22 Validation Assessment for Joint Problem Using an Energy Dissipation Model 235 103 102 101 100 103 r2 Frequency (Hz) 3 by 3 window R2 r2 window r2 ref Fig. 22.8 3 point window validation metric This plot shows that the validation metric is below the reference metric until about 1,100 Hz. We believe that this show that using a windowed metric can provide more useful information on the range of model validity. 22.6 Summary From the results we see that the current simulation capability is best at predicting lower frequency SRS data and does not perform so well at higher frequencies. We understand that simulation capabilities may be better suited for certain output responses, and with this in mind it makes sense to use a validation metric that is capable of determining if the model is valid for a certain range of output responses. The windowed validation metric allows us to assess different output response ranges and provides more information about the representativeness of the simulation for a range of set points. Acknowledgments Sandia is a multi-program laboratory operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the United States Department of Energy’s National Nuclear Security Administration under Contract DE-AC04-94AL85000. References 1. Standard for verification and validation in computational fluid dynamics and heat transfer. American Society of Mechanical Engineers, New York (2009) 2. Segalman D (2002) A four-parameter Iwan model for lap-type joints. Sandia National Laboratories, Albuquerque, NM 3. Urbina A, Paez TL, Smallwood D (2006) A hierarchy of validation measures for structural dynamics. In: International modal analysis conference, St. Louis 4. Harris C, Crede C (1976) Shock and vibration handbook. McGraw-Hill, New York 5. Smallwood D (1981) An improved recursive formula for calculating shock response spectra. The Shock and Vibration Bulletin. A publication of the Shock and Vibration Information Center, Naval Research Laboratory, Washington, DC 6. Reese GM, Bhardwaj MK, Segalman DJ, Alvin KF, Driessen BJ, Pierson K, Walsh T (updated 2013) Salinas-user’s notes. SAND report 1999–2801, Sandia National Laboratories, Albuquerque, NM
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