Multiphysics modelling and experimental validation of an air-coupled array of PMUTs with residual stresses

Massimino, Gianluca; Colombo, Alessandro; Dalessandro, L.; Procopio, F.; Ardito, Raffaele; Ferrera, Marco; Corigliano, Alberto

doi:10.1088/1361-6439/aaaf78

Cited by 20 publications

(21 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 10 shows an example of result comparison. Massimino et al [26] also obtained satisfactory results when comparing his 3D model and 2D…”

Section: Meshing In Acoustic Analysismentioning

confidence: 73%

“…If FLUID129/130 is set on non-circular/spherical exterior, some waves will be reflected when it hits the acoustic boundary. The ABC wave absorption method is viable, and this is confirmed from simulation done be Massimino et al [26]. He used FLUID130 as the wave absorption boundary for his simulation which has a quarter hemisphere acoustic domain and obtained satisfactory sound pressure level (SPL) results (Appendix A).…”

Section: Absorbing Boundary Condition (Abc)mentioning

confidence: 75%

“…Figure 9 shows an example of model reduction. in hemispherical acoustic domain [26] According to Howard and Cazzolato [34], using ANSYS Workbench, symmetry boundary condition can only be set to elements with displacement DOF. This means that it is not possible to set symmetry boundary condition to acoustic elements which mostly only have pressure DOF instead of displacement DOF.…”

Section: Meshing In Acoustic Analysismentioning

confidence: 99%

“…Massimino et al [26] had done a quarter model of piezoelectric micromachined ultrasonic transducer (PMUT) using ANSYS 17.2 as shown in Figure 9. However, he never mentioned In researches involving the use of finite element simulation, 2D model is preferred over 3D model for its minimal use of computational resource and significantly lower computation time [35].…”

Section: Meshing In Acoustic Analysismentioning

confidence: 99%

“…However, 2D model may produce less accurate result compared to 3D model as it effectively assumes that the model extends infinitely in one axis. For this reason, 3D model and 2D model is often compared with experimental results before proceeding with simulation of case of interest [26] [36]. Figure 10 shows an example of result comparison.…”

Section: Meshing In Acoustic Analysismentioning

confidence: 99%

See 4 more Smart Citations

UQ eSpace

Azizi¹

View full text Add to dashboard Cite

Simulation which incorporates numerical method is practical in investigating the effect of ultrasonic excitations on the acoustic pressure and flow patterns of fluid with arbitrary settings as it can produce reliable results in a relatively short time even for complex cases. This thesis aims to develop efficient simulation of acoustic pressure field generated by ultrasonic transducer using ANSYS Workbench to obtain accurate data of the resulting flow and pressure fields for harmonic ultrasonic excitations. Simulation methodology is developed from reviewing literatures and it is used as a basis to simulate and replicate results from two distinct literatures for validation purpose. An arbitrary simple case is simulated to gauge the effectiveness of simulation made based on the established simulation methodology in investigating acoustic pressure field. Through these processes, the following are concluded: • Computation effort increases with higher number of degrees of freedom (DOF) of nodes involved in solving process. • Mesh quality should be decent, and the element size should follow the meshing guidelines to ensure accurate results. • Appropriate assumption of boundary conditions of experimental setup is important to ensure feasibility of simulation results. • Simple simulation model is better than complex model in both result accuracy and computation time when there is insufficient information on the case to be simulated. • Model reduction via plane/axis of symmetry and use of 2D/2.5D models should be prioritised for fast and accurate simulation.

show abstract

“…Figure 10 shows an example of result comparison. Massimino et al [26] also obtained satisfactory results when comparing his 3D model and 2D…”

Section: Meshing In Acoustic Analysismentioning

confidence: 73%

Section: Absorbing Boundary Condition (Abc)mentioning

confidence: 75%

Section: Meshing In Acoustic Analysismentioning

confidence: 99%

Section: Meshing In Acoustic Analysismentioning

confidence: 99%

Section: Meshing In Acoustic Analysismentioning

confidence: 99%

See 3 more Smart Citations

UQ eSpace

Azizi¹

View full text Add to dashboard Cite

show abstract

Low frequency Piezoelectric Micromachined Ultrasonic Transducers optimized for concrete structures.

Sammut,

Gatt,

Borg

2023

ce papers

View full text Add to dashboard Cite

Embedded sensors operating within a reinforced concrete structure enable the timely detection of structural degradation causes, such as chloride ions present in the pore solution. The best communication protocol to use for inter‐device communication within the concrete structure would ideally be wireless such as an ultrasonic system. Concrete is a composite material which imposes constraints on ultrasonic transmission, especially when operating at frequencies above 100kHz where incident radiation is scattered by the aggregate. Furthermore, for an effective coupling mechanism, a liquid with high acoustic impedance is required to reduce energy reflection at the interface. This paper outlines the design, construction, and characterisation of a range of Piezoelectric Micromachined Ultrasonic Transducers (PMUTs) which are specifically designed to operate in liquids, at frequencies near or below 100kHz. The PMUT devices described in this paper have diaphragm diameters ranging between 550μm and 2,000μms which sizes are needed for PMUTs to resonate at the required low frequency. This paper outlines the device geometry calculations and the design and fabrication of the prototype devices. The resonant frequencies were determined using a laser vibrometer.

show abstract