And the negative pressure wave signals are multi-resolution analyzed to obtain its low-frequency profile and high-frequency details.
利用小波变换的快速算法(Mallat算法)对泄漏负压波信号进行了多分辨率分析，同时得到了其低频概貌和高频细节。
参考来源 - 输油管道泄漏实时监测报警系统的研究与开发·2,447,543篇论文数据，部分数据来源于NoteExpress
The negative pressure wave method was proposed for a pipeline leak detection system.
采用负压波法检测管线泄漏信号。
When there is a leak point in the pipeline, the pressure is fallen and the negative pressure wave occurs at once.
当管道某处突然发生泄漏时，泄漏处将出现瞬态压力突降，形成一个负压波，并以一定的速度向管道上、下游两端传播。
Several leak diagnosis methods such as instantaneous negative pressure wave, flow-lack, and hybrid diagnostic method were used.
采用了瞬态负压波法、流量输差法和压力流量综合法等多种泄漏诊断方法。
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