Non-linear system identification in flow-induced vibration
Conference
·
OSTI ID:415064
- Rice Univ., Houston, TX (United States)
- Hudson Engineering Corp., Houston, TX (United States)
The paper introduces a method of identification of non-linear systems encountered in marine engineering applications. The non-linearity is accounted for by a combination of linear subsystems and known zero-memory non-linear transformations; an equivalent linear multi-input-single-output (MISO) system is developed for the identification problem. The unknown transfer functions of the MISO system are identified by assembling a system of linear equations in the frequency domain. This system is solved by performing the Cholesky decomposition of a related matrix. It is shown that the proposed identification method can be interpreted as a {open_quotes}Gram-Schmidt{close_quotes} type of orthogonal decomposition of the input-output quantities of the equivalent MISO system. A numerical example involving the identification of unknown parameters of flow (ocean wave) induced forces on offshore structures elucidates the applicability of the proposed method.
- Research Organization:
- Argonne National Lab., IL (United States)
- DOE Contract Number:
- FG03-95ER14500
- OSTI ID:
- 415064
- Report Number(s):
- CONF-9605186--; ON: DE96015339
- Country of Publication:
- United States
- Language:
- English
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