driving, and secure the reliability of the Carmaker program that applied EDR in Korea and abroad. As a result of the analysis, it was found that the speed error rate gradually increased from high speed to low speed, and the maximum error speed was less than 5 km/h through the average error rate for each speed. In the future, it is thought that it can be usefully used for analysis of traffic accidents in the event of autonomous vehicle accidents.
4,000원
10.
2021.08
구독 인증기관 무료, 개인회원 유료
Application of a very high internal pressure on the thick-walled pressure vessel induces beneficial compressive tangential residual stresses near the bore of the pressure vessel after unloading the internal pressure. However, a reverse yielding due to the Bauschinger effect during the unloading process causes the reduction of the compressive residual stress near the bore. In order to evaluate the autofrettage residual stress distributions of the thick-walled pressure vessel, the Bauschinger effects were considered. Magnitudes of the compressive residual stresses at the bore determined by considering the Bauschinger effects decreased by about 25 percent, compared to the case of linear elastic unloading, i.e., without Bauschinger effects. Measured residual stress distributions agreed fairly well with the calculated distributions considering the Bauschinger effects.
4,000원
11.
2021.08
구독 인증기관 무료, 개인회원 유료
An important variable in the oil-water separation process is the size and dispersion diagram of the bubbles formed in the induced gas flotation(IGF). In this study, the influence of the behavior and characteristics of the fine bubbles generated in the IGF device on the oil-water separation performance was evaluated by a numerical analysis method. For this reason, it constitutes Grid system suitable for bubble characteristic analysis. By applying Reynolds-averaged Navier-Stokes equations, a continuous abnormal flow analysis model of water and air was established. For the numerical flow analysis model, we applied the Eulerian-Eulerian approach that can be used for the reaction model in which bubbles are formed at one point of the Euler method applied when the base is liquid. As a result, it was confirmed that the bubbles in the IGF device were evenly dispersed as the flow velocity of bubbles increased and the particle size decreased. Such a phenomenon was caused by changes in Reynolds number and drag related to the flow characteristics, and could be explained by Stokes' law of viscosity.
4,000원
12.
2021.08
구독 인증기관 무료, 개인회원 유료
In recent, fiber-reinforced composites have been widely used in many fields because of their excellent performance. In order to manufacture lightweight, high-performance, and inexpensive composites various laminated structures were designed. Six types of hybrid composites were fabricated with glass/basalt/aramid fibers by VARTM process. The effect of the laminated structure on the mechanical properties of composites was investigated through impact energy, tensile and bending strength. Compared to other conditions more higher impact energy was obtained when the aramid fibers were in the center position and more higher bending strength was obtained when the fibers are laminated in the order of increasing bending performance from top to bottom. The laminate structure did not affect tensile strength which mainly depends on the property of fibers.
4,000원
13.
2021.08
구독 인증기관 무료, 개인회원 유료
초록 In this study, the structural analysis of sway brace device for earthquake-proof which can fix a pipe installed in the building was carried out. The sway brace device was analyzed to evaluate not only the deformations of adaptor fitting, support brace member, structure attachment fitting and clamp sway brace fitting that compose it, but also the effective stress of adaptor fitting combined with support brace member by shear bolt. As a result of structural analysis, it can be seen that the deformation of support brace member influences most of the deformation of sway brace device and the design of adaptor fitting must be modified. Above all, it indicates that the sway brace device is suitable for Korea Fire Institute(KFI) approval standard since its total deformation is smaller than the maximum displacement proposed by KFI. The result of this study can be effectively used to investigate the effective stresses and deformations without the performance test of sway brace device according to its setting angle.
4,000원
14.
2021.08
구독 인증기관 무료, 개인회원 유료
In order to identify the CAN message sent from the ECU, the CAN waveform and operating current were measured during the operation of the CAN driver.CAN ID was identified in the same phase as the measured voltage waveform and operating current, and reverse engineering was performed .And, by measuring CAN bus wire EMI noise, it was tested whether CAN ID was identified.CAN ID verified ECU data using CAN analyzer.
4,000원
15.
2021.08
구독 인증기관 무료, 개인회원 유료
Due to stricter environmental regulations of the International Maritime Organization (IMO), the number of ships fueled by Liquefied Natural Gas (LNG) is rapidly increasing. The International Code of the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk (IGC Code) limits the material of tanks that can store cryogenic substances such as LNG. Among the materials listed in the IGC Code, ASTM A553M-17 has been recently adopted as a material for LNG fuel tank projects because of its excellent mechanical properties at cryogenic temperatures. In shipyards, this material is being used to build tanks through Flux Cored Arc Welding (FCAW). However, there is a problem that magnetization occurs during welding and there is a big difference in welding quality depending on the welding position. In order to overcome this problem, this study intends to conduct basic research to apply laser welding to ASTM A553M-17 material. As a result of analyzing the bead shape according to laser BOP speed and Energy density performed in this study, it was confirmed that the penetration and energy density are proportional but the penetration and BOP speed are inverse proportional to some extent. In addition, a range of suitable welding speed and energy density were proposed for the 6.1mm thickness material performed in this study.
4,000원
16.
2021.08
구독 인증기관 무료, 개인회원 유료
In this study, for the treatment efficiency of the IGF process for the treatment of produced water (PW) discharged from the oil sands plant, the bench-scale oil sands plant PWT package was designed, manufactured and evaluated to verify the efficiency of the process. The microbubble generation efficiency and microbubble size change according to the circulation pump pressure were observed, and the correlation between influent concentration and temperature, residence time and oil-water separation performance was analyzed.
4,000원
17.
2021.08
구독 인증기관 무료, 개인회원 유료
Numerical analysis for flow and noise characteristics of sirocco fan design factors is conducted in this study. 4 cases of blade angle(α=24°~30°) and 5 cases of RPM(390~1170RPM) are calculated. Flow characteristics are compared for the number of blades. Outlet flow rate is tended to decrease as the number of blades increased. There is little difference in the flow characteristics for the angle of blade. The highest outlet flow rate is predicted at α=24°, and the lowest at α=28°. Flow and noise characteristics are compared for α=24° and 26°. Outlet flow rate is almost similar in both cases, but noise for α=24° is predicted higher at high RPM conditions.
4,000원
18.
2021.08
구독 인증기관 무료, 개인회원 유료
An implementation of OSEK NM, a network management protocol for automotive embedded systems, has been defined. In this experiment, the NM ID of each ECU of the vehicle is reverse-engineered when the vehicle is parked with a discharged battery, and the power management status and error status of each ECU and node are identified through NM ID OPCODE analysis, Sleep status, and Wake-up status, LIMP HOME status, were analyzed. After analyzing the NM OPCODE to find the faulty ECU, remove the cause of the failure and analyze the sleep mode entry state.In order to prevent the vehicle battery from being discharged, additional research is needed on how to enter the forced sleep mode when a failure not related to vehicle security occurs.
4,000원
19.
2021.08
구독 인증기관 무료, 개인회원 유료
The prospect of the new railway construction has led to resistance from residents, partly based on noise and vibration issues. Particularly, as tracks often pass closely to residential dwellings, constructors are then required to take account of noise and vibration. So the prediction of noise and vibration for train is very important thing. The train noise and vibration nearby the elevated railway make one specific issue. For the elevated railway, this paper concerns the rolling noise by the wheel/rail and the structure-borne noise by the bridge. Based on the results, this paper proposes the source model of elevated structure-borne noise and the calculation model for elevated railway noise. Also prediction model is presented with rolling noise and elevated structure noise which are calculated by considering the power level of a source for one-third octave band, ground absorption and barrier deflection. A lot of empirical data is needed to predict the noise and vibration. And one of the best ways to control the wayside noise is to analyze the noise level.
4,000원
20.
2021.08
구독 인증기관 무료, 개인회원 유료
A heat pump system using wasted heat from thermal effluent to supply the heating energy can reduce energy consumption and emissions of greenhouse gases by greenhouse facilities nearby. The Jeju National University consortium constructed a heat pump system using the thermal effluent from the Jeju thermal power plant of KOMIPO to provide with cool or hot water to greenhouse facilities located 2.5km from the power station. In this paper, the system configuration of the heat pump system was summarized, and the results of operations for demonstration of a heating performance carried out during the winter season in 2018 were investigated. Therefore, if the heating control by supplying thermal effluent to the facility greenhouse, it can contribute to reducing the energy cost and improving quality.
4,000원
1
2
