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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Making a comparison between the typical standard of moped running noise testing methods and regulations (in the field of the operation requirements).

对轻便摩托车行驶噪声测量方法的典型标准和法规(在操作要求方面)做出比较。

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Signal processing methods used in ultrasonic testing are reviewed, which cover noise suppressing, QNDE and optimization of driving signal.

文章综合报道了信号处理在超声检测的抑噪、缺陷的定性定量分析及优化驱动信号的几方面应用。

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