Exploring quasi-linear FRFs obtained from impact testing for coupling nonlinear substructures

Frequency-based substructuring is a common and easy-to-apply technique for coupling or decoupling linear systems. If the systems are nonlinear, working in the frequency domain cannot readily be done. Recent works suggest controlling the response amplitude of a subsystem to gain quasi-linear FRFs. With that approach, each FRF, for each response level, can be coupled to another linear substructure, and the response can be predicted. The works in this direction are in their first stages, and with this abstract, we explore if the quasi-linear FRFs can be obtained from impact testing to lessen the experimental burden.