Study on the system reduction under the condition of dynamic load
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This study presents the methodology of the reduced system for dynamic analysis considering the selection criterion of the primary degrees of freedom based on the relation between natural frequency and external loading frequency. A well-constructed reduced system can provide the accurate representation of the dynamic behavior of a structure under arbitrary dynamic loads. If dynamic response based on a reduced system can be calculated accurately, the proposed method can save the computing time remarkably in problems which require repeated calculation such as optimization procedure or time integration. In addition, the proposed method shows the reliable dynamic response in multi-domain structure. Numerical examples demonstrate the reliability of the dynamic analysis obtained from a reduced system and responses of the reduced system are compared with those of a global system.
KeywordsTwo-level condensation scheme (TLCS) Sequential elimination method (SEM) Ritz vector, Reduced system (RS) Reduce order model (ROM)
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