In this paper several dynamic testing methods of electrohydraulic servo systems are introduced, including stochastic noise test, hammering test and sweep frequency test.

本文介绍电液伺服系统的几种动态测试方法，包括随机噪声测试，锤击法测试和扫频测试。

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Do the South Africans feel unsettled, or is it that he has revenge on his mind for the hammering England handed out two summers ago when Arthur's team became distracted following the Test series?

BBC: Jonathan Agnew column