On alternative control schemes for real-time dynamic substructuring tests

Dynamic substructuring, or hybrid testing, requires precise coupling between a numerical model and a physical specimen, to accurately reproduce the dynamic behaviour of a mechanical system of interest. This coupling consists of ensuring, via the use of actuators and transducers, that physical displacements and reaction forces closely correspond to those in the numerical model. A control system must be designed to ensure such coupling in real-time. Several approaches to this problem have been taken by a number of investigators. Here, we consider the influence of control system architecture on real-time dynamic substructuring test results. In particular, we present a review of two control methods proposed in the literature, with supporting analytical as well as experimental data. The paper demonstrates the importance of an appropriate choice of the control scheme for dynamic substructuring test result accuracy.