FULCRUM + FFT MODULE
Combination of the Fulcrum and the FFT module
The combination of the new Vic-3D FFT-Module and the known synchronisation/trigger device with the Fulcrum module of isi-sys / Correlated Solutions for Vibrocorrelation permits full modal and vibration analysis using conventional low-speed cameras. It can be applied to objects with high-frequency excitation, which can replace High-Speed (HS) cameras, when conventional shakers are used for excitation.
Excitation signal
A periodic vibration signal with a wide frequency spectrum (e.g. chirp, fast sweep) is applied to a structure via an electrodynamic, hydraulic or piezo shaker. The cameras of a stereoscopic system are set to a short exposure duration (we use 200μs here), and they are triggered through the Fulcrum module of Vic-Snap.
The excitation signal is shown in the images on the system. A pulse is generated by the function generator for each cycle of the excitation (chirp) signal and connected to the synchronisation device.
The cameras are triggered through the standard synchronisation/trigger device DAQ-STD-8D, controlled by the Fulcrum Module of Vic-Snap/ Vic-3D.
FFT Module Evaluation Examples
The results are shown in the workspace of the FFT Module in Vic-3D with amplitude and phase. Shifting the frequency value in the graphs below (amplitude or phase vs frequency) permits to selection of the corresponding mode shape for any analysed frequency. The amplitudes are displayed as a 3D plot, other options include, e.g. generation of animated videos of the mode shape vibration.
Reviews
There are no reviews yet.