This paper presents an experimental investigation of the dynamics of a custom-designed spindle test system under different operation conditions and at various stages of its service life. Unlike classical modal analysis techniques where known input excitation from hammer strikes are employed to excite the spindle, the presented output-only modal analysis method applies the stochastic subspace identification algorithm to the spindle response measured during its operation such that the modal parameters of the spindle as well as their variation are identified. This method accounts for the structural excitations during the spindle operation, which are not considered if the spindle remains stationary in the experiment. The obtained modal parameters provide insight into structural changes of the spindle during its service life, and can be used as indictor for enhanced spindle condition monitoring.
Proceedings Title: Proceedings of the 8th International Conference on Frontiers of Design and Manufacturing
Conference Dates: September 23-26, 2008
Conference Location: Tianjin, CN
Conference Title: ICFDM 2008
Pub Type: Conferences
Spindle Dynamics, Output-only Modal Analysis, Stochastic Subspace Identification, Condition monitoring