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다구치방법과 전달행렬법을 이용하여 지반진동을 받는 감쇠전단구조물의 진동저감 연구
조찬우(Chan U Jo),이정우(Jung Woo Lee),김동원(Dong-Won Kim),이정윤(Jung Youn Lee) 한국소음진동공학회 2019 한국소음진동공학회 논문집 Vol.29 No.4
Damped shear structures are widely used in industrial plant construction and building design but are often excited during ground vibrations. The study of vibration response of these structures is important for both accurate product production and building design. Traditionally, finite element methods such as ANSYS have been used as the main method for calculating the response of these structures. However, when interpreting shear structures, this method is not as efficient because the matrix is larger than the transfer matrix. In this study, we developed an extended transfer matrix method to analyze damping shear structures. The transfer function and the ground vibration are used to obtain the response of the shear damping structure. Using the Taguchi method, optimum design parameters were found to minimize the response of the structure caused by ground vibrations.
전달행렬법을 이용하여 지반진동을 받는 전단구조물의 응답해석
조찬우(Chan U Jo),이준성(Joon-Seong Lee),이정윤(Jung Youn Lee) 한국소음진동공학회 2018 한국소음진동공학회 논문집 Vol.28 No.5
Shear story structures are widely used in industrial equipment structure and building design but are often vibrated during the vibration of the ground. Ground vibration is caused by many variables such as earthquake, mechanical vibration, vehicle and human steps. As a result, a study on the vibrational response of this type of structure is important to both accuracy product and future building designs. Traditionally, finite element methods such as the ANSYS and MIDAS have been used as the primary methods of computing the response of such a structure. However, these methods yield low calculation efficiencies. In this paper, the mechanical model of a four-story shear structures is constructed based on the expanded transfer matrix method. The expanded transfer matrix of the components in the model and the total transfer matrix equation of the structure are derived, and the corresponding MATLAB program is compiled to determine the natural frequencies and response of the structure. The results of the transfer matrix are in good agreement with the results of the modal analysis.
Jung Woo Lee(이정우),Chan U Jo(조찬우),Joon Seong Lee(이준성),Jung Youn Lee(이정윤) 한국소음진동공학회 2017 한국소음진동공학회 논문집 Vol.27 No.6
This study analyzes the cause of three numerical instabilities for the transfer matrix method (TMM) by controlling the precision of the arbitrary digits in the numerical device as follows: (1) the missing natural frequency, (2) the inaccurate results, and (3) the computational difficulty of the high-order natural frequency. Two types of TMMs are examined. One TMM is composed of the trigonometric and hyperbolic functions (4×4 TMM) for the transverse vibration of a straight beam, and the other is composed of exponential functions (8×8 TMM) for the coupled bending vibrations of a twisted beam. TMMs with numerical stability can obtain the eigenpairs of over 220 up to the overflow (2<SUP>1024</SUP>) in the numerical device. The explicit range capable of computing the eigenpairs using the 4×4 and 8×8 TMMs without any modifications is proposed in the analyzed results.
Jung Woo Lee(이정우),Chan U Jo(조찬우),Joon Seong Lee(이준성),Jung Youn Lee(이정윤) 한국소음진동공학회 2018 한국소음진동공학회 논문집 Vol.28 No.3
This study proposes a new methodology capable of demonstrating the contribution rate of in-plane and out-of-plane strain energies on the natural frequencies for the coupled bending vibrations of a twisted beam. This research has analyzed this effect for the first time. A numerical method was deduced from the relationship between the maximum strain and kinetic energy, and uses the exact shape functions obtained from a local coordinate system. This analytical method can also demonstrate physical phenomena such as a variation of the eigenfrequencies relying on the twist angles. The contribution rates were examined based on twisted beam examples under various boundary conditions.
김익희(Ik Hee Kim),조찬우(Chan Woo Jo),최선호(Seon Ho Choi),김태준(Tae Jun Kim),금보성(Bo Seong Geum),이창훈(Chang Hun Lee),유동인(Dong In Yu) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
This paper describes the analysis of the contact angle to determine the drain performance according to tube material of the micro channel heat exchanger. The contact angle of the droplet depends on whether the fin surface is homogeneous or heterogeneous and also depends on the topography. A study was conducted to find a method with optimal drain performance by analyzing the contact angle by varying the material and surface characteristics of the fin.