ハーモニックウェーブレットの区分利用による時変振動パラメータ推定

Translated title of the contribution: Estimation of Time-Varying Vibration Parameters by the Segmental Use of the Harmonic Wavelet

井上 卓見, 末岡 淳男, 岡沢 伸吾

Research output: Contribution to journalArticlepeer-review

Abstract

Estimation of time-varying vibration parameters, that is, instantaneous damping and frequencies by the wavelet transform is based on the ridge identification and the phase extraction in the time-frequency map. However, there are some problems in easiness to operate the technique. The process of the ridge identification is rather complicated, and the most suitable mother wavelet to yield a time-frequency map for the efficient identification is not determinately chosen. In this paper, we propose a segmental use of the harmonic wavelet in order to estimate the time-varying vibration parameters. The segmental harmonic wavelet is implemented in combination with the Fourier transform, which is utilized to set bounds to frequency range. It shows significantly good results compared with the simple application of the Hilbert transform. The time-varying parameters pertaining to nonlinearities are successfully estimated by the proposed method. A possibility of the proposed method to a diagnosis of a mechanical element is also demonstrated.
Translated title of the contributionEstimation of Time-Varying Vibration Parameters by the Segmental Use of the Harmonic Wavelet
Original languageJapanese
Pages (from-to)1145-1153
Number of pages9
JournalNippon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C
Volume74
Issue number741
DOIs
Publication statusPublished - 2008

Fingerprint Dive into the research topics of 'Estimation of Time-Varying Vibration Parameters by the Segmental Use of the Harmonic Wavelet'. Together they form a unique fingerprint.

Cite this