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Method and apparatus for diagnosing a damage in a structure UPDATE

外国特許コード F120007027
掲載日 2012年11月19日
出願国 アメリカ合衆国
出願番号 86697409
公報番号 20100319452
公報番号 8371170
出願日 平成21年2月12日(2009.2.12)
公報発行日 平成22年12月23日(2010.12.23)
公報発行日 平成25年2月12日(2013.2.12)
国際出願番号 JP2009052311
国際公開番号 WO2009101978
国際出願日 平成21年2月12日(2009.2.12)
国際公開日 平成21年8月20日(2009.8.20)
優先権データ
  • 特願2008-032142 (2008.2.13) JP
  • 2009WO-JP52311 (2009.2.12) WO
発明の名称 (英語) Method and apparatus for diagnosing a damage in a structure UPDATE
発明の概要(英語) (US8371170)
In the diagnosis of a structure, at least one electromechanical transducer is fixed to a structure as an object of diagnosis and is driven with an alternating voltage of a constant amplitude, and a current flowing through the at least one electromechanical transducer is measured.
Next, high frequency components around a driving frequency of the electromechanical transducer are separated from a signal of the current.
Next, modulation information due to a damage is extracted from amplitude and/or phase demodulation of the high frequency components.
Then a damage index is evaluated based on the modulation information.
Thus, structural health can be diagnosed with use of at least one electromechanical transducer, without baseline data, in one measurement.
特許請求の範囲(英語) [claim1]
1. A method for diagnosing a structure comprising: driving at least one electromechanical transducer fixed to a structure as an object of diagnosis with an alternating voltage of a constant amplitude, and measuring a current flowing through the at least one electromechanical transducer,
separating high frequency components around a driving frequency of the electromechanical transducer from a signal of the current,
extracting modulation information due to a damage from amplitude demodulation of the high frequency components, and
evaluating a damage index based on the modulation information.
[claim2]
2. The method according to claim 1, wherein the damage index is a ratio of amplitude of a current waveform after the demodulation to an average of the current waveform after the demodulation, and the ratio is compared with a threshold value to diagnose occurrence of a damage.
[claim3]
3. A diagnosis apparatus comprising: a separator for separating high frequency components around a driving frequency of at least one electromechanical transducer from a signal of a current flowing through the at least one electromechanical transducer when the transducer fixed to a structure as an object of diagnosis is driven with an alternating voltage of a constant amplitude,
an extractor for extracting modulation information due to a damage from amplitude demodulation of the high frequency components, and
an evaluator for evaluating a damage index based on the modulation information.
[claim4]
4. A diagnosis method comprising: driving at least one electromechanical transducer fixed to a structure as an object of diagnosis with an alternating voltage of a constant amplitude, and measuring a current flowing through the at least one electromechanical transducer,
separating high frequency components around a driving frequency of the electromechanical transducer from a signal of the current,
extracting modulation information due to a damage from phase demodulation of the high frequency components, and
evaluating a damage index based on the modulation information.
[claim5]
5. The method according to claim 4, wherein the damage index is a ratio of amplitude of a current waveform after the demodulation to an average of the current waveform after the demodulation, and the ratio is compared with a threshold value to diagnose occurrence of a damage.
[claim6]
6. The method according to claim 4, further comprising: extracting the modulation information due to the damage with amplitude demodulation of the high frequency components,
wherein the damage index is evaluated from the modulation information after the phase demodulation and the modulation information after the amplitude demodulation.
[claim7]
7. An diagnosis apparatus comprising: a separator for separating high frequency components around a driving frequency of an at least one electromechanical transducer from a signal of a current flowing through the at least one electromechanical transducer when the transducer fixed to a structure as an object of diagnosis is driven with an alternating voltage of a constant amplitude,
an extractor for extracting modulation information due to a damage from phase demodulation of the high frequency components, and
an evaluator for evaluating a damage index based on the modulation information.
[claim8]
8. The diagnosis apparatus according to claim 7, wherein the extractor further extracts modulation information due to the damage with amplitude demodulation of the high frequency components, and the evaluator evaluates the damage index from the modulation information after phase demodulation and the modulation information after amplitude demodulation.
  • 発明者/出願人(英語)
  • MASUDA ARATA
  • KYOTO INSTITUTE OF TECHNOLOGY
国際特許分類(IPC)
米国特許分類/主・副
  • G01M005/00M
  • G01M005/00P
  • G01N029/14
  • G01N029/42
  • G01N029/44B2
  • G01N029/44F
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