http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
한국형 고속철도 차량의 운행조건에 따른 차내 소음 분석
최성훈(Choi Sunghoon),김재철(Kim Jae-Chul),이찬우(Lee Chan-Woo),문경호(Moon Kyung-Ho) 한국철도학회 2003 한국철도학회 학술발표대회논문집 Vol.- No.-
The conditions for measurement of the interior noise should meet the international standards. However, due to the limitations in test conditions the possible errors in measurement equipment, reliability of the measurement results has been questioned. Hence, the test procedure for the interior noise measurement of KTX vehicles are reviewed and investigated with the reference of international standards. Furthermore, the acceptable tolerance is inspected through the analysis of the factors that influence the interior noise of the KTX vehicle.
최성훈(Choi Sunghoon),박춘수(Park Choon-Soo),이태형(Lee Tae-Hyung) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
The first task for the development of a train system is to define the system and to determine its requirements. Reliability target is one of the requirements defined in the system requirements. In railway applications it is advised to follow the procedures given in IEC 62278 to fulfill reliability requirements. The reliability requirements are derived from the customer"s needs. The way in which the system requirements reflect the customer"s needs is strongly dependent on the characteristics of the product. In general the customer of commercial trains presents the system requirements from their needs. However, the relation between the customer and supplier is equivocal for a project to development a prototype train, and the reliability program should be different from that of an usual commercial project. This paper deals with the reliability management and assessment plan carried out for the on-going "Next generation high-speed train development project".
고속열차의 차간 공간에서 발생하는 소음 특성의 시험적 규명
최성훈(Sunghoon Choi),박춘수(Choon Soo Park),박준홍(Junhong Park),김상수(Sang Soo Kim) 한국철도학회 2007 한국철도학회논문집 Vol.10 No.6
고속열차의 속도가 300㎞/h 이상이 되면 난류의 박리나 와류발산 등에 의한 공력소음의 영향이 지배적이 된다. 본 연구에서는 KTX와 한국형고속열차의 외부에서 발생하는 공력소음, 특히 차간 공간에서 발생하는 소음의 특성을 시험을 통해 규명한다. 차량 실내외의 소음 측정을 통해 이 소음의 특성을 분석하였고, 풍동시험을 통해 머드플랩 사이의 틈의 크기가 저주파 소음 발생에 직접적인 영향을 준다는 것을 규명하였다. 또한 마이크로폰어에이 시험으로 고속열차의 외부에서 발생하는 소음의 주파수 특성을 분석하였다. Aerodynamically generated noise is dominant when the train speed approaches 300㎞/h. This noise sources is caused by the turbulent flow separations or vortex shedding from the train structure. Experiments were performed to investigate the characteristics of aerodynamic noise sources generated from exterior of the KTX trains and HSR-350x, especially from the inter-coach spacing. Measurements of both the inside and outside of the cabin are carried out to investigate the characteristics of the noise. Effect of the size of the mud-flap has been investigated through an wind tunnel test and it has been found that the low frequency noise is strongly dependent on the size of the gap. Also performed is an array measurement to locate different noise sources from the high-speed train. spectral characteristics of exterior noise sources are examined.
양극파형의 펄스폭 변화에 따른 피에조 구동형 잉크젯 노즐의 액적 토출 특성
최성훈(Sunghoon Choi),성재용(Jaeyong Sung),이명호(Myeong Ho Lee) 한국가시화정보학회 2012 한국가시화정보학회지 Vol.10 No.1
In this study, a piezoelectric inkjet nozzle with a rectangular shaped channel has been developed, and the characteristics of droplet formation have been investigated according to the variation of pulse widths in bipolar waveform. The channel of the nozzle was fabricated transparently by a precision machining technique. A tantalum membrane which was attached to a piezoelectric material covers the channel. By applying two types of bipolar waveforms to the piezoelectric actuators, droplet formation through the nozzle was monitored by a CCD camera. For the variety of the first and second pulse widths in the bipolar waveforms, the regimes of single and double droplet formations are presented. The change of droplet velocity which depends on the pulse width and the type of waveform is also discussed.