There exists a lot of uncertainty and redundant knowledge in machinery fault diagnosis, while rough set theory is a new mathematical tool to deal with uncertain information.
机械故障诊断中存在着许多不确定性和知识冗余性，而粗糙集理论是一种新型的处理不确定性信息的数学工具，粗糙集理论提供了对机械故障进行诊断全新的有效途径。
Rough sets theory is a new mathematical tool to deal with vagueness and uncertain, which can remove redundant information and seek for reduced decision tables effectively.
粗糙集理论是一种新型的处理模糊和不确定知识的数学工具，它能在保持信息系统分类能力不变的前提下，有效地进行知识约简；
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