Estimation of heat field and temperature models of errors in fiber-optic gyroscopes used in aerospace systems
DOI:
https://doi.org/10.15587/1729-4061.2017.93320Keywords:
gyroscope, finite element model, nonstationary thermal conductivity, instrumental errors, temperature model, calibrationAbstract
Numerical-analytical models of the nonstationary thermal process and the associated with it measurement errors were designed and investigated for fiber-optic gyroscopes (FOG). The models were used for simulating output data of the measuring gyroscopic module (MGM) consisting of a FOG of the studied type at arbitrarily assigned operation temperature conditions. Numerical simulation of nonstationary thermal fields in the instruments at an arbitrarily varying ambient temperature was carried out. Taking into account the temperature values, magnitude of the instrumental measurement errors characteristic of the studied FOG type is predicted. Further, these errors are taken into account when simulating output of the MGM having characteristics similar to the characteristics of the real instrument. To confirm the thermal model veracity, comparison of the numerical modeling results with experimental data was made. Adequacy of the models of instrumental errors for the studied FOG type is ensured by the instrument pre-calibration. A procedure for calibrating models of MGM errors notable for the possibility of joint identification of all IEs using one redundant volume of measurements has been developed. Further evolvement of this procedure will enable refinement of configuration and layout of temperature sensors in the MGM in order to improve quality of the measurement error compensation in the subsequent operation of the instrument and improve the layout of the MGM electronic and structural components in terms of reducing influence of the perturbing thermal factors.
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Copyright (c) 2017 Dmytro Breslavsky, Valerii Uspensky, Alyona Kozlyuk, Serhii Paschenko, Oksana Tatarinova, Yuriy Kuznyetsov
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