System Identification and Simulation of a Triaxial Shaker System,
TRW SYSTEMS GROUP SAN BERNARDINO CA
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A simulation of a triaxial shaker system is being constructed to evaluate system capabilities and limitations, supplement live vibration testing, support test methodology and test procedure development, and aid in making controller software modifications. Two different types of models have been implemented in the simulation. The first is a physically-based model derived from a finite element analysis together with a model-updating system identification scheme the second is a parametric model without direct physical significance. The advantages and disadvantages of each model for this application are considered. The methods used to derive each of the models are described. Test cases were used to evaluate the effectiveness of some of the methods. Results of the system identification process are discussed. Certain methods are found to produce models that are in good agreement with measured response data from the actual shaker system.