Accurate and reliable Virtual Point FRFs created with DIRAC are key to successful sound & vibration engineering and are crucial to perform advanced analyses such as Dynamic Substructuring or Blocked Force source characterization.
A virtual point (VP) is an interface used to connect components which allows the engineer to build up, for example, a full vehicle model. The point is “virtual” because typically it cannot be measured directly. By placing sensors around the VP and by assuming the local region behaves rigidly, DIRAC transforms the measured data as if it were measured at the VP.
The Virtual Point includes both translational and rotational degrees of freedom, data which traditionally is impossible to obtain. The transformation also gives valuable insights about the quality of the measured data and the resulting FRF model. Force impacts are transformed in a similar fashion.
Why use Virtual Points?
A truly modular engineering approach requires exact and well defined interfaces between components. Using traditional (software) products, engineers are not able to perform measurements within the interface between two components.
Our unique Virtual Point Transformation changes this:
- Measurement data is transformed as if it were measured at the exact interface location
- It allows to measure FRFs in 6 degrees of freedom (DoF) including rotations, rather than only translations in 3-DoF
- At higher frequencies, e.g. generated by electric drivelines, rotational degrees of freedom are crucial to include because they can have a high contribution in the overall transfer and resulting sound levels
Unique software solution
DIRAC is unique on many fronts, truly outstanding are the intuitive way of guiding engineers during the measurement and the integration of the Virtual Point methodology. With the live quality indicators available in DIRAC, measurements will be done first-time-right.
The Virtual Point transformation allows engineers to couple measured FRFs with simulated FRFs, making reliable full-vehicle models available earlier in the development process.