Research on Spacecraft Dynamic Interface Force Identification Based on Strain Detection

Abstract

The static/dynamic interface force between spacecraft and rocket is an important reference for spacecraft structure design. The most conventional dynamic force identification method is finite element simulation combined with the telemeter acceleration data, which restricts the spacecraft design level owing to the large error. A dynamic force identification method according to the detected strain field of attachment and its optimization plans are proposed. Three-way strain rosettes are mounted outside the docking ring densely. And the six Degree Of Freedom force can be derived by strain field. Considering the requests of engineering application, under the premise that detection result would meet the accuracy requirement, an optimization plan which reduce the detecting point is proposed. Results of dynamic simulation show that, only X direction bending moment identification error is 19.8%, and other loads identification error are below 10%. The test results show that both identification errors of static and dynamic load are below 20%, which can meet the engineering requirements.