• 프린팅코리아
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• v.8 no.2
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• pp.88-89
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• 2009

(주)지엠피(대표이사 김양평, www.gmp.co.kr)는 최근 RFID안테나 생산용 롤 코터의 개발에 성공했다고 발표했다. 지엠피는 지식경제부의 주관 사업으로 진행된 중기거점개발사업의 하나인 'RFID 안테나 생산용 롤코터' 개발사업의 주관기업으로 선정된 지난 2006년 6월부터 총26개월에 걸쳐 기술개발을 진행해 왔으며 최근 산업기술평가원이 심사한 최종평가 결과 '성공'이라는 평가를 받아 그동안의 노력이 결실을 맺게 되었다. RFID 롤 코터기 개발과제에는 총 기술개발사업비 10억3760만원이 투입되었으며 이 가운데 정부출연금은 7억7280만원, 지엠피의 현물부담금은 2억6480만원이 소요되었다. 이번에 성공으로 평가 받은 것은 그동안의 기술개발기간을 마무리하고 최종 시제품에 대한 기술평가 심사과정에서 성공적이라는 결과를 받은 것이어서 그 의의가 더욱 큰 것으로 평가되고 있으며 RFID 사용의 확산에 중요한 전기를 마련하게 될 것으로 보인다.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2012.05a
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• pp.225-229
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• 2012

대기가 희박한 고고도 환령이나 급격한 선회를 위해 2차분사에 의한 추력벡터제어를 사용한다. 8개의 2차분사구를 갖는 고체로켓모터를 대상으로, 2차분사의 유량을 조절하는 밸브의 개도가 추력, 측추력 및 롤 모멘트에 미치는 영향을 해석적으로 연구하였다. 정상 상태의 3차원 Reynolds Averaged Navier-Stokes 식의 해를 구하였으며, 난류를 위해 Spalart-Almaras 모델을 사용하였다. 수치해석의 타당성을 평가하기 위해 실험 결과와 해석결과를 비교하였다. 밸브의 개도가 증가함에 따라 추력은 감소하나 측추력은 증가한다. 반면, 롤 모멘트의 경우, 밸브와 2차분사 파이프의 상호작용에 의해 개도에 비례하지 않는다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2003.10a
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• pp.280-280
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• 2003

• Transactions of the Korean Society of Mechanical Engineers A
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• v.36 no.11
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• pp.1421-1426
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• 2012

Cornering maneuvers with reduced body roll and without comfort loss are important requirements for car manufacturers. An electric active roll control(ARC) system controls the body roll angle by using motor-driven actuators installed at the centers of the front and rear stabilizer bars. Co-simulation using the Matlab/Simulink controller model and the CarSim vehicle model was proposed to evaluate the performance of the ARC control algorithm. To validate the performance of the ARC actuator and system, bench tests and vehicle tests were proposed.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.36 no.4
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• pp.429-435
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• 2012

An abrasion due to continuous friction between a work roll and strip causes the mass of the work roll to be unbalanced in the rolling process. We developed a mathematical model for the rolling mill considering the unbalanced mass and verified the model experimentally. The work roll was approximated as a rigid rotor with eccentricity, and the effect of the unbalanced mass on chatter vibration was investigated. The joint forces computed by quasistatic analysis were applied to the work roll in the rolling mill. Transient responses were obtained, and frequency analysis was performed by solving equations of motion using a direct integration method. Horizontal vibrations were more strongly affected by eccentricity than vertical vibrations. In the horizontal direction, a small eccentricity of 1% of the work roll radius considerably increased the amplitude of the chatter frequency.

• Transactions of the Korean Society of Mechanical Engineers
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• v.16 no.5
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• pp.829-837
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• 1992

This paper presents a new approach for the analysis of hot strip rolling processes. The approach is based on the finite element method and capable of predicting velocity field in the strip, temperature field in the strip, temperature field in the roll, and roll pressure. Basic finite element formulations for heat transfer analysis are described with emphasis on the treatment of numerical instability resulting from a standard Galerkin formulation. Comparison with the theoretical solutions found in the literature is made for the evaluation of the accuracy of the temperature solutions. An iterative scheme is developed for dealing with strong correlations between the metal flow characteristics and the thermal behavior of the roll-strip system. A series of process simulations are carried out to investigate the effect of various process parameters including interface friction, interface heat transfer coefficient, roll speed, reduction in thickness, and spray zone. The results are shown and discussed.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2012.05a
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• pp.489-490
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• 2012

• Magazine of RCR
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• v.4 no.3
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• pp.36-40
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• 2009

• Proceedings of the KSME Conference
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• 2005.11a
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• pp.194.1-194.1
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• 2005

• Proceedings of the KSME Conference
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• 2005.11a
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• pp.204.1-204.1
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• 2005