Conventional product development process employs a design-build break philosophy which is sequentially executed product development process. It often results in a prolonged lead-time and a high product cost. This paper proposes the concurrent engineering design approach integrating design process to solve the above problems. The proposed approach in this paper holds potential for shortening the overall product development cycle, improving product quality, and reducing product cost. This paper presents three concepts and methods for product development : (1) considering product performance, quality and cost together in early design stage, (2) supporting design decision-making through a quantitative approach, and (3) incorporating rapid prototyping and virtual prototyping for design verification.
Recently, the automotive part manufacturers have made a lot of efforts to increase the reliability of their products for various reasons. For that reason, many manufacturers have tried to get the automatic inspection system for their products. The automatic system can reduce the number of the workers and increase the accuracy of the inspection. In this study, inspection subject is brake-hose resonator. This component is made through a high frequency bonding process and can have the possibility of a defect like a leak problem. The purpose of this study is to make the automatic inspection system for detecting the implied leak problem of the products with the vision system. Consequently, this study show that the vision system is a very reasonable method to detect the leak problem. The automatic inspection system can decrease the detection time from 35s/EA to 22s/EA in case of continuous operation.
A valve open/close degree measuring device is used for an indicator of a valve actuator. This device indicates an opening and closing of a valve or throttle in a hydraulic actuator. In ship, equipments requires safe and robust because of a rough environment and a specific condition during a voyage. Thus, the open/close degree measuring device must be developed which can be used at an outdoor environment. This study developed the open/close degree measuring device using a volumetric measuring method(25㎖/100㎖). The housing of the open/close degree measuring device was made by a stainless steel with surface painting after an anodizing coating.
This paper is discussed the design of the Dome type control valve. It is designed by the results of Fluent analysis. The results of analysis is similar to the experimental data. Dome type control valve is possible to use the high pressure and temperature condition and is easy to control by the remote. It is operated by the air pressure and worked in the low pressure range. Also it can be changed the flow velocity line by the modified geometry of the rod & plug of valve.
Recently, it was a very interesting subject to reduce the weight of the parts in the whole industry. A number of manufacturers have tried to reduce the weight as making light material alloy like aluminium and magnesium alloys. Agitation system can maximize the density of melted metal alloy and improve the mechanical property. Ultrasonic agitation system is considered as the method of agitation for making aluminium alloy product.
In this study, I've designed the cooling unit of the ultrasonic agitation system. The design of the cooling unit was made through the analysis of the thermal behavior and thermal stress of the agitation system. The results of analysis showed that the cooling units must be applied to the agitation system. They also showed the flux of the cooling water and the effects of the cooling system.
This paper represents the cold energy for liquefied nitrogen gas and cascade refrigerator. In this study, the vaporizer of liquefied nitrogen gas has the fin coil tube type with the dimension of inside diameter of 10mm and outside diameter of 12mm. Also, the total length of vaporizer is 20,000mm. The main experimental parameters are the mean velocity in duct and the supplied flow-rates of liquefied nitrogen gas. For the cascade refrigeration system, the refrigerants are ethane(R-170) in the high pressure stage and R-22 in the low pressure stage.
Composition element of power-up reset circuit is consisted with many PMOS and by capacitors, reduce number of used element to improve power-up reset circuit to secure stable early action of memory chip, and size of element decreases and consumption area of circuit itself could reduce about 10%.
In this paper, when rise slowly existing circuit and circuit that improve by comparison simulation result and power rise time 200㎳ to confirm stability of circuit action, output voltage waveform peak of improved power-up reset circuit secures more than 2Vt, and displayed stabler circuit action than change width few existing circuit by temperature.