Phononic Crystals

April 17, 2018By Jeff DobsonPresentations No Comments

Phononic crystals are synthetic materials that are formed by periodic variation of the acoustic properties of the material (i.e., elasticity and mass). One of the main properties of the phononic crystals is the possibility of having a phononic bandgap. A phononic crystal with phononic bandgap prevents phonons of selected ranges of frequencies from being transmitted … Read More

Tonpilz Transducer Simulations

April 17, 2018By Jeff DobsonPresentations No Comments

Tonpilz devices are able to achieve a combination of low frequency and high sensitivity in a compact footprint which makes them ideal as projectors for sonar applications. OnScale can accept models from CAD as well as generating models from simple wizards which makes modelling a single or a multi stack array very straight-forward. With our … Read More

Capacitive micromachined ultrasonic transducers (cMUTS)

April 17, 2018By Jeff DobsonPresentations No Comments

Micro-machined Ultrasonic Transducers are sophisticated devices which must take into account 3D effects, multiple element types and nonlinear performance. The capabilities of OnScale 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 … Read More

2D Fibre Composite Inspection

April 17, 2018By Jeff DobsonPresentations No Comments

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 … Read More

Carbon Fibre Reinforced Plastic Structures

April 17, 2018By Jeff DobsonPresentations No Comments

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. OnScale is capable of simulating ultrasonic wave propagation through complex CFRP laminates, allowing new inspections to be developed more rapidly. … Read More

Stacked Horn Transducer

April 17, 2018By Jeff DobsonPresentations No Comments

Typical OnScale 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 … Read More

Transducer Heating

April 17, 2018By Jeff DobsonPresentations No Comments

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. OnScale separates the design problem into an acoustic simulation to calculate losses which can be input into a thermal model to … Read More

Matching Layer Optimisation

April 17, 2018By Jeff DobsonPresentations No Comments

Designers often prefer to run multiple simulations to explore the best solution within a design space in order to meet client specifications. OnScale 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 OnScale Cloud service, models can be simulated … Read More

Low Frequency Sonar

April 17, 2018By Jeff DobsonPresentations No Comments

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 … Read More