• 한국산학기술학회논문지
• /
• 제19권2호
• /
• pp.644-652
• /
• 2018

본 논문은 제품 교체 주기가 비교적 짧고 정기적인 IT 제품의 조립 공정 맞춤형 그리퍼 개념 설계에 관한 내용을 담고 있다. 제조 현장에서 쓰이는 그리퍼는 대부분 1~2 자유도로 간단하게 구성되고 한 번에 다양한 물체가 아닌 정해진 것만 다룬다. 또한 가격이 중요한 비중을 차지한다. 만약 공정에 적합한 그리퍼를 빠르고 쉽게 개발 할 수 있다면 제품 및 공정의 잦은 변경에 따른 자동화의 어려움을 일부 해소할 것으로 기대한다. 연구에 필요한 조립 공정은 재조사의 기밀인 관계로 공정 분석 진행 절차와 방법을 정의하고 기술하였다. 공리적 설계를 이용해 테블릿 PC 조립을 위한 그리퍼의 기능 요구와 설계 파라미터를 도출하였다. 이러한 파라미터를 결정함으로써 그리퍼의 개념 설계가 이루어질 수 있도록 설계 방법을 제안하였다. 타당성 검토를 위해 특정 공정을 선택하고 그리퍼 설계 진행 과정을 예재로 기술하였다. 그리퍼 설계 지침에 관한 연구가 있지만 고려 사항이 너무 일반적이고 아이디어 도출의 자유도가 높은 문제가 있다. 본 논문은 제품 및 자동화 시장이 활성화 된 IT 제품의 조립 공정을 바탕으로 그리퍼의 기능을 정의하였다. 이를 통해 물체를 잡는 것에 그치지 않고 조립 과정을 반영한 설계를 목표로 하였다.

• 로봇학회논문지
• /
• 제9권1호
• /
• pp.48-56
• /
• 2014

In robotic surgery, a surgeon checks only a surgical site of patient in the progress of surgery by vision and sound information. In order to solve this limited information, the haptic function is necessary. And haptic surgical robot is also necessary to design a haptic master device. The master device for laparoscope operation with cable-conduit was developed in previous research to give haptic function. It suggested a possibility of developing a master device by using the cable-conduit. However, it is very inconvenient to use. Therefore, this paper suggests a new mechanism design structure to solve the problems of the previous work by new forming a new master device. And it has proved that it's usability is better than previous one. Furthermore it has also experimented and analyzed that a backlash of new master device is compensated by smooth backlash inverse algorithm.

• 공학교육연구
• /
• 제7권2호
• /
• pp.40-50
• /
• 2004

최근 홍익대학교 기계 시스템디자인공학과에서는 급변하는 시대 조류에 부응하도록 교과목 체계를 검증하고, 신규 교과목, 교수-학습 방법 및 교과과정을 개발하며, 산업체에서 필요로 하는 기술 인력을 양성하기 위해 전문가, 졸업생 및 재학생을 대상으로 설문조사를 실시하였다. 본 연구에서는 이 설문조사에 근거하여 산업체 중역과 현장 실무자가 필요로 하는 인재를 양성하는 동시에 재학생들의 요구도 충족할 수 있는 신규 교과목과 교수-학습 방법을 개발하고 적합한 교과목 체계를 검증하고자 한다. 재학생, 졸업생 및 전문가를 대상으로 한 설문조사를 분석한 결과, 신규 교과목 및 교수-학습 방법은 다양한 실습 경험 기회를 제공하고 언어 소통 능력을 교육하며 첨단/연계분야에 적합한 학과목을 개설함으로써 산업체에서 요구하는 인재를 양성하고, 재학생에게는 동기를 부여할 수 있는 방향으로 개발되어야 할 것으로 나타났다.

• International Journal of Fluid Machinery and Systems
• /
• 제10권1호
• /
• pp.63-75
• /
• 2017

Many axial fans have circular arc blades with constant thickness. It is still a challenging task to calculate their performance, i.e. to predict how large their pressure rise and pressure losses are. For this task a need for cascade data exists. Therefore, the designer needs a method which works quickly for design purposes. In the present contribution a design method for such cascades consisting of circular arc blades with constant thickness is described. It is based on a singularity method which is combined with a CFD-data-based flow loss model. The flow loss model uses CFD-data to predict the total pressure losses. An interpolation method for the CFD-data are applied and described in detail. Data of measurements are used to validate the CFD-data and parameter variations are conducted. The parameter variations include the variation of the camber angle, pitch chord ratio and the Reynolds number. Additionally, flow patterns of two dimensional cascades consisting of circular arc blades with constant thickness are shown.

• 시스템엔지니어링학술지
• /
• 제4권2호
• /
• pp.1-13
• /
• 2008

The development of hull curved plate forming automation system in ship production field begins from the need of stakeholders such as enterprise organization, who need the reduction of cost and time and improvement of productivity, and end users who work for this production process. Even though hull curved plate forming automation system has small scale, it is reasonable to consider the system as an interdisciplinary system, because the system includes all of hardware, software, human and information and has a specified objective to be performed. In this paper, introduction of 4 leading Model-Based Systems Engineering (MBSE)methodologies is described and SysML(Systems Modeling Language), which is designed to analyze, specify, design, and verify complex systems, is introduced in order to support those methodologies. Especially, SysML is applied to system modeling of hull curved plate forming automation system and focused on. The structure diagrams and behavior diagrams based on operational context of the automation system are used to make system architecture. The performed application of SysML to the hull curved plate forming automation system shows an example of applying SysML to the development of other autonomous systems in ship production domain.

• 한국전기전자재료학회논문지
• /
• 제35권6호
• /
• pp.616-621
• /
• 2022

Numerical simulation is a good way to predict the conversion efficiency of solar cells without a direct experimentation and to achieve low cost and high efficiency through optimizing each step of solar cell fabrication. TOPCon industrial solar cells fabricated with n-type silicon wafers on a larger area have achieved a higher efficiency than p-type TOPCon solar cells. Electrical and optical losses of the front surface are the main factors limiting the efficiency of the solar cell. In this work, an optimization of boron-doped emitter surface and front electrodes through numerical simulation using "Griddler" is reported. Through the analysis of the results of simulation, it was confirmed that the emitter sheet resistance of 150 Ω/sq along the front electrodes having a finger width of 20 ㎛, and the number of finger lines ~130 for silicon wafer of M6 size is an optimized technology for the front emitter surface of the n-type TOPCon solar cells that can be developed.

• 대한의용생체공학회:의공학회지
• /
• 제32권1호
• /
• pp.32-36
• /
• 2011

The insufflators in endoscopic surgery supply carbon dioxide to make the air-filled cavity in the abdomen. It contains many kinds of pneumatic and electronic parts and they are connected with the air tubes and electrical wires. The printed circuit boards (PCB) perform wiring, holding and cooling tasks in electronic systems. In this study, the PCB is used as the air channel for insufflators to decrease the cost, volume, and the malfunction according to aging of the device. Three layers of PCB made of FR4 are combined with prepreg as adhesive which has the internal airway channel according to the design. By mounting the pressure sensors and valves, the PCB based fluidic system is implemented. After calibration of flow sensor, the flow rate of the gas also can be measured. The climate test, temperature test, and biocompatibility test showed this idea can be used in insufflators for laparoscopic surgery.

• 한국정밀공학회지
• /
• 제31권12호
• /
• pp.1127-1132
• /
• 2014

Fast tool servo (FTS) is an enabling technology to fabricate various shapes of functional surface geometries in a precise and controllable manner. FTS can be also employed as a straightforward and efficient surface treatment way of making such products more durable. In this work, process characteristics using high-precision FTS-based surface texturing were qualitatively and quantitatively investigated to provide a class of surface design rule. The morphologies of surfaces processed with different conditions were first examined by observing the resultant 2D/3D surface profiles. In addition, the effects of the surface treatment using FTS on hardness and wear properties were characterized and compared to those without treatment.

• 대한의용생체공학회:학술대회논문집
• /
• 대한의용생체공학회 1998년도 추계학술대회
• /
• pp.247-248
• /
• 1998

The effect of unattached valve leaflet on flow field downstream of a floating and flapping polyurethane heart valve prosthesis was investigated. With a triggering system and a time-delay circuit the instantaneous velocity field downstream of the valve was measured by particle image velocimetry (PIV) in conjunction with the opening posture of a flexible valve leaflet during a cardiac cycle. Reynolds shear stress distribution was calculated from the velocity fields and wall shear stress was directly measured by hot-film anemometry (HFA). The floating motion of the valve leaflet resulted in the reduction of pressure drop and recirculating flow region downstream of the valve.

• 대한기계학회논문집B
• /
• 제37권4호
• /
• pp.323-329
• /
• 2013

본 연구에서는 나뭇잎 그물맥 구조를 시뮬레이션하기 위해 잎 그물맥을 상 하 보강 박막판과 비압축성 유체가 흐르는 중간층 구조로 모델링하여 다중물리 현상으로 간주하고, 위상 최적화법을 다중물리 설계영역에 적용하였다. Mindlin-Reissner 판 모델에 기인한 횡방향 전단잠금 문제를 해결하기 위해 P1 비적합 요소와 선택 감소 적분법을 이용하였다. 다시-스토크스 유체 유동 채널에 대해 최적설계법을 적용하여 유동 시스템의 다중물리 모델을 해석하였으며, 잎의 그물맥 시뮬레이션을 수행하였다. 계산된 최적형상을 잎의 자연 그물 맥 패턴과 비교하였으며 비슷한 형상을 얻었다. 이와 같은 학제간 연구를 통해 나무 잎 그물맥 시스템을 이해할 수 있는 계기가 될 것으로 사료된다.