Magnetic shape-memory alloys as active materials for vibration damping

基于压电陶瓷或磁致伸缩合金的固态致动器具有高刚度，但只能产生低位移。因此，它们注定用于在刚性结构中引入强力，例如用于在较高频率下的主动振动阻尼。然而，磁性形状记忆合金（MSM合金）的特征在于明显较低的刚度，但也具有相当高的应变。通过这种方式，它们将允许它们的应用，例如在低频下作为动态吸收器，而不需要位移放大系统。此外，MSM合金独特的材料阻尼可能支持多功能减振器的创新概念。基于申请人在使用活性材料的振动阻尼领域的丰富经验，在本研究项目中，将从理论和实验上分析MSM材料的特性以及实现用于振动阻尼的新型MSM致动器的适当概念。在这一点上，杆状块体和复合材料是特别感兴趣的。优先计划使材料科学家能够密切合作。通过这种方式，将创造最佳条件，以促进为减振的科学和经济应用领域制定最佳MSM解决方案。

Solid-state actuators on the basis of piezoelectric ceramics or magnetostrictive alloys possess high stiffness, but are only able to create low displacements. Therefore they are predestined for the introduction of strong forces in stiff structures for example with the purpose of an active vibration damping at higher frequencies. Magnetic shape memory alloys (MSM-alloys), however, are characterised by a clearly lower stiffness, but also a considerably higher strain. Through this they would allow their application for instance as dynamic absorbers at low frequencies without requiring a displacement amplification system. In addition the distinctive material damping of MSM-alloys might support the innovative concept of a multifunctional vibration damper. Based on the applicant s substantial experiences in the field of vibration damping with active materials, in this research project the properties of MSM-materials as well as appropriate concepts to realise a new type of MSM-actuators for vibration damping will be analysed theoretically and experimentally. In this connection rod-shaped bulk and composite materials are of particular interest. The Priority Programme enables a close cooperation with material scientists. In this way optimal conditions will be created to facilitate the elaboration of the best MSM solutions for the scientifically and economically interesting application area of vibration damping .