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Full Scale Performance Prediction of an Energy Saving Device by Using Computational Fluid Dynamics
Sunho Park,Gwangho Oh,Shin Hyung Rhee 한국전산유체공학회 2014 한국전산유체공학회 학술대회논문집 Vol.2014 No.10
Recently interest on energy saving devices (ESD’s) has increased with the enforcement of the energy efficiency design index (EEDI) verification proposed by the international maritime organization (IMO). Extension of propulsive performance results from model to full scale ships plays an important role in verification of ships with ESD’s. The present study proposed a reliable and efficient propulsive performance prediction method for full scale ships with ESD’s. The propulsive performance prediction in full scale KVLCC2 with pre-swirl stator (PSS) was conducted by the proposed method. Its results were then compared with those by the existing extension methods and by full scale CFD computations. From the results, it was confirmed that the proposed method could extend the model scale results to full scale ones with ESD’s performance improvement effects. Unlike the existing methods, it takes into account of ESD’s and consumes much less computational resources and time than full scale CFD computations.
Lee, Sanghyo,Ko, Wonbae,Oh, Yujin,Lee, Jongsun,Baek, Gwangho,Lee, Younhee,Sohn, Junginn,Cha, Seungnam,Kim, Jongmin,Park, Jeagun,Hong, Jinpyo Elsevier 2015 Nano energy Vol.12 No.-
<P><B>Abstract</B></P> <P>Wearable energy harvesting devices are of increasing importance for the realization of flexible smart electronics, as the basic building blocks of power sources are able to convert the mechanical energy induced from body movement to electricity. Here, we report the electrical responses of a textile substrate-based triboelectric nanogenerator (T-TENG), including nanostructured surface configurations provided by Al nanoparticles and PDMS, in which no intricate fabrication process was performed or required. Along with analysis of the working principle and finite element simulation, the textile-based output power density of 33.6mW/cm<SUP>2</SUP> was obtained from the periodic mechanical stress of an adjustable bending machine, and this was used to activate commercially available light emitting diode (LED) bulbs. Additionally, we demonstrated the generation of sufficient energy from clothes attached to a commercial arm sleeve to power the LED devices from the activity of a human arm. Our practical cloth approach may contribute to a general framework for developing functional and self-powered wearable electronic devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Textle substrate was used to develope functional self-powered energy harvester. </LI> <LI> Electrical features of T-TENG was manipulated by various surface configurations. </LI> <LI> A self-powered clothes was demonstrated as one example of energy harvester. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Textile substrate-based triboelectric nanogenerator (T-TENG) including nanostructured surface configurations provided by Al nanoparticles and PDMS has been demonstrated for the generation of energy from clothes attached to a commercial arm sleeve in order to power the LED devices from the activity of a human arm.</P> <P>[DISPLAY OMISSION]</P>
ITC와 HSC가 적용된 급곡선 주행시스템 성능검증을 위한 동역학 해석
조연호(Yonho Cho),오형식(Hyeongsik Oh),강광호(Gwangho Kang),엄경수(Kyongsu Eom) 한국철도학회 2017 한국철도학회 학술발표대회논문집 Vol.2017 No.05
저심도 도시철도시스템을 위해 개발중인 급곡선 주행시스템은 15mR급곡선 구간 주행 시 횡압을 30%이상 저감하기 위한 개별모터토크제어(ITC: Individual Torque Control) 기술과 유압식 조향실린더 제어(HSC: Hydraulic Steering-cylinder Control) 기술을 적용하고 있다. 본 논문은 ITC와 HSC가 적용된 급곡선 주행시스템의 성능검증을 위해 Simpack을 이용한 동역학 해석을 수행하였으며, Simpack에 내장된 PID제어 함수를 이용하여 횡변위와 요 각 제어 수행한 결과를 비교하여 분석하였다. 실제 시험차량을 통한 성능시험을 준비 중에 있으며 시험결과와의 비교를 통해 동역학 해석모델의 정확성을 검증할 예정이다. The sharp curve running system which develop for NST(Near Surface Transit) to reduce the lateral force more than 30% during run on the 15mR sharp curve section adopt the ITC(Individual Torque Control) and HSC(Hydraulic Steering-cylinder Control) technology. This paper describe the dynamic analysis results by Simpack software to evaluate the performance of sharp curve running bogie with ITC ad HSC and comparative study results with lateral displacement control and yaw angle control by internal PID control function of Simpack. The running test with real train is prepared. The accuracy of dynamic analysis results is to verify by compare with the running test results.