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Anti-Vibration Pad의 실험, 해석 및 설계 방법 확립
이장명 울산대학교 기계부품 및 소재 특성평가연구센터 1999 연구보고서 Vol.1999 No.-
자동차의 Floor에 부착되는 제진재(Anti-Vibration Pad)는 차제의 진동을 저감하고 차량의 실내 소음을 줄이는데 하는데 중요한 기능을 하는 부품이다. 따라서 적절한 위치에 적합한 제진재의 사용은 최적의 NVH 성능을 얻기 위해 필요하며 경량화와 원가 절감에도 영향을 준다.그러므로 보다 나은 성능의 제진재를 설계하기 위해서는 Foolr에 부착되어진 제진재의 제진 성능 해석과 시험 기술의 확립은 필수적이다. 그 첫 단계로 Beam울 이용하여 여러 온도 조건에서 손실 계수(Loss factor)을 측정하는 방법을 확립하고, 유한요소법(FEM)과 경제요소법(BEM)을 이용하여 평판의 진동에 의해 방사되는 소음을 해석하는 방법에 대해 연구하였다. The damping sheet called an anti-vibration pad acts an important role in reducing the vibration level of the floor of an automobile. During applying the damping sheet to the floor, decision of the optimized location and appropriate material of the damping sheet is a main aspect considering several design variables such as cost, performance and weight of it. Therefore establishment of the analysis ability and the test skill of the damping sheet to the floor is essential for the better design of it. As a first step of this research, to find the loss factor of it, the methodology of the test scheme has been introduced using specimens of beam for various temperature environment. And the fundamental analysis technique has been studied for the radiation of a panel with the help of the Finite Element Method and the Boundary Element Method.
이장명 釜山工業大學校 1986 論文集 Vol.28 No.2
The modern world is turning from traditional musical instrument to the more versatile digital synthesizers. The expressive power of these instruments however, is hardly tapped, as the means to control and interface them together is still not fully developed. What has been developed however, is sufficient to show us that we are but scratching at the tip of the iceberg; as people are coming to realize the immense capabilities of such machines, the de-mand for more and more sophisticated means of linking them together efficiently is rising. The introduction of the MIDI, the now de facto industry standard, was a step by manufacture-ers to exploit this vast and growing market. We present here a MIDI Interface Board designed to interface a personal computer to a MIDI environment, facilitating real time editing and sequencing of digital musical instru-ments. The MIDI Interface Board buffers data to and from the host computer and the external MIDI environment. It permits operations to be performed on the data in real time, under user specification. This permits real time editing, sequencing and control of devices attached to the MIDI interface.
이장명,한성수 한국소음진동공학회 2001 소음 진동 Vol.11 No.1
Recently, the porous duct is becoming one of Possible ways to reduce the intake noise of an automobile instead of using resonators. In this article, acoustic characteristic of the porous duct is investigated theoretically and experimently. Futhermore, 4-pole parameter of the porous duct is introduced to predict transmission loss of it for various case. Acoustic efficiency of the porous duct is shown with experimental result using a car.
Hazardous Area Navigation with Temporary Beacons
이장명,엄위섭,박재현 제어·로봇·시스템학회 2010 International Journal of Control, Automation, and Vol.8 No.5
A new area expansion algorithm for the localization scheme, using temporary beacons, is proposed in this paper. The effective area of the active beacons is limited by the strength of the ultrasonic signals in a noisy environment. When a mobile robot needs to move into a hazardous area or into an unstructured environment where the beacons with pre-specified position information are not available, the localization may solely rely on dead reckoning sensors such as encoders. To overcome the error accumulation by using dead-reckoning, a new scheme is developed, in this paper, in which the mobile robot carries a few temporary beacons which do not have any pre-stored position information. When the mobile robot encounters a dangerous or unstructured environment, it utilizes the temporary beacons to localize itself. An auto-calibration algorithm has been developed to provide the position in-formation to the temporary beacons before they are used for the localization. With these temporary beacons and the auto-calibration algorithm, mobile robots can safely pass unstructured areas. The ef-fectiveness of the temporary beacons and auto-calibration algorithm is verified through real experi-ments of mobile robot navigation.