Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : stowed

A Novel Deployable Reflector using a Lazy Tong Truss

Nabil Noor Swadi

Engineering and Technology Journal, 2012, Volume 30, Issue 11, Pages 1912-1924

In this paper, a new concept for a deployable parabolic reflector used in SAR
satellite has a support based on a two-dimensional lazy tong mechanism is
proposed. Two sets of lazy tong mechanisms are used, one at each side, to support
the structure through its operation (deploying and folding). The deployment of the
structure is controlled by the vertical inward movement of the ends of the first two
bars in each mechanism. This movement is directed by the strain energy stored in
the helical springs that work at those places. A preliminary design of the quarter
scale model of the suggested reflector in deployed configuration is modeled and
analyzed using ANSYS software program. The value of the maximum deflection
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 alloys (2024-T3) of the truss. They were 0.465 mm and 23.3 MPa
respectively. The linear buckling behavior of the structure is as well studied. The
first eigenvalue factor was about 19.639. The theoretical total deploying time and
velocity is considered and their magnitudes are about 0.14 sec. and 0.46 m/s
respectively. The packaging volume was about 1/6th of deploying volume. The total
estimated mass of this quarter scale reflector was approximately 2.5 kg.