EXTRACTION METHOD FOR PROPELLER BLADE NUMBER CHARACTERISTIC BASED ON RADIATION NOISE MODULATION

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EXTRACTION METHOD FOR PROPELLER BLADE NUMBER CHARACTERISTIC BASED ON RADIATION NOISE MODULATION

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CHU NING / WANG YUXUAN / TONG WEIQI / ZHONG YAO / WU DAZHUAN / YANG SHUAI / HUANG BIN / WU PENG / CAO LINLIN / QIN SHIJIE / ... [more]

Abstract

To provide a method for extracting characteristic amount information of a propeller axis frequency, a blade frequency, and a propeller blade number by a voice sensor for determining a vessel type in a simple operation.SOLUTION: An extraction method includes: (1) a step of collecting radiation noise signals of a vessel and acquiring a modulation spectrum diagram by Fourier transformation; (2) a step S01 of searching for a local peak in a modulation diagram and acquiring a resonance frequency in a local peak position; (3) a step S02 of determining the resonance frequency in a first local peak in the modulation diagram, determining an axis frequency, and determining the number N of the resonance frequency based on the number of local peaks; (4) a step S03 of determining a multiplication relation between the axis frequency and a blade frequency and determining other resonance frequencies; and (5) a step S04 of determining an average spectrum coherent value for each higher harmonic frequency position, a step S05 of acquiring a propeller blade number by assumption method of naive Bayes, and a step of finally determining the blade frequency.SELECTED DRAWING: Figure 1

【課題】簡単な操作で船舶の種類を判断するために、音声センサによるプロペラの軸周波数、翼周波数およびプロペラ翼数の特徴量情報を抽出する方法を提供する。【解決手段】（１）船舶の輻射ノイズ信号を採集し、フーリエ変換により変調スペクトル図を取得するステップと、（２）変調図にローカルピークを探索し、ローカルピーク位置における共振周波数を取得するステップＳ０１と、（３）変調図における１番目ローカルピークの共振周波数を確定し、軸周波数を確定するとともに、ローカルピークの数に基づいて共振周波数の数Ｎを確定するステップＳ０２と、（４）軸周波数と翼周波数間の逓倍関係を確定し、他の共振周波数を確定するステップＳ０３と、（５）各高調波周波数位置の平均スペクトルコヒーレント値を確定しＳ０４、ナイーブベイズの推断法によりプロペラ翼数を取得するＳ０５、とともに、最後に翼周波数を確定するステップと、を含む。【選択図】図１

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Title :

EXTRACTION METHOD FOR PROPELLER BLADE NUMBER CHARACTERISTIC BASED ON RADIATION NOISE MODULATION

Additional title:

輻射ノイズ変調に基づくプロペラ翼数特徴の抽出方法

Contributors:

CHU NING (author) / WANG YUXUAN (author) / TONG WEIQI (author) / ZHONG YAO (author) / WU DAZHUAN (author) / YANG SHUAI (author) / HUANG BIN (author) / WU PENG (author) / CAO LINLIN (author) / QIN SHIJIE (author)

Publication date :

2021-07-15

Type of media :

Patent

Type of material :

Electronic Resource

Language :

Japanese

Classification :

IPC:

B63B Schiffe oder sonstige Wasserfahrzeuge , SHIPS OR OTHER WATERBORNE VESSELS / B63H Schiffsantrieb oder Steuerung der Schiffe , MARINE PROPULSION OR STEERING / G01R Messen elektrischer Größen , MEASURING ELECTRIC VARIABLES / G06F ELECTRIC DIGITAL DATA PROCESSING , Elektrische digitale Datenverarbeitung / G06M COUNTING MECHANISMS , Zählwerke