Stiffness characterization of an inflated airbag based three axis motion platform

Document Type

Conference Proceeding

Publication Date



Department of Mechanical Engineering-Engineering Mechanics


An actively controlled airbag system used as a three axis motion platform is characterized by a unique application of themultiple input H1 Frequency Response Function (FRF) estimator. The goal of the testing is to understand the lateral (inplane) stiffness properties of the inflated airbag at different inflation pressures and heights. The characterization is required to explore the controllability of the platform. The dynamic lateral magnitude increased 11.3%, from 0.62 to 0.69G/N, on average while damping decreased by 11.5%, from 0.164 to 0.147, as height increased. Furthermore, the natural frequency shifted from 8.6 to 4.2Hz as pressure and height varied. The static lateral stiffness increased on average 3.4 fold, from 6.5 to 22.2N/cm from the lowest to highest pressure.

Publisher's Statement

© The Society for Experimental Mechanics, Inc. 2016. Publisher’s version of record: https://doi.org/10.1007/978-3-319-29859-7_13

Publication Title

Conference Proceedings of the Society for Experimental Mechanics Series