http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
회전익 항공기 기어박스 상태감시진단을 위한 음향신호 잡음제거 방법에 관한 연구
안병현(Byung Hyun Ahn),김효중(HyoJung Kim),박선휘(Sunwhi Park),김용석(YongSeok Kim),최병근(ByeongKeun Choi) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.4
Gearboxes are very important for many industrial applications such as wind turbine, power generators and rotorcraft gearboxes. Most of all, this research is focused on rotorcraft gearboxes and condition monitoring & diagnosis system. the purpose of health and usage monitoring(HUM) is to improve flight safety, rotorcraft availability, maintainability, the ability to complete a transmission, and to reduce life cycle costs. Acoustic Emission technique is widely applied to develop the early fault detection system for predictive maintenance, and the problem is about a signal processing method for AE signal mainly focused on. but AE frequency is usually in the range of 150-300 kHz which means it has huge modulated data in signal. it has a advantage of early fault detection but also predictive maintenance while a variety of irrelevant data reduces the performance of condition indicators. that is typically noise from the rotorcraft transmissions and bearings. In this paper, Advanced research is performed by noise reduction techniques in time domain and frequency domain by using AE signal from the motor gearbox. In order to study on rotorcraft gearboxes for condition monitoring and diagnosis.
정한얼(HanEol Joeng),김효중(HyoJung Kim),구동식(DongSik Gu),김학은(Hak Eun Kim),최병근(ByeongKeun Chio) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Recently, demands for the reduction of noise generated by transformers have been increasing. Accordingly the noise of transformer occasion displeasing to residents therefore the transformer needs to decrease of noise. One method of reduction such a noise is to build a free-standing enclosure of concrete and steel plates around the transformer. however, this method has some disadvantages, for example, a lage area is needed for equipment installation. In the paper, the vibration and noise effect which is transferred from reinforce channel to insulation panel generated by transformer have been identified for the several kinds of insulation panel and damping sheet experimentally.
Reed Frequency 회피를 위한 수직펌프의 최적 구조설계
임장익(JangIk Lim),최병근(ByeongKeun Choi),김효중(HyoJung Kim),박철현(ChulHyun Park) 한국마린엔지니어링학회 2009 한국마린엔지니어링학회 학술대회 논문집 Vol.2009 No.-
The reed frequency that occurred during the motor operation in vertical cargo pump is important factor to control the limitation of operation speed. if the reed frequency has no consideration for motor in vertical cargo pump design, it may be impossible to design the operation design of vertical cargo pump. therefore, in this paper, the optimization design of pump has done with common analysis programs to avoid the reed frequency resonance. and then the results are compared and analyzed.