Space Inertial Sensor Test Mass Release Characteristics Study

The space gravitational wave detection device is based on the laser interference principle,in which the inertial sensor provides the reference frame for the laser interferometry system.During the satellite launch phase,which generates violent vibrations,the locking and releasing mechanism in the inertial sensor is responsible for fixing the test mass in the electrode cage and releasing the test mass with high positioning accuracy and very low residual velocity after the satellite is in orbit,which is then captured by the electrostatic control system.In the orbital release phase,if the test mass release fails or the release velocity is too large,the electrostatic control system cannot ensure that the test mass remains within the operating range.Therefore,this topic mainly focuses on the release process and release characteristics of the test mass,and the main research contents are as follows.(1)The design of the gripping positioning and releasing mechanism is determined under the premise of meeting the space size limitation and achieving the function.The overall stability of the mechanism is analyzed to avoid the impact of large deformation of the mechanism on the release characteristics of the test mass when the load is applied to the test mass.The finite element simulation analysis results show that the overall structural strength meets the design requirements.(2)Considering the extreme case of unilateral release of the test mass,and combining with the adhesion force model,the kinetic model of test mass release is established.Combining the test mass release kinetic model and the TMMF ground test findings,a research test program for the test mass release characteristics was determined.(3)Based on experimental design and agent modeling techniques to investigate the relationship between the three influencing factors of preload,pitch and yaw during test mass release and the release residual velocity.The Latin super-square is used to generate the initial sample,and the Kriging agent model is used to establish the functional relationship between the input parameters and the output response.The optimal release conditions were obtained based on the Kriging agent model and genetic optimization algorithm,and the accuracy of the output results was verified experimentally.(4)The performance test of the grasping positioning and releasing mechanism was conducted,and the results showed that the performance of the mechanism met the design requirements.The unilateral release test of the test mass was completed,and the test results showed that the release speed of the test mass is proportional to the size of the preload force,and the release speed has a tendency to increase and then decrease with the increase of the contact deviation angle.Compared with the vacuum environment,the release velocity of the test mass measured in air is smaller.