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 제6호 (33건)



백연 저감을 위한 열교환 시스템의 배기 열전달 특성에 관한 연구

왕 쩐 후안, 전종균, 권영철

한국기계기술학회 한국기계기술학회지 제20권 제6호 2018.12 pp.739-744

※ 기관로그인 시 무료 이용이 가능합니다.

In this study, effects of reducing white smoke at a heat exchange system for white smoke reduction were studied in the winter season. For this purpose, the heat transfer processes on the exhaust air were investigated by Solidworks. Five wave heat exchangers of air-to-air and air-to-water type were applied for the exhaust air heat recovery. The analytical condition of the exhaust air was fixed and the computational analysis was performed according to the change of SA(supply air) inlet velocities. In order to evaluate the performance of the heat exchange system for white smoke reduction, W(water)/SA recovered capacities and the temperature/ absolute humidity reduction rate were calculated. As SA inlet velocity increased, the exit temperature and absolute humidity of the mixing zone were reduced by up to about 40℃ and 0.12kg/kg respectively. Also, W/SA recovered capacities increased linearly up to about 35%.



용탕조건에 따른 상용 차량용 어댑터 하우징의 열적특성에 관한 연구

고동국, 명순식, 강병용, 김민수

한국기계기술학회 한국기계기술학회지 제20권 제6호 2018.12 pp.745-750

※ 기관로그인 시 무료 이용이 가능합니다.

In this study, the thermal behavior of adaptor housing was analyzed by the numerical method. The boundary conditions used to die casting process were the temperature of molten metal and injection time. As the temperature of the molten metal increased, the tensile strength of the product decreased by the blow hole generated in the molten metal, and the decreasing tendency was gradually decreased. As the injection time of the molten metal increased, the heat flux rose, but the degree of the increase was very small. So, the injection time of the molten metal had little effect on the thermal behavior and diffusion of the adapter housing. As a result, the heat of the molten metal was transferred into the housing and the thermal behavior spread widely.



HEEDS를 이용한 전기자동차에서의 모터 축 최적설계에 관한 연구

김봉환, 정영재, 이창열, 이병호

한국기계기술학회 한국기계기술학회지 제20권 제6호 2018.12 pp.751-756

※ 기관로그인 시 무료 이용이 가능합니다.

A study on the weight reduction of a motor shaft in electric vehicle by using optimum design technique was carried out. The structural analysis of a motor shaft was performed by using ANSYS to investigate the structural safety. We also used HEEDS to find the optimal hollow shaft thickness. When the material of the hollow shaft is changed to SCM822H by using ANSYS 14.5 and HEEDS MDO, the weight could be reduced by about 53 % compared to the conventional solid one. From this study, the optimized dimensions of a hollow shaft were determined for light weight design.



LDV를 이용한 토크컨버터 내 유동의 실험적 분석


한국기계기술학회 한국기계기술학회지 제20권 제6호 2018.12 pp.757-762

※ 기관로그인 시 무료 이용이 가능합니다.

LDV(laser Doppler velocimetry) measurements were conducted on the exit region of the impeller passage and the gap between the impeller and turbine blades under 0.8 speed ratio. The 0.8 speed ratio has an impeller speed of 2000rpm and a turbine speed of 1600rpm. A periodic variation of the mass flow rate is present in many of the measurements made. The frequency of this variation is the same as the frequency of the turbine blades passing the impeller passage exit. It is found that the instantaneous position of the turbine had effect on fluid flow inside the impeller passage and gap region. This study would aid in the construction of higher accuracy CFD models of this complex turbomachinery device.



다겹보온커튼의 조합에 따른 열성능의 비교 분석

진병옥, 김형권, 유영선, 이태석, 김영화, 오성식, 문종필, 강금춘

한국기계기술학회 한국기계기술학회지 제20권 제6호 2018.12 pp.763-769

※ 기관로그인 시 무료 이용이 가능합니다.

In this research, in order to improve the heat retention of greenhouse, comparative analysis of the heat flux of the marketed multi-later insulating curtain was carried out. Experiments is conducted by fabricating a test apparatus for investigating the heat flux characteristics. The multi-later insulating curtain used for the experiment was compared using the P, N, S, U and T company, which are commercially available, and the heat flux due to temperature difference between the experimental apparatus and the outside was compared and analyzed. When the internal temperature of the experimental result is the maximum temperature 60℃, the heat flux of multi-later insulating curtain is T Co.(73.1W/m2) > S Co.(119.5W/m2) > U Co.(155W/m2) > N Co.(163.1 W/m2) > P Co.(177.7W/m2). The heat flux means the quantity of heat passing through the unit time per unit area, and the higher the numerical value, the higher the quantity of heat passing through the multi-layer insulating curtain. This can be determined that high heat fluxes produce low heat resistance. Further, it has been found that the weight of the insulating curtain is largely unrelated to the heat insulating property, and the heat insulating curtain having a thickness containing a high internal air layer is excellent in the heat insulating property. In the future when manufacturing a heat insulating curtain, It is judged that it is desirable to manufacture a combination of heat insulating materials that contain a high internal air layer content and that can maintain the air layer even for long-term use while minimizing the volume.



모의 생체조직의 표면온도 조건에 따른 근육이완 특성에 관한 연구

고동국, 이찬우, 김민수

한국기계기술학회 한국기계기술학회지 제20권 제6호 2018.12 pp.770-775

※ 기관로그인 시 무료 이용이 가능합니다.

In this study, the characteristics of muscle relaxation were analyzed by the experimental and numerical method. A skin tissue was produced by imitational biological tissue using the agar powder, saline solution and sugar. The tissue was exposed to three types of wavelength-blue visible radiation(410 nm), red visible radiation(635 nm), and infrared ray(830 nm). The temperature results along the depth of tissue were measured according to the variation of light wavelength and irradiation time. The temperature change of the tissue shown up similar pattern regardless of the light wavelength kinds. The wavelength of infrared ray penetrated strongly into tissue between 3.2 mm and 11.4 mm. Also, the temperature change with the irradiation time was small, and the temperature value of the infrared ray was the largest. As a result, the muscle relaxation will occur mainly at the infrared wavelength.



MLP 층을 갖는 CNN의 설계

박진현, 황광복, 최영규

한국기계기술학회 한국기계기술학회지 제20권 제6호 2018.12 pp.776-782

※ 기관로그인 시 무료 이용이 가능합니다.

After CNN basic structure was introduced by LeCun in 1989, there has not been a major structure change except for more deep network until recently. The deep network enhances the expression power due to improve the abstraction ability of the network, and can learn complex problems by increasing non linearity. However, the learning of a deep network means that it has vanishing gradient or longer learning time. In this study, we proposes a CNN structure with MLP layer. The proposed CNNs are superior to the general CNN in their classification performance. It is confirmed that classification accuracy is high due to include MLP layer which improves non linearity by experiment. In order to increase the performance without making a deep network, it is confirmed that the performance is improved by increasing the non linearity of the network.



CRDI 디젤엔진의 피에조 인젝터 불량에 따른 파형 분석에 관한 실험적 연구

유종식, 김철수

한국기계기술학회 한국기계기술학회지 제20권 제6호 2018.12 pp.783-789

※ 기관로그인 시 무료 이용이 가능합니다.

This paper investigates the relationship of voltage and current waveform between normal piezo injector and deterioration abnormal piezo injector. The experimental methods using Pico oscilloscope and GDS scan tool are employed to measure current and voltage waveform and fuel pressure of piezo injector. The experiment is carried out during no-load condition. A summary of the important results are as follows. 1) In case of normal injector, the fluctuation of duration time of piezo injector was linearly and regularly decreased with increasing engine speed, but the that of deterioration piezo injector was irregularly decreased with increasing engine speed. 2) In main injection, the peak value of the current waveform of abnormal injector was larger than that of normal injector, the duration time of deteriorated abnormal injector was less than that of normal injector at 800rpm and 1500rpm, but the duration time of deteriorated abnormal injector was larger than that of normal injector at 2000rpm and 3000rpm. This irregularity appears to be caused by the deterioration of the injector.



하중 보상을 이용한 회전 구동부의 처짐 특성 연구


한국기계기술학회 한국기계기술학회지 제20권 제6호 2018.12 pp.790-795

※ 기관로그인 시 무료 이용이 가능합니다.

In this study, we analyzed the structural safety and vibration characteristics of rotational drive in 3D CT scan equipment using finite element analysis. The analysis results showed a safety factor of 9.2 and a left and right vertical deflectional deviation of 0.24mm from the maximum equivalent stress. After applying weight compensation of 27.7kgf, the structural analysis reduced the safety factor to 7.6, but the deflectional deviation of the left and right structure was reduced to 0mm. Also, we presented the optimum design of rotational drive through the vibration analysis.



SUS 육각봉 인발성형 시스템의 클램프 가이드 바에 관한 구조해석

이영식, 양영준

한국기계기술학회 한국기계기술학회지 제20권 제6호 2018.12 pp.796-802

※ 기관로그인 시 무료 이용이 가능합니다.

In order to remove rust and impurities from surface of raw SUS circular bar, peeling machine is used to make lustrous and clean surface of SUS circular bar. Drawing process system is used to manufacture SUS hexagonal bar. SUS hexagonal bar have been widely used to make hexagonal bolt/nut, adapter and fittings and so on. The purpose of this study is to investigate the stabilities for guide bar of clamp in drawing process system. As the results, the guide bar showed structural stability in cases of below load of 50 Ton and over hook radius of 3.0mm. Further as the thickness of guide bar hooking with jaw was increased, minimum safety factor was decreased.



컴퓨터응용설계(CAD)를 이용한 기어모델링 자동화 모듈 개발


한국기계기술학회 한국기계기술학회지 제20권 제6호 2018.12 pp.803-808

※ 기관로그인 시 무료 이용이 가능합니다.

Combining digital automation solutions throughout recent manufacturing process is essential. Advanced robot and mechanical techniques are required for design, manufacture, and distribution process. Manual design of repetitive similar mechanical components during the development phase of these advanced machines and robots can occur wasting time and money. Developed gear design module, which is the power transfer system mechanical component, was programmed in the Visual Basic language in CATIA V5 environment. Automation Process is Based on Parametric Modeling Method. and it was found to be effective in reducing design time compared to designers manual modeling.



속도 및 가속도 제한조건을 갖는 모델예측제어기 설계

박진현, 최영규

한국기계기술학회 한국기계기술학회지 제20권 제6호 2018.12 pp.809-817

※ 기관로그인 시 무료 이용이 가능합니다.

The model predictive controller performance of the mobile robot is set to an arbitrary value because it is difficult to select an accurate value with respect to the controller parameter. The general model predictive control uses a quadratic cost function to minimize the difference between the reference tracking error and the predicted trajectory error of the actual robot. In this study, we construct a predictive controller by transforming it into a quadratic programming problem considering velocity and acceleration constraints. The control parameters of the predictive controller, which determines the control performance of the mobile robot, are used a simple weighting matrix Q, R without the reference model matrix Ar by applying a quadratic cost function from which the reference tracking error vector is removed. Therefore, we designed the predictive controller 1 and 2 of the mobile robot considering the constraints, and optimized the controller parameters of the predictive controller using a genetic algorithm with excellent optimization capability.



안정화 열처리에 의한 Al-4.8Zn-1.3Mg계 합금 압출재 특성 평가


한국기계기술학회 한국기계기술학회지 제20권 제6호 2018.12 pp.818-823

※ 기관로그인 시 무료 이용이 가능합니다.

In this study, the effect of pre-aging treatment for inhibition of natural aging of Al-4.8Zn-1.3Mg alloy by extrusion process was investigated. Firstly, the as-cast microstructure of Al-4.8Zn-1.3Mg alloy billet and its evolution during homogenization(460℃, 4h + 510℃, 5h) were investigated by means of optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), hardness analysis. The as-cast microstructures of Al-4.8Zn-1.3Mg alloy reveal Mg2Zn, Al5Cu, Al3Cu formed between dendrities. After homogenization, MgZn, Al4Cu, Al13Cu phases precipitated into the matrix. In addition, standard deviation of homogenized billet was improved than as-cast billet from 2.62 to 0.99. According to pre-aging(100℃, 1h) Al-4.8Zn-1.3Mg alloy by extrusion process, yield strength and tensile strength deviation improved more than condition by natural aging.



CAD 시스템에서의 설계 자동화기법을 활용한 금형 설계 효율화 방안 연구


한국기계기술학회 한국기계기술학회지 제20권 제6호 2018.12 pp.824-829

※ 기관로그인 시 무료 이용이 가능합니다.

Molding is the root industry of the manufacturing as a means to mass-produce developed prototypes. Molds are typically divided into injection molds and press mold industries. Injection molds produce the products by injection of molten plastic into a mold, and press molds are molded and bended plate. The ejection system, such as eject pins, is used to separate the manufactured products from the mold, which involves a number of hole operations. Location, diameter and depth of holes are often tabulated and managed collectively when designing 2D drawings. The design efficiency was realized by applying CATIA Automation to the 3D model and bringing in the data of the holes in the Excel data.



슬러지 이송용 튜브형 링크체인 컨베이어의 최적설계

김봉환, 정영재, 이창열

한국기계기술학회 한국기계기술학회지 제20권 제6호 2018.12 pp.830-835

※ 기관로그인 시 무료 이용이 가능합니다.

The tubular link chain conveyor works under very extreme conditions such as high tensile load, friction, and dangerous operating environments. In this study, we propose an optimal design plan for reducing cost and improving performance through weight reduction of tubular link chain conveyors for sludge transport. For light weight of tubular link chain conveyor, the optimization software using SHERPA algorithms, HEEDS was used in conjunction with ANSYS Mechanical V14.5, which is widely used in structural analysis, to achieve optimal tubular link chain. Through the optimization process, 19% light weight was achieved.



120밀리 자주박격포 사격 충격에 따른 마운트 구조 안정성 분석


한국기계기술학회 한국기계기술학회지 제20권 제6호 2018.12 pp.836-843

※ 기관로그인 시 무료 이용이 가능합니다.

In this paper, dynamic model of 120mm self-propelled mortar is developed, and multi flexible body dynamics analysis is performed to analyze stresses occurring in the mount during mortar fire. For this, vehicle dynamic system, mortar dynamic system, and finite element mount model are proposed. The commercial program Recurdyn is used in the analysis. As a result of the analysis, the maximum stress(146.9MPa) occurred at the mount side plate. In order to analyze the validity of the analysis results, we performed strain measurement tests by selecting three major points, and the errors of results were 7.91%, 11.15%, and 18.23%, respectively. It is confirmed that the tendency of analysis and test is similar.



이산요소해석에 기초한 블레이드 형상에 따른 숏볼의 투사속도 예측

김태형, 이승호, 정찬기

한국기계기술학회 한국기계기술학회지 제20권 제6호 2018.12 pp.844-851

※ 기관로그인 시 무료 이용이 가능합니다.

In this study, the regression equation was suggested to predict of the shot ball velocity according to blade shapes based on discrete element (DE) analysis. First, the flat type blade DE model was used in the analysis, the validity of the DE model was verified by giving that the velocity of the shot ball almost equal to the theoretical one. Next, the DE analyses for curved and combined blade models was accomplished, and their analytical velocities of shot ball were compared with the theoretical one. The velocity of combined blade model was greatest. From this, the regression equation for velocity of shot ball according to the blade shape based on the DE analysis was derived. Additionally, the wind speed measurement experiment was carried out, and the experimental result and analytical one were the same. Ultimately, it was confirmed that the prediction method of the velocity of shot ball based on DE analysis was effective.



사각채널에서 사다리꼴 와류발생기에 의한 열전달 촉진에 대한 수치해석

박태환, 이수룡

한국기계기술학회 한국기계기술학회지 제20권 제6호 2018.12 pp.852-857

※ 기관로그인 시 무료 이용이 가능합니다.

Vortex Generators are used in heat exchanger to enhance the heat transfer of air side. 3-D numerical analysis is performed on heat transfer characteristics of a channel with trapezoidal vortex generator. We investigate the effects of vortex generators with two different inclined angles to flow direction which are forward and backward vortex generators. The thermal hydraulic performance such as Nu and pressure drop, is compared quantitatively. The results show that vortex generator enhances the heat transfer by developing boundary layers and secondary flow in the downstream. The downwash flow region corresponds to the maximum Nu, while the upwash flow region corresponds to Nu minimum. In the view of the heat transfer characteristics, FVG is better than BVG. However, when flow is turbulent as Re increases, the pressure drop for FVG is higher than that for BVG.



산화 그래핀 맴브레인의 물투과 속도와 차압 조건 간 상관관계에 대한 실험적 연구


한국기계기술학회 한국기계기술학회지 제20권 제6호 2018.12 pp.858-864

※ 기관로그인 시 무료 이용이 가능합니다.

Graphene oxide (GO) laminate is a new promising material for water purification system, which has extraordinary permeability only for water molecule. It consists of numerous nano-channels, in which water molecules could be nano-confined, resulting in slip of the molecules for very fast transportation speed. In this study, water penetration rate via different thickness of GO membrane according to driven pressures are measured experimentally, so that speed of water molecules and permeability are evaluated. Generally, water penetration rate via a membrane with macroscopic-sized channel increases linearly with pressure difference between up and bottom side of the membrane, but that via GO membrane approaches asymptotic value (i.e. saturation) as like a log function. Moreover, the permeability of GO membrane was observed in inverse proportion to its thickness. Based on the experimental observations, a correlation for volume flux via GO membrane was suggested with respect to its thickness and external pressure difference.



3-way 초고압 밸브의 유로제어를 위한 니플 파단 특성에 관한 연구

강대희, S. Ranjit, 정윤재, 김원태

한국기계기술학회 한국기계기술학회지 제20권 제6호 2018.12 pp.865-871

※ 기관로그인 시 무료 이용이 가능합니다.

The 3-way valve have been used as a valve for opening and closing the valve by the flow control in the pressure system of the cryogenic and high pressure environment. In this paper, numerical analysis and experimental study on fracture nipple of 3-way ultra high pressure valve applied to space launch vehicle was carried out. We have developed a 3-way valve numerical simulation modeler of cryogenic environment using commercial software ANSYS 18.2. As results of numerical analysis, optimum nipple condition was derived. In addition, a 3-way valve prototype was fabricated and the fracture test was performed and compared with the numerical analysis results.



증기표의 과열, 포화 및 압축영역의 신경회로망 모델링

이태환, 박진현

한국기계기술학회 한국기계기술학회지 제20권 제6호 2018.12 pp.872-878

※ 기관로그인 시 무료 이용이 가능합니다.

Steam tables including superheated, saturated and compressed region were simultaneously modeled using the neural networks. Pressure and temperature were used as two inputs for superheated and compressed region. On the other hand Pressure and dryness fraction were two inputs for saturated region. The outputs were specific volume, specific enthalpy and specific entropy. The neural network model were compared with the linear interpolation model in terms of the percentage relative errors. The criterion of judgement was selected with the percentage relative error of 1%. In conclusion the neural networks showed better results than the interpolation method for all data of superheated and compressed regio



개인 방탄·방검복 시스템 체계개발 선행연구

김훈, 황태선, 허영택, 이창배

한국기계기술학회 한국기계기술학회지 제20권 제6호 2018.12 pp.879-885

※ 기관로그인 시 무료 이용이 가능합니다.

Precedent research and development of personal armor and anti-stab wearing system has been conducted since 2018 as a part of the government-affiliated cooperative development project to create the best utilization of present technology and achievement according to the civil and military technical cooperation project promotion law. At present, the armor system operated by the ROK(Republic of Korea) military, the police, and the marine police is utilizing only basic armor using armor vests and plates. Therefore it is necessary to develop the personal armor and anti-stab wearing system which is suitable for various tasks in army with maximum protection capability. In this paper, we analyzed the study about international technologies, market trends of the developed countries and scope of research, utilization plan, R&D results for the best armor and anti-stab wearing system development.



A6451 알루미늄 및 용융아연도금강판의 클린칭 접합특성 및 접합기술의 차체 부품 적용 연구

권의표, 박현경

한국기계기술학회 한국기계기술학회지 제20권 제6호 2018.12 pp.886-893

※ 기관로그인 시 무료 이용이 가능합니다.

In this study, clinching characteristics of aluminum and galvanized steels were investigated for the application of clinching as a joining technique to aluminum wheelhouse assembly. A6451 aluminium alloy and galvanized steel sheets were joined by hybrid joining(clinching + adhesive bonding). Tensile-shear load and fracture mode of hybrid joints were investigated. Maximum tensile-shear load of hybrid joints was about six times higher than that of clinched joints without adhesive. Energy absorption values of hybrid joints were higher than those of clinched joints without adhesive as well as resistance spot welded steel joints. Developed aluminum wheelhouse assembly showed higher static stiffness than the existing steel parts. Aluminum wheelhouse inner panel unit was 44% lighter than the steel unit, and the final assembled aluminum wheelhouse was 14.6% lighter than the existing steel parts.



연약지반 개량 PBD 복합천공기 리더의 구조 안전성 평가


한국기계기술학회 한국기계기술학회지 제20권 제6호 2018.12 pp.894-900

※ 기관로그인 시 무료 이용이 가능합니다.

Among the soft ground improvement methods, PBD is the most common construction method because it is cheap and construction is fast. However, if the ground is rigid, additional work is required. In this study, the structural safety, natural vibration, and safety angle of the steel vertical tower structure were evaluated in the development of the PBD composite perforator which can be combined with drilling work and PBD construction. Structural safety was assessed when the wind load of 20 m/s was simultaneously applied to the PBD construction load of 20 tons, the perforating operation of 25 tons, and the wind speed of 50 m/s was applied only to the wind load. The natural frequencies were evaluated up to the sixth mode, and the safety angle was evaluated for static and dynamic safety angles.




양형 튜블러 샤프트 요크 적용 가변 슬라이딩 중간축 모듈의 토크 변경에 따른 응력 분포 특성

염진섭, 서현규

한국기계기술학회 한국기계기술학회지 제20권 제6호 2018.12 pp.901-905

※ 기관로그인 시 무료 이용이 가능합니다.

The objective of this study is to investigate the effect of torque variation on stress distributions in A-IMS module with both side tubular shaft yoke by numerically. In order to achieve this, the torque value was increased from 10Nm to 40Nm, and the results of this work were confirmed in terms of Von-mises Stress and the displacement characteristics. As the torque in module assembly was increased, the stress in tubular shaft york and splined shaft york was increased linearly. The indentation due to the steel ball was occurred in over 40N·m torque which is over the yield strength condition. The largest displacement occurred in the tubular shaft yoke 1, however, it does not exceed the yield strength and is supposed to be restored due to the elasticity. Therefore, it was concluded that there is no problem for the manufacturing of A-IMS with both side tubular shaft yoke.



레인지후드 역류 저감 시스템 개발


한국기계기술학회 한국기계기술학회지 제20권 제6호 2018.12 pp.906-911

※ 기관로그인 시 무료 이용이 가능합니다.

This study was conducted to develop an efficient high performance range hood and exhaust system for quickly discharging flue gas, smoke, and odor generated when food is cooked in the kitchen, and the following results were obtained. Reverse current rate of 1.53 m/s of the range exhaust system was improved to achieve the inlet speed of 0.3 m/s or less. An efficient range system was constructed by improving the hood exhaust flow by 5.6 m/s at the existing 4.5 m/s.



4절 링크를 활용한 소형 6족 보행 로봇

차은엽, 정광필

한국기계기술학회 한국기계기술학회지 제20권 제6호 2018.12 pp.912-916

※ 기관로그인 시 무료 이용이 가능합니다.

Crawling robots are advantageous in overcoming obstacles. These robots have characteristics such as light weight and outstanding mobility. In case of large robots, they have difficulties passing narrow gaps or entering the cave. In this paper, we propose a milli-scale hexapedal robot using 4-bar linkages. Two conditions are necessary to enable efficient walking. In short, the trajectory of the foot must be elliptical, and the lowest point of the foot should be the same. These conditions are satisfied with a novel leg design. The robot has a pair of three legs and the legs are coupled to operate simultaneously. Each set of the legs are installed to robot’s both sides and the legs satisfy the equal lowest foot point and elliptical trajectory. As a result, this hexapedal robot can crawl with 0.56m/s speed.



산란계에 적용 가능한 공기-물 히트펌프의 음용수 공급시스템 이용기술에 관한 연구

백이, 강석원, 장재경, 권진경

한국기계기술학회 한국기계기술학회지 제20권 제6호 2018.12 pp.917-923

※ 기관로그인 시 무료 이용이 가능합니다.

The drinking water supply system applicable to the laying hen consists of air-water heat pumps, drinking water tanks, heat stroage tank, circulation pumps, PE pipes, nipples, and control panels. When the heat pump system has power of 7.7 to 8.7 kW per hour, the performance coefficient is between 3.1 and 3.5. The supply temperature from the heat pump to the heat stroage tank was stabilized at about 12±1°C, but the return temperature showed a variation of from 8 to 14°C. Stratified temperature in the storage tank appeared at 12.°C, 13.5°C and 14.4°C, respectively. The drinking water supply temperature remained set at 15°C and 25°C, and the conventional tap water showed a variation for 23°C to 30°C. As chickens grow older, the amount of food intake and drinking water increased. y = -0.0563x2 + 4.7383x + 8.743, R2 = 0.98 and the feed intake showed y = -0.1013x2 + 8.5611x. In the future, further studies will need to figure out the cooling effect on heat stress of livestock.



양형 IMS 모듈 튜블러 샤프트의 스플라인 가공 개선

민세훈, 서현규

한국기계기술학회 한국기계기술학회지 제20권 제6호 2018.12 pp.924-928

※ 기관로그인 시 무료 이용이 가능합니다.

The objective of this study is to solve a problem that is occurred during the spline machining of tubular shaft yoke in both side IMS module. In order to simulate the problem, the movement direction of upper die was set as standard case and error case. The material of tubular shaft yoke was set to S20C as refer to the analysis library. The movement directions of upper die were separated with standard case and error case. The error case was set to simulate the problem in the spline machining of tubular shaft yoke. In order to solve the problem, the outer radius of upper die were modelled from 9.40mm to 9.44mm. The simulation results were analyzed and compared in terms of effective stress, metal flow line and folding phenomena characteristics. In case of the outer radius of upper die was 9.42mm, it was observed a relatively uniform effective stress distribution and had a straight metal flow line.



터널 굴착기 유압시스템용 유량 제어 블록 개발

이재동, 임상진

한국기계기술학회 한국기계기술학회지 제20권 제6호 2018.12 pp.929-935

※ 기관로그인 시 무료 이용이 가능합니다.

This paper develops a flow control block for a hydraulic system of a tunnel boring machine. The flow control block is a necessary component to ensure stability in the operation of the hydraulic system. In order to know the pressure distribution of the flow control block, the flow analysis was performed using the ANSYS-CFX. It was confirmed that the pressure and flow rate were normally supplied to the hydraulic system even if one of the four ports of the flow control block was not operated. In order to evaluate the structural stability of the flow control block, structural analysis was performed using the ANSYS WORKBENCH. As a result, the safety factor of the flow control block is 1.54 and the structural stability is secured.


1 2
페이지 저장