System model modes developed from expansion of uncoupled component dynamic data

Abstract

System models are often developed from component models either as modal components or as reduced order models. The resulting system model data is only available at the reduced order space unless some expansion is performed. Of course this can be achieved using system model mapping matrices but that requires the development of the full space system model which defeats the purpose of the component synthesis approach.However, the individual uncoupled component mapping matrices can be utilized to expand to the full space of the system model provided the modes of the components span thespace of the full system model. This paper shows the results of using component modes from the unconnected componentsas projection matrices to identify the system level full field response. Multiple analytical cases are presented to show how the selection of component modes affects the expansion results. The results show accurate system model expansion using a sufficient set of component modes that span the space of the system model. © 2014 Journal of Mechanical Engineering. All rights reserved.