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김광우(K. W. Kim),최낙삼(N. S. Choi) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.8
A double cantilever sandwich-beam method for evaluating the frequency dependence of dynamic characteristics of rubbers has been studied. A finite element simulation in combination with the sine-sweep test was used for the flexural vibration analysis of the beam specimen with an inserted rubber layer. Quadratic relationships of dynamic elastic modulus and material loss factor of rubbers with frequency were obtained employing the least square error method.
K.W. Kim(김광우),K.J. Woo(우관제),G.J. Park(박경진) 한국철도학회 2012 한국철도학회 학술발표대회논문집 Vol.2012 No.5
The railway vehicle industry faces increasing pressure to enhance performance and safety while minimizing weight, manufacturing cost and fuel consumption. Structural optimization can be an effective method to design the structure of a railway-car body. In recent years, there have been many applications that design the structure of a vehicle body with aluminum material. The mass and stiffness of the structure can be determined by changing the shape and thickness of the webs and ribs. In this research, a design process based on structural optimization is proposed to design the rib shape of each unit and the entire thickness distribution of an aluminum railway-car body. The process for a systematic design of an car body is established to reduce the weight while sufficient strength is kept.