Inertial platform systems parameters degradation finite element modeling

Abstract

The degradation of bearing preload and the creep of magnetic steel properties are the main degradation causes of inertial platform systems heading sensitive drift, gyroscopes installation error and other system parameters in the long-term storage conditions. Combining the bearing preload theory and magnetic steel properties creep law of inertial platform systems under poor environmental interference and long-term storage stress, a finite element modeling method of inertial platform systems bearing preload and magnetic steel properties creep law are presented respectively, after the complexity structure of the inertial platform systems components is appropriately simplified. Then, a integrated inertial platform systems finite element model (FEM) is obtained synthetically. The long-term stability of the degradation parameters is analyzed based on different FEMs. The result shows that the two FEMs can properly described the influence of bearing preload and magnetic steel properties creep on inertial platform systems heading sensitive drift, gyroscopes installation error and other system parameters, and reflect the degradation mechanism of inertial platform systems parameters. The long-term drift of bearing preload and magnetic steel properties creep can affect the parameter accuracy and stability of inertial platform systems. This study has great significance to the model-based PHM system design of inertial platform systems, which aims at improving the inertial platform systems parameters degradation stability.