Method and apparatus of multi-axis resonance fatigue test
AssigneeKorea Institute of Machinery & Materials
InventorsHakgu LEE, Byungsun HWANG, Wookyoung LEE, Mungyu JEONG
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Abstract
A multi-axis resonance fatigue test method and apparatus are provided by considering both stiffness coupling and inertia coupling in a resonance fatigue test that causes a complicated behavior and nonsymmetrical bending of a test article such as a wind turbine blade due to a coupling effect. In the method, a processor of the apparatus calculates a load value by considering a coupling between at least two axes of the test article. Also, the processor determines respective single-axis equivalent loads from the calculated load value by considering the coupling. This coupling may include at least one of a stiffness coupling and an inertia coupling.
Claims14
A multi-axis resonance fatigue test method for a test article, the method comprising steps of:
- calculating a load value by considering a coupling between at least two axes of the test article;
- and
- determining respective single-axis equivalent loads from the calculated load value by considering the coupling.
A multi-axis resonance fatigue test apparatus for a test article, the apparatus comprising:
- a test stand configured to fix one end of the test article;
- an exciter mounted on the test article and configured to apply a repeated force to the test article so as to induce oscillation;
- a controller connected to the exciter and configured to apply a driving force to the exciter;
- and
- a processor configured to calculate a load value by considering a coupling between at least two axes of the test article, and to determine respective single-axis equivalent loads from the calculated load value by considering the coupling.
Dependencies are inferred from the claim text.