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CASSEM meeting – EADS Paris

CASSEM meeting – EADS Paris. Active Structures Laboratory www.ulb.ac.be/scmero. Arnaud Deraemaeker. Motivations. To be able to predict the closed-loop performance for collocated systems Important for structures not tested on ground (satellites …). Principle of collocated control.

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CASSEM meeting – EADS Paris

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  1. CASSEM meeting – EADS Paris Active Structures Laboratorywww.ulb.ac.be/scmero Arnaud Deraemaeker

  2. Motivations • To be able to predict the closed-loop performance for collocated systems • Important for structures not tested on ground (satellites …)

  3. Principle of collocated control • Unconditional stability • Performance = distance pole-zeros of open-loop transfer function • Zeros are the most difficult to predict (very sensitive to local strain distribution for piezo patches)

  4. Available test structures • Composite plate with piezo ceramics (d31-d32) • Composite plate with macro fiber composites (MFC) • Boom with MFC

  5. = 0 Piezo patch Base plate Test structure 1 Actuator

  6. (sensor) (sensor) (sensor) Experimental / numerical results Experimental FRF between p1 and pi Numerical FRF between p1 and pi

  7. Test structure 2

  8. Macro Fiber Composites

  9. Experimental / numerical results

  10. Test structure 3

  11. Numerical results

  12. Crucial points for the modeling of collocated piezo systems • Composite material properties play an important role on the poles of the structure • Actuator properties (d31, d32 as well as mechanical) play an important role on the zeros • Modeling of excentricity (mid-plane) is important for the modeling of the zeros

  13. What is needed ? • Mechanical properties of composite • Mechanical / electrical properties of PZT patches • Mechanical / electrical homogeneized properties of the MFCs : this is a difficult problem ! • Can you provide this information ?

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