Compensation and Suppression of Excitation Force of Rotary Opposed-Open Mechanical Shutter

The survey camera is one of primary scientific terminals of a 2 m aperture space telescope. The survey camera uses a rotary opposed-open mechanical shutter, and the exciting force generated when the shutter opens and closes will degrades the imaging resolution of optical telescope and needs to be suppressed. In order to solve this problem, this paper establishes a dynamic model of the mechanical shutter and proposes a dynamic compensation method for the excitation force. Combining the dynamic characteristics of cam movement with the principle of lever reversal compensation and amplification ensures that the inertial force on the mass point side of the lever is equal to the z-direction excitation force, and realizes the dynamic compensation and suppression of the shutter excitation force. The cam curve is optimized using the simplex method based on the principle of minimizing the residuals of the excitation force. After the cam curve is obtained, the kinematics simulation analysis of the mechanical shutter is carried out. The results show that the z-direction excitation force before and after the dynamic compensation method is 2.38 N and 0.29 N, and the suppression rate is 87.8%. The problem of suppressing the excitation force of the rotary opposed-open shutter under volume limit is solved.