The natural frequencies of a system are of primary importance when designing dynamically loaded systems. To prevent excessive stresses, strong vibrations, and acoustic issues, specific frequency ranges can be targeted to minimize interactions between components and external excitations.

When calculating natural frequencies of highly complex structures, such as a complete vehicle, we draw on many years of experience, continuously validated against experimental results.

Based on the calculated natural frequencies of a system, modal frequency response analysis can be used to determine the dynamic transmission path from one point to another. These transmission paths describe the structural response in the frequency domain.

As with natural frequency analyses, numerous past projects have given us extensive know-how in this field. In the area of structure-borne sound, we offer analysis of input impedances and transfer functions.

MSC/Nastran is the standard software we use for these analyses, although ABAQUS and ANSYS can also be employed.

Based on the system’s calculated natural frequencies, modal transient response analysis allows the system’s response in the time domain to be determined. If impacts and contacts within the system are negligible, stresses, forces, and displacements can be used to assess the design under a wide range of excitation types.

Typical applications include all types of shaker simulations. In addition to solving structural problems, we also support the definition and design of test stands. Suppliers, in particular, benefit from our expertise in full-vehicle dynamics. Even without complete body structures, entire assemblies can be tested in a realistic dynamic environment.

MSC/Nastran is our standard software for these analyses, with ABAQUS and ANSYS also available as alternatives.

A special case of frequency response analysis is interior acoustics. Here, transfer functions are determined not only for structure-borne sound but also through the air to any desired microphone location. The size and shape of the interior, as well as the properties of interior materials, have additional effects on the results.

MSC/Nastran is our standard software for these analyses, though ABAQUS and ANSYS can also be used.

Another option is the BEAKUS software, based on the Boundary Element (BE) method, which allows calculation of sound radiation in both disturbed and undisturbed environments.

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