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구동식(D. S. Gu),김효중(H. J. Kim),정한얼(H. E. Jeong),김학은(H. E. Kim),최병근(B. K. Choi) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
This paper was shown three equations. Two are the estimation equation of explosion noise, and the other is the decrease equation of the point-soundsource. In the near sea, the explosion works noise of built bridge was reckoned by three equation. And, before construct the bridge, the test explosion had been performed. The estimation noise that reckoned by three equation was compared with the test explosion noise of the built bridge. And the underwater noise that is the explosion works was calculated by the estimation noise. So, in this study, the heavy shock by the explosion works could produce a unfavorable effects to the fish.
구동식(D. S. Gu),정한얼(H. Y. Jung),김효중(H. J. Kim),최병근(B. K. Choi) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
A few intake stations have vibration problems caused by pumps, motors and pipes. The vibration transferred from pumps, motors and pipes excites building severely. Therefore, the crack is generated on building wall and people who work at intake station are damaged. In this paper, the vibration and noise have been measured and analyzed for pumps, motors, pipes and building at intake station. Also, the cause of vibration and noise is identified. Finally, the reference of vibration and noise is established using results of measurement.
구동식(D. S. Gu),이정환(J. H. Lee),김원철(W. C. Kim),최병근(B. K. Choi) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.11
Most of vessels are not evaluated for their vibration and noise effects to human body. The vibration and noise generated by engine and auxiliary machine in vessel is a negative element for seamen. Therefore, in this paper, the diagnosis and evaluation of vibration and noise from vessel is accomplished by a shipbuilding corporation. The vibration and noise transferred from engine room and auxiliary machine was measured during the steady-state operation, and the vibration and noise map of vessel was made. Also, in order to evaluate the ship environment for human, the diagnosis is carried out on the base of measurement results.
김병수(B. S. Kim),구동식(D. S. Gu),임장익(J. I. Lim),배용채(Y. C. Bae),이욱륜(W. R. Lee),김희수(H. S. Kim),최병근(B. G. Choi) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.11
Flywheel energy storage system (FESS) is defined as a high speed rotating flywheel system saving electric power which is a surplus power in normal days. The FESS is proposed as an efficient energy storage system because it has high accumulation energy when it is operated in high speed without mechanical problem It is consisted of flywheel, motor/generator, low friction bearings and so on. To develop a FESS, it has to be passed on the simulation and experiment and those are difficult and take a lot of time. Especially, the simulation is depending on modeling method. In common simulation software using 3D model, the 3D model is designed by rod with point masses for disks to get correct result of rotor dynamics. But, in the FESS, point masses cannot substituted flywheel because of shape. Therefore, in this research, we will propose a easy modeling method using 2D for FESS. Rotor dynamic program for it was coded by Matlab. And the result from 2D model was compared with it from common package software, MSC. Nastran and ANSYS Workbench. And then, modal test had done.
김효중(H. J. Kim),구동식(D. S. Gu),정한얼(H. E. Jeong),김학은(H. E. Kim),최병근(B. K. Choi) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
The reciprocation hydrogen compress has pulsation which is happen noise and vibration. Noise and vibration that happen by pulsation have bed effect machine and working environment. So, must know vibration special quality of compress to decrease these noise and vibration. but each machine have a different of vibration special quality. So, standard is needed for assessment of the vibration special quality. In this paper, a study is achieved about ISO, VDI and KS standard to assess the vibration of reciprocating type compressor. The hydrogen compressor is measure and diagnosis base on the VDI 3838 in this paper.
김효중(H J Kim),구동식(D S Gu),정한얼(H Y Jung),최병근(B K Choi) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
The reciprocation hydrogen compress has pulsation which is happen noise and vibration. Noise and vibration that happen by pulsation have bed effect machine and working environment. So, must know vibration special quality of compress to decrease these noise and vibration, executed analysis using nastran that is common use program. Find and compared each mode shape when consider Crank case analysis and consider Crank case and cylinder together through free vibration. And to search rejoinder about shock by Crank easel s pulsation 0 ~ 100 ㎐ because do sweep forced oscillation analysis achieve.
교각 차량 통행에 의한 소음이 환경에 미치는 영향 평가
정한얼(H. E. Jeong),구동식(D. S. Gu),김효중(H. J. Kim),김학은(H. E. Kim),최병근(Choi B. K) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
The interesting of environment is recently increasing. the word about environment problem is not hard hearing by mass media, so the environment problem is big problem which is industry of today. The entire nation are into a one-day life zone to the tunnels and bridges construct increased by traffic network, but there are environment problem for increasing noise by vehicle traffic. therefor, in this research, the nuder water noise and air noise cause by traffic on the bridge are compared and analyzed by each measurement point.
이정환(J. H. Lee),구동식(D. S. Gu),최병근(B. K. Choi) 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-
A few intake stations have vibration problems caused by pipes. The vibration transffered from pipes excites building severely. Therefore, the crack is generated on building wall and people who work at intake station are damaged. In this paper, the vibration is measured and analysis is carried out for pipes at intake station in order to identify the usefulness and effectiveness of the solution proposed for pipe resonance avoidance. According to the result of analysis, the vibration of pipes is reduced by bellows.