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在介绍应用于液压驱动的非开挖地下穿孔机的主要部件──高功率密度液压冲击器的工作原理基础上，介绍了高功率密度液压冲击器输出性能参数的确定．
Based on the introduction of the working principle of high power density hydraulic impactor, which is the main part of hydraulic driven trenchless underground perforator, the output performance parameters of high power density hydraulic impactor are introduced.