Novel Four-Cell Lenticular Honeycomb Deployable Boom with Enhanced Stiffness

Abstract

Composite thin-walled booms can easily be folded and self-deployed by releasing stored strain energy. Thus, such booms can be used to deploy antennas, solar sails, and optical telescopes. In the present work, a new four-cell lenticular honeycomb deployable (FLHD) boom is proposed, and the relevant parameters are optimized. Coiling dynamics analysis of the FLHD boom under a pure bending load is performed using nonlinear explicit dynamics analysis, and the coiling simulation is divided into three consecutive steps, namely, the flattening step, the holding step, and the hub coiling step. An optimal design method for the coiling of the FLHD boom is developed based on a back propagation neural network (BPNN). A full factorial design of the experimental method is applied to create 36 sample points, and surrogate models of the coiling peak moment (Mpeak) and maximum principal stress (Smax) are established using the BPNN. Fatigue cracks caused by stress concentration are avoided by setting Smax to a specific constraint and the wrapping Mpeak and mass of the FLHD boom as objectives. Non-dominated sorting genetic algorithm-II is used for optimization via ISIGHT software.

Design, modeling, and manufacturing of high strain composites for space deployable structures

“…d Two asymmetric omega-shaped shells forms a closed-section 33 , 34 . e Four-cell lenticular combined cross-sections 37 . f Eight C-shape combined sections 38 .…”

“…Notably, the maximum stress showed higher sensitivity to changes in the central radius. Yang et al 37 also proposed a new four-cell lenticular honeycomb DCB, as shown in Fig. 2 e. Fatigue cracks caused by stress concentration are avoided by setting maximum principal stress to a specific constraint.…”

Smart Composite Booms for Solar Sails

“…Also in this case, numerical modeling is a very powerful mean to predict stress and strains arising during wrapping and deploying, by using CFRP booms [19,20]. Results have led to optimization of the boom geometry as in the case of four-cell lenticular honeycomb booms [21] or N-shaped composite ultra-thin booms [22].…”