Abstract
As part of a research effort to study the microgravity dynamics of a truss with pinned joints, a single strut with a single clevis-tang pinned joint was characterized. Experimental data was collected using a force-state mapping technique. The strut was subjected to axial dynamic loads and the response of the strut was measured. The force-state map aids visualization of the strut dynamics. Finite element modeling of the response was explored. An example is presented that uses a method of manual determination of the finite element model parameters. The finite element model results correspond well with the measured strut response.
Highlights
Deployable space structures typically incorporate multiple revolute joints
The truss using pinned joints had significantly more damping and exhibited nonlinear behavior. They reported that when large preloads were applied across pinned joints in the truss, the damping was reduced and the dynamic behavior was very similar to the truss using only tightly clamped joints
Dynamic behavior due to the joints is very dependent on many variables such as the joint design and the condition of joint interfaces
Summary
Deployable space structures typically incorporate multiple revolute (e.g., pinned) joints. If the joint design allows a small amount of "slop" or deadband, the dynamic behavior of the structure can be dramatically altered. The deadband and friction characteristics in this type of joint can introduce nonlinearities into the joint behavior. Nonlinear response in these joints is difficult to predict and can limit the use of such a truss. The truss using pinned joints had significantly more damping and exhibited nonlinear behavior. They reported that when large preloads were applied across pinned joints in the truss, the damping was reduced and the dynamic behavior was very similar to the truss using only tightly clamped joints.
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