Abnormality detector
专利汇可以提供Abnormality detector专利检索，专利查询，专利分析的服务。并且PURPOSE:To detect abnormality of a device by approximating measured values by a stepwise approximate function and finding a smoothed value, estimating a low frequency noise by an autoregression model, and comparing the deviation between the squares of the both and the square of theintegral signal of the smoothed value with an approximate error. CONSTITUTION:A measurement signal (x) from an oscillation accelerometer fitted to a generating device is converted into a digital signal xk by an AD converter 2 at every period, and the signal is stored and updated in a data buffer 3 and sent to a fast Haar converter 4. A deciding device 5 for the number of stages selects and inputs a subsequence of Haar spectra with a permissible error inputs epsilon to a fast reverse Haar converter 6 together with an exponent (m) indicating its degree M. The reverse converter 6 calculates and outputs smoothed values Yk and Yk-1 of the measurement signal, a noise estimating device 7 output variation in square deviation signal Zk, i.e. estimated signal fk of a low-frequency noise on the basis of the autoregression model, and a calculating device 8 calculates the square deviation signal Zk of the both. A deciding device 10 compares a signal from a differentiating filter 9 and said signal Zk with the variance sigma of a noise component to decide on whether an abnormal signal is present or not.，下面是Abnormality detector专利的具体信息内容。
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