| 摘要 |
<p>PURPOSE:To detect the abnormality of the titled sewage treating system and to display its cause by calculating the degree of influence of water quality items on other items from an autoregressive model, and detecting the abnormality of the present values in order from the most influential item. CONSTITUTION:10-26 water quality items including the amt. of influence sewage. the pH of influent water, the concn. of organic materials, etc. are measured, and the measured values are used as system variables. The conditions of the process are estimated from the detected signals of said measuring devices 10-26, and the coefficients of a statistical autoregressive model are calculated by an arithmetic unit 27 of coefficients. The degree of influence on a certain system variable among said variables is calculated from said autoregressive model, and the standard deviation is also calculated. The abnormality in the present value of the system variable is detected by using said standard deviation, and displayed.</p> |
