Multistable Structures for Broad Bandwidth Vibration-based
Energy Harvesters: An Analytical Design Investigation.
Studienbereich Mechanik, Technische Universität Darmstadt, Darmstadt
[Ph.D. Thesis], (2015)
Available under Creative Commons Attribution Non-commercial No-derivatives 3.0 de.
|Item Type:||Ph.D. Thesis|
|Title:||Multistable Structures for Broad Bandwidth Vibration-based Energy Harvesters: An Analytical Design Investigation|
The field of vibrational energy harvesting aims to transform ambient mechanical energy into electrical energy. For example, this energy can be used to operate autonomous sensor units for structural health monitoring or to supply low power electronic devices. Robust energy harvesters that allow to harvest sufficient energy over a broad frequency range are crucial for these applications. One strategy to increase the bandwidth of energy harvesters and, thus, the robustness is the exploitation of multistable structures. This is due to their feature of showing large amplitude oscillations that result from snap-through actions (inter-well oscillations) in a significant frequency range.
The aim of this thesis is to analyze different multistable energy harvester designs in order to optimize their performance and formulate design criteria. The considered designs are a bistable electromechanical beam, a bistable electromechanical composite plate and a newly proposed design of a multistable plate with four equilibria. Firstly, analytical models for the multistable energy harvesters are presented in order to assess their broad bandwidth harvesting capabilities. Analytical methods are applied to these models to investigate the underlying bifurcation behavior. Based on the analytical investigations, design criteria are formulated to describe the favorable harvesting domain. Numerical simulations are performed to supplement the analytical investigations. The differences of the considered structures are highlighted concerning robust and efficient harvesting by means of numerical simulations for different types of excitation. Experiments are carried out to complement the analytical and numerical analysis. The experiments establish the transferability of the numerical and analytical findings to real-world applications.
|Series Name:||Forschungsberichte des Instituts für Mechanik der Technischen Universität Darmstadt|
|Place of Publication:||Darmstadt|
|Publisher:||Studienbereich Mechanik, Technische Universität Darmstadt|
|Uncontrolled Keywords:||vibration-based energy harvesting; nonlinear energy harvesting; multistable structures|
|Classification DDC:||600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften|
|Divisions:||16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Dynamics and Vibrations
|Date Deposited:||19 May 2016 07:44|
|Last Modified:||19 May 2016 07:44|
|Referees:||Hagedorn, Prof. Peter and Schweizer, Prof. Bernhard|
|Refereed:||16 December 2015|