Is there any experimental method to validate the numerical results that obtained from the simulation of rotating blade (flapwise and chordwise vibration) ?
Hi Ahmed
Take a look at this video
https://www.youtube.com/watch?v=RYuzWoZKjEA
http://www.polytec.com/pl/products/vibration-sensors/scanning-vibrometers/psv-a-440-optical-derotator/
If you have a scanning laser but no derotator, I guess you can program it to follow a slowly rotating object.
Sincerely
Claes
You can use photogrammetry or strain gauge. The first has the advantage that you don't need to transfer signal from rotating to non rotating frame. You can find some infos and references here:
Conference Paper Photogrammetric Detection Technique for Rotor Blades Structu...
I think you need strain gauge and slip ring. It is the most convenient way to achieve your goal. You just need to stick the gauges on the desired position of the blade and assemble the slip ring between the rotor and stator. Then connect the gauges and ring by wires.
If you use strain gauges pay attention to the fact that you must reconstruct tip deflection from strain signals (it requires multiple strain gauges)
thank you all, I think I will follow the suggestion of Wenzhong Yan. using strain gauge but first I need to figure out how to get data from the gauges.
Jacopo Serafini could you please explain more. thanks
thank you, Claes Richard Fredö
What you mean with how to get data from gauges? You mean how to transmit data from rotating to non rotating frame, or how to reconstruct tip deflection from strain gauge signal?
Building the blade deflection from strain signals is often called Strain Pattern Analysis, or "SPA". Practically, the way SPA is applied largely depends on the studied structure.
Briefly, it is not advised to integrate the strain to get the displacement. You should prefer calculating the blade deflection by combining several shapes. These shapes are obtained experimentally and actually form a vector basis. This basis can be either a set of static shapes, or modal shapes, or even a mix of the 2. The coefficients of the combination are obtained using the strain signals recorded during your main experiment and the strains obtained when recording the basis.
As any other measurement mean, SPA has its advantages & limitations. You should find on the web without too much difficulties some information about it.
You may use an optical derotator. Look for Details into publications of Prof.Dr. Ettemeyer.
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