Abstract
This paper investigates the effectiveness of a resonance avoidance concept for composite rotor blades featuring extension–twist elastic coupling. The concept uses a tendon, attached to the tip of the blade, to apply a proper amount of compressive force to tune the vibration behavior of the blade actively. The tendon is simulated by applying a non-conservative axial compressive force applied to the blade tip. The main load carrying part of the structure is the composite spar box, which has an antisymmetric layup configuration. The nonlinear dynamic behavior of the composite blade is modelled by using the geometrically exact fully intrinsic beam equations. The resulting nonlinear differential equations are discretized using a time–space scheme, and the stationary and rotating frequencies of the blade are obtained. It is observed that the proposed resonance avoidance mechanism is effective for tuning the vibration behavior of composite blades. The applied compressive force can shift the frequencies and the location at which the frequency veering take place. Furthermore, the compressive force can also cause the composite blade to get unstable depending on the layup ply angle. Finally, the results, highlighting the importance of compressive force and ply angle on the dynamic behavior of composite blades, are presented and discussed.
Highlights
Vibration behavior of rotating blades is key in the design of such rotating structures
This paper assessed the performance of a resonance avoidance concept for composite blades
The concept used a tendon, attached to the tip of the blade, to apply a compressive force. This compressive force actively changed the dynamic behavior of the blade
Summary
Vibration behavior of rotating blades is key in the design of such rotating structures. The effect of intermediate support on the stability of cantilever beams subjected to non-conservative loading was studied by Abdullatif and Mukherjee [8] They showed that the critical follower force could jump due to the frequency veering. Amoozgar et al [18] and Amoozgar and Shahverdi [19] studied the vibration and aeroelastic behavior of composite fully or partially curved blades using exact fully intrinsic beam equations They considered various layup configurations and showed that the blade curvature could affect the dynamics and aeroelastic stability of the blade through introducing additional coupling to the system. TThhee bbllaaddee lleennggtthh aanndd rroottaattiinngg ssppeeeedd aarree ddeennootteedd bbyy LL aanndd ΩΩb rreessppeeccttiivveellyy..IIttiissaassssuummeedd tthhaatt tthhee mmaaiinn llooaadd ccaarrrryyiinngg ppaarrtt ooff tthhee ssttrruuccttuurree iiss tthhee ccoommppoossiittee ssppaarr wwhhiicchh iiss aa rreeccttaanngguullaarr bbooxx ((FFiigguurree 11cc)). SScchheemmaatitcicoof fththeerortoattaintigngcocmompopsoitseitbelabdlaedseusbujebcjteecdtetdo ttohethteentdeonndoinndiuncdeudceadxiaalxfioalrcfeo:r(cae): (uan) duenfdoermfoermd estdatseta, t(eb,)(tbe)ntdeonndoinndiuncdeudcecdomcopmrepsrseivsseivfoerfcoer,c(ec,)(cco)mcopmospiotesistpeasrp-abro-xbosxecsteioctni.on
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