Method for increasing movement stability of driving mechanism of spaceborne antenna with gap

Abstract

The invention relates to a method for increasing the movement stability of a driving mechanism of a spaceborne antenna with a gap. The method is based on multibody system dynamics theories, flexible multibody system dynamics and a kinematic pair gap contact collision model. A spaceborne antenna driving mechanism dynamics model which taking a kinematic pair gap into consideration is established, and the influence of the gap on the dynamic characteristics of a reflecting plane of the spaceborne antenna is analyzed through value simulation. Minimizing the maximal peak value of movement acceleration jitter of the reflecting plane of the spaceborne antenna is taken as an optimization target. The element contact collision parameters of the kinematic pair with a gap are optimized without changing the basic structural parameters of the driving mechanism of the spaceborne antenna, and the auxiliary material of the elements of kinematic pair with a gap is selected to improve the movement stability of the driving mechanism of the spaceborne antenna. The element contact collision parameters of a kinematic pair with a gap are optimized, and proper auxiliary material of the kinematic pair is selected to substantially reduce the impact effect caused by gap contact collision of the kinematic pair, and reduce the influence of the gap on the movement stability of the driving mechanism of a spaceborne antenna. The method is simple, feasible and practical, and can be widely applicable to driving mechanisms of various spacecrafts.

Description

technical field [0001] The invention relates to the field of mechanical technology, in particular to a method for improving the motion stability of a space-borne antenna drive mechanism with a gap. Background technique [0002] With the continuous development of precision mechanical engineering and aerospace engineering, the mechanism system is moving towards the goals of high precision, high efficiency, high stability and high reliability. In engineering practice, due to the need for dynamic fit, manufacturing errors, friction and wear, etc., Kinematic pair gaps in mechanisms are unavoidable. [0003] The existence of gaps will cause contact and collision between the moving sub-elements, causing the mechanism to vibrate violently with high amplitude and frequency, resulting in serious vibration, which in turn reduces the motion stability of the mechanism, especially for high-precision In the spacecraft drive mechanism, the influence of the clearance of the kinematic pair c...

AI Technical Summary

Problems solved by technology

Or simplify the kinematic pair gap to a massless rigid rod, and then transform the original gap-containing mechanism into a gapless multi-rod multi-degree-of-freedom system for motion analysis and design. The disadvantage of this method is that the contact between the kinematic pair and sub-elements is ignored. The elastic deformation of the surface cannot truly reflect the contact and collision characteristics of the kinematic pair of the mechanism with clearance, which is inconsistent with the actual situation

Images