Variable-stroke self-adaptive adjustment quasi-zero stiffness device and parameter checking method
A variable-stroke self-adaptive adjustment quasi-zero stiffness device includes an integrating sphere, a target, a collimator, a pointing measuring instrument, a disturbance source, an inertia simulation tooling, a quasi-zero stiffness suspension adjustment device and an optical air-bearing platform. The integrating sphere, the target and the collimator are coaxially mounted on the optical air-bearing platform in sequence. The pointing measuring instrument is connected and fixed with the inertia simulation tooling through a screw; three disturbance sources are mounted on the inertia simulation tooling to provide small disturbance and inertia for the pointing measuring instrument; the quasi-zero stiffness suspension adjustment device suspends the inertia simulation tooling to provide a free boundary environment; and the quasi-zero stiffness suspension adjustment device, the pointing measuring instrument, the disturbance source and the inertia simulation tooling form a set of two-pendulum system as a whole.
1 . A variable-stroke self-adaptive adjustment quasi-zero stiffness device, comprising:
an integrating sphere;
a target;
a collimator;
a pointing measuring instrument;
a disturbance source;
an inertia simulation tooling;
a quasi-zero stiffness suspension adjustment device; and
an optical air-bearing platform,
wherein:
the integrating sphere, the target and the collimator are coaxially mounted on the optical air-bearing platform in sequence;
the integrating sphere provides a light source, the target provides point target information, and the collimator simulates infinity;
the pointing measuring instrument is an object to be tested, the inertia simulation tooling is a hollow cubic structure, and the pointing measuring instrument is connected and fixed with the inertia simulation tooling through a screw;
three disturbance sources are mounted on the inertia simulation tooling to provide a disturbance and inertia for the pointing measuring instrument;
the quasi-zero stiffness suspension adjustment device suspends the inertia simulation tooling to provide a free boundary environment; and
the quasi-zero stiffness suspension adjustment device, the pointing measuring instrument, the disturbance source and the inertia simulation tooling form a set of two-pendulum system as a whole.
2 . The variable-stroke self-adaptive adjustment quasi-zero stiffness device according to claim 1 , wherein the inertia simulation tooling comprises a mounting flange, and is connected with the pointing measuring instrument through the mounting flange, and a counterweight is mounted on a side surface of the inertia simulation tooling opposite to the pointing measuring instrument.
3 . The variable-stroke self-adaptive adjustment quasi-zero stiffness device according to claim 1 , wherein:
after the inertia simulation tooling is suspended, the quasi-zero stiffness suspension adjustment device preforms a direction adjustment of six degrees of freedom such that the pointing measuring instrument faces the collimator,
the six degrees of freedom comprise x, y, z, U, V, and W, and
x, y and z are defined to represent three mutually perpendicular coordinate axis directions with a center of mass of the pointing measuring instrument as an origin, z is an optical axis direction, and U, V and W represent directions of degrees of freedom for rotation around the x, y and z axis directions, respectively.
4 . The variable-stroke self-adaptive adjustment quasi-zero stiffness device according to claim 1 , wherein characteristic frequencies of the two-pendulum system are 0.114 Hz and 0.295 Hz, respectively.
5 . The variable-stroke self-adaptive adjustment quasi-zero stiffness device according to claim 1 , wherein three disturbance sources are mounted on three surfaces of the inertia simulation tooling, respectively, and normals of the three disturbance sources are perpendicular to each other.
6 . The variable-stroke self-adaptive adjustment quasi-zero stiffness device according to claim 1 , wherein the quasi-zero stiffness suspension adjustment device comprises: a suspension crown block, suspenders, a -shaped tooling, a spring, a double-stroke bolt assembly and a first suspension point;
wherein the -shaped tooling is arranged horizontally, with four second suspension points at four corners of its upper end face and four third suspension points at four corners of its lower end face; the four second suspension points are respectively connected to the suspension crown block through the high-stiffness suspenders, and the four third suspension points are respectively connected to upper ends of corresponding springs under the -shaped tooling through the suspenders; and lower ends of four springs each are connected with the first suspension point through the double-stroke bolt assembly.
7 . The variable-stroke self-adaptive adjustment quasi-zero stiffness device according to claim 6 , wherein a top of the inertia simulation tooling comprises four hooks, which are respectively connected with four first suspension points at a lower end of the quasi-zero stiffness suspension adjustment device; and the double-stroke bolt assembly comprises a two-sided nut frame and two M16 high-strength bolts.