Because the accuracy of the existing airborne navigation is lacking in the polar region, it is difficult to ensure the safety and reliability of the aircraft when it is flying over the polar region. The integrated navigation system based on the inertial navigation technology uses multi-information fusion to assist collaborative navigation and obtain an indirect grid navigation algorithm that combines the azimuth navigation algorithm and the grid navigation algorithm to solve the existing problems. This paper analyzes the principle of the inertial navigation system in the polar region, the semiphysical simulation experiments are carried out by using the navigation theory and the background engineering, and the accuracies of the integrated navigation system of the indirect grid frame in the polar region and the integrated navigation system in the middle and low latitudes are consistent, which verifies the feasibility and effectiveness of the SINS/CNS/GPS integrated navigation system in the polar region. In addition, the paper provides the theoretical basis and the application of engineering to achieve the SINS/CNS/GPS integrated navigation system in the polar region.
Hemispherical Resonator Gyro (HRG) is a new type gyro with high precision, high reliability, shock resistance, no need of preheating, short start time, and long life. It is a kind of vibrating gyro with standing wave rotating along the sensitive base of annular precession, has a unique application prospect in the field of high precision inertial sensors, and is widely used in unmanned aerial vehicle control in complex environments. Based on the theory of the structure characteristics of the hemispherical resonator, the mathematical model of energy of the resonator is established to research the rule of resonant frequency when the hemispherical resonator is rotated around the central axis. In this paper, the influence of precession factor, which are the top angle, the bottom angle, and wall unevenness of the hemispherical resonator, are analyzed. A series of hemispherical resonator models are constructed by ANSYS software to prove the results of theoretical research. The simulation results show that precession factor of the hemispherical resonator is more sensitive of the top angle than the bottom angle, and the error of angular velocity which is caused by the change of the top angle is larger than that which is caused by the change of the bottom angle.
The life and damage of hemispherical resonator are important factors that directly affect the service time and safety of high-precision hemispherical resonator gyro. However, the fused silica glass material used in the hemispherical resonator which was processed in China is mainly imported, and it is too expensive to use the traditional fatigue life experiment, so it is necessary to use the software of fatigue life analysis to analyze its fatigue life. In the paper, the ANSYS software is used to analyze the fatigue life of fused silica hemispherical resonator, to determine the dangerous parts caused by the residual stress to analyze the crack propagation in the fatigue parts, and to obtain the sum stress intensity factor, so as to effectively monitor and prevent the fatigue-prone parts in the process of structural design and use of the hemispherical resonator.
In this paper, the laser shot peening technology of H13 steel is studied to improve the friction and wear performance of shield machine hob. And to utilize the laser shot peening (LSP) experiment and simulation analysis, the in uence of LSP parameters on the friction and wear performance of H13 steel after strengthening is studied. The results show that the residual stress and the depth of stress layer are increased after LSP, which is bene cial to reduce the friction and wear of material surface. In addition, the surface has a paint absorption layer which can absorb laser energy to avoid surface annealing. The maximum residual stress of H13 steel is 911 MPa and the hardness is 650.7 HV, when there are threetimes of black paint absorption and LSP. Compared with the raw material, the residual stress is increased by 125% and the hardness is increased by 18%. And its friction coe cients and wear volume were relatively lower than other schemes. The average friction coe cient and wear volume were reduced by 10.8% and 57.2% respectively.
In this paper, the laser shot peening technology of H13 steel is studied to improve the friction and wear performance of shield machine hob. And to utilize the laser shot peening (LSP) experiment and simulation analysis, the influence of LSP parameters on the friction and wear performance of H13 steel after strengthening is studied. The results show that the residual stress and the depth of stress layer are increased after LSP, which is beneficial to reduce the friction and wear of material surface. In addition, the surface has a paint absorption layer which can absorb laser energy to avoid surface annealing. The maximum residual stress of H13 steel is 911 MPa and the hardness is 650.7 HV, when there are three-times of black paint absorption and LSP. Compared with the raw material, the residual stress is increased by 125% and the hardness is increased by 18%. And its friction coefficients and wear volume were relatively lower than other schemes. The average friction coefficient and wear volume were reduced by 10.8% and 57.2% respectively.
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