Development of Efficient Reduced Models for Flexible Body Dynamic Simulation - IMAC 25

P.Avitabile, T.VanZandt, N.Wirkkala, B.Birdsong

Multibody simulation models often require residual flexibility in order to obtain proper model response. Accurate finite element models, validated by experimental modal tests and updated based on that test data, may be necessary to achieve the performance accuracy desired. Development of these models and performance of the test and model updating can be difficult and time consuming.

An alternate approach is proposed which is based on experimental measurements used to update a reduced order model. This reduced order model is then used to formulate the residual flexibility of the system without the need for a detailed test verified finite element model. The system models are developed from both modal and response based modeling approaches. In addition, effects of component interaction are introduced using modal based and impedance based modeling approaches. The technique is compared to the traditional full model approach to show the suitability of the proposed approach. Flexibility of the overall system as well as time response comparisons of the system are presented. An example structure is used to show the use of the proposed techniques.

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