In advance of a computational model updating or an error localization, it can be advantageous to make a preparatory error localization using a nominal analytical model. The purpose is then to select parameters for quantifying model errors and also to design effective tests for determining the best parameter setting. For successful error localization, the test data must be informative with respect to the model parameters chosen. For dynamic computational models, the demand for test data informativeness puts limitations on the experiment with regard to spatial resolution of sensors, bandwidth of excitation, signal-to-noise ratios, etc. Solving a full test design optimization problem is a huge task, sometimes impossible in practice, due to its combinatorial nature. The number of possible sensor/actuator placement combinations grows rapidly as the number of sensor and actuator candidates increases. For industrial sized problems, finding a sub-optimal solution may be a more realistic target. The aim of this study is to quantify data informative-ness, shown to relate to the Fisher information matrix, with respect to physical parameters that are used in error localization and model updating. Deterministic finite-element models in combination with stochastic noise models are used for evaluating data informativeness, and a procedure for test design optimization with respect to this is devised.
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