Abstract: In view of the relative small installation space and loading capacity for a small aircraft, a “T” frame micro inertial measurement unit (MIMU) system is proposed in which inertial sensors based on micro electromechanical system (MEMS) technology are selected. Based on the research of MIMU basic design principles and methods, the “T” support frame is designed and machined and then the “T” frame MIMU system is composed. The volume and weight of this MIMU system are reduced by making the best use of the installation space. Analysis by the finite element model shows that this MIMU has high dynamic performance. This system is used in the practical independent flight of a small aircraft and the results show that this MIMU is applicable for small aircraft.

Key words: micro electromechanical systems, micro inertial measurement unit, design of structure, finite element analysis, “T” frame