Identification of Nonlinear Joint Mechanics for a Deployable Joint,
- S. J. Bullock, L. D. Peterson
- Proceedings of the 35th AIAA Structures…
The dynamic behavior of a reconfigurable adaptive truss structure with nonlinear joints is investigated. The objective is to experimentally examine the effects of the local nonlinearities on the global dynamics of the structure. Amplitude changes in the frequency response functions are measured at micron levels of motion. The amplitude and frequency variations of a number of modes indicate a nonlinear Coulomb friction response. Hysteretic bifurcation behavior is also measured at an amplitude approximately equal to the specified freeplay in the joint. Under the lg preload, however, the nonlinearity was dominantly characteristic of Coulomb friction with little evidence of freeplay stiffening.