Modeling and Optimization of METS: An Enveloping Tensegrity Structure for Adaptive Stiffness Control in Space Applications

Brigham Young University Engineering Building, Provo, UT

Tensegrity structures, defined by rigid elements in compression balanced by tensioned members, offer lightweight, flexible solutions for adaptive space systems. Stiffness modulation is vital for space applications, such as reinforcing robotic arms, stabilizing astronaut suits, and supporting deployable structures in microgravity. Traditional systems often rely on heavy actuators or rigid components, limiting adaptability and increasing mass. This research presents the Multi-Stiffness Expandable Tensegrity Structure (METS), an enveloping tensegrity system designed to conform to spacecraft appendages and provide tunable stiffness without external power. Using control string actuation and unit cell optimization, METS achieves scalability and adaptability, validated through modeling, innovation, and experiments targeting a 15% stiffness increase. This work advances lightweight, passive structures for NASA missions.