Torsional -- Bending Vibrations Attenuation Using Piezoelectric Elements

使用压电元件衰减扭转-弯曲振动

• 批准号: 9402802
• 负责人: Grzegorz Kawiecki
• 金额: $ 12.86万
• 依托单位: University of Tennessee Knoxville
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-10-01 至 1998-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9402802&HistoricalAwards=false
• 关键词: Torsional; Bending; Vibrations; Attenuation; Using

9402802 Kawiecki The objective of this project is to develop an approach to control torsional and torsional-bending vibrations in structural elements. This problem will be solved using two methods. One of the methods is based on a concept of generating torsional, bending and axial control loads using the extension/compression action of piezoceramic elements distributed over the structural element. The other method is based on a concept of improving the damping characteristics of a structure by using a piezofilm to modify the distribution of shear strain in a viscoelastic layer bonded to a structure. The project involves experimental and numerical investigations. The experimental research will be performed with three different specimentss: (1) a composite beam with an embedded set of piezoelements designed to generate torsional and bending control loads, (2) a thin walled aluminum beam with a set of piezoelements laminated to the walls, and (3) a thin-walled aluminum beam with a set of ACLD elements laminated to its walls. In the analytical work, a finite element code capable of modeling the dynamics of the beams will be developed. The research plan is formulated to allow the correlation of the results obtained at each step to code development with the results obtained at each corresponding step of the experimental investigation. In the control experiments, the piezoelements bonded to the beams will be driven by a simple analog control system based on proportional and derivative control gains. The attenuation effectiveness of torsional bending vibrations will be tested. Eventually, the same system will be used to control finite element models. The degree of correlation with real system behavior will allow the evaluation of the accuracy of the numerical model. ***

9402802 Kawiecki 该项目的目标是开发一种控制结构元件扭转和扭转弯曲振动的方法。 这个问题将使用两种方法来解决。其中一种方法基于利用分布在结构元件上的压电陶瓷元件的延伸/压缩作用来产生扭转、弯曲和轴向控制负载的概念。另一种方法基于通过使用压电膜来改变与结构粘合的粘弹性层中的剪切应变的分布来改善结构的阻尼特性的概念。该项目涉及实验和数值研究。实验研究将使用三个不同的样本进行：（1）带有一组嵌入式压电元件的复合梁，旨在产生扭转和弯曲控制载荷，（2）带有一组层压到壁上的压电元件的薄壁铝梁，以及（3）带有一组层压到其壁上的 ACLD 元件的薄壁铝梁。 在分析工作中，将开发能够模拟梁动力学的有限元代码。 制定研究计划是为了将代码开发的每个步骤获得的结果与实验研究的每个相应步骤获得的结果相关联。 在控制实验中，粘合到梁上的压电元件将由基于比例和微分控制增益的简单模拟控制系统驱动。 将测试扭转弯曲振动的衰减效果。 最终，同一系统将用于控制有限元模型。 与真实系统行为的相关程度将允许评估数值模型的准确性。 ***