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공간크기에 따른 로켓모타 충격소음의 비교분석에 관한 연구
송기혁 ( Kee Hyeok Song ),정성학 ( Sung Hak Chung ),강우람 ( Woo Ram Kang ),이덕주 ( Duk Ju Lee ),박종호 ( Jong Ho Park ) 한국안전학회(구 한국산업안전학회) 2014 한국안전학회지 Vol.29 No.3
The purpose of this study is to analysis the 3 differential size of the interior space for impulse noise. To achieve this goal the 3 kinds (27, 35, 50 m3) of interior space were performed comparing the impulse noise. Result of this study, the standard error of the mean peak sound pressure of value from 0.19 to 0.27dB and there was no significant difference (p<0.01). And B-duration is significant differences (P<0.01) range from 3.98 to 7.93ms. This is respectively less than 10ms. These findings are confirmed in accordance by the 3 differential space size of the indoor-impulse noise due to 0.3 dB or less, so there was no difference to the operational influence. And also below 100 Hz were found fundamental mode frequency analysis. Results were matched with calculated theoretical values.
마호성(Ho-beong Mha),박병진(Byung Jin Park),이덕주(Duk Ju Lee) 호서대학교 공업기술연구소 2007 공업기술연구 논문집 Vol.26 No.1
The dynamic behaviors of the pile-foundation of a bridge under earthquakes is analyzed to see the effect of the near-by soil foundation to the pile, using the commercial code MIDAS GTS . The soil-structure interaction(SSI) is examined by comparing the results of pile-foundation from both models with and without including the upper bridge mass. The displacements and accelerations of the pile at the different depths are evaluated and the maximum values obtained from time-histories of each value are depicted. The amplification and effect of SSI can be seen from the results.