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이욱륜(Lee Wook-Ryun),김희수(Kim Hee-Soo),김동환(Kim Dong-Whan),배용채(Bae Yong-Chae) 한국소음진동공학회 2014 한국소음진동공학회 학술대회논문집 Vol.2014 No.10
In this paper, I summarize the case for the noise emission of domestic power plants and foreign power plants occurred recently. It is described to main content that is analyzing of the noise source and looking at the noise generated, if necessary to derive the solution. In addition, a case study is shown based on that noise levels can be changed by the differently surrounding environmental conditions during the measurement noise.
이욱륜(Wook-Ryun Lee),배용채(Yong-Chae Bae),김희수(Hee-Soo Kim),김봉수(Bong-Soo Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Nowadays, higher income and improved lifestyle has lead to more interest in the surroundings. As a result, environmental issues are being raised, especially noise problems. In this study, among noise problems, optimization of noise measurement from substations and its facilities located near residential areas, and also measuring methods and the development of noise measuring devices using these methods are presented. Currently, the number of submitted civil petitions pertaining to noise from substations are rising steadily every year, and accurate measurements are required as basic data. Therefore, the use of conventional sound levelmeters is not suitable for the accurate measurement of noise originating from the substation alone, since there is a large difference in noise measurement due to the variation of noise from the background. This study presents the optimal method for measurement of noise originating from only the transformer, by applying a method for extracting noise from the transformer itself while minimizing surrounding noise using frequency analysis method, among various signal analysis methods.
유승열,이욱륜,배용채,노명규 대한기계학회 2010 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.24 No.1
The stability of flywheels in an energy storage system supported by active magnetic bearings (AMBs) is studied in this paper. We designed and built two flywheel energy storage systems (FESS) that can store up to 5 kWh of usable energy at a maximum speed of 18,000rpm. One is optimized to store as much energy as possible, resulting in a flywheel with a strong gyroscopic coupling. The other has a much smaller gyroscopic coupling for ease of control. To analyze the stability of the system accurately, we derived the dynamic models of the rotor using finite-element method and integrated them with the models of the bearings, amplifiers, and sensors to obtain the simulation model of the system. We validated the model through experiments and compared the stability of these two systems.