Estimating Rotational Frequency Response Function Using Mode Expansion and Frequency Response Function Synthesis Method

The rotational frequency response function (RFRF) plays a crucial role in increasing the accuracy of calculated results frequency-based substructuring method. However, RFRFs are often omitted due to difficulties measurement process and limitations equipment. This paper presents scheme estimating FRF an irregular plate structure using FE model reduction expansion reduced was introduced improved system (IRS) expanded experimental modal (EMA model) (SEREP) method then employed derive translational FRFs from EMA model. evaluated with plate. It found that estimated proposed were good agreement counterparts. Furthermore, patterns well correlated RFRFs. work shows may offer attractive alternative way accurately determining RFRs complex structures or structural components.