Conference paper
Systematic design of 2D and 3D VibroAcoustic Fluidic Cavity Sensors Using Topology Optimization
Acoustic Technology, Department of Electrical and Photonics Engineering, Technical University of Denmark1
Department of Electrical and Photonics Engineering, Technical University of Denmark2
Centre for Acoustic-Mechanical Microsystems, Centers, Technical University of Denmark3
Solid Mechanics, Department of Civil and Mechanical Engineering, Technical University of Denmark4
Department of Civil and Mechanical Engineering, Technical University of Denmark5
In this research we investigate a novel sensor concept, which utilizes a standing acoustic wave inside a liquid-filled cavity to probe volumetric properties of a fluid analyte. However, realizing a high-Q cavity resonator is a challenge because of low acoustic impedance contrast between liquids and solids.
In our previous studies, we surround the cavity resonator with phononic crystal layers that provide a strong cavity resonance within the phononic band gap. The quality factor drastically depends on the geometry of the metamaterial lattice. Therefore, the main aim of this study is to find an optimal material layout of the solid domain around the cavity by employing topology optimization.
We formulate the optimization problem as maximization of the Q-factor of the cavity resonance. We consider the sensor as a fully coupled vibroacoustic system, taking into account material losses and frequency-dependent material properties. Since resonance problems are very sensitive to minor variations in geometry, we apply a gray scale suppression constraint to minimize the influence of geometrical uncertainties and make the optimized designs suitable for additive manufacturing.
| Language: | English |
|---|---|
| Year: | 2023 |
| Proceedings: | Noise and Vibration |
| Types: | Conference paper |
| ORCIDs: | Belahurau, Yauheni , Aage, Niels , Christiansen, Rasmus Ellebæk and Lucklum, Frieder |
