22 B. Dagny and Y. Kieran Fig. 7 Reapplied force response comparison at top corner of the RC of a component is unknown, which is often the case in practice. For example, the response of a specific component in a flight vehicle might be desired to qualify the component. However, force reconstruction will not help predict the response of that component if the dynamics of the connection to the flight vehicle is not also quantified. Error in the defined boundary conditions of a component will also propagate to the component’s response. Conclusion This work investigated how errors in applied loads to FEA models propagates to the predicted responses. First, the BARC model was used to quantify how errors in applied loads propagate to the predicted response using a common force estimation technique. The exercise showed that the error in response can be significantly larger than the error in the input, and that even reasonable estimates of input force can produce huge response errors. Next, the same BARC model was used to illustrate how uncertainties in the boundary conditions of a component of interest will also propagate to errors in the predicted response, even if the force reconstruction is perfect. Future work should focus on developing techniques and promoting best practices for analysts to characterize errors in both applied forces and boundary conditions. References 1. “FEMtools Model Updating: An Integrated Solution for Structural Dynamics Simulation, Finite Element Model Verification, Validation and Updating” FEMtools. https://www.femtools.com/products/ftmu.htm.
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