Adaptive Lightweight CFRP Strut for Active Vibration Damping in Truss Structures

Abstract

For the purpose of active damping and suppression of vibration in advanced composite truss structures a new adaptive lightweight strut was developed. It was based upon a previously developed multi-purpose CFRP sandwich strut with integrated load transfer elements. Into this strut. which exhibits excellent mechanical properties related to the structural weight. a piezoceranmic highload stack actuator with an expansion capability of 55 Itm was integrated. A special design using a composite sleeve allows the tailoring of the strut stiffness particularly with respect to high active tension forces. The measurement of the dynamic strut response is provided by a surface bonded and electrically isolated PVDF film sensor. Tests of the adaptive strut in an antenna-supporting composite truss structure established a nearly complete suppression of externally excited disturbing vibrations. Due to the structural concept the new adaptive strut is well suited for active vibration control under high strength and stiffness requirements.

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References

Breitbach, E. B. . R. Lamimiering , J. Melcher and F. Nitzsche . 1994. "Smart Structures Research in Aerospace Engineering'" Proc. of the Second European Coi/ on Smn(rt Strutctures atnd Materials, Glasgow.

Campbell. J. F. , E. G. Vanderheiden and L. A. Martinez . 1992. 'A Multi-Purpose Sensor for Composite Laminates Based on a Piezo-Electric Film': J. of Composite Materials, 26(3).

Freymann. R. and E. Stumper . 1992. "Active Damping Augmentation of Elastomechanical Systems Using Piezoelectric Sensors and Actuators", Proc. of 75th AGARD-SMP-Meeting on Smart Structures for Aircraift aind Spacecarraft. Lindau, Germany, 5-7 Oct.

Lammering, R. and J. Melcher . 1994. "Smart Structures Research at DLR', Proc. of the ESA-ESTEC Int. Symp. ont Advanced Materials.for Lightweight Structures 94. Noordwijk, NL, 22-25 March.

Melcher, J. 1992. "Active Vibration Isolation Using Multifunctional Interfaces and Adaptive Digital Controllers': Proc. of the Third Ift. Conf. on Alaptive Structure.s, San Diego, CA, USA, Nov. 9-11, pp. 388-401.

Melcher, J. , R. Lammering , R. Schutze and H. C. Goetting . 1995. "Adaptive Space Truss Structures-Development, Manufacture, and Experiments", Proc. ojthe Materials and Structures Svtnposiumn (46th IAF Congress), Oslo, Oct.

Schutze, R. 1991. "Entwicklung und Fertigung von Zugund Druckstaben aus Faserverbundwerkstoffen mit hochbelastbaren Krafteinleitungen': Research Report DLR-FB 91-33.

Schutze, R. 1993. "Stab mit integrierten Krafteinleitungen': Patent P 41 35 695.0-90.

Schutze, R. 1994a. "Lightweight Structures Based on CFRP Sandwich Struts and CFRP Connections", Proc. of the ESA-ESTEC tnt. Ss mnp. on Adtlvanced Materials fior Lightweight Structures 94, Noordwijk, NL, 22-25 March.

10.

Schutze, R. 1994b. 'Aktiver Stab mit einer rohrformigen Wandung aus Faserverbundwerkstoff und beidseitig angeordnetem Anschlullelement", Patent P 43 10 825.3-24.

11.

Schutze, R. 1995. "Verbindungshulse", Patent P 44 19 691.1-12.

12.

Spanner, K. and L. Dietrich. 1982. "Piezo-Translatoren", Elektronik 6/26. 3.