| 摘要 |
PURPOSE:To perform a non-destructive inspection of an equipment accurately, by a pattern matching between a reference pattern obtained by analyzing a normal sound of the equipment and an input pattern. CONSTITUTION:A signal converted from an equipment sound with an equipment sound input section 10 is converted to an input pattern A as time series of a feature vector via a frequency analysis with an analysis section 20 to be held into buffer 30. In the learning mode, a pattern matching section 50 performs a pattern matching between the input pattern A and a reference pattern B<n> from a reference pattern memory 40. Then, the minimum of the distance value is sent to a decision section 70 for each category to be registered as reference pattern. In the monitor mode, a decision section 80 determines whether it is normal or abnormal from the minimum of each distance value by a pattern matching between the input pattern A and the reference pattern B<n>. Thus, non-destructive inspection can be done accurately and automatically. |
