Development of a “hingeless mast” and its applications

An Iterative Determination Method of an Axial Deployment Force of a Lanyard-Deployed Coilable Mast in Local Coil Mode

“…F ri , F vi , and F hi are three components of the diagonal cable tension. Thus, the forces and torques are balanced along the Oζ axis to satisfy Equation (8). It should be noted that the coilable mast is a spatially axisymmetric structure, so the force analysis of only one longeron is shown in Figure 7, and the forces and torques of the other two longerons on T are the same.…”

“…Natori et al listed three types of simplex masts and observed and compared the longeron deformation under different axial deployment forces [7]; however, they only performed a qualitative analysis and did not quantitatively determine the value of the axial development force. Kitamura et al studied a Y-section hingeless mast and determined an empirical formula for the axial deployment force of the coilable mast in local coil mode [8]. Although they found that the axial deployment force was affected by the stiffness and structure of the coilable mast, it is difficult to obtain the stiffness of the coilable mast through complex simulations and tests at the design stage due to the strong nonlinearity and rigid-flexible coupling characteristics.…”

Transformable Linked Panels

“…2 can be *Corresponding author e-mail: takatsuka@dali.nuac.nagoya-u.ac.jp stabilized with a snap-through phenomenon by spring-stretch using the tilted rotational axis, and its structure can be simulated by FEM as a stable structure. This spring-stretch stabilization method was proposed for the problem that the usage of framebuckling for the snap-through is difficult to adjust flexibility during deployment and stiffness on postdeployment, as in a coilable-longeron-mast [9] or self-supporting structure [10][11][12]. The spring-stretch stabilization can be used for the non-linear static analysis by FEM under the microgravity condition, as presented in the paper [1].…”