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Experimental investigation of a uniaxial dielectric elastomer generator

Sikora Wojciech

Acta Mechanica et Automatica

2023

Vol. 17, no. 4

499--506

The widespread use of battery-powered electronic devices creates the need to develop methods to extend their maximum operating time. This can be achieved by using ambient energy, which would otherwise be dissipated. The conversion of energy, usually mechanical energy, into electric energy takes place in energy harvesters. Energy harvester systems based on a dielectric elastomer (DE) are a relatively new field that is being constantly developed. Due to their features, dielectric elastomer generators (DEGs) may complement the currently dominant piezoelectric harvesters. The major feature of employing a hyperelastic material is that it allows relatively large displacements to be utilised for generating energy, which is impossible in the case of piezoceramics. This article presents a DEG designed to operate under uniaxial tensile loads and which has a multilayer structure, describes the general operating principles of a DEG, explains the construction and assembly process of the investigated design and shows the electric circuit necessary to properly direct current flow during the DEG operation. The experimental part consists of two series of tests based on a central composite design (CCD). The objective of the first part was to map a capacitance response surface of the DEG in the selected range of the cyclic mechanical load. The second part concerned the amount of generated energy for the specific load case as a function of operating voltages. The result of the work is the formulation of regression models that allow the characteristics of the presented DEG design to be identified.

Prosthesis design driven by electroactive polymers

Dominik I., Kaszuba F., Dwornicka R.

Czasopismo Techniczne. Mechanika

2013

R. 110, z. 1-M

65--72

Applications of dielectric elastomer (DE) actuators are presented in this paper. Dielectric elastomers (a type of electroactive polymer) are one the most promising smart materials. They consist of two flexible electrodes and a dielectric film between them. After applying voltage (3–5 kV) to the electrodes, the thickness of the polymer layer lowers. Changes of the thickness can be indirectly measured , enabling the element to work as a sensor. A self-sensing and energy harvesting elements are also described. Two applications are described – an active orthosis and a force feedback device.

W artykule przedstawione są zastosowania siłowników opartych na elastomerach dielektrycznych. Materiały te są jednym z najbardziej obiecujących przedstawicieli materiałów inteligentnych, a dokładniej – polimerów elektroaktywnych. Składają się z dwu podatnych elektrod i warstwy polimerowego dielektryka pomiędzy nimi. Po przyłożeniu napięcia aktywacji (ok. 3–5 kV) zmniejsza się grubość tej warstwy. Ta zmiana grubości może być mierzona w sposób pośredni, co pozwala na pracę element jako czujnika. Opisano tryb jednoczesnej pracy siłownikowo-czujnikowej i magazynowania energii. Dwa zastosowania zostały szczegółowo opisane: aktywny wyciąg ortopedyczny palca i urządzenie do siłowego sprzężenia zwrotnego.