Mechanical Analysis on Temperature Control Platform of Star Sensor Based on Fluid-Solid Coupling

In order to study the mechanic characteristics of optical axis deviation of a star sensor temperature control platform under oil shock, one-way fluid-solid coupling method was used with ANSYS Workbench to calculate and analyze the platform subassembly, and a data fitting method was used to process deformation data of the flange mounting surface, the tilt displacement of the mounting surface and equivalent optical axis offset of the system were obtained. Structural calculation results show that the deformation of mounting surface reaches a peak value 1.1 e^-5 mm when flow velocity is about 2.2 m/s; The maximum equivalent optical axis offset is 0.0012″ within the given flow velocity range, and the equivalent offset of optical axis increases as the velocity increasing. The analysis results prove that star sensor temperature control platform can ensure the stability of optical axis of the system under oil circulation and provide references for structural design and analysis of similar system.

conclusion

1) At 1 Within the flow rate range of 2m/s to 3m/s, the flow trend of the fluid along the three axes is similar, and the overall flow rate distribution is uneven, which also leads to the asymmetry of the equivalent static pressure distribution in the flow field. The pressure difference in the oil circuit increases with the increase of flow rate.
2) The stress distribution of temperature control oil circuit components is asymmetric under different inlet flow rates. Stress concentration occurs at the inlet bend of the oil pipeline, and the peak value of the concentrated stress is the maximum equivalent stress value at the corresponding flow rate. As the flow rate increases, the maximum equivalent stress of the structure increases.
3) At different flow rates, the installation surface of the star sensor adapter flange mainly exhibits a forward and backward tilt along the optical axis direction (Z-axis direction), with the maximum deformation occurring in the upper part and without strict symmetry. As the flow rate increases, the deformation also increases.
4) After data fitting, the deformation of the installation surface is about 2 At 2m/s, there is a peak value of 1 1e-5mm; The equivalent offset of the optical axis gradually increases with the increase of flow velocity.