This study analyzes about Bicycle saddle in operation through the analysis of Fatigue life and structural safety, equivalent Stress, maximum deformation. Maximum equivalent stress is analysis applied with force. The structural result of this study can be effectively utilized with the design of Bicycle saddle by investigating prevention and durability against its damage.
The primary objective of this study is to developed shuttle valve having microscopic groove for smooth and quick operation. Generally shuttle valve are controlled both sides, microscopic groove of developed shuttle valve in this study ensured open-close smoothly and quickly. The test for performance of development shuttle valve is noise test, durability test, pressure test and leakage test. The dB(A) levels of noise test was closed background noise. The durability test was gave load pressure of 2.0 kgf/cm² for 15,000 cycles. The press test was loaded press(1.5 times of maximum allowable pressure) for 15 seconds. And the leakage test was loaded press(1.1 times of maximum allowable pressure) for 15 seconds. The results of these test are showed excellent performance, and performance of developed shuttle valve in this study was verified sufficiently.
자동차 생산공장 내에서 생산되어진 여러 제품들을 이송시키는 경우 생산라인에 인원배치가 되어있어 육안으로 확인 가능한 생산라인 부분 혹은 CCTV 등으로 확인이 가능한 지역이 있는 반면 확인 불가능한 지역도 있다. 전자의 경우는 사고처리가 비교적 편하지만 만약 육안으로 확인 불가능한 곳에서 사고가 일어난다면 사고 발생 후 라인이 정지된 상태에서 비로소 확인이 가능하고 원인분석 등의 대응에 도입이 가능하다. 금강오토텍에서는 이번 현장맞춤형 기술개발 사업을 통해 자동차 생산공장 내 자동화 운반물 이송 시스템의 돌발적인 충돌 및 적재물 추락 사고에 대한 자체 기록이 가능하고, 실시간 무선 송신으로 관리자가 상황을 즉각적으로 판단할 수 있게 하는 자동이송 전차를 개발 계획 중이다. 이를 위해 이송전차에 탑재 가능한 소리 및 충격 센서와 실시간 영상기록장치, 영상을 보내주는 무선 송신기를 개발, 설치해 상기 문제점을 해결하려 한다.
This study analyzes lifes and damages at automotive tie rod through the structural analyses with fatigue. The structural result of this study can be effectively utilized with the design of automotive tie rod by investigating prevention and durability against its damage.
Electrical Moving system(EMS)은 제조업(주로 자동차 생산공장 및 전자제품 생산공장, 식품공장 등) 생산공장에서 사용되는 무인 자동화 운반설비를 말한다. 지금으로부터 200년전 James Ford가 개발했던 공장자동화의 역사는 산업혁명을 거치면서 발전을 거듭하였으며 최근에는 작업자의 안전 및 돌발적 사고로 인한 생산성 급감이 생산공장에서는 중요한 이슈로 떠오르고 있으며, 이를 보완하기 위한 기존 시스템의 운반설비 시스템에 더욱 스마트한 기능을 더한 자동화설비에 대한 필요성이 증대되었다. 이를 위해 먼저 현재 생산중인 제어부 전차반의 크기를 기존 대비 30 % 정도 compact하게 재설계하여 소형화함으로써 사고를 줄이며 스마트한 기능은 더욱 증대시킨 제어부 표준전차반 제작을 실시하고자 한다.
High luminance LED fluorescent light is replaced by halogen light in recent light parts. The housing cover of LED fluorescent light is used many several materials. Though deformity character has less value, polycarbonate cover has cheap, high strength and it is used general purpose. This study is several purposes. 1. No entering foreign matters during continuous extrusion manufacturing process in cutting process, 2. No deformity, exact cutting of pc length and finding method of cutting manufacturing process for polycarbonate cover
LEDs are increasingly used for many applications including automotive, display and special lighting applications. The performance and lighting characteristics of the LED depend on cooling condition because the power LED generates lots of heat. In this study, the effect of the generated heat from power LED module on lighting characteristics and performance is measured and evaluated. For experiments, the transient temperature of a power LED module with cooling condition is measured.
Axial flow fan under certain condition may stall. The rise in pressure across the impeller blade of an axial flow fan depends on the angle of attack. At a low back pressure, the air volume will be large and the angle of attack is small. In this study, the time dependent Navier-Stokes equations are numerically solved in large size axial-flow fan with groove
In this study, the potential possibility of bioenergy was investigated as an alternative fuel for a naturally aspirated indirect injection diesel engine. The smoke emission of biodiesel fuel was reduced remarkably in comparison with diesel fuel, that is, it was reduced approximately 64% at 2500rpm, full load condition. And, power, torque and brake specific energy consumption showed no significant differences. However, NOx emission of biodiesel fuel was slightly increased compared with the commercial diesel fuel.
In this paper, a three dimensional numerical analysis tool was applied to study the PEMFC performance characteristics. The porosity and electrical conductivity of GDL and CL as well as the relative humidity of anode and cathode channel gas were selected as simulation parameters. As the porosity of GDL and CL increases, current density and temperature increase because reactant gases diffuse well. As the electrical conductivity of GDL and CL increases, current density and temperature increase due to increased electron transfer rate. As anode relative humidity increases, current density and temperature increase. Unlike anode, current density and temperature increase when cathode relative humidity increases from 0 percent to 60 percent. Then current density and temperature decrease when cathode relative humidity increases from 60 percent to 100 percent.
The heat generated in contact type braking system can cause an unacceptable braking performance. Thermal behavior of ventilated disk brake system is presented in this paper. The temperature and velocity fields of 3-D unsteady simulated model are obtained using a software package "FLUENT". The numerical results show that there exits a temperature nonuniformity between the disk faces contacting with pads. The conduction rate through the disk and pad is calculated and the effect of material conductivity is also investigated.
A numerical analysis was performed to study PEMFC characteristics depending on GDL porosity and the inlet direction in cathode gas channel using the FLUENT. As GDL porosity increases, temperature increases. For the both of co-flow and counter-flow cases, temperature is higher near the hydrogen inlet region where the chemical reaction rate is high. As GDL porosity increases, current density increases. In overall, counter-flow case gives higher current density compared to co-flow case for the same operating conditions. However, the difference in the current density is not high. The water mass fraction is also higher near the hydrogen inlet region due to the chemical reaction rate for the both of co-flow and counter-flow cases.
This experimental study was investigated the flow characteristics around staggered cooling tube arrays. A particle image velocimetry technique was employed to obtain detailed measurements at inlet-velocity-based three Reynolds numbers and the frequency characteristics of the wake were analyzed by using spectral analysis of the measured wake velocity signals. As a results, the flow exhibits strong Reynolds number dependence in the developing region but no significant Reynolds number effects are observed in the spatially periodic region.
In this paper, numerical investigation of transition characteristics in a square-sectional curved duct flow. Computational fluid dynamic(CFD) simulation was performed using the commercial CFD code FLUENT to investigate the transition characteristics. The flow development is found to depend upon Dean number and curvature ratio. The velocity profiles in center of the duct have lower value than those of the inner and outer walls.
The smoke emission of biodiesel fuel was reduced remarkably in comparison with diesel fuel, that is, it was reduced approximately 36% at 2000rpm, full load condition. And, power, torque and brake specific energy consumption showed no significant differences. However, NOx emission of biodiesel fuel was increased compared with commercial diesel fuel. Also, the effects of exhaust gas recirculation(EGR) to reduce the NOx emission has been investigated. It was found that simultaneous reduction of smoke and NOx was achieved with biodiesel fuel(20vol-%) and cooled EGR method(10 ∼15%).