FEM correlation and shock analysis of a VNC MEMS mirror segment
2014
Microelectromechanical systems(MEMS) are becoming more prevalent in today’s advanced
space technologies. The Visible Nulling
Coronagraph(VNC) instrument, being developed at the NASA Goddard Space Flight Center, uses a MEMS Mirror to correct wavefront errors. This MEMS Mirror, the Multiple Mirror Array (MMA), is a key component that will enable the VNC instrument to detect Jupiter and ultimately Earth size
exoplanets. Like other MEMS devices, the MMA faces several challenges associated with
spaceflight. Therefore, Finite Element Analysis (FEA) is being used to predict the behavior of a single MMA segment under different
spaceflight-related environments. Finite Element Analysis results are used to guide the MMA design and ensure its survival during launch and mission operations. A Finite Element Model (FEM) has been developed of the MMA using COMSOL. This model has been correlated to static loading on test specimens. The correlation was performed in several steps—simple beam models were correlated initially, followed by increasingly complex and higher fidelity models of the MMA mirror segment. Subsequently, the model has been used to predict the dynamic behavior and stresses of the MMA segment in a representative
spaceflightmechanical shock environment. The results of the correlation and the stresses associated with a shock event are presented herein.
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