... Flat-bottomed hole equivalent 平底孔当量 Flat-bottomed hole 平底孔 Flaw characterization 伤特性 缺陷特征 ...
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... 声程长度sound path length 平底孔flat bottom hole 间接扫查技能indirect scan technique ...
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... 孔深度/直径比率（Hole Depth/Diameter Ratio）： 平底孔(Holes with Flat Bottom)： 孔入口／出口曲面(Hole Entry/Exit Surface)： ...
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采用短横孔人工缺陷和平底孔人工缺陷的当量标定或用大平底当量计算法。
Equivalent calibrations of short horizontal hole artificially defects and big flat-bottomed hole artificially defects or calculation equivalent of big flat-bottom are adopted.
通过与平底孔试块实际缺陷回波信号的对比，验证了脉冲超声波有限差分法模拟计算的有效性和正确性。
Validity and feasibility of the finite difference time domain method is demonstrated by the echo-wave signal of a flat bottom hole block.
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