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Identification of Non-linear Joint Parameters by using Frequency Response Residuals
| Content Provider | Semantic Scholar |
|---|---|
| Author | Böswald, Marc |
| Copyright Year | 2005 |
| Abstract | paper, a method is presented, which aims at the extension of the finite element method for the description of the dynamic behaviour of structures with non-linear joints. Such non-linear joints may either be structural connections, such as bolted or riveted joints between otherwise linear substructures, or may be non-linear interface conditions, such as friction, clearance, or bilinear stiffness between pre-loaded contacting surfaces. The approach to be presented is based on the harmonic balance method for the calculation of effective stiffness and damping coefficients, which shall characterise the properties of the non-linear joints between linear substructures. The representation of non-linear joints by their effective stiffness and damping properties allows for the calculation of non-linear frequency responses. The parameters describing the stiffness and damping properties of a joint generally suffer from a huge amount of uncertainty, even in the linear case. The calculation of the effective stiffness and damping properties of a simple bolted joint may be considered as an example. The determination of parameters describing the non-linear stiffness and damping properties is even more subject to uncertainty. Therefore, the application of a model updating procedure will be presented here, which allows for the adjustment of not only linear stiffness and damping parameters but also of such non-linear parameters by minimising the differences between experimental and analytical non-linear frequency response functions. Thus, the application of this model updating procedure yields a finite element model with an improved prediction capability in the non-linear regime. The procedure to be presented was developed within the European Research Project CERES and was applied there for non-linear frequency response analysis and non-linear joint parameter identification of a complex large order finite element model of an aero-engine structure. Examples will be presented. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.sem-proceedings.com/23i/sem.org-IMAC-XXIII-Conf-s18p03-Identification-Non-linear-Joint-Parameters-by-Using-Frequency.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
