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채장범(Chai, Jangbom),김태환(Kim, Taekwan) 한국소음진동공학회 2005 한국소음진동공학회 논문집 Vol.15 No.6
Statistical Energy Analysis(SEA) has been considered as a Possible method for predicting responses of complex structures, especially at higher frequencies. In this paper, an SEA model of a vehicle was built using 138 energy storing subsystems connected together using 1019 Junctions. SEAM software program was used to build and calculate the model. To demonstrate the accuracy of the SEA model, predicted response levels were compared with measured levels. The source Input levels were measured at the engine mounting parts. There is good agreement between the estimated and the experimental results. This paper also identifies some dominant energy flow paths from sources. It is finally presented that the SEA model can optimize the design parameters of vehicles using model parameters and energy flow paths.
이대형(Daehyeong Lee),채장범(Jangbom Chai),조병남(Byeongnam Jo) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
In this study, specific heat capacity of binary molten salt-based graphite nanofluids was experimentally measured for two different salt mixtures: nitrate salt mixtures and carbonate salt mixtures. The graphite nanoparticles were doped into each salt mixtures to synthesize the high temperature nanofluids. The specific heat capacity of the nanofluids was measured by a differential scanning calorimetry in both solid phase and liquid phase. To examine the effects of solute (graphite nanoparticles) and solvent (molten salt mixtures), the concentration of the nanoparticles was varied from 0.1 to 1.0 wt. %, and three different chemical compositions of salt components for each salt mixture were employed including eutectic composition. In results, the specific heat capacity of the carbonate salt mixtures was drastically enhanced up to 17.1 %, whereas the specific heat capacity of the nitrate salt mixtures was decreased to 15.9 % in maximum. These distinct results were explained by formations of nanoparticle-induced nanostructures and compressed liquid layer using scanning electron microscope and molecular dynamics simulations, respectively.