Abstract The evolution of human spaceflight vehicles including launch vehicles continues to propose a perplexing conundrum in the structural dynamics field. Because of the size and weight of these vehicles, it becomes impossible to perform a ground based modal test that replicates all of the loading events of interest (i.e. liftoff, ascent, staging, etc.). As a result, human spaceflight programs have long relied on “building block approaches” to dynamic model updating and validation. Given the wide interpretation and definition of a “building block” approach to dynamic model validation, this paper reviews the state of art techniques used during the Saturn/Apollo and Space Shuttle dynamic test campaigns and contrasts them with the plans for the Space Launch System (SLS). Some of the lessons learned in each program are presented, in terms of how the building block approach was applied in developing models for stakeholders, using and updating analytical models, and use of other test result outside the dynamic tests.


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