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Creating a test validated structural dynamic finite element model of the x-56a aircraft
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Pak, Chan-Gi Truong, Samson |
| Copyright Year | 2014 |
| Description | Small modeling errors in the finite element model will eventually induce errors in the structural flexibility and mass, thus propagating into unpredictable errors in the unsteady aerodynamics and the control law design. One of the primary objectives of the Multi Utility Technology Test-bed, X-56A aircraft, is the flight demonstration of active flutter suppression, and therefore in this study, the identification of the primary and secondary modes for the structural model tuning based on the flutter analysis of the X-56A aircraft. The ground vibration test-validated structural dynamic finite element model of the X-56A aircraft is created in this study. The structural dynamic finite element model of the X-56A aircraft is improved using a model tuning tool. In this study, two different weight configurations of the X-56A aircraft have been improved in a single optimization run. Frequency and the cross-orthogonality (mode shape) matrix were the primary focus for improvement, while other properties such as center of gravity location, total weight, and offdiagonal terms of the mass orthogonality matrix were used as constraints. The end result was a more improved and desirable structural dynamic finite element model configuration for the X-56A aircraft. Improved frequencies and mode shapes in this study increased average flutter speeds of the X-56A aircraft by 7.6% compared to the baseline model. |
| File Size | 2863726 |
| Page Count | 39 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20140010281 |
| Archival Resource Key | ark:/13960/t8ff8s547 |
| Language | English |
| Publisher Date | 2014-06-16 |
| Access Restriction | Open |
| Subject Keyword | Ground Vibration Test Multi-utility Technology Test Bed Aircraft Structural Dynamic Model Tuning Structural Design Orthogonality Tuning Aircraft Models Finite Element Method Errors Ground Tests Research Aircraft Unsteady Aerodynamics Dynamic Models Mathematical Models Flutter Analysis Vibration Tests Aeroelasticity Structural Analysis Multidisciplinary Design Optimization Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
