Modal Analysis:
No engineer could possibly manage to design a construction, solving all problems due to noise and vibrations without precise knowledge of the inherent properties of a structure. To determine the structure’s properties experimentally the modal analysis offers an excellent tool. vModal provides the engineer with the complete hard- and software equipment necessary to carry out a successful modal analysis or an operating deflection shape measurement.
Structure Analyser:
For the data acquisition part at modal testing, vModal works highly integrated with the multichannel FFT analyser vAnalyzer. The vAnalyser is a complete noise and vibration measurement system capable of using several DAQ Hardware Frontends, depending of the requirements of the tests. There are frontends from 2 to 64+ Channels as USB or LAN solutions available, with frequency ranges from 1Hz up do 80kHz.
Measurement Data
Every measurement will be transferred via the measurement interface to the database. From there they can be recalled for any displaying and editing. Further the measurement interface includes the routines for modal extractions of multi-shaker measurements.
UFF Import for external data
Data from external DAQ systems can be imported as UFF-Files.
For the determination of the modal-Values and for other calculations the following functions are available:
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- SDOF local, global
- MDOF, local, global
- Hand-fit
- Mode-Indicator Function
- Poly Reference
- Synthetic Frequency Response Functions
- Fit Quality Function
- MAC Function
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Simulation
Using the results of the modal analysis, Eigen-frequencies, mode shapes and damping, the engineer will be able to create a mathematical model, suitable for any calculation concerning sensitivity and optimization. A feature to carry out forced response calculations is also integrated.
Verifications of FEM calculations are possible with a special import module for FEM Eigen-vectors.
Operating Deflections
Stationary operating deflections can be measured in the frequency or time domain. For transient vibrations, measurements and ODS in the time domain can be done.
3D-Animation
All results can be displayed as animated shapes. There are wire frame and hidden line models that enable the user to display the results of the operating deflection measurements, the modal analysis and the calculated forced response vibrations.
Reporting
All Graphs and 3D-Animation steps can be exported as wmf-files, copied to clipboard or directly send to the printer. The 3D-Animations additionally can be saved as AVI-Films to be used for replay in the Windows Media Player® or in visual presentations as e.g. in Microsoft PowerPoint®.
