Evaluation of free interface-based reduction techniques for nonlinear forced response analysis of shrouded blades
| Autor: | Stefano Zucca, Fahimeh Mashayekhi, A.S. Nobari |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Turbine blade
dual Computer science 020209 energy friction Mechanical engineering 02 engineering and technology 01 natural sciences law.invention contact interface law 0103 physical sciences Turbomachinery 0202 electrical engineering electronic engineering information engineering Model order reduction nonlinear forced response shrouded blade 010301 acoustics Mechanical Engineering Response analysis Nonlinear system Response level Free interface Reduction (mathematics) |
| Zdroj: | Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science. 233:7459-7475 |
| ISSN: | 2041-2983 0954-4062 |
| Popis: | The efficient dynamic stress assessment of turbine blades is of prime importance in turbomachinery design. An accurate prediction of forced response level of shrouded blades requires a very detailed finite element model in addition to a nonlinear solver. In order to perform nonlinear forced response analysis of blades at an affordable computational cost, applying a model order reduction technique is essential. The appeal for component mode synthesis methods in dimension reduction of structures with friction contacts is due to the possibility of retaining a subset of physical degrees of freedom (e.g. the contact degrees of freedom) in the set of generalized coordinates. In this paper, a reduction method recently developed for nonlinear forced response analysis of structures with local nonlinearity is evaluated and compared with two classical component mode synthesis reduction techniques. All three methods have the same projection basis, which includes residual flexibility attachment modes and free interface modes, but different implementation. The response is computed in the frequency domain using multiharmonic balance method and periodic contact forces are modeled with a node-to-node 3D friction contact model. In order to demonstrate the efficiency of the three formulations, a rod and a simplified shrouded turbine blade are considered as case studies. |
| Databáze: | OpenAIRE |
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