Design of Fiber Optic Gyro Inertial Measurement System with High Vibration Resistance

Abstract

Because the inertial measurement system based on traditional inertial device cannot meet the requirements of the new tactical weapons, this paper demonstrates an inertial measurement system using full digital fiber optic gyro, impact resistant quartz accelerometer and ontology thin-walled reinforced metal alloy structure. It can be able to withstand severe shock, vibration and other mechanical environmental conditions and maintain a good accuracy, a long-term stability, improve the comprehensive performance of the inertial measurement system. Introduction Inertial measurement system is the realization of a missile, rocket and other vehicle guidance and stability control of key sensitive measuring equipment and benchmark information source, can be set benchmark coordinate system for the aircraft during flight, sensitive to the movement of the angular velocity and acceleration, accurate measuring posture, such as position, velocity, and high speed output data through the interface, at the same time as the inertial guidance and attitude control system to provide the measurement information, in order to realize stable flight, hit the target. New tactical weapons not only requires rapid response, mobile penetration and precision strike capability, also require miniaturization, multi-function, maintain high reliability in harsh environmental conditions, to adapt to the strong vibration, big impact and overload, and maintain long-term, stable performance and high life, able to keep stable performance under long-term storage conditions, the inertial measurement system of high demands are put forward. Inertial measurement system based on traditional inertial components often with imu, structure and accelerating rate gyroscope power system separation methods such as it is difficult to realize miniaturization, because there are a high speed rotor, mechanical inertial instrument itself ant-vibration performance is poor, external connection depends on the shock absorber can adapt to play on the bad mechanical environment request, this needs in service during test, calibration and maintenance for many times, long-term stability can t guarantee anything, but later period maintenance cost is high, the above analysis shows that the inertial measurement system based on traditional inertial device cannot meet the requirements of the new tactical weapons. Fiber optic gyro is a new type of solid-state inertial instrument based on the Sagnac effect, has small volume, light weight, high reliability, resistance to vibration and impact, as well as good mechanical environment characteristics, and optical fiber gyro inertial measurement system for its excellent performance as the key support of the new guidance and control system is being developed at home and abroad of new and high technology. The size of the fiber optic gyroscope developed in the initial stage is large, and the inner optical path of the fiber optic gyroscope and the fiber optic ring are not cured and packaged. Although some of them are cured, the traditional curing methods and materials cannot match the new material of fiber optic, so the anti-vibration and other performance indexes of the fiber optic gyroscope are not high. Existing accelerometers have poor impact resistance. When the accelerometer is subjected to a large impact along the direction of the output axis, the quartz flexible pendulum plate will be greatly deformed. Once the stress on the flexible beam is greater than the strength of the material, the flexible beam will fail. Ontology structure provide only part of the installation of the instrument design, circuit part and 2nd International Conference on Electrical and Electronic Engineering (EEE 2019) Copyright © 2019, the Authors. Published by Atlantis Press. This is an open access article under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/). Advances in Engineering Research, volume 185