한국기계기술학회지 [Journal of the Korean Society of Mechanical Technology]

간행물 정보
  • 자료유형
  • 발행기관
    한국기계기술학회 [Korean Society of Mechanical Technology]
  • ISSN
  • 간기
  • 수록기간
  • 등재여부
    KCI 등재
  • 주제분류
    공학 > 기계공학
  • 십진분류
    KDC 550 DDC 621
제20권 제4호 (26건)



자동차용 경량 알루미늄 5182 합금 및 샌드위치 판재의 성형성 평가


한국기계기술학회 한국기계기술학회지 제20권 제4호 2018.08 pp.389-394

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The objective of this study was to develop formability evaluation techniques in order to apply aluminum sandwich panel for automotive body parts. For this purpose, formability evaluation by using FLD (forming limit diagram) was carried out in order to secure the fundamental data for the measurement of sheet metal forming and the establishment of optimum forming conditions of the aluminum sandwich panel. From the results of these formability evaluation, the formability of aluminum alloy sheet which was the skin component for the sandwich panel was higher than that of sandwich panel. In addition, the formability of sandwich sheet which was made by present study was same as that of sandwich panel made by foreign country. Also, it was found that sandwich panel made in present study could have the excellent deep draw-ability when it was compared to the foreign made sandwich panel.



자동차 계기판속도와 속도테스터기, 내비게이션의 속도 오차 분석


한국기계기술학회 한국기계기술학회지 제20권 제4호 2018.08 pp.395-400

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The error between the speed display of the speedometer and the speed display of the navigation occurs in the process of driving the vehicle which makes most of the driver confused and also experience anxiety hence in this paper, by the car management law number 73 (2), tests were conducted with following procedures measured by standard speed tester to analyze the error clearly. The experiment was carried out by installing a car on a speed tester with a speed difference of 10km/h from 30 to 80km/h according to the manufacturer and the vehicle. The result was obtained by measuring differences of the speed display error between the speedometer and navigation when driving the car on the road at the same speed. With the standard speed gauge at 40km/h, error percentage of the speed tester and Morning was 15.9% (5.5km/h) and Sonata was 6.4% (2.4km/h). The error percentage between different car company models was 9.5%. With the standard speed gauge at 40km/h, the error percentage of speed displayed by navigation and Morning was 14.2% (5km/h) and Sonata was 5.3% (2.4m/h). The error percentage between different car company models was 9.6%(3km/h). It was shown that according to the standard safety and rules of the speedometer, the cars were manufactured considering the safety. The speed difference between the speed tester and the navigation was 1.7% (0.5km/h) for Morning, 0.6% (0.2km/h) and 1.1% (0.3km/h) for Trax.



인가 하중에 따른 센터필러의 구조해석

왕쩐후안, 권영철

한국기계기술학회 한국기계기술학회지 제20권 제4호 2018.08 pp.401-406

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Prior to the experimental and production stages of the center pillar, a structural analysis must be carried out at the design stage. The commercial software for the structural analysis at the design stage provides benefits such as cost-effective and time economy. In this study, the structural analysis was performed to investigate the stress and displacement characteristics of the center pillar for five types of the applied loads using SolidWorks. The equivalent stress was relatively larger on the outside plate than the inside plate. The maximum equivalent stress according to the change of the applied loads increased linearly in the range of 47~181%. The deformation was larger at the upper end of the center pillar, and the maximum displacement was linearly increased in the range of 35~187%. The analysis results of the center pillar according to the applied loads show that the location and distribution of the maximum stress and displacement of the center pillar can be predicted.



운전조건 하에서의 터보차저 커플링계의 역학적 거동에 관한 연구

홍성기, 최복록

한국기계기술학회 한국기계기술학회지 제20권 제4호 2018.08 pp.407-412

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Coupling is commonly used as a mechanical fastener to connect the turbine housing and the bearing housing in a turbocharger assembly. The finite element analysis was used to predict the structural behaviors of the coupling system, which could be caused by the bolt clamping force in the assembly process and the thermal deformation during turbocharger operation. The back plate is used to prevent gas leakage from the turbine housing to the bearing housing while the fixed pin is inserted to set the reference position between the two parts. Thus, in order to predict the mechanical behaviors of the coupling system numerically, the temperature distributions were calculated by heat transfer analysis based on the rated speed of the diesel engine. As a result of analyzing the structural characteristics of the turbocharger, the contact pressure of the back plate was influenced by thermal deformations whereas the bending deformation of the fixed pin was affected by the thermal deformation and the pin position.



차량용 IHX에서 핀 특성이 난류 유동에 미치는 영향

정석훈, 서현규

한국기계기술학회 한국기계기술학회지 제20권 제4호 2018.08 pp.413-419

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It is known that the cooling performance can be improved about 5~12% and the COP (Coefficient of Performance) can be improved about 10~15% when the IHX (Internal Heat Exchanger) was applied in a vehicle. Thus, the aim of this study was to observe the influence of the fins shape on the turbulence flow and turbulence kinetic energy gradient in IHX. All the applied parameters of the fin such as rotation angle, spacing ratio, height ratio and mass flow rate are changed. The governing equations for the flow motion simulation were applied to continuity equation and Navier-Stokes equation, and the turbulence model was applied by the Shear Stress Transport(SST) model, which has the advantage of turbulence simulation. As the rotation angles of the front and back fins were increased, the difference in the maximum turbulent kinetic energy gradient between fins was reduced. As the inlet flow mass increased, the turbulent kinetic energy difference between front and back fins were increased. The turbulence area tended to increase with increasing fin height ratio.



BN 첨가된 AISI P20 금형강의 밀링 가공에서 공구 마모와 표면거칠기 특성에 관한 연구

황성국, 이정환, 류시형

한국기계기술학회 한국기계기술학회지 제20권 제4호 2018.08 pp.420-426

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As product diversity increases and product life cycle gets shorter, lead time reduction and manufacturing cost saving of die & mold are getting important in machinery, automotive, and electronics industries. To develop a novel free-machining die & mold steel, we try to modify the chemical compositions of AISI P20 mold steel by adding boron, nitride, and sulfur. After making three types of mold steels which are base metal of AISI P20 mod., boron and nitrogen added, and boron, nitrogen, and sulfur added to the base metal. Milling tests are carried out using TiN, TiCN, and TiAlN coated WC end-mills under various cutting conditions. Boron and nitrogen added steel machined by TiN coated tool shows the most excellent tool wear and surface roughness characteristics. The results might come from BN inclusions in base metal acting as a stress concentration source and lowering strain resistance during cutting process. The relationship between tool wear and surface roughness are also discussed including feed rate effects.



절삭유 공급장치용 열교환 필터의 구조적 안정성 평가

김봉환, 이창열

한국기계기술학회 한국기계기술학회지 제20권 제4호 2018.08 pp.427-433

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As the demand for high-speed and high-precision machining increases, the need for cooling and filtering of cutting oil is high. A new concept of coolant heat exchange filter is developed by installing cooling coil through which refrigerant(R410-a) passes through the coolant filtering device. For structural safety evaluation of the heat exchanger filter for cutting oil suppling device of machine tool, thermal stress and vibration analysis were performed using ANSYS program. The results of structural and thermal stress analyses have led to the conclusion that the cooling system has structural stability. From modal analysis, first natural frequency is 12.37 hz and deformation is 22.041 mm. Sixth natural frequency is 26.887 hz and deformation is 25.563 mm.



강성 확보를 위한 단면 홈 적용 자동차용 서브-프레임 사이드 멤버의 하이드로포밍 공법 설계


한국기계기술학회 한국기계기술학회지 제20권 제4호 2018.08 pp.434-438

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The hydro-forming design process of the sub-frame side members was studied using a high strength steel of 440 MPa in tensile strength. In the part design stage of the side member, the cross section analysis and the overall process design of the part shape were done. In the detailed simulation results, the maximum thickness reduction rate due to hydro-forming was predicted to be 13% and this was predicted to be a safe level without cracking. The end curvature was reduced to increase the stiffness of the part to design more secure parts and two types of grooves were added to the cross section and compared. The thickness reduction rates of the narrow and wide were improved by 18.6% and 15.6%, respectively when the narrow and wide grooves were added.



절삭유 공급장치용 열교환 필터의 냉각특성에 관한 연구

김봉환, 이창열, 정만재, 성종은

한국기계기술학회 한국기계기술학회지 제20권 제4호 2018.08 pp.439-445

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Currently, the cutting oil supply device is not equipped to cool the cutting oil. Therefore, additional cooling device should be connected to cool the cutting oil. This has the disadvantage of increasing the size of the device and reducing its cooling capability. To overcome these shortcomings, cooling coils are applied to the outside of the cutting oil filtering device to develop a heat exchanger filter for simultaneous coolant filtering and cooling to improve the compactness of the cutting oil supply device and cooling capability of the cutting oil. For the development of heat exchanger filter, flow and heat transfer analysis were performed. Due to the small heat transfer area of 10 cooling coils, less heat exchange occurred. In the 20 cooling coils, the coolant cooling coils prevented smooth flow of the cooling oil in the heat exchanger filter. The cooling efficiency of the 15 cooling coils were best, and the cooling temperature decreased non-linearly as the supply flow rate of the cutting oil increased.



AISI 1536.V와 AISI 4330 재질별 제조 공정에 따른 잔류응력에 관한 연구

황성국, 문정수, 김한주

한국기계기술학회 한국기계기술학회지 제20권 제4호 2018.08 pp.446-451

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To improve life time of machine components, higher alloy grade materials are used by adding more metal alloy components and content. Also production processes are further complicated and subdivided such as the forging, preliminary heat treatment, quality heat treatment, rough machining and finished machining process. Those reasons become major cause of large stress in the materials, and the residual stress generated during the manufacturing process causes fatal defects, such as crack, surface tear, warping and deformation of the products. It is necessary to evaluate the residual stress on the entire processes, from forging process to final finished machining process. Also in order to avoid those problems caused by residual stresses, it is necessary to know in advance what process is important to be controlled and what parameters affect residual stress. By the hole drilling method, residual stress was measured in each manufacturing process step. In this study, the hardness of the surface, the cutting force test and the metal analysis were performed to clarify the influence of manufacturing process parameters.



3실 에어컨 냉방 및 초기기동 특성에 대한 실험적 연구

양동학, 왕쩐후안, 권영철

한국기계기술학회 한국기계기술학회지 제20권 제4호 2018.08 pp.452-457

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The cooling operating characteristics of the 3 room air conditioner are experimentally investigated for the number of the indoor units (A, B, C) and the operating conditions (standard, overload) under the cooling operation. The cooling capacity and COP were calculated using a multi-type calorimeter. Also, EEV opening, compressor frequency, and superheat degree were obtained when the compressor started. From the experimental results, we can see that the performance and operation characteristics of the air conditioner depend on the indoor unit operation method. In case of simultaneous and single operation, the cooling overload performance was measured lower than the standard condition. Also, in the overload operation, the power consumption of the compressor was greatly increased and the COP was also decreased.



A Fusion Control for a Flexible Manipulator using PID Controller and BELBIC

I. H. Hong, J. W. Chung, C. Y. Oh

한국기계기술학회 한국기계기술학회지 제20권 제4호 2018.08 pp.458-466

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This paper proposes a fusion controller combing an anti-windup PID controller and BELBIC (Brain Emotional Learning Based Intelligent Controller) for controlling the position and vibration of a robot system having a single flexible manipulator. A finite element model of the flexible manipulator is developed. The reliability of it is verified by comparing the natural frequencies computed using the finite-element method with the experimentally measured ones. An MSC.ADAMS computational model of the robot system is interfaced with the proposed controller in MATLAB/Simulink, for carrying out a simulation. The simulation is performed with various references inputs and endpoint masses. The effectiveness and robustness of the proposed controller for control of the position and vibration of the flexible manipulator is shown through the simulation.



자동차 센터필러의 측면충돌에 관한 시뮬레이션 해석

왕쩐후안, 권영철

한국기계기술학회 한국기계기술학회지 제20권 제4호 2018.08 pp.467-472

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Prior to the design and production stages of the center pillar, the structural analysis must be carried out at the concept stage. Commercial softwares for the structural analysis provide benefits such as performance prediction and deformation. In this study, the structural analysis using SolidWorks was performed to investigate the stress and displacement characteristics of the center pillar for two types of collision positions and velocities. As the impact velocity increased, the maximum equivalent stress and displacement of the center pillar were larger. In the case of passenger cars, the equivalent stress and displacement according to the velocity change increased by about 133% and 116% at 16.5m/s, based on 5.5m/s. Also, the equivalent stress and displacement in the SUV car increased by about 119% and 378%, respectively.



압축착화기관에서 바이오디젤의 적용 가능성 연구

이상근, 최승훈

한국기계기술학회 한국기계기술학회지 제20권 제4호 2018.08 pp.473-478

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In this study, the applicability of biodiesel fuel was investigated as an hopeful alternative fuel for a compression ignition engine. The exhausted smoke emission of biodiesel fuel was reduced remarkably in comparison with commercial diesel fuel, that is, it was reduced approximately 64% at 2500 rpm, full load condition. And, torque, power and brake specific energy consumption rate did not showed significant differences. But, NOx emission of biodiesel fuel was slightly increased in comparison with the commercial diesel fuel. Generation of CO2 is considerably reduced by photosynthetic action in the course of growing biomass series plants, the material for biodiesel fuel.



리드용 와이어 압연 시 장력이 와이어 단면 형상 변형에 미치는 영향 분석

김세종, 김진호

한국기계기술학회 한국기계기술학회지 제20권 제4호 2018.08 pp.479-484

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In this paper, we investigated the change of sectional shape according to the tension when the reed wire was rolled. When rolling is performed, the tension acting on the reed wire acts in the opposite direction of the rolling progress and prevents twisting or bending phenomenon. The shape of the cross section was changed according to the tension acting on the reed wire, and the reed wire was rolled by continuously rolling the flat rolled wire and the tension was applied to the reed wire to control the simulation. As a result of the experiment, it was confirmed that the dimensions of the thickness and width after rolling can be adjusted through the tension acting on the lead wire. It was also confirmed that as the tension increased, the length of the lead wire increased and the residual stress increased.



레이저 기반 진단기술을 이용한 내연기관의 유동장 분석


한국기계기술학회 한국기계기술학회지 제20권 제4호 2018.08 pp.485-491

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Fluid motion within the internal combustion engine cylinder plays a major role in controlling the fuel/air mixing and combustion processes in spark-ignition engines, and the combustion processes in compressionignition engines. In-cylinder flow is quite unstable and varies from one cycle to another. Various methods of in-cylinder flow measurement and fuel/air mixing characterization have been developed during the past few decades. In particular, laser based flow diagnostic techniques have been utilized for this purpose. This study will focus on the quantification of spark-ignition engine in-cylinder flow using the laser based flow diagnostic techniques. The measurement methods, including high speed flow visualization and laser Doppler velocimetry (LDV), will be discussed.



Proposal of Design Method of Light-Entering Face of LED Backlight to Improve Luminance Distribution

Myung-Hyun Cho, Ho-Young Lee

한국기계기술학회 한국기계기술학회지 제20권 제4호 2018.08 pp.492-496

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In this study, We studied design method to reduce scattering reflection by adding a three - dimensional structure to light guide plate of LED backlight widely used in small and portable devices. In order to improve the efficiency of the light-incident part, a three-dimensional structure is used in which a repetitive structure of a prism shape and a semi-cylindrical shape is repeatedly added to the light-entering face in light-guide plate. As a result of the study, it was found that uniform luminance values were obtained in the light-incident portion and the backlight when a repetitive pattern of a semi-cylindrical shape was added as compared with a case in which a prism shape was added. Particularly, when a rectangular lens with a semi-cylindrical shape is added, the average value of the total luminance is increased by about 15% from 7278 lm to 8324 lm as compared with a general light guide plate.



불확정성을 고려한 두 개 실린더의 억지 끼워 맞춤에 대한 틈새 최적설계


한국기계기술학회 한국기계기술학회지 제20권 제4호 2018.08 pp.497-501

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An interference fit is a fastening between two parts which is achieved by friction after the parts are pushed together, rather than by any other means of fastening. A fit is depending on which part has its size controlled to determine the fit. To select an amount of interference see KS standard tables for class from light to heavy drive fits. The aim of this paper is to find the optimal gap under the interference fit with lowest contact pressure to the two cylinders. To accurately determine the amount of interference clearance, must consider the fluctuation of the response parameters such as contact pressure, displacements and stresses. The response of the cylinder system is modelled with the probabilistic finite element method using the Monte Carlo simulation. The probabilistic design is carried out using ANSYS probabilistic design software. And then the optimal design of the interference gap is sequentially solved to find the solution. The practical optimal design is proposed for the design of the interference fit system. The numerical results are obtained where the displacements and stresses treated as constraints.



다양한 형상의 패시브 마이크로 믹서의 혼합 성능 연구


한국기계기술학회 한국기계기술학회지 제20권 제4호 2018.08 pp.502-507

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A micromixer is a component of a lab-on-a-chip or microfluidic device that mixes two or more chemicals together. The purpose of this study is to assess the performance of passive micromixer of various shapes. Six shapes of micromixers compared mixing performance. Three dimensional modeling was carried out to have the same hydraulic diameter. The commercial code, ANSYS Fluent, was used to simulate the internal mixing flow. A numerical analysis method is described in detail in this paper. The performance of the micromixer was compared with the mixing index and pressure drop. Consequently, the CDM-8T shape showed reasonable mixing performance and relatively low pressure drop.




특허정보를 활용한 수소연료 전기차 주요 출원인의 기술경쟁력 분석

이창환, 이수진, 김치균

한국기계기술학회 한국기계기술학회지 제20권 제4호 2018.08 pp.508-515

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Since the so-called diesel gates of German automobiles, interest in environmentally-friendly vehicles has been rising, among other alternatives, hydrogen-fueled electric vehicles with 0% vehicle emissions are expected to replace a significant portion of passenger cars. Here, we analyze trends of US, Europe, PCT (WO) 3-patent offices application of hydrogen-fueled electric vehicles and analyze the patent application trends of national and individual companies, the patent application trend of detailed technology through clustering analysis, technology competitiveness. The global market for hydrogen-fueled electric vehicles, which is currently only 0.01% of other alternatives, is expected to grow to several percent in 2020. Major automobile makers such as Japan, United States of America, Germany, and Korea continue to fiercely compete for eco-friendly vehicles.



트리즈 기법을 이용한 탈부착 가능 잉크 카트리지 반영구 화장기기 개발

이창열, 김봉환, 박용택

한국기계기술학회 한국기계기술학회지 제20권 제4호 2018.08 pp.516-521

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In this study, the TRIZ methods were used to solve the main cause of the ink splashing phenomenon in a tattoo machine. To solve the ink splashing phenomenon that occurs when a tattoo machine is operated, a flow analysis of the needle unit was performed using ANSYS CFX V14.5. From the flow analysis result, it was confirmed that the ink splashing phenomenon of the tattoo machine can be supplemented by the hole leading to the outside to the needle unit of a tattoo machine. In order to diagnose the natural frequencies of the tattoo machine and the resonance phenomenon caused by the excitation of the motor, the natural frequency analysis was performed using the Abaqus/standard frequency analysis technique. From the results of the natural vibration analysis, it was confirmed that no resonance occurred. It is expected that it will contribute to improve the efficiency of the semi permanent cosmetic device with removable ink cartridge.



오크통 드럼 형상을 갖는 고효율 커피 로스터기 개발

이태연, 신준

한국기계기술학회 한국기계기술학회지 제20권 제4호 2018.08 pp.522-527

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In this study, high thermal efficiency and eco-friendly coffee roaster is developed. The core element of coffee roaster is a roasting drum and most of the coffee roasting drum is a flat cylindrical barrel type. From the traditional shape of cereal puffing machine, we got the idea of the roasting drum. Oak barrel shape is well known high thermal efficiency system in korean heating cook system. Therefore, we designed the coffee roaster containing the oak barrel shaped drum and combustor nozzles which has an ability of roasting 3kg of coffee beans within 10 minutes of roasting time. With our developed coffee roasting machine, the heating speed of roasting process is very fast, and the roasting of coffee beans can be quickly finished. We experimented the roasting time and compared the results with other coffee roasting machines of the same amount of roasting capacity. The results were outstanding in roasting time and the quality of roasting. In spite of smaller fuel consumption, the roasting time was more shorter than flat cylindrical roasting drum.



연마재 작업조건에 따른 폴리우레탄 재질의 마모량 예측에 관한 연구

장영재, 이찬주, 강성욱

한국기계기술학회 한국기계기술학회지 제20권 제4호 2018.08 pp.528-534

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In this study, the amount of abrasive wear was predicted effectively by FE simulation and experiment regarding the material and shape of the abrasive. In order to calculate numerically the amount of wear using the Archard wear equation, the normal load between the abrasive and the polyurethane was calculated by FE simulation. The sliding distance can be calculated according to the working conditions, and the hardness of the polyurethane is a known value. The wear coefficient K was calculated inversely by experimental measurement of the wear amount according to the working conditions of the abrasive. In order to verify the proposed calculation method, the wear amount was calculated by using the Archard wear equation by applying the calculated wear coefficient K with regard to arbitrary working conditions. The deviation between the proposed calculation results and the experimental results was within 10%. When the wear coefficient K is calculated by using the proposed method, the wear amount can be estimated. In addition, it was found that the change of the vertical load value concerning penetration depth was the main factor for determining wear amount.



플라즈마 멸균기용 진공 챔버의 설계 및 평가

신준, 이태연

한국기계기술학회 한국기계기술학회지 제20권 제4호 2018.08 pp.535-540

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It is essential for medical equipment sterilization operations to prevent infections in the hospital. The low temperature plasma sterilization method using oxygenated water has the advantage of high efficiency and short time in sterilizing processes. However, a chamber which can hold constant vacuum condition without deformation is essential in the sterilizing system to apply plasma sterilization technique. In this study, therefore, the vacuum chamber is developed for 70 liter plasma sterilization device. The vacuum chamber is designed by checking the thickness, edge fillet value and rib of chamber through each simulation. And the performance of the chamber is investigated by vibrational modes and heat stress simulation. The prototype vacuum chamber is tested by experiments to verify the safety and efficiency for 0.1 Torr vacuum, and the result shows the expected vacuum level and displacement.



배관 내부검사를 위한 구동장치가 있는 영상검사장비 개발


한국기계기술학회 한국기계기술학회지 제20권 제4호 2018.08 pp.541-547

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The visual inspection device was developed for non-destructive test of piping from the inside. The developed components of the system can be classified as camera module, main body module named crawler module and system module. Because the system has driving part as electric motors, it can run not only the horizontal and vertical straight lines but also bend lines. The system has video processors, it can make it possible to display the video on the monitor and to save the video clips simultaneously. Several tests were performed to check the development objectives.



Instructions to Authors 외


한국기계기술학회 한국기계기술학회지 제20권 제4호 2018.08 pp.549-561

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