压电智能桁架结构的位移最优控制

使压电智能桁架结构中待控制节点位移的最大值达到最小，以结构强度及作动器性态作为约束条件，以作动器电压作为控制变量，建立最优控制模型。对结构进行了机电耦合有限元分析，利用线性压电学原理，导出了结构节点位移及杆件应力与控制电压的关系。模型被转化为序列线性规划问题进行求解。用数值方法模拟了结构位移控制的效果，实例表明该方法在保证强度的同时，能有效控制结构的节点位移，并可处理任意工况多位移要求的情况，这是普通结构通过初始结构设计难以实现的。

Optimum displacement control of piezoelectric adaptive trusses

An optimum control model was constructed, which takes the maximum controlleddisplacement-components of piezoelectric truss as objective, and takes the controlling voltage of actuators as variables, subjects to strength of the structure and characteristic of actuator. The electric-mechanical coupled structure was analyzed by finite element method. By using linear piezoelectricity theory, the relations between nodal-displacement/tension of bar and the controlling voltage was derived. The model was transformed to a sequential linear programming ultimately. The control efficiency of the model was simulated by numerical method. Examples illustrate that this method has ability to control nodal-displacements under the constraint of structural strength. The model can treat arbitrary load cases and control multiple displacement components, which is hard to be realized for general structures.