Design And Analysis Of Anti-high Overload Micro Inertial Measurement Unit

With the development of semiconductor technology,MEMS(Micro-Electro-Mechanical System)has been widely used in civil and military fields.In the military application of MEMS technology,the inertial navigation is an important research field.The inertial navigation system based on MEMS technology has many advantages,such as high precision,small size,great ability of anti-harsh environment,low cost and so on_In this paper,a MIMU(micro inertial measurement unit)is designed,which is suitable for high overload impact applications.The overall scheme of micro inertial measurement unit is designed according to the requirement of the project.According to the design scheme,the MEMS inertial sensor which are studied by the domestic institute are chosen and the application circuit is designed to achieve the function of inertial measurement.According to the principle of inertial measurement,the mechanical support structure is designed by chosen high strength metal to ensure reliability of structure under high overload condition.Selection of polyurethane foam as a potting material protect the electronic devices under high overload impact application environment.Using the finite element software ANSYS analysis the mechanical structure and the overall component after embedment.The simulation result provides a theoretical basis for the design of anti high overload protection of the MIMU.Select ARM microprocessor and design the corresponding control circuit to realize the data processing and communication function of MIMU.The data acquisition software of upper computer is designed by using the graphical programming software LabView,and the data acquisition and storage function of the micro inertial measurement unit is achieved.Establishing the non-orthogonal error model of the measurement coordinate system of the MIMU by analyzing the error principle,and the non orthogonal error compensation is carried out according to the calibration data.The preliminary environment simulation test of high overload impact is carried out.Comparison of the performance parameters before and after the test verifies that this design can meet the requirements of micro inertial measuring unit high overload resistibility and related performance indicators,which provides certain reference for the follow-up studies and has particular engineering application value.