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| Optimum strength control of adaptive trusses subject to nodal displacement constraints |
| Revised:September 16, 2002 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20042037 |
| KeyWord:adaptive truss,nodal displacement constraint,strength control,optimization |
| Long Lianchun~* \ Sui Yunkang \ Yang Zhiguang |
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| Abstract: |
| For adaptive truss structures, a control model that makes the working status of structures to be optimum and subject to multiple nodal displacement component constraints is presented. By using the adjustable ability of actuators embedded in the members of the structures, the strength and precision of static indeterminate trusses with coupling character of internal force are improved. Explicit expressions of member internal forces and nodal displacements to active deformations of actuators are deduced. The model is solved by mathematical programming method. When the nodal displacement component constraint is active, this model can improve the loading capacity of structures and ensure the nodal displacement component constraints. Moreover, when the nodal displacement component constraint is inactive, this model can still be used to improve the loading capacity of static indeterminate truss structures. For static indeterminate truss, the displacement constraint may induce increasing the maximum stress in structural controlling. For static determinate truss, the displacement constraint has no effect on the maximum stress in the structure. For complicated structures, in order to improve the efficiency of control, the number and displacement method of actuators can be changed. The control efficiency of this model is illustrated by numerical examples. It shows that few actuators can implement strength control and meet displacement constraints simultaneously. |
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