Passive control of instability regions by means of piezoceramic elements

Abstract The studies on vibration frequency as well as loading capacity of slender systems are very important issues in the design process. Integration of smart materials with the host structures allows one to create constructions which are able to adjust to the different conditions. The piezo material belongs to the smart materials group. Application of voltage to the piezoparts leads to induction of forces which can cause prestressing of the host structure. The prestressing with the use of piezoceramic elements is a main subject of this paper. The investigated system constitutes a column which is loaded with the specific load. The specific load is realized by means of specially designed heads what results in divergence or divergence-pseudoflutter type of characteristic curves. The results presented in this paper are concern on comparison of the loading capacity magnitude and vibration frequency of a slender system with and without prestressing. Finally, it will be stated when to use complex system with piezopart or the simplified one without it.

摘要 细长系统的振动频率与承载能力研究是结构设计过程中的关键课题。将智能材料与主体结构集成，可构建能够自适应不同工况的工程结构。压电材料（piezo material）属于智能材料范畴，对压电组件施加电压可感应产生作用力，进而对主体结构施加预应力。基于压电陶瓷元件的预应力技术是本文的核心研究主题。本次研究的对象为受特定载荷作用的立柱，该特定载荷通过专门设计的加载头实现，由此得到的特性曲线呈现分叉或分叉-伪颤振类型。本文呈现的研究结果，旨在对比有无预应力作用下细长系统的承载能力幅值与振动频率。最终本文将明确，何时应采用集成压电组件的复杂系统，何时可采用无压电组件的简化系统。