Hailei Jiang

Oscillation Diagnosis using Adjacency Matrix

Oscillations are a common type of plant-wide disturbance whose effects propagate to many units and thus may impact the overall process performance. It is important to detect and diagnose the oscillations early in order to rectify the situation. Many frequency domain methods such as power spectrum, spectrum envelope are capable of detecting the oscillation frequency. However, few methods are available for locating root cause which is the main objective of oscillation diagnosis. This presentation proposes a new method to diagnose the root cause of plant-wide oscillations using adjacency matrix. A distinguished feature of the new method is that it is NOT data-based and it can be carried out without using any data. Combination of the new method and other data-based methods can provide powerful diagnosis of plant-wide oscillations. Two industrial case studies are presented to demonstrate the applicability of the proposed method.

Hailei Jiang is doig his PhD in Chemical Engineering under the supervision of Dr. Sirish Shah and Dr Biao Huang.