Visual Modal analysis (VMA)
Motion Scope Tracker VMA (software)
Welcome to the 21st century of modal analysis!
VMA (visual modal analysis) is a module for the Motion Scope tracker which enables frequency domain analysis, real live tracking and visualization of modal and operational deflection shapes.
The specifics of the VMA analysis allow for increased displacement resolutions beyond mere hundreds of a pixel. Typical displacement amplitude resolution is in the range of a 1/10000 of a pixel and is as such state-of-the-art, allowing for high 1000x - 10000x motion magnifications! Ten-thousands of a pixel translate to less than 100 nm resolution for a 1 m field of view. The high (sub-micron) resolution is critical for observations of higher frequency mode shapes (1000+ Hz), due to a trend of decreasing displacement amplitudes with frequency.
For more on general motion tracking and displacement measurements (DIC) check out TECHNOLOGY / Displacement measurements
How does VMA compare to existing modal analysis approaches?
Since tracking is done non-contact, there is no mass loading of the measured structure!
Thousands of spatial points (full field) are measured synchronously in one go.
The measurement set-up is fast and simple with minimal to no structure preparation - no need to place sensors and sort out wiring, no programming of scanning patterns...
Tracking produces easy to visualize 2D results.
Smart aliasing - high frequencies with low frame-rates!
Smart aliasing is a technique developed by Motion Scope for high frequency measurements above the camera's Nyquist limit. It relies on using a shaker with a controlled excitation set by the Motion Scope tracker VMA software.
Check out why, what and how in TECHNOLOGY / Smart aliasing
Real-time tracking at thousands of fps!
When using our high-speed systems, point tracking can be performed in real-time. Certain cameras allow for tracking at thousands of Hz (3000+ Hz). Simply click a point on the live image and see the displacement and spectrum.
Impact response of a cutting blade:
Full analysis overview (playback, tracking, plots, temporal motion magnification, filtering, frequency domain motion magnification):
Electronic circuit excited with a shaker, frequency domain, resonant frequencies of various components:
You will find some of the above examples as well as many more in GALLERY / VMA examples