Patent ID: 7756649

Claim:
A method for fault detection and diagnosis of a rotary machine comprising the following steps: (a) rotating a rotor having an imbalance is rotated at a rotational speed to excite vibrations in the rotary machine due to an imbalance-caused force; (b) measuring the rotational speed of the rotor and the vibrations in order to obtain input data quantitative for the rotational speed and the vibrations; (c) forming an over-determined set of linear equations containing input and output data of a process of dynamic behavior of the rotary machine and unknown states of an assumed linear system for the process in an unfaulty state; (d) extracting a number of states needed to accurately model the process in the unfaulty state by using mathematical operations to form a matrix having a rank equal to the assumed linear system; and (e) using Singular Value Decomposition to compute singular values for obtaining an approximate indication of an order of the assumed linear system.