ForschungListe aller Forschungsprojekte
Topology optimization of nano piezo/flexoelectric structures for energy harvesting applications

Topology optimization of nano piezo/flexoelectric structures for energy harvesting applications

Leitung:  X. Zhuang
Team:  Nanthakumar Srivilliputtur Subbiah
Jahr:  2016

Energy harvesters convert the ambient vibration into useful electrical energy. The energy harvesting ability of a structure is characterised by the energy conversion factor, which is the ratio of electrical energy and mechanical energy under external mechanical vibrations.

The developments in nanotechnology has lead to the field of Nano Electro Mechanical Systems (NEMS). Nano scale energy harvesting devices with nano sized piezoelectric layers have also become a possibility, where the surface elastic and surface piezoelectric effects become dominant.

The topology of the nano piezoelectric layer in a nano energy harvester can be optimized. The project aims to devise a computational framework to maximize the energy conversion factor as well as durability. The topology optimization in this project is performed by using level set based optimization method. The level set function corresponding to the global optima defines the topology of the piezo/flexoelectric layer that maximizes energy conversion. The project starts with optimization under static loads and will be further extended to harmonic loads.

Figure 1. Evolution of topology and the corresponding level set function towards global optima.

Reference:

  1. S. S. Nanthakumar, T. Lahmer, X. Zhuang, H. S. Park, T. Rabczuk, Topology optimization of piezoelectric nanostructures, Journal of the Mechanics and Physics of Solids 94 (2016) 316-335. http://dx.doi.org/10.1016/j.jmps.2016.03.027