• 한국산업정보학회:학술대회논문집
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• 한국산업정보학회 2002년도 춘계학술대회 논문집
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• pp.1-6
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• 2002

본 연구는 대중교통 수단인 버스를 이용하는 교통약자인 휠체어 장애인의 접근을 돕는 휠체어리프트 개발을 위하여 안전을 고려한 유압시스템과 제어장치를 제작하기 위한 설계기술에 대하여 논하고자 한다. 현대는 고령화시대에 진입하면서 노약자와 장애인의 이동권과 접근권이 문제로 대두되고 있다. 본 연구에서는 기존 전동휠체어장애인과 보호자를 버스에 탑승할수 있는 접근성을 향상하는데 중요한 역할을 하는 리프트를 제작하는 과정에서 발생되는 안정성과 편리성을 중심으로 리프트를 설계 제작하고자 한다. 이 설계기술은 노약자 및 장애인의 이동권과 접근권을 향상시킬 수 있는 전동휠체어리프트의 대량생산체제를 확보하기 위한 중요한 기초자료가 됨으로써 동 제품의 안전도와 정밀도 품질보증 확보에 큰 기여를 하게된다.

• 조명전기설비학회논문지
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• 제29권12호
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• pp.47-54
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• 2015

Normally, multiple socket-outlet is manufactured with soldered, welded permanent connection (termination). Because this procedure is very non-environmental and requires many labor forces, many companies skip this process. To solve this these problems, this research had to design permanent joint type multiple socket-outlet, develop safer multiple socket-outlet than is sold in markets. Progressing this research, we took 3 steps. First, we had to design device for fixing a frame suitable for multiple socket-outlet. Second, this multiple socket-outlet must pass fundamental standards through international standard (IEC 60884-1) and Korean standard (K 60884-1) tests. Third, it had to pass both several mechanical and electrical tests which is more strict than fundamental standards and vibration and impact tests following KS standards for enhancing its safety. After finishing 3 steps, we could obtain objective and fair data, develop environmental permanent joint type multiple socket-outlet without soldering crimped connection.

• 열처리공학회지
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• 제32권6호
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• pp.270-274
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• 2019

In this study, simulation structure analysis was performed for the differential gear system for passenger cars as a prerequisite for the design of the balancing module. The differential gear system was modeled by using CATIA and simulation structure analysis was performed using ANSYS software. The material of the modeled differential gear system uses the mechanical properties of S45C (Q&T). In the structural analysis of the differential gear, the areas where the maximum stress and the maximum strain occurred can be identified. The maximum stress and maximum strain occurred in the pitch circle of the bevel gear. In evaluating the safety factor, it was found that sufficient safety factor was secured. Based on the analysis results for the differential gear, it is expected that it will be a good reference if we design the balancing module device.

• 대한기계학회논문집A
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• 제39권6호
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• pp.639-644
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• 2015

원형 리튬 전지는 노트북, 파워툴이나 전기 자동차와 같이 고용량/고율 방전이 필요한 분야에서 널리 사용되는 이차전지 중의 하나로 저장된 화학 에너지를 전기화학적 반응을 통해 전기 에너지로 변환하는 장치이다. 센터 핀은 원형 리튬 전지 내에 가스 분출 채널 확보를 위해 젤리-롤 중심홀이 충/방전 중 좁혀지는 것을 방지하고, 낙하 충격 시 완충 작용으로 분리막 손상을 방지하여 내부 단락을 막아주는 역할을 담당하는 부품이다. 본 연구에서는 센터 핀의 중요한 역할들에 대해 실험적으로 검증하기 위해서 센터 핀 유/무에 따른 2 가지 실험을 진행하였다. 하나는 연속 50 회 충/방전 싸이클 후의 젤리-롤 중심홀의 변화이고, 다른 하나는 UL 표준 기준에 의한 자유 낙하 충격 실험을 통한 젤리-롤 내 분리막 손상에 의한 내부 단락 여부이다. 이러한 실험적 결과를 바탕으로 원형 전지의 센터핀이 안전성 측면에서 반드시 필요한 부품임을 확인할 수 있었다.

• 한국소음진동공학회논문집
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• 제23권10호
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• pp.878-884
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• 2013

The center of gravity and the moment of inertia of railway vehicles are important parameters for running safety and stability in railway vehicle design. However, the exact measurement of those is difficult in manufacturing field. The weight measurement of a railway vehicle beneath the wheel using a weight scale is off by a large amount. This paper suggests a measurement method for the center of gravity and the moment of inertia of railway vehicles using vibration. For the measurement a railway vehicle is suspended using four wires. Direct measurement of the tension of the wires and the period of swinging motion of the suspended railway vehicle with calculations give the exact location of the center of gravity and the moment of inertia in x, y, and z directions, respectively. This implementation was demonstrated using an experimental device and verified numerically.

• 한국정밀공학회지
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• 제33권7호
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• pp.535-540
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• 2016

The braking device in railway vehicles decelerates or stops the train by dissipating the thermal energy converted from kinetic energy into the air. Therefore, the brake system is crucial for safety. In this paper, we performed a study on an electromechanical brake actuator using an electrical motor as an alternative to pneumatic air cylinders to reduce the idle running time in braking, which subsequently increases braking distance, and to ensure reliable response characteristics. Especially, to analyze the response characteristics of the electromechanical brake actuator, we measure the delay time, response time and power consumption compared to the air cylinder. It is confirmed that the electromechanical brake actuator can reduce reaction time by 0.1 seconds (Braking Action) and 0.46 seconds (Brake Release) compared to the air cylinder.

• 대한기계학회논문집
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• 제16권11호
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• pp.2126-2135
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• 1992

본 연구에서는 국내 원자력 발전소중 영광 3,4호기의 설계자료를 토대로 1/6 크기로 축소한 모델실험을 통해서 공기흡입이 발생하는 임계수위를 결정하는 상관식을 개발하였으며 또한 공기흡입구를 reducer type으로 개선함으로써 공기흡입을 방지할 수 있음을 밝혔다.

• International Journal of Precision Engineering and Manufacturing
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• 제9권4호
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• pp.16-21
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• 2008

The demand for three-dimensional (3D) shape measurements is increasing in a variety of fields, including the manufacture of molds and dies. The most popular technology for 3D shape measurement is the coordinate measuring machine (CMM) with a contact trigger probe. Although a CMM provides a high degree of accuracy, it is inefficient due to its long measuring time. It also has difficulty measuring soft objects that can be deformed by the touch of the contact probe. In addition, a CMM cannot digitize areas that are difficult to reach, and cannot capture very minute details on the surface of complex parts. For these reasons, optical non-contact measurement techniques are receiving more attention since they eliminate most of the problems associated with contact methods. Laser scanning is emerging as one of the more promising non-contact measurement techniques. This paper describes various acquisition considerations for laser scanning, including the accuracy of the 3D scan data, which depends on the charge-coupled device (CCD) gain and noise. The CCD gain and noise of a 3D laser scanner are varied while keeping the other conditions constant, and the measurement results are compared to the dimensions of a standard model. The experimental results show that a considerable time savings and an optimum degree of accuracy are possible by selecting the proper CCD gain and noise.

• International Journal of Naval Architecture and Ocean Engineering
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• 제8권4호
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• pp.375-385
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• 2016

Given the rapid progress made in understanding the dynamics of an offshore floating body in an ocean environment, the present study aimed to simulate ocean waves in a small-sized wave flume and to observe the motion of a cylindrical floating body placed in an offshore environment. To generate regular ocean waves in a wave flume, we combined a wave generator and a wave absorber. In addition, to precisely visualise the oscillation of the body, a set of light-emitting diode illuminators and a high-speed charge-coupled device camera were installed in the flume. This study also focuses on the spectral analysis of the movement of the floating body. The wave generator and absorbers worked well to simulate stable regular waves. In addition, the simulated waves agreed well with the plane waves predicted by shallow-water theory. As the period of the oncoming waves changed, the movement of the floating body was substantially different when tethered to a tension-leg mooring cable. In particular, when connected to the tension-leg mooring cable, the natural frequency of the floating body appeared suddenly at 0.391 Hz as the wave period increased.

• 한국기계가공학회지
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• 제18권8호
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• pp.82-90
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• 2019

We propose an equivalent model of a sintered metal mesh filter calculated by Ergun's equation and polynomial regression for the CFD analysis of breakaway devices at a hydrogen fueling station. CFD analysis of filters that cause high pressure loss is essential because breakaway devices in high-pressure hydrogen conditions require low pressure loss. A differential pressure experiment with a filter was performed in a low-pressure air condition considering similarities. An equivalent model was developed by deriving the resistance value by the polynomial regression using the experimental results. The results of CFD analysis using the equivalent model show that there was almost no error in the operating condition of the breakaway device compared to the experimental results. Through this work, we believe that the proposed equivalent model of a filter can be applied to the analysis of breakaway devices in hydrogen fueling stations. We will study how to optimize the shape and position of the filter in breakaway devices using the developed equivalent model.