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신영재(Y.J.Shin),W.Soedel(W.Soedel) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
In this study. the equation of motion of the conical coil spring including damping is derived and natural frequencies and mode shapes of the conical coil spring are obtained for some boundary conditions. The response of the system with the conical coil spring is analyzed by using the receptance method. Numerical analyses of the conical coil spring are performed. Characteristics of conical coil spring is discussed for various conditions.<br/>
ANALYSIS OF THE BEATING RESPONSE OF BELL TYPE STRUCTURES
Seock-Hyun, Kim,W,Soedel,J. M. Lee 江原大學校 附設 環境硏究所 1994 環境硏究 Vol.11 No.-
The impulse response of a ring-stiffened cylindrical shell, with an attached concentrated mass, is analyzed. It is a simplified model of a Korean bell structure. The objective is to study the beating response, which is a purposefully designed, unique feature of Korean bells. Based on the receptance method, modal characteristics of the total system are determined in terms of natural modes and frequencies of an unstiffened cylindrical shell and a ring. In this study, the receptance technique is employed repeatedly (in two steps), since it would have been difficult to simultaneously handle the line receptance of a ring and the point receptance of a concentrated mass. Numerical results show how the frequency levels and major modal characteristics of the original shell can be changed by the ring stiffening, and how the asymmetry due to the concentrated mass introduces beating when the structure is subjected to impact. The analysis can be utilized for the control of dominant frequencies and beat frequencies of Korean bell structures in the design stage, but has much more general application possibilities.