Coordination Funds

协调基金

• 批准号: 470900675
• 负责人: Professor Dr.-Ing. Bernd Henning
• 金额: --
• 依托单位: Fachgebiet Elektrische Messtechnik (EMT)
• 依托单位国家: 德国
• 项目类别: Research Units
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/470900675?language=en
• 关键词: Coordination; Funds

Ultrasonic sensors and actuators are used in a wide range of applications in science and technology. In the design and optimization of these components, computer technology is increasingly used. One of the problems in this procedure is the insufficient knowledge of the acoustic or electromechanical material properties of the piezoelectric materials or the manufactured piezoelectric components. According to the current state of the art, these material properties are determined using several differently processed material samples, with the result that the material parameter set is inconsistent.This applies in particular to the characterization of piezoceramic materials applied in the higher power range, for example in high-power ultrasonic applications where the nonlinear properties of the materials must be taken into account. The dissipative properties of piezoelectric materials due to damping must also be considered.The following are the main objectives for this research project: Measurement methods and measurement systems for the characterization of the thermal and piezoelectric material behaviour of piezoceramic materials are to be developed. Aided by tailored optimization methods, complete and consistent material parameter sets are determined. Measurement methods and measurement systems are developed to enable the determination of the material parameters based on a single piezoceramic sample of a geometry that is typical for high-power applications.To this end, it is necessary to develop suitable material models to describe the nonlinear material behaviour mathematically. In addition, these material models must be suitable to be efficiently implemented in a simulation environment based on the transient discontinuous Galerkin method, which is to be developed within the scope of this project.It should be pointed out that the planed characterization method is based on continuum physical considerations of the behaviour of piezoelectric ceramics. Atomistic, micro-scale effects are considered implicitly via their effective influence on the material behaviour.Since a ban on the use of piezoceramics that contain lead is expected in the future, the provision of a new characterization methodology for piezoceramic materials and the creation of a high-performance simulation environment will support the substitution by lead-free piezoelectric materials, from which small and medium-sized companies in particular will benefit. In addition, it is to be expected that this characterization method will indirectly also have a positive influence on the development of new, highly efficient piezoelectric materials and on the improvement of the manufacturing processes.

超声波传感器和执行器在科学技术中有着广泛的应用。在这些部件的设计和优化中，计算机技术被越来越多地使用。这一过程中的问题之一是对压电材料或所制造的压电元件的声学或机电材料性质的了解不足。根据现有技术，这些材料属性是使用几个不同处理的材料样品来确定的，结果是材料参数设置不一致。这尤其适用于应用于较高功率范围的压电陶瓷材料的表征，例如在必须考虑材料的非线性属性的高功率超声波应用中。本研究的主要目标是：发展用于表征压电陶瓷材料的热性能和压电材料性能的测量方法和测量系统。借助于量身定制的优化方法，确定了完整和一致的材料参数集。为了能够根据一个典型的高功率应用的几何形状的压电陶瓷样品来确定材料参数，开发了测量方法和测量系统。为此，有必要开发合适的材料模型来从数学上描述材料的非线性行为。此外，这些材料模型必须适合于在基于暂态不连续伽辽金方法的模拟环境中有效地实施，该方法将在本项目范围内开发。需要指出的是，计划中的表征方法是基于对压电陶瓷行为的连续介质物理考虑。原子微尺度效应是通过它们对材料行为的有效影响而被隐含地考虑的。由于预计未来将禁止使用含铅的压电陶瓷，提供一种新的压电陶瓷材料的表征方法和创造一个高性能的模拟环境将支持无铅压电材料的替代，特别是中小型公司将从中受益。此外，可以预期，这种表征方法也将间接对新型高效压电材料的开发和制造工艺的改进产生积极的影响。