Rotating machines ( i . e . gear - box ) are always assembly of many associated parts , such as gears and bearings . commonly , high rate of fault isolation for such machines need enough test points . since the machines are always too compact to fix enough sensors , it is significative to study on how to use fewer sensors for machine monitoring and fault diagnosis by vibration analysis of rotating machine groups 复杂的旋转机械往往由轴承、齿轮等大量零件构成,在对这样的设备进行状态监控和故障诊断时,为提高故障隔离率,通常需要为每个零件就近安装传感器,但由于机械结构的紧凑性和性价比的限制,这一点往往难以实现。
In addition , the author also research in general detection optimal algorithm used by fault diagnosis system , these detection optimal algorithm can classify into two types , the first type is that algorithm must be able to find the ptvs ( parallel test vector ) which has the best condensing index p under fault location precision request , these algorithm include woa optimal algorithm , true / compliment optimal algorithm ; the second type is that algorithm must be able to find the ptvs which has the best fault location precision under the condensin index p request . these algorithms include minimum weight value optimal algorithm . but these general detection optimal algorithms have a lot of flaw in test time cost or low fault coverage rate 本文作者还对测试优化算法进行仔细研究，研究结果表明测试优化算法可分为两类，第一类是在满足给定故障定位精度的前提下寻找能够实现最优紧凑性指标p的ptvs (并行测试向量集) ，如true compliment算法；第二类是在满足给定紧凑性指标的前提下寻求能够实现最优故障定位精度的ptvs ，如极小权值优化算法，研究结果还显示这些常规的算法存在测试时间长、故障覆盖率低的缺点。
1963 6 14 . local critics were more civilised in their reviews , though no less critical : one can say it is a comprehensive historical text though the correctness of viewpoint is another matter . both the historical figures and facts are neatly laid out but it lacks the tautness and urgency of modern cinema huo guang , a random discussion of 白景瑞：武则天康城评论坏， 1963 6 14本地评论比外国厚道，却也相当尖锐本片可以说是部很详尽的历史书至于它的观点是否正确是另一回事，人物史实的交代井井有条，但它显然欠缺现代电影的紧凑性和真切感。
