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Variable-domain displacement transfer functions for converting surface strains into deflections for structural deformed shape predictions
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Fleischer, Van Tran Ko, William L. |
| Copyright Year | 2015 |
| Description | Variable-Domain Displacement Transfer Functions were formulated for shape predictions of complex wing structures, for which surface strain-sensing stations must be properly distributed to avoid jointed junctures, and must be increased in the high strain gradient region. Each embedded beam (depth-wise cross section of structure along a surface strain-sensing line) was discretized into small variable domains. Thus, the surface strain distribution can be described with a piecewise linear or a piecewise nonlinear function. Through discretization, the embedded beam curvature equation can be piece-wisely integrated to obtain the Variable-Domain Displacement Transfer Functions (for each embedded beam), which are expressed in terms of geometrical parameters of the embedded beam and the surface strains along the strain-sensing line. By inputting the surface strain data into the Displacement Transfer Functions, slopes and deflections along each embedded beam can be calculated for mapping out overall structural deformed shapes. A long tapered cantilever tubular beam was chosen for shape prediction analysis. The input surface strains were analytically generated from finite-element analysis. The shape prediction accuracies of the Variable- Domain Displacement Transfer Functions were then determined in light of the finite-element generated slopes and deflections, and were fofound to be comparable to the accuracies of the constant-domain Displacement Transfer Functions |
| File Size | 2311557 |
| Page Count | 82 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20150005777 |
| Archival Resource Key | ark:/13960/t5cc60x0r |
| Language | English |
| Publisher Date | 2015-03-01 |
| Access Restriction | Open |
| Subject Keyword | Displacement Transfer Functions Displacement Theory Deflection Equations Slopes Structural Design Deformation Deflection Transfer Functions Curved Panels Embedding Cantilever Beams Displacement Finite Element Method Errors Differential Equations Predictions Strain Distribution Shape Functions Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
