Synthesis of shuttle vehicle damping using substructure test results

Abstract

An empirical method is developed for predicting the modal damping of a combined parallel-stage Shuttle model by means of damping measurements performed on the individual substructures.Correlations are first determined for each component in terms of damping energy as a function of peak kinetic energy and modal amplitude. The results are then used to predict component damping energies corresponding to the respective kinetic energies and amplitudes that occur for the new modes of the combined System. Modal characteristics for the System, other than damping, are obtained by a real eigenvalue solution of dynamic equations developed by Hurty's procedure of substructures. System equations, which include component modal damping, are also solved by a complex eigenvalue approach for comparison with results of the empirical method.

Dynamically substructured system frameworks with strict separation of numerical and physical components

“…Dynamically substructured system (DSS) is a testing method used in the dynamics testing community. The uses of the DSS concept can be found in areas such as civil engineering , robotics , automotive , and aerospace . A DSS contains both physical components (called physical substructure) and numerical components (called numerical substructure), which are to be synchronized during a testing so that the DSS response can be as close as possible to that of the original emulated system.…”

Application of a novel robust anti-windup technique to dynamically substructured systems

“…This idea can overcome drawbacks involved with purely numerical or purely physical testing (see [2], [3]). The uses of the DSS concept can be found in areas such as automotive [4], aerospace [5], civil engineering [6] and robotics [7]. DSS is distinguishable from the hardware-in-the-loop (HIL) method, which is traditionally used to test the performance of a controller, with a hardware interface to an embedded numerical plant, before it is implemented on a real plant.…”