The developer of Actran Release 13.0 says this acoustics simulation offers engineers improved performance, new capabilities and ease-of-use features for reducing and optimizing sound in products.
New elements and boundary conditions:
- With support for rigid body elements, users can model rigid connections between different parts and apply required boundary conditions, providing them with modeling flexibility.
- The integration scheme for pyramid elements has been improved to provide a more robust and accurate evaluation of secondary variables such as fluid velocity and intensity.
- Perfectly Matched Layers technology complements the infinite element technology to model non-reflective conditions. This technique is attractive from a computational point of view for high frequencies with an accuracy level comparable to infinite elements.
- Support for semi-empirical Miki formulation lets engineers take advantage of this simple to use formula to model porous materials.
- New boundary conditions are supported in the Actran DGM module including a Thompson condition. It can be used to simulate an excitation from a neighboring acoustic component to take into account installation effects on the acoustic radiation by coupling an Actran computation of the near free field with an Actran DGM computation of the installed far field.
- With support for directive microphone, users can model sensitivity of microphones to the directivity and frequency of incoming acoustic fields.
- Heterogeneous turbulent boundary layers can be used to handle decorrelation effects between parietal pressures along different loaded sub-surfaces
- A diffuse sound field excitation can now be generated by a summation of plane waves in presence of the exterior fluid. The effect of the presence of the structure or surrounding objects can thus be taken into account which improves the fidelity of the numerical model.
- Thanks to the innovative integration method for mapping the vibration levels in a radiation analysis, a coarser acoustic mesh can capture the vibration levels more accurately, reducing the computation time and resources.
- Translate information from Nastran input files into equivalent Actran data blocks, which can save considerable time during pre-processing
- Map CFD results that are either periodic in space or symmetric increasing flexibility for flow interpolations
- Dual-parallelism capability available to combine the benefits of different types of parallelism
Several new result quantities are supported in this release, including indicators such as the Overall Sound Levels and mean value, and t onal character of the signal when plotting octave or 1/3 octave curve.
In addition, enhanced visualization of boundary conditions, such as displacement, rotation, point load and moments, and equivalent beam profile, validation of an analysis, and faster results visualization are some of the features that make Actran VI easier to use for modeling and post-processing. Users can directly listen to the computed sound pressure levels which improves the interpretation of the results, and various enhancements are brought to the picking function of Actran VI. This release also handles names at import /export and read comments from external meshing files.
Filed Under: O&M