88 K. J. Pederson et al. Lastly, it is common practice in force-limited testing to sum multiple load cells to calculate total force in the test axis. During in situ calibration, it is important to consider how applying a blanket sensitivity adjustment factor decreases the accuracy of individual load cell readings. Each individual load cell should have its own respective adjustment factor; however, after the summing has occurred, this is not possible. Using individual load cell readings for model validation or applying additional test limits now requires relying on slightly inaccurate force readings. Future studies, as described above, should aim to quantify the ramifications of performing in situ calibration on load cells that are required for either multiple axis of force limiting or are needed for comparison to analytical models. With this information, test engineers will have a better understanding of how these pitfalls affect a test and its accompanying results. Quantification of these uncertainties will allow the test engineer to better inform their customer of negative ramification of in situ calibrations and ultimately provide improved insight into the testing. References 1. Scharton, T.D.: Analysis of dual control vibration testing. Annual Technical Meeting (1990) 2. Scharton, T.D.: Cassini spacecraft force limited vibration testing. Sound Vib. (1999) 3. Mcnelis, M.E.: Benefits of Force Limiting Vibration Testing. NASA/TM 1999-209382 4. NASA-HDBK-7004C: Force Limited Vibration Testing, 30 Nov 2012 5. Staab, L.D.: Application of the Semi-Empirical Force-Limiting Approach for the CoNNeCT SCAN Testbed, NASA/TM 2012-217627 6. Irvine, T.:An Introduction to Frequency Response Functions. 11 Aug 2000
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