• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2013년도 춘계학술대회 논문집
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• pp.69-70
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• 2013

• 한국정밀공학회지
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• 제25권5호
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• pp.132-139
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• 2008

To meet demand of big capacity and high speed rotation for washing machine, more stress from bending and twisting are complexly loaded onto the shaft supporting the horizontal drum, causing problems in fracture strength and fatigue life. Also, Vibration occurs due to the frequency of the rotating parts. But, shaft has various design factors such as diameter and distance between bearings according to configuration of shaft, the optimal values can't be easily determined. Using a design of experiment (DOE) based on the FEM (Finite Element Method), which has several advantages such as less computing, high accuracy performance and usefulness, this study was performed investigating the interaction effect between the various design factor as well as the main effect of the each design factor under bending, twist and vibration and proposed optimum design using center composition method among response surface derived from regression equation of simulation-based DOE.

• 디자인학연구
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• 제19권1호
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• pp.263-272
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• 2006

주5일제 근무 및 다양한 문화가 급격히 도입함에 따라 가치관이 변하고 있으며 이는 제품사용행태에도 영향을 미치고 있다. 본 연구는 독신 미혼 과 기혼을 대상으로 세탁기 사용 행태와 세탁기 구입 시 주요요인을 비교 분석하여 새로운 소비자로 급부상하고 있는 독신 미혼들을 위한 세탁기 상품개발에 있어 중요한 기초 자료로 활용 할 것을 목적으로 한다. 설문지를 조사도구로 사용하여 빈도분석과 요인분석(Factor Analysis)을 실시하였다. 독신 미혼의 세탁기 구입 시 중요요인으로는 기술 중심의 경제성, 용량, 디자인, 종류, 브랜드, 기능, 6가지가 있음을 알았으며, 기혼은 가격과 기술 중심의 경제성, 사용 편의성, 용량, 기능, 종류에 따른 색상, 광고에 따른 특별 기능, 6가지 중요요인이 있음을 알았다. 경제성 부분에서 기혼은 독신 미혼 보다 더 세탁기의 가격을 중요시하고, 전체적인 경제성의 수치도 미혼은 기혼에 비해 낮은 편이고, 독신 미혼은 세탁기의 특정한 브랜드를 기혼 보다 선호하는 것으로 나타났으며, 기혼의 경우는 광고 및 선전을 통해 여러 상황에 맞춰 구입하는 것으로 나타났다. 이러한 결과는 향후 세탁기 상품개발에 있어 특정소비자를 위한 중요한 자료로 활용 가능하다.

• 한국정밀공학회지
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• 제25권1호
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• pp.99-107
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• 2008

There are being a lot of studies for achievement of high speed Dehydration, high-strength and Lightweight of washing machine in the latest washing machine business. It is essential that strength of mechanical press-Joining (MPJ) for spin drum is improved to attain that target. MPJ of spin drum is composed of seaming and caulking process. Because Seaming process of MPJ has various design factors such as thickness, bending radius, seaming width, caulking press width and the dynamic factor such as multistage plastic working, elastic recovery, residual stress, the optimum conditions can't be easily determined. Using a design of experiment (DOE) based on the FEM (Finite Element Method), which has several advantages such as less computing, high accuracy performance and usefulness, this study was performed investigating the interaction effect between the various design factor as well as the main effect of the each design factor during drum MPJ and proposed optimum condition using center composition method among response surface derived from regression equation of simulation-based DOE.

• 한국의류학회지
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• 제30권2호
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• pp.296-305
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• 2006

This study evaluate the effect of laundering on the deformation of knitted spandex/cotton fabrics compared with that of knitted cotton fabrics. Commercial knitted spandex/cotton and knitted cotton fabrics for T-shits were laundered in a drum-type washing machine and dried in a tumble dryer. Wale spirality, shrinkage, elastic recovery and surface contour of knitted fabrics were investigated under different laundering conditions: washing temperature, presoaking time and washing cycles. Knitted spandex/cotton fabrics had a lower angle of spirality than knitted cotton fabrics. After the first washing cycle, the angles of spirality of all the fabrics had decreased greatly. Knitted cotton fabric of low density deformed more than that of higher density. Knitted spandex/cotton. fabric of low density shrank less, because of the greater extension given during heat-set. Permanent elongation length at the 80$\%$ extension was longer than at the 50$\%$ extension, and the knitted spandex/cotton fabric which was expanded greatly during heat-set had a lower elastic recovery rate. The surface appearance of the knitted spandex/cotton fabrics was worsl~ than that of the knitted cotton fabrics before laundering and after repeated laundering, because of the much protruded cotton fibers from the yarns.

• 한국콘텐츠학회논문지
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• 제14권3호
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• pp.361-373
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• 2014

현재의 산업기술은 날이 갈수록 발달하고 있고, 따라서 기술은 더 이상 생산기업들 간의 유일한 경쟁 요소가 아니게 되었다. 본 논문은 하이얼 세탁기의 성공사례의 연구를 통해서 하이얼 세탁기의 디자인 전략의 구체적 방법을 찾아보았다. 이와 동시에 하이얼 세탁기와 지멘스, 리틀스완 세탁기의 4PS의 비교분석을 통해서, 하이얼의 디자인 전략에 있어서 경쟁 회사들과 어떠한 차이점이 있는지 연구하였다. 그렇게 함으로써 어떻게 기업의 디자인 전략을 체계적으로 분석하는가에 대한 방법 및 어떻게 성공적인 디자인 전략을 수립할 수 있는지에 대한 분석 프레임과 연구방법을 제공하고자 한다.

• 한국정밀공학회지
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• 제28권3호
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• pp.349-356
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• 2011

This paper replaces a conventional austenitic stainless steel sheet to a ferritic stainless steel for the cost reduction of a pulsator cover of a washing machine. However, ferritic stainless steel has poor formability in comparison with austenitic one. The low formability of ferritic steel results in problems during stamping such as fracture, wrinkling, shape inaccuracy and so on. Design modification of the stamping tool is carried out with the aid of the finite element analysis for multistage stamping process of the pulsator cover. The simulation results show that fracture occurs on top of the product while wrinkles are generated by the excess metal near the wing part. Modification of the initial stamping die is performed to improve metal flow and to eliminate problems during the stamping process. Simulation with the modified design fully demonstrates that safe forming is possible without inferiorities.

• 한국의상디자인학회지
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• 제24권2호
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• pp.1-10
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• 2022

The purpose of this study is to analyze the structural properties of 100% wool fabrics knitted with various stitch types and to evaluate dimensional stability from shrinkage in wet cleaning and drying. Materials were weft-knitted from twenty-four different stitches with 7 gauge using a computerized flatbed knitting machine. Weight, thickness, density, and length were measured. A domestic washing machine and a tumble dryer were used for the shrinkage test. The results are as follows: Knitted fabrics were divided into 3 groups based on weight per unit area. Porous knits show light weight whilst milano, pintuck, rib stitches belong to the heaviest group. A positive correlation between weight and thickness was found and the same result was obtained for wale density and weight. Dimensional shrinkage of knitted fabrics was increased during repetitive wet cleaning and drying regardless of knit stitches. Especially, fabrics knitted with float, tuck, cable, and links & links stitches samples were contracted more than 15% in the first treatment whereas 2x1 rib stitch showed 1% shrinkage rate. Fisherman and milano stitches contracted in both course and wale direction with similar shrinkage rates. However, porous knits with float and tuck stitches shrank in course direction by 20% as well as cable samples contracted from 5% to 20% after repeated washing and drying. On the other hand, 30% and 15% contraction of wale direction occurred in orderly float and links & links stitches, respectively. Machine dried knits have a higher shrinkage rate than air-dried knits, but the drying method did not affect to the direction of contraction. In conclusion, variations of knit, tuck, and float stitches affect knit construction and dimensional stability from shrinkage in wet cleaning and drying of wool knitted fabrics.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1994년도 하계학술대회 논문집 A
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• pp.603-605
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• 1994

The Single-Phase induction motor is widely used in home appliances, especially refrigerator, air conditioner and washing machine. Recently many home appliances that use the motor require the speed control to get the various and convenient functions for the customers. Generally it is so hard to control the speed of the Single-Phase induction motor and to get the wide range of the speed variation. In this raper, the speed controller using P-I is designed for the Single-Phase induct ion Motor. The experimental results of the phase controller using P-I show the wide speed control of the Single-Phase induction motor and rebuff control to load change.

• 조명전기설비학회논문지
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• 제29권10호
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• pp.47-53
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• 2015

IPMSM(Insert Permanent Magnet Synchronous Motor) is a very high degree of freedom in the design according to the permanent magnet insertion position. And the performance of IPMSM is affected a lot on barrier shape which determines the magnetic flux path from magnet. Thus the position of permanent magnet and the barrier shape has to be designed by considering both specification and operation condition. In the paper, the permanent magnet and barrier shape which is suitable for direct drive motor of washing machine has been studied. In addition, in order to verify the validity of the study, the test was evaluated by making a prototype motor.