9-ary tree based self-immunity method for smart sensors

In order to improve the self-immunity capabilities of the IEEE 1451 based smart sensors and enhance the level of sensors´ intelligence, this paper presents a sensors fault detection and repair method based on Auto-Associative Neural Network (AANN). The error sum of squares (SSE) is introduced as a sensor fault evaluation factor on the basis of the inherent nonlinearity & non-orthogonal of the AANN, besides a parallel 9-ary tree algorithm is proposed to locate multi-faulty transducers. The 9-ary tree algorithm can be further extended to estimate the correct value of the faulty transducers while the SSE is less than threshold. A 6-10-2-10-6 structured AANN is constructed to test the self-immunity capability of an insulator contamination status online monitoring networked smart sensor model. Results show that, the AANN can be trained within 2 second. By altering the corrected step of the 9-ary tree algorithm successively; this method can locate at least two faulty transducers synchronously, besides it can take appropriate strategy for recovering the drift failures and estimating their real value within 5 seconds, making the sensors self-immunity.