It does this by fitting small piezoelectric acoustic sensors to parts of the structure to detect the particular frequency of noise caused by a crack in aircraft-grade aluminium.
把小型压电声传感器安装到这种构造部位上，检测由航空级铝材裂纹所致的特定频率的噪音，靠这样就能监测飞机裂纹。
The cause inducing noise pollution on high grade road, and the noise abatement measures both at home and abroad are introduced. A way to precaution noise given.
介绍了高等级公路噪声污染产生的原因，介绍了国内、外降噪的主要措施，同时提出了防噪声方式。
The cause inducing noise pollution on high grade road, and the noise abatement measures both at home and abroad are introduced. A way to precaution noise given.
介绍了高等级公路噪声污染产生的原因，介绍了国内、外降噪的主要措施，同时提出了防噪声方式。
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