A quick update method of coupled vibration responses for efficient evaluation of changed satellite structure

Abstract

Coupled loads analysis (CLA) has been used in order to evaluate structural design of satellite for vibration environment during launch and micro-vibration disturbance environment on-orbit. Each time the design of satellite’s substructure is updated, CLA, which is to calculate coupled vibration responses by using coupled whole model, needs to be performed. In the case of frequently re-calculation, CLA is not an efficient means due to its costly calculation caused by coupling of updated models, defining forcing function and managing and assessment re-calculation result of finite element analysis. Therefore, there is a need for a method for efficiently calculating coupled vibration responses. In this paper we propose a quick update method of coupled vibration responses to evaluate updated design efficiently without the costly calculation. In the proposed method, the initial accelerations at the boundary of substructures without coupling of them are once calculated, and then the initial boundary accelerations can be updated to the coupled boundary accelerations by simple matrices calculation using Craig-Bampton model parameters of substructures. We show a calculation example of the proposed method with simulation models, which demonstrates that the coupled accelerations calculated by the proposed method correspond well with those of finite element analysis results.

Keywords

• vibration response analysis
• satellite structure design
• craig bampton
• micro vibration disturbance
• coupled loads analysis
• launch vehicle