Table 1: Accuracies of Approximate Sensitivity Analysis Methods (CB 2 = (EI/UA)) Additional insight into accuracy of the three approximate analysis methods is provided in Figures 2, which compares envelopes of eigenvalue and mode shape errors as a function of parametric change, respectively. It is clear that both the classical residual and new methods offer reliable accuracies for sensitivity analysis over a wide range of parametric variation. Figure 2: Eigenvalue and Mode shape Error [1-diag(COR)] Envelopes over a Wide Range of Parametric Variation 5.2 APPLICATIONS The new sensitivity analysis method was first applied as part of the International Space Station P-5 modal test project (see Figure 3) in the spring of 2000 for sensitivity and test-analysis reconciliation[1]. That effort successfully mapped the sensitivity of test article modes primarily associated with spherical joint play and achieved NASA’s stated test-analysis reconciliation goals within two weeks of laboratory test completion. This represented the first application of the new method, which appeared to be accurate and effective; however, the developer (R. Coppolino) did not provide rigorous justification of the sensitivity analysis formulation at that time. Figure 3: International Space Station P-5 Short Spacer 381
RkJQdWJsaXNoZXIy MTMzNzEzMQ==