摘要
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。
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.
出处
《强度与环境》
2006年第2期39-44,57,共7页
Structure & Environment Engineering
基金
国家自然科学基金(10472003)
北京市自然科学基金(3042002)
北京市教委(KM200410005019)
关键词
智能结构
位移控制
机电耦合
最优化
adaptive structure
displacement control
electric-mechanical coupling
optimization
