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김찬중(Chan-Jung Kim),김규식(Ku-Sik Kim),강호영(Ho-Young Kang),진여화(Yeo-Hwa Jin),이봉현(Bong-Hyun Lee) 한국소음진동공학회 2010 한국소음진동공학회 학술대회논문집 Vol.2010 No.10
The direct design modification of problematic component is disallowed in order to sacrifice other major factors such as a stability of system or a major performance. So, the best design policy is to revise the immature structural mechanism under the minimal design change as soon as possible. For this, the paper presents a new design sensitivity analysis based on transmissibility ratio (TR) of response acceleration to find a proper candidate for the minimal design modification. The new sensitivity analysis is based on the fact that the sensitivity of TR over a small design change is inversely proportional to the magnitude of TR. The theory of proposed design sensitivity analysis is simulated with a simple five-degree-of-freedom system and confirms that the sensitivity result is well matched with the variance of TR over a dynamic change. Then, new methodology is applied for a linear elastic specimen to detect the most sensitive node over a design change using measured acceleration data during uni-axial vibration test. The physical verification of the sensitivity method is conducted on the CAE model of a linear elastic specimen by adding concentration mass and the vibration fatigue of the simple specimen is analyzed to estimate the relationship between fatigue behaviors and sensitivity consequences.
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