지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록· 키워드
오류제보하기
The time-frequency analysis method Hilbert-Huang Transform (HHT) is applied in the signal processing for metro vehicle, in order to analyze and research the reason of abnormal vibration of carbody floor. The linear superposition property and the actual physical meaning of marginal spectrum are demonstrated to assess the vibration characteristic of structure. The rail vehicle is a nonlinear system and unsteady process. All kinds of frequency domain analysis method based on Fourier Transform is short to study on the un-linear and unsteady system, cannot use it to search the abnormal vibration reason. HHT is an effective tool to research the nonlinear and unsteady process, describing the vibration amplitude changing process with time and frequency. Compared to the test results and considered that the abnormal vibration frequency come from the two times frequency components about the traction motor rotating speed which is transferred to the floor through the vehicle suspension system. The frequency is close to the natural frequency of local floor and stimulates local elastic vibration of the floor significantly. At last, the paper pointed that the frequency component maybe caused by the misalignment of flexible-coupling.
목차
Abstract
1. INTRODUCTION
2. TIME-REQUENCY ANALYSIS METHOD: HILBERTHUANG TRANSFORM
3. TEST DATA PROCESS AND ANALYSIS
4. CONCLUSIONS
REFERENCE
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UCI(KEPA) : I410-ECN-0101-2015-320-001328692