Performance Advantages and Resonance Analysis of a Variable Speed Rotor Using Geometrically Exact Beam Formulations

Author:

Chandrasekaran Ruthvik1,Hodges Dewey H1

Affiliation:

1. The Daniel Guggenheim School of Aerospace Engineering Georgia Institute of Technology, Atlanta, GA

Abstract

The efficiency and operating envelope of rotorcraft are constrained by the speed of the rotor. Most helicopters operate with a constant rotor speed. Varying the speed of the rotor based on the operating condition could significantly improve the rotor's performance. In this study, a hingeless rotor model with elastic blades is built-in DYMORE to study various aspects of variable speed rotor technology. The rotor blades are modeled as one-dimensional beams using state-of-the-art beam theory known as the geometrically exact beam theory. An unsteady aerodynamics model with dynamic stall and finite-state dynamic inflow is used to obtain the aerodynamic loads acting on the rotor. The power savings that can be achieved at various advance ratios by varying the speed of the rotor is evaluated. Maximum power savings of 41% was achieved at a nominal advance ratio of 0.2. However, changing the rotor speed leads to vibration issues when a rotor blade passes through a resonance point. A methodology to identify the important resonance points for a given flight condition and rotor speed transition is also provided. The forces acting on the rotor blade during resonance crossings at different advance ratios are evaluated. It is found that the amplitude increase during resonance crossing is strongly dependent on the amplitude of the cyclic pitch angles during resonance.

Publisher

AHS International dba Vertical Flight Society

Cited by 5 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Time‐Frequency Analysis of Experimental and Analytical Rotor Thrust during a Rotor Speed Change;Journal of the American Helicopter Society;2024-07-01

2. A Comprehensive Model of Variable Pitch Electric Propulsion Unit for Optimal-Power Thrust Control;IEEE Transactions on Aerospace and Electronic Systems;2024-06

3. Free Vibration Analysis of Accelerated Helicopter Rotor Blade;2023 10th International Conference on Recent Advances in Air and Space Technologies (RAST);2023-06-07

4. Load Reduction During Resonance Crossing of a Variable-Speed Rotor;Journal of Aircraft;2023-01

5. Transient Aeroelastic Response of a Rotor During Rotor Speed Transition in Forward Flight;Journal of Aircraft;2022-07

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