| Abstract [eng] |
The aim of this study is to create membranes of different materials, to find the most suitable material that would allow to create the greatest displacement at the first resonant frequency. In this work, different piezoelectric membranes for synthetic jet generators were investigated. The membranes were printed on a 3D printer using fused deposition modeling technology. Eight membranes of thermoplastics were printed for the study, with 45 ° and 90 ° printing directions. Membrane printing materials: polylactide (PLA), acrylonitrile, styrene-polybutadiene copolymer (ABS), polycarbonate (PC), and nylon. For further comparison, a composite membrane of polylactide (PLA) and carbon fiber was printed. The membranes were operated at 5 V and 10 V and displacements were observed at the first resonant frequency. A Polytec laser vibrometer was used to measure displacements. The largest displacement at the first resonant frequency was achieved by a polylactide (PLA) printed membrane. The membrane was printed at 45 ° printing angle, the displacement reached 112.4 nm, when voltage was 5 V, and reached even 214.1 nm, when applied voltage was 10 V, while the displacements of other membranes were smaller. When evaluating the influence of the printing direction, displacements ranged from 14.4 nm to 77.4 nm for unidirectional printed membranes and from 12.2 nm to 101.1 nm for cross-printed membranes at 5 V voltage. Displacements ranged from 52.2 nm to 62.8 nm for unidirectional printed membranes and from 50.1 nm to 214.1 nm for cross-printed membranes at 10 V voltage. In all cases except 5 V applied to polycarborane membranes, the displacements of the crossed membranes were larger. |
