Active Rotating Beams
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From this chapter onwards, we will address the active twist rotor using piezoelectric actuation. The helicopter rotor blades can be considered as a closer approximation to rotating beams due to their high aspect ratios. However, the structural dynamic and aerodynamic behavior are highly coupled for helicopter rotor blades. To obtain an idea about the physics behind the active twist concept and to validate the formulation and analysis developed in the previous chapter, aerodynamic loads are not included in this chapter and the effect of time varying tip loads on the dynamic behavior of rotating rectangular section beams is studied. Introduction to the theory of rotating beams is given in Sect. 8.1. Section 8.2 describes the model selected for the dynamic analysis of rotating beam. In Sect. 8.3, the bending actuation mechanism is investigated. Section 8.4 presents the analysis utilizing torsion actuation and discusses its effect on beam response. Section 8.5 discusses the importance of nonlinear terms by applying a tip sinusoidal load in the framework of torsion actuation. A similar study, in the framework of bending actuation is presented in Sect. 8.6. Section 8.7 highlights the effect of torsion actuation on a pretwisted beam. Lastly, important findings are summarized in Sect. 8.8.
KeywordsRotor Blade Piezoelectric Actuation Rotation Speed Increase Torsion Response Piezoceramic Actuation
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