Predicted and Measured Strain Responses of Isotropic Panels to Base Excitation
Abstract
The objective of the research described is to assess the accuracy of classical linear theory fro predicting acceleration and strain for cantilevered and clamped free-clamped free (C-F-C-F) panels excited through the base. Aluminum, stainless steel, and titanium panels of various dimensions and thicknesses were vibration tested by using a broadband random signal applied through a shaker mounting fixture. The strains were measured at nine locations on each cantilevered panel and at five locations on each C-F-C-F panel. Accelerations were measured on the base and at one panel location for both the cantilevered and the C-F-C-F panels. Predictions were based on the Ritz method with assumed beam functions. The measured accelerations of the base and modal damping values were input to the analysis. Measured and predicted modal frequencies agree to within 4 percent. Comparisons between predicted and measured strain and acceleration spectra were within an average error of 20 percent for both the cantilevered and the C-F-C-F panels.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1988
- Accession Number
- ADA197950
Entities
People
- Edward F. Daniels
- Jack D. Leatherwood
- Karen H. Lyle
Organizations
- National Aeronautics and Space Administration