A novel deployable reflector using a lazy tong truss

Abstract EN

In this paper, a new concept for a deploy able parabolic reflector use d in SAR satellite has a support based on a two-dimensional lazy tong mechanism is proposed.

Two sets of lazy tong me chanisms are used, one at each side, to support the structure through its operation (deploy ing and folding).

The deploy ment of the structure is controlled by the vertic al inward movement of the ends of the first two bars in each me chanism.

This movement is direc te d by the strain energy stored in the he lical springs that work at those places.

A preliminary design of the quarter scale model of the sugge ste d reflector in deploy ed configuration is modeled and analy zed using ANSYS software program.

The value of the maximum defle ction and Von Mises stress due to effect of inertia load only are obtained for the composite material (T300/Hexcel 8552) of the reflective surface and hard aluminum alloy s (2024-T3) of the truss.

The y were 0.465 mm and 23.3 MPa respec tive ly .

The linear buckling behavior of the structure is as well studie d.

The first eige nvalue factor was about 19.639.

The theoretical total deploy ing time and velocity is considered and their magnitudes are about 0.14 sec.

and 0.46 m/s respec tive ly .

The packaging volume was about 1/6 th of deploy ing volume.

The total estimated mass of this quarte r scale reflector was approximately 2.5 kg.