Instantaneous correlation analysis by the wavelet obtained from measurement and its application to the active noise control

概要

論文の詳細を見る
Recently, many researches on time-frequency analysis using wavelet transform have been focused on analyzing wavelets that are derived from a mathematical approach. In the analysis of this study, measured signal is adopted as the wavelet. Applying the proposed system, the correlation between acoustic and vibration signals from a wall and a floor in a mess hall, which is adjacent to an engine room of the training ship, is analyzed. As the traditional calculation of correlation repeats averaging procedure, the original signal must be stationary. To apply the method to time-varying signals, a new concept of instantaneous correlation factor, ICF, is introduced. As a conclusion, it is proved that a dominant feature of the correlation can be estimated by the ICF. The time-varying correlation could be analyzed and the starting point of main engine deceleration can be detected accurately. We also confirmed that this method allows for selection of reference signals to meet the active control.
大島商船高等専門学校の論文