非平衡ダイナミクスにおけるコンクリート:ポンプ誘起条件付けが非線形コード波干渉測定パラメータに及ぼす影響
Shilan Shaabani1, Pierric Mora1, Parisa Shokouhi2
1GERS-GeoEND, Univ Gustave Eiffel, Bouguenais, CS5004, F-44344, France.
The Journal of the Acoustical Society of America
|January 26, 2026
まとめ
非線形コード波干渉測定(NCWI)は亀裂を検出できるが、その有効性はポンプ処理プロトコルに依存する。この技術を用いた材料のインサイチュモニタリングの精度を高めるには、より長いポンプ時間と一貫した振幅シーケンスが重要である。
科学分野:
- 材料科学
- 非破壊検査
- 超音波工学
背景:
- 線形超音波検査は、タイトな亀裂や微小亀裂の検出に苦労します。
- 非線形コード波干渉測定(NCWI)のような非線形超音波技術は、感度を向上させます。
- NCWIは、高周波コード波と低周波高振幅ポンプを使用して、亀裂関連の速度変化を検出します。
研究 の 目的:
- ポンプ処理プロトコルが、インサイチュ材料モニタリングのためのNCWIの結果に及ぼす影響を調査すること。
- NCWIのためのポンプ源として、動的な稼働中負荷の可能性を探求すること。
- ポンプ処理に対する時間依存的な材料応答の根本的なメカニズムを理解すること。
主な方法:
- NCWIにおけるポンプ時間と振幅シーケンスの体系的な調査。
- 安定した温度および湿度下での健全および亀裂のあるコンクリートブロックに対する制御実験。
- ポンプパラメータの関数としての相対速度変化の分析。
主要な成果:
- より長いポンプ時間は、より大きな相対速度変化と相関し、亀裂の進行的な開口/滑りを示唆しています。
- ポンプ振幅の低下は、より小さな速度変化をもたらし、材料の回復が不完全であることを示しています。
- 損傷したコンクリートブロックでは、健全なブロックと比較して、一貫して高い相対速度変化が観察されました。
結論:
- ポンプ処理プロトコル(期間および振幅履歴を含む)は、NCWIの結果に大きく影響します。
- 時間依存的な材料応答は、NCWIの解釈において重要な要因です。
- 信頼性の高いインサイチュモニタリングには、一貫した最適化されたポンプ処理プロトコルがNCWIで不可欠です。
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