본 연구개발은 2m 이상 대형 석재에 대한 가공기계 개발에 관한 것으로서, 종전에 강철재 원형톱을 회전시켜 석재를 절단하던 방식을 개선하여 와이어에 공업용 다이아몬드를 장착한 와이어 쏘우를 절단도 구로 채용하였다. 또한 부수장치로 거대 석재를 전후좌우 및 회전이 가능하여 다각도 가공이 가능하도록 턴테이블식 공작물 베드를 설계 및 개발하였다. 한편 대형 석재 가공기계는 대부분 중국산 기계가 수입되어 사용되어지고 있으며, 이로 인한 장비 관리 및 사용에 있어서 여러 가지 불편한 점들이 산재해 있으나 국내 생산 제품이 전무하여 불편함을 감수하면서 어렵게 국내 석재산업을 유지하여 오고 있는 실정이다. 따라서 본 개발을 통해서 국내 석재산업의 활성화를 기대해 본다.
The objective of this work is to investigate the A-IMS structural defects on the tubular shaft and solid shaft by analyzing the under-fill, metal flow, effective stress and load characteristics. The tubular shaft and solid shaft were designed 6 stage process by upper and lower die. The results were analysed by using a finite elements analysis method. The coefficient of frictions were set Oil_Cold conditions as referred to the analysis library. It was found that the actual under-fill phenomenon was not observed in both tubular and solid shaft. The load values of tubular and solid shaft were 520ton and 255ton, respectively. These values were under the limit of forging machine maximum value.
The air conditioner is an instrument to make a low degree fresh wind by compress a refrigerant and through the heat exchanger. As change a refrigerant of low degree and low pressure to high degree and high pressure, it is needed to the compressor. The compressor compress a refrigerant by transfer the rotational energy to reciprocating energy.
The goal of this research is for easy use to failure diagnosis of an automotive compressor according to vibration characteristics of each failure types of automotive compressor. To do this, we have prepared the normal products and made some detective products which several kinds of detective types to measure and analysis of vibration characteristics. From the results, we have made a close investigation into the vibration characteristics of each kinds of detective type.
In this study, SCM440 alloys are investigated to research the effect of wear resistance. For this purpose, three wear factors which are friction force, wear loss and coefficient of friction applied to test wear-resistance. For the wear test, ball-on-disk was used to assess the variation of wear characteristics. Lastly, the coefficient of wear was calculated by using the Archard's wear equation in SCM440 alloys. The applied normal load was fixed at 30N in all test. The test results showed that SCM440 alloy's Vickers hardness average value is near 671.4Hv, the friction force is 4.11N through the Ball-on-disk test, the coefficient of friction and the wear loss are 0.431 and 0.080 respectively. Finally, Archard’s wear value of SCM440 alloys could be shown approximately 0.1514.
This study elucidates the effect of wear resistance in Forging S45C. Three wear factor which are wear loss, coefficient of friction and friction force could conduct an experiment of wear-resistance test. First of all, wear test of ball-on-disk has been performed using steel balls to determine the variation of wear characteristics. Finally, the coefficient of wear was calculated by the Archard wear equation in hot forging S45C.
In this research, we developed flag-raising machine operates smoothly even in the external environment such as slope and wind by 'guide' which guides inserted flag. In addition, even at the time of the output of this flag-raising machine, curling flag inside does not occur. to evaluate this machine, we develop system that can tilt the machine. and evaluate its performance by calculating difference between flag's right and left length after flag is output or inserted respectively. in this result, even in some slope, its input/output performance operates well, also curl doesn't occurred inside This system has the advantage that the flag-raising as well as can be applied for various advertising system.
This study is for the safety display device to the transportation of the road that are installed on the boundary stone. This device includes an upper side that is located and fixed on the boundary stone top, and a side that is fixed on the boundary stone front. Solar cell convert light of solar to electric energy is equipped inside the upper side. the device’s side part is consisted 3 part. the charging unit for charging the electric energy generated from the solar cell to charge the battery, the illuminance sensing unit for detecting the night, and the LED unit for flashing traffic sign in night. furthermore this device can be installed easily on the boundary stone. and it can help driver to aware road and boundary stone by improving visibility in night time.
This paper analyzes the technological competitiveness of biomimetic robot. By analysing papers on biomimetic robots published from 1996 to 2016, We were able to identify the biomimetic robot paper clustering and competitiveness of research institutions. Biomimetic robot's papers searched by SCOPUS database are classified in 6 clusters. According to clustering analysis, the papers have applied in the sequence of underwater robot(31.28%%), robot actuator(20.57%), ground robot{20.51%), humanoid robot(12.72%), robot sensor(9.28%) and micro flying robot(5.65%).
In this study, the fracture property of the bonded structure with aluminum foam is analyzed by using the closed aluminium foam for impact absorber. DCB and TDCB specimens manufactured with the single lap joint method of mode 3 are designed by varying the thickness. The static analysis through ANSYS finite element program is carried out on the specimen model due to each thickness. Also, the static experiment is performed in order to verify the analysis result. This study aims at comparing the shear strengths of the bonded structures of DCB and TDCB made with aluminum foam and investigating the mechanical properties.
This study investigates the safety and life during the fatigue load by the configuration of seat frame. On back frame at seat frame, the life and damage are analyzed. The deformation and equivalent stress are compared with each other through the vibration analysis, The result of this study through the analysis can be applied to develop the automotive seat frame with durabilty and safety.
This study is implemented the impact analysis of leveling system used to maintain the level of jacket structure in construction of jacket structure for wind turbine which widely used in offshore wind power. The major problem during the construction of offshore wind power is that a tower or bottom structure which are supporting structures of the generator are passing above the jacket, and it is necessary to maintain its leveling by accurately measuring the level of the jacket while constructing. Due to its purpose, the level of jacket is adjusted with the leveling system which operates hydraulically, but the leveling system inevitably exposed to the impact load during the pile drive. This study interpreted the influences of impact during the design or construction of the leveling system by considering the interaction between the ground and the jacket structures.
석재 굴림석을 보도 및 건축석으로 사용하기 위해 석재 굴림통 시스템을 제작하였다. 이 시스템을 사용하여 굴림석을 제작한 다음 굴림석에 대하여 기계적 성질을 측정한 결과 다음과 같은 결론을 얻었다. 석재 굴림통 시스템의 대한 출구부와 입구부에 대하여 굴림통 출구부 보다 입구부에서 진동이 높게 측정되었다. 포천석으로 만들어진 석재 굴림석에 대하여 압축강도, 흡수율, 비중을 측정한 결과 122MPa, 0.2%, 2.64g/m3을 얻었다. 포천석 석재 굴림석에 대하여 치수 정확도를 측정한 결과 표준편차가 0.02 이하로 측정되었다. 포천석 석재 굴림석에 대하여 굴림도를 측정한 결과 92.5% 이상의 R15 값이 측정 되어 측정되었다.
최근 IT 기술과 융합된 차량에서 농기계산업으로 넘어오는 과도기가 도래하면서 농업용 기계의 용자의 사용과 유지보수의 편의성 증대가 요구되고 있다. 본 연구에서는 다양한 농업용기계에 적용이 가능하고, 농경상황을 실시간으로 모니터링이 가능하도록 4개의 카메라를 활용하여 확보한 영상으로 개별 또는 4채널로 영상을 통합할 수 있는 영상믹서를 개발하고자 한다. 또한 농업용 트랙터 국제표준인 ISO11783 표준기반으로 SW를 개발하고 수요처에 납품 가능하도록 설계하였다.
This study is to develop an export 1050MPa-class lightweight ductile iron castings Austempered control arm through the research process to obtain the following results. First, the structure of the optimal design Layout design and development of the component, and then achieve them through the Control Arm rigidity and optimal structure design and robust design of the focus areas of the expected stress Control Arm. Second, to develop a Control Arm reflects the high rigidity and high performance lightweight structures. Control Arm them developed to meet the design and rigidity as required by the consumer through the hollow, and to develop a process for the Core. Third, through optimum alloy composition and heat treatment methods will be derived to derive the amount of iron alloy (Cu, Ni, Mo) and Austempered heat treated and tempered condition. Fourth, through the development of optimum molding technology development component to develop the optimum ADI for the low-stiffness, high-rigidity component development, it attempts to develop a high-strength casting forming technology.
By development with a one-piece support ring containing the hybrid vehicle in this study by cooling to obtain the following findings. First, we analyze foreign hybrid vehicle SUPPORT RING product. Second, the design and development targets SUPPORT RING optimum shape. Third, Prototype FCD500 appearance (wooden) cores and tries to mold design and production. Fourth, the manufacturing technology developed cores of high rigidity, low-expansion unit for the formation channel. Fifth, the development of the casting process technology to remove the channel buttress part shrinkage defects and bubbling. Sixth, to produce a casting SUPPORT RING FCD500 with cooling channels. Seventh, SUPPORT RING performs the CAE analysis for Prototype Casting casting mold development. Evaluate the eighth SUPPORT RING FCD500 casting with cooling channels. Ninth, cooling channels parts Pneumatic 2bar. And securing the confidentiality satisfying 0.5cc / min. Finally, a review of the assembly performance of the prototype.
This study will develop a small ship, boat, It is available a versatile system to rock like a shower, as well as drinking water by desalination of sea water just offshore yachts, etc. to be applied to their own country.
In this design the element technology development part design and the point in the system was designed to be compactly mounted to a boat or the like is applicable. To work in the maritime industry, as more and more leisure development becomes a sail to load large amounts of water before departure, such as the drinking water is to give an adverse effect on fuel consumption with the increase gigyul eojim and the weight of the hull during loading increased due to set sail. Therefore, the present study was to compensate for this disadvantage by designing the first time in Korea Development wishes to contribute to import substitution effects were developed with an emphasis on practical application.
This study is intended to secure seolge and structural strength of the suspension as necessary amphibious boat amphibious facilitate a possible amphibious boat 7m parenting class. Developed a technique for mounting a three-wheel drive track traveling device to medium-sized vessels, and the control device in order to improve the efficiency of the safety and operation of this device, the braking device of the land driving, the steering apparatus and the linear adapted to install the device development and installation of the wheels on the bottom, leaving space travel wheel award during lift pockets (wheel pocket) analyzed the impact of the ship resistance and stability, and tried to improve the problem.
In this study, the buckling restoration at CFRP 3-Point bending specimen composed of 30°, 45°and 60° is investigated when the pressure at the lowest position on the compressed specimen is eliminated. The fracture configuration and stress contour of the specimen can be seen according to the laminate angle of fiber. The result of this study is thought to apply the data for the safe design of CFRP structure.
Recently, in construction vehicles like exacavator, many customers demand the interior parts to be convenient and handy to operate. Futermore, that parts had to be more lightweight and better quality and durability. For this reaseon, the combination switch, a part for operation of head lamps, wipers, horn, etc, had been designed as a new lightweight structure by using PA plastics material and had been changed the mechanical contact into electric non-contact by using Hall IC and FET.
덕트에 설치되는 오리피스는 압력과 유량 제어용으로 많이 활용되고 있다. 선박의 거주 구역에 통풍 덕트는 환기와 배기를 위해 설치되며 및 선박의 설계 및 건조 후 검사는 공기 유속과 유량 그리고 소음 기준에 대해 수행된다. 이 연구에서는 선박의 선실 별 유량분배에 중요한 요소인 T-분지관을 대상 으로 오리피스를 적용한 경우 난류운동에너지 분포를 고찰하였다.