• Title/Summary/Keyword: 전달동강성계수

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Torsional Vibration Analysis of Shaft System Using Transfer Dynamic Stiffness Coefficient (동강성계수의 전달을 이용한 축계의 비틀림진동 해석)

  • Moon, D.H.;Choi, M.S.;Sim, J.M.
    • Journal of Power System Engineering
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    • v.1 no.1
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    • pp.91-97
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    • 1997
  • Recently, it is increased by degrees to construct complex and large structures. In general, in order to solve the dynamic problem of these structures they have used finite element method(FEM). In this method, however, it is necessary to prove whether its results are correct or not. Therefore it requires much effort, time and many expenses for dynamic analysis of complex and large structures. Authors have developed the transfer dynamic stiffness coefficient method(TDSCM) which is the new vibration analysis method for complex and large structures on personal computer, and confirmed that the results of this method are good for these structures on personal computer. In this paper, TDSCM is applied to the torsional vibration analysis for the shaft system which consist of concentrated disks and shafts of continuous body. First, we formulate algorithms for torsional free and forced vibration analysis, and compare the results of TDSCM and FEM.

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Forced vibration analysis of beam-like structures by the combination and transfer of dynamic stiffness coefficient (동강성계수의 조합 및 전달에 의한 보형 구조물의 강제진동 해석)

  • 문덕홍;최명수
    • Journal of Advanced Marine Engineering and Technology
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    • v.22 no.1
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    • pp.21-27
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    • 1998
  • The authors have developed the transfer dynamic stiffness coefficient method(TDSCM) which is based on the concepts of the substructure synthesis method and transfer influence coefficient method. As a result, we suggested the algorithm for free vibration analysis of beam-like structures which are mainly found in mechanical design by applying the TDSCM in the previous reports. In this paper, we extend this algorithm to the forced vibration analysis for them. And we also confirmed the merits of this method.

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A Practical Research of Engine Mount Optimization in a Construction Equipment (건설기계 엔진마운트 최적설계에 관한 실용적 연구)

  • Shin, Myung-Ho;Joo, Kyung-Hoon;Kim, Woo-Hyung;Kim, In-Dong;Kang, Yeon-June
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2013.10a
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    • pp.792-796
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    • 2013
  • A practical process to optimize engine mounts on construction equipment is presented in this research. Transmitted force from the engine is estimated by using stiffness of the mount rubber which varies with frequency, amplitude and pre-load, and by the engine excitation force that comes from piston mass and gas pressure and so on. The transmitted force is measured through TPA(Transfer Path Analysis) and is then compared with the estimated force. The optimum mount position and stiffness are solved using MATLAB. The result shows the improvement on engine mount vibration.

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Longitudinal and Flexural Vibration Analysis of a Beam Type Structure by Transfer Stiffness Coefficient Method (전달강성계수법에 의한 보형구조물의 종.굽힘진동해석)

  • Moon, D.H.;Choi, M.S.;Kim, Y.B.
    • Journal of Power System Engineering
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    • v.2 no.1
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    • pp.59-66
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    • 1998
  • The authors have studied vibration analysis algorithm which was suitable to the personal computer. Recently, we presented the transfer stiffness coefficient method(TSCM). This method is based on the concept of the transfer of the nodal dynamic stiffness coefficients which are related to force and displacement vectors at each node. In this paper, we describes the general formulation for the longitudinal and flexural coupled vibration analysis of a beam type structure by the TSCM. And the superiority of the TSCM to the finite element method(FEM) in the computation accuracy, cost and convenience was confirmed by results of the numerical computation and experiment.

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Forced Vibration Analysis of Lattice Type Structure by Transfer Stiffness Coefficient Method (전달강성계수법에 의한 격자형 구조물의 강제진동 해석)

  • 문덕홍;최명수
    • Journal of KSNVE
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    • v.8 no.5
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    • pp.949-956
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    • 1998
  • Complex and large lattice type structures are frequently used in design of bridge, tower, crane and aerospace structures. In general, in order to analyze these structures we have used the finite element method(FEM). This method is the most widely used and powerful method for structural analysis lately. However, it is necessary to use a large amount of computer memory and computational time because the FEM requires many degrees of freedom for solving dynamic problems exactly for these complex and large structures. For analyzing these structures on a personal computer, the authors developed the transfer stiffness coefficient method(TSCM). This method is based on the concept of the transfer of the nodal dynamic stiffness coefficient matrix which is related to force and displacement vector at each node. And we suggested TSCM for free vibration analysis of complex and large lattice type structures in the previous report. In this paper, we formulate forced vibration analysis algorithm for complex and large lattice type structures using extened TSCM. And we confirmed the validity of TSCM through computational results by the FEM and TSCM, and experimental results for lattice type structures with harmonic excitation.

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In-Plane Vibration Analysis of General Plates (일반 평판의 면내 진동 해석)

  • Choi, M.S.;Yeo, D.J.;Byun, J.H.;Suh, J.J.;Yang, J.K.
    • Journal of Power System Engineering
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    • v.11 no.4
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    • pp.78-85
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    • 2007
  • In order to analyze accurately the vibration of a structure by using the finite element method (FEM), we have to model a analytical structure as a numerical model with many degrees-of-freedom. However, in this case, the FEM needs much computation time and storage. The authors developed the finite element-transfer stiffness coefficient method (FE-TSCM) for overcoming the drawback of the FEM. In this paper, the authors apply the FE-TSCM to the in-plane vibration analysis of general plates with various shapes. Two numerical examples, a rectangular plate and a triangular plate, are used to compare the results of the FE-TSCM and the FEM. Through the numerical calculation, we confirm that the FE-TSCM can be applied to the in-plane free or forced vibration analysis of the general plates with various shapes and is effective to in-plane vibration analysis of general plates.

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