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 제3호 (2017년 6월) 23건
1.
2017.06
구독 인증기관 무료, 개인회원 유료
The diffuser is effective in closed systems, however, its effect is weaken in open or free flow situations. This can be solved by modifying the rear-end of the diffuser in a manner that enables the formation of strong vortex. By doing that, a large portion of fluid's energy is converted to vortex's dynamic energy, which results in the deduction of static component, or in other words, the decrease of pressure. This study involved the design of rear-end part for efficient hydrodynamic performance of shroud diffusers, and demonstrated with numerical simulation by computational fluid dynamics (CFD). This study focuses on the use of brim end for the shroud where the effect of brim's length and attaching angle are analyzed.
4,000원
2.
2017.06
구독 인증기관 무료, 개인회원 유료
The object of this container is to store uranium precipitated in Mo-99 production process for long term. It will be used in the Gijang reactor. Uranium precipitates is stored in a container such as a form of filter cake. This container will be stored in the underground concrete storage for about 50 years when considering a storage facility life and safety. It is required high degree of structure integrity when considering decay heat from radioactive precipitated, external impact and etc, because it has to store radioactive materials for long term. In this study, thermal, structural and impact analysis about a container inserted 6 canisters was carried out. In the case of this thermal analysis, the object is to investigate the effect decay heat of uranium precipitate on the structure integrity of a container. The structural analysis was carried out to evaluate a structure integrity of the bottommost portion container among the 9 loaded containers. Finally, the impact analysis was carried out to evaluate the structure integrity of a container when that is dropped from maximum height of 5m during transport. As a result of this study, the structural integrity of this container is satisfactory about thermal, structural and impact.
4,000원
3.
2017.06
구독 인증기관 무료, 개인회원 유료
SUS bars such as 304, 316 series have been widely used to manufacture the adapters and fittings, which include many hexagonal bolts and nuts. The purpose of this study is to investigate the characteristics of heat conduction of SUS bar according to rotation of cutting tool. Temperature distribution in SUS bar can be achieved by using numerical analysis of heat conduction, thus it may be of help to the optimal operation of peeling machine. As the results, as the rotation of cutting tool is increased, both maximum cutting temperature and depth of heat conduction are decreased. Moreover as the angle of SUS bar is increased, it shows that maximum cutting temperature is decreased, on the other hand, depth of heat conduction is increased.
4,000원
4.
2017.06
구독 인증기관 무료, 개인회원 유료
The fracture of mechanical structure is caused by internal cracks in the material. Particularly, the fracture can also be seen to happen under the stress that is lower than yield strength in case of high strength steel because of the crack happening from the defect inside the material. In this study, high strength steel with four holes near the center crack were designed by angle and fatigue experiments, and the simulation analyses to verify the experimental results were carried out. As the results of this study, the crack growth rates are shown to be 0.000485, 0.000434 and 0.000422 respectively at the inclined angles of center crack as 22.5°, 45° and 67.5°. The maximum deformation energies become 0.0848mJ, 0.0603mJ and 0.0582mJ respectively at the inclined angles of center crack as 22.5°, 45° and 67.5°. It is thought that this study result can be utilized as the basic data at the study on the material existing with the defects of crack and hole.
4,000원
5.
2017.06
구독 인증기관 무료, 개인회원 유료
Improvement of living and life style led to increased sales of frozen milk products, such as ice creams or ice bars. These frozen milk products are commonly stored in a small refrigeration stocker. R-502, which has long been used as the refrigerant of a stocker, is being replaced with R-404A due to the ozone layer depletion issue. In this study, thermal analysis was conducted for the stocker, and the results are compared with experimental data. For the compressor analysis, performance curves were used. Evaporator or condenser was discretized into small volumes, and energy balance was applied. Capillary tube was also discretized into small volumes, and energy and momentum balance were applied. Comparison with the test data of the stocker having 500 liter internal volume revealed that the condensation or evaporation temperature was predicted well except for the initial start-up period. Slightly lower prediction (maximum 4oC) was obtained for the stoker room temperature at the initial operation period. The effect of radiation heat transfer for prediction of the stocker room temperature was assessed.
4,000원
6.
2017.06
구독 인증기관 무료, 개인회원 유료
In product development, different divisions and businesses often have heterogeneous CAD/CAE systems and methods for expressing product data, and addressing this heterogeneity creates additional costs and causes longer development periods. To ensure successful collaboration in the design process, it is therefore imperative that different CAD, CAE, and other related systems be managed in an organic and integrated manner from the initial stages of product development. Therefore, this study suggests an integrated CAD/CAE system including optimal design in a more effective and integrated manner but also to support interfacing and the collective use of design and analysis tools. To validate the proposed method, a stiffened plate example is taken as an example. It is found that the proposed method could overcome the bottleneck of CAD and CAE such as transferability of data, though CATIA and ANSYS are used at the moment.
4,000원
7.
2017.06
구독 인증기관 무료, 개인회원 유료
The object of this study is to compare the shock isolation characteristics of the commercially available rubber washers due to the difference in a tightening torque and hardness. Drop impact test using a steel ball which can simulate the pyroshock acceleration was devised. The test results show that silicon had the highest shock isolation performances followed by urethane, nitrile showed the least performances. In addition, the test results show that the smaller a tightening torque and hardness, the shock isolation characteristics are improved. And this study propose an analysis method using the shock transmissibility function in order to minimize some uncertainty of the impact excitation in the shock response spectrum analysis.
4,000원
8.
2017.06
구독 인증기관 무료, 개인회원 유료
Warpage of injection molded product is caused by non-uniform shrinkage and residual stress. A method of removing uneven molding shrinkage and residual stress is to remove the defective factor to Uniform cooling of products. Warpages for part designs have been investigated in this study according to the injection molding conditions for amorphous ABS and crystalline PP by the rapid cooling and heating system. Experimental results showed that the crystalline resin was more warped than amorphous resin, Warpages have been observed in the regions of the part, near gate region and flow direction region.
4,000원
9.
2017.06
구독 인증기관 무료, 개인회원 유료
The test was done on cars travelling at the speeds of 20km/h, 60km/h and 100km/h using the performance testing mode for chassis dynamometer. In this test, the secondary ignition waveform, exhaust emissions and fuel consumption were measured in case of faulty MAP sensor, faulty oxygen sensor and spark plugs. The following results from the related analysis of secondary waveform, emission and fuel consumption measurements were obtained : 1) The fuel consumption was higher in the order of oxygen sensor trouble, MAP trouble, spark plug trouble, before maintenance and after maintenance. Maximum fuel economy is 9.3km/L, the minimum fuel economy is 3.2km/L, the difference between max. and min. is 65.5%. 2) If you compare the oxygen sensor trouble with after maintenance, the CO has improved an average of 98%, fuel economy average of 60%. And the HC has improved an average of 87%, fuel economy average of 60%. The fuel consumption and exhaust gas was bad in the order of oxygen sensor trouble, MAP trouble and S/P trouble.
4,000원
10.
2017.06
구독 인증기관 무료, 개인회원 유료
Three-dimensional motion analysis systems and force plates are used for gait phase detection and ground reaction force(GRF) or ground reaction moment(GRM) data collection. But force plates as measurement systems are restricted to laboratory environments and have limitations for abnormal walking with foot dragging. Therefore the methods were proposed to compute the GRM from the kinematic data of three-dimensional motion analysis systems. Gait phase detection with kinematic data using foot velocity algorithm(FVA) was performed. The validity of gait phase detection was obtained comparing with the results of force plates. A gait model with 7 segments was composed to compute GRM. The results of gait model with kinematic data were compared with those of force plates. The result of the vertical direction is similar. But anterior-posterior direction and lateral direction show similar tendency with some gaps.
4,000원
11.
2017.06
구독 인증기관 무료, 개인회원 유료
This paper is on developing the waveform analysis method in driving control of solenoid injector of CRDI diesel engine. The experimental methods using Pico oscilloscope and scan tool is employed to measure current and voltage waveform of solenoid injector. The solenoid injector are used 1 normal and 2 abnormal injectors. The experiment is carried out during no-load condition. The magnitude of pressure drop is largest main duration, pre and pilot duration in the order named in case of normal injector, whereas was largest pilot duration, pre and main duration in the order named in case of abnormal injectors.
4,000원
12.
2017.06
구독 인증기관 무료, 개인회원 유료
The aim of this paper is to clarify the structural stability of Refracted Telescopic Boom in 30m Class with the Property of Working Range Insulation. The boom of insulation special vehicle consists of a 3-stage telescopic boom, 2-stage refracting boom, insulation boom and effector. The catia solid geometry of the boom was used to generate both a basic ADAMS model and the finite element meshes for the flexible components. The flexible bodies were generated by using the finite element program of ANSYS and then imported into the ADAMS model and their flexibility accounted to the dynamic analysis of boom. Embedding finite element representations within the ADAMS model, offers the advantage being able to perform the durability analysis and the resulting damage. Through this approach, the crack locations(hot spots) in a prototype can be predicted successfully, thereby validating the analysis procedure.
4,000원
13.
2017.06
구독 인증기관 무료, 개인회원 유료
Marine structures developed for marine industry and resource manifests different fluid characteristics. As such, the changes in the location, shape and size of these structures affect the fluid flow. Specifically, this wake flow caused by the structures result in environmental damage and topographical change. but on the other hand, protects harbor facility and environment. This study was conducted by changing the position of vertical plate in horizontal and vertical direction and experimented the variation of wake flow by PIV. This experiment confirmed the wake flow reduction by the changes of gab in horizontal and vertical direction. Particularly, the experiment showed that changes of gab in horizontal and vertical direction resulted in an increased u-velocity fields in the back of structure for larger horizontal gab.
4,000원
14.
2017.06
구독 인증기관 무료, 개인회원 유료
Lithium ion batteries have been extensively used in portable electronic devices due to their high energy density and long cycle life. Recently, lithium ion batteries are required to run conditions that drive up to 1.5C, 2.0C, or higher in order to produce quick charge secondary cells, but the life degradation and safety concerns and rising. In other words, as the number of repetitions of the charge and discharge increases, the binding between the active materials and the ionic conductors becomes loose, and the contact resistance between the particles increases, and due to the increased resistance of the electrode, the battery performance is degraded, and during the life cycle degradation of cathode and anode materials occurs, and it is directly linked to life and safety issues. This study aims to improve the quick charge performance by improving the lithium ion material.
4,000원
15.
2017.06
구독 인증기관 무료, 개인회원 유료
There is a considerable amount of research on metal material product worker’s hearing loss caused by noise that comes from manufacturing process. A further investigation that characterizes the sound that comes from manufacturing process of metal material products. however. To do this, a noise management plan is needed. It should include a generated sound process from the main sources of disturbance at manufacturing process areas. And a soundproof measurement will identify the amount of noise reduction needed for a hearing-safe working environment. Finally, researchers in this study measured tests on the noise and the vibration process, and the noise caused by operations allowed for an investigation on the suitability of certain environmental conditions. Noise-related programs can be used to predict the noise distribution of the noise level characteristic. This can help identify and reduce the presence of sound interference through sound proofing measures.
4,000원
16.
2017.06
구독 인증기관 무료, 개인회원 유료
The object of this study is to improve the straightness in tubular shaft production. Die bearings of 1, 2 and 3 were inserted onto the lower die, respectively. In this study, the tubular shafts at the stage 5 were modelled as the standard and error cases. The error case assumes the production error of raw material. The coefficient of friction was set to the Oil_Cold conditions as referring to the analysis library. In the results, the effective stress was observed homogeneously on the distribution at yoke top in standard case. However, the effective stress was observed on the distribution at long section of yoke in case of the raw material with error. The metal flow line was stretched straight in standard case. On the other hand, the metal flow line was bent in all of error cases. The biggest displacement occurred when only one die bearing was applied. The smallest displacement occurred when two die bearings were applied in lower die.
4,000원
17.
2017.06
구독 인증기관 무료, 개인회원 유료
This study aims at providing a basic data for the development of high energy efficient environment system in the cage (poultry buildings) and cold potable water supply to reduce the summer heat stress. For this study, the cage area size was 273m 2 and the air-to-water heat pump capacity was 20RT for heating and cooling. As the result of this study, the temperature of the drinking water supplied by heat pump was maintained at the set temperature of 15℃. However, the water temperature of control was 23~28 ℃ due to the effect of outside temperature. The average internal cage temperature was 25.3 ℃ in the test group and 28.1 ℃ in the control group, which was 2.8 ℃ higher than that of the control group. The relative humidity was 76.2% in the test group and 75.0% in the control group. The broiler drank 23.2 L / day in the test group and 21.5 L / day in the control group. Daily feed intake was 937 g and and 725 g in the cold water and control water respectively. The feed intake of 212 g was higher than that of cold water. The feeding rates were 1.8 and 1.9. Body weights were 1,523 g and 1,164 g in the cold water and control water respectively. The weight gain was 359 g in the test group fed with cold water and 392 g in the control group. When compared with the control group, the mortality rate was reduced by 84% in the cold water feeding test. It is necessary that future research will continue to reduce the incidence of such livestock accidents.’.
4,000원
18.
2017.06
구독 인증기관 무료, 개인회원 유료
In this study, we investigate the mechanical and metallurgical properties of the gas metal arc welding. According to flux cored arc welding parameters during welding ATOS80, improving the working conditions of the welding industry to use high strength steel ATOS80 we propose to. Weld test is the tensile strength, yield strength, elongation, hardness, brittleness, such as macro-structure check of the mechanical properties and the weld, the microstructure inspection, defects of the weld subjected to radio-graphic inspection and tissue after welding the test pieces according to the condition variable comparative analysis was investigated by the state.
4,000원
19.
2017.06
구독 인증기관 무료, 개인회원 유료
4,000원
20.
2017.06
구독 인증기관 무료, 개인회원 유료
The objective of this study is to solve the problem that was occurred during the spline processing in A-IMS tubular shaft. The upper dies were modelled conventional case and modified case. The tubular shafts were modelled as standard case and error case. The error case assumed production error of raw material. The material of tubular shaft was set to SCM 420H as refer to the analysis library. The simulation results were analyzed and compared in terms of metal flow, effective stress, and effective strain characteristics. The crushed and buckling problems were observed at the upper side of tubular shaft body when conventional upper die was applied. However, the crushed and buckling problems were solved when modified upper die was applied.
4,000원
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