A method for identifying the load transfer function of flexible connections based on active frequency sweep excitation

Abstract

This invention relates to a method for identifying the transfer function of a flexible connection load based on active frequency sweep excitation, relating to the field of spacecraft attitude control. The method includes the following steps: several triple-platform actuators sequentially output sinusoidal frequency sweep excitation torques in three rotational directions of the load; a high-bandwidth fiber optic gyroscope simultaneously measures the three-axis angular velocities of the load; the obtained time-domain results are converted to frequency-domain results, followed by load transfer function model identification; based on the identified model, the controller parameters in the triple-platform control unit are adjusted to increase the control bandwidth and enhance secondary control capabilities while ensuring the stability margin of the controller in the triple-platform control unit. This invention has the advantage of maximizing secondary control capabilities, providing a technical foundation for ultra-high precision pointing, ultra-high stability control, and high-quality imaging of future spacecraft optical payloads.

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