Stiffness Characterization of an Inflated Airbag Based Three Axis Motion Platform
An actively controlled airbag system used as a three axis motion platform is characterized by a unique application of the multiple input H1 Frequency Response Function (FRF) estimator. The goal of the testing is to understand the lateral (in-plane) 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 0.69 G/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 4.2 Hz as pressure and height varied. The static lateral stiffness increased on average 3.4 fold, from 6.5 to 22.2 N/cm from the lowest to highest pressure.
KeywordsAirbag Motion Platform Stiffness Estimation
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