A hydraulic impact machine is a special machinery, its main output working parameters are impact energy and impact frequency.

液压冲击机械是一类特殊的机械设备，其性能参数的数据采集和测试系统的设计一直是各国学者的研究热点。

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The existing air punch can achieve the expected construction work, but it is necessary to improve its performance such as air consume and impact frequency.

现有的气动穿孔机已能完成预期的施工任务，但其耗气量和冲击频率等性能参数还有待于进一步的提高。

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Based on the analytic method of cyclic spectrum density, the paper pointed out that the impact frequency could be extracted effectively with the help of scanning cyclic frequency domain.

通过对循环谱密度分析方法的特性分析，指出应用循环谱密度分析方法可以在循环频率域有效提取出滚动轴承的冲击故障频率。

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The burden would fall mostly on high frequency traders while having minimal impact on long-term investors such as pension funds.

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Ranger IV was also equipped with a seismometer and radio transmitter, designed to be released in a small capsule from the rocket before impact and land on the Moon in sufficiently good condition to measure the frequency of natural earthquakes in the body of the Moon.

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So the operational impact of any engine-related grounding is decreased by having competing engines, but the frequency of engine-related groundings is probably increased.

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