• The Journal of the Acoustical Society of Korea
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• v.40 no.4
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• pp.278-289
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• 2021

In this study, the acoustic performance of a dissipative silencer used in the ship with excellent performance compared to its size was predicted and analyzed using a numerical analysis method to reduce the pipe noise. To this end, the performance of the single expansion chamber-shaped silencer was verified using experimental and numerical analysis methods. The acoustic performance of the silencer was expressed using the Transmission Loss (TL), an indicator of its own performance, and the result was derived using the two-load method, which measured by changing the impedance at the end of the pipe. For the numerical analysis method, a general-purpose finite element analysis program was used, and the Delany-Bazley-Miki model with the flow resistivity of the sound absorbing material as an input parameter was applied. Finally, we compared the experimental and simulated results for each of the acoustic performances of the single expansion type and the dissipative silencer to confirm the consistency of the results, and predicted and analyzed the simulation results for four cases according to the properties of the sound absorbing material.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 1993.04a
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• pp.71-74
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• 1993

The purpose of this paper is that the compressor design engineers reduce a development term with CAE approach. By using CAE, geometries for various type of piping systems can be constructed interactively and the Vibration Characteristics and Stress distribution are analyzed by FEM. Sensitivity and structural modification analysis capability are also used to reduce the total number of prototypes. An example is shown to validate the effectiveness of this system.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2004.05a
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• pp.263-266
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• 2004

In this paper, Firstly, it is shown that the high vibration source of piping and pump system is the Resonanse of pump and piping system. Secondly, in order to decrese the high vibration of pump and piping system, some practical Friction damper with high damping have been developed and its effectiveness is investigated as installing it at piping system practically.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2011.04a
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• pp.679-680
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• 2011

The Forced vibration characteristics of elastically restrained pipe conveying fluid with the attached mass are investigated in this paper. Based on the Euler-Bernoulli beam theory, the equation of motion is derived by using Hamilton's principle. The effect of attached mass and spring constant on forced vibration of pipe system is studied. Also, the critical flow velocities and stability maps of the valve-pipe system are obtained as each parameters.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2014.10a
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• pp.323-327
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• 2014

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 1997.04a
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• pp.128-132
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• 1997

This paper deals with the optimization of pipe-support allocation using the genetic algorithm, and shows the feasibility of the optimization method to actual design problems and also the convergence characteristics of optimization calculation with respect to the various seismic waves. The piping system was modeled as mass-spring system with 5 degrees of freedom and the support was as spring-damper. The support allocation problem was formulated to minimize the response of the piping system to seismic excitation.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2003.05a
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• pp.1070-1072
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• 2003

In this paper, Firstly, it is shown that the high vibration source of piping system is the pulsation transmission of pipe line element ,such as, orifice plate, valves and the control valve is a broad band source and the branch wall and the cavity have vortex frequency Secondly, in order to decrese the turbulence vibration of piping system, the practical analysis of piping flow by EFD have been developed and its effectiveness is investigated as applying it at piping system practically.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.32 no.10
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• pp.22-26
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• 2003

근린생활시설 천정에 오$.$배수 수평주관이 위치하여 배수시에 소음$.$진동에 의한 환경 피해를 최소화한 시공 사례에 대해 소개하고자 한다. 최근의 건축물은 지가 부담의 기준으로 가급적 최소한의 대지에 최대한의 고층으로 건설하려는 경향이 뚜렷하다. 본고의 대상건축물의 경우도 예외는 아니어서 한정된 대지에 대한 용적율이 허용하는 최고층을 계획하다 보니, 배관전용 공간으로써의 중층(mezzanine)을 두지 못하고 부득이 근린생활시설(2층)의 천정에 오$.$배수 수평주관을 설치하도록 설계되었다.(중략)

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2013.10a
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• pp.868-869
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• 2013

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2000.11a
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• pp.145-149
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• 2000

In this paper, Firstly, it is shown that the bending mode vibration of check valve is comparatively large because resonance. Secondly in order to decrese the bending mode vibration of check valve, some practical dynamic vibration absorber have been developed and its effectiveness is investigated as installing it at the check valve of piping system practically.