Simulating Lateral Modes in FBARs

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Simulating FBARs has long been seen as a challenging subject due to their inherent electromechanical coupling and their relatively large acoustic size. PZFlex allows full 3D models of these devices to be simulated in the time domain, providing a full spectrum of results from a single model. The linked presentation illustrates what can be obtained from 1D, 2D and 3D …

Full Matrix Capture & Total Focusing Method

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The advantage of using a time domain code allows real world experiments to be simulated like for like. Coupled with our highly efficient mechanical solvers allows Full Matrix Capture (FMC) to be carried out in simulation which then can be post-processed using the Total Focusing Method (TFM) to generate the resultant fully focused inspection images. PZFlex offers a wide range …

Low Frequency Sonar

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Housing resonances can significantly affect device performance, in particular at frequencies below 20 kHz where wideband hydrophones and parametric arrays can operate. Resonances can be difficult to predict and may only be detected late in the design cycle. With PZFlex’s highly efficient electro-mechanical solver, ability to generate multi-million element models and wideband results from a single run, it allows complex …

Matching Layer Optimisation

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Designers often prefer to run multiple simulations to explore the best solution within a design space in order to meet client specifications. PZFlex is very well suited to carrying out such design studies given its ability to deliver high performance designs in short timescales. In combination with our PZFlex Cloud service, models can be simulated in batches or in parallel …

Transducer Heating

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Subjecting transducers to high input powers can generate significant temperature rises within the device. The resultant temperature depends on the thermal properties of the materials used, efficiency of the transducer and the operating environment. PZFlex separates the design problem into an acoustic simulation to calculate losses which can be input into a thermal model to solve for the temperature gradients. …

Stacked Horn Transducer

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Typical PZFlex models are generated on standard partition mesh which is why the code is very quick to run. However we can also model using general connectivity and skewed elements for more complex geometries. The stacked horn example uses a skewed grid to accurately represent the curved tip features. The horn was modeled with: 6 discs of PZT4D connected electrically …

Composite Fibre Reinforced Plastic Structures

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Carbon Fibre Reinforced Plastics (CFRP) and other high strength composite materials offer designers a wide range of performance benefits. However, a major barrier to the use such materials is the cost and complexity of inspection. PZFlex is capable of simulating ultrasonic wave propagation through complex CFRP laminates, allowing new inspections to be developed more rapidly. The complex CFRP weave is …

Acoustic Radiation Force

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Healthy tissue can be distinguished from lesions through mechanical response of the tissue. PZFlex decouples the problem into two parts: acoustic beam model that calculates ARFI stresses and then simulates the force model that uses ARFI calculations as boundary conditions. The simple 2D model is set up with a spherical lesion in a tissue-like material. Resources Acoustic Radiation Force Presentation

2D Fibre Composite Inspection

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Performing spot NDE inspections on large structures can be time consuming and can miss critical defects. The use of Lamb modes is an efficient method of inspecting large, thin structures such as skins. Fibre reinforced composites are used extensively in aerospace applications and exhibit greater complexity with Lamb mode propagation than typical isotropic materials. The 2D models simulate the generation …

Capacitive micromachined ultrasonic transducers (cMUTs)

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Micro-machined Ultrasonic Transducers are sophisticated devices which must take into account 3D effects, multiple element types and nonlinear performance. The capabilities of PZFlex is demonstrated by the simple 2D axisymmetric CMUT model which is setup with a variety of design conditions: an initial bias voltage under atmospheric pressure using contact elements to allow Collapse mode operation and shell elements for …