Multi-disciplinary optimization of variable rotor speed and active blade twist rotorcraft: Trade-off between noise and emissions

Polyzos, Nikolaos D.; Vouros, Stavros; Goulos, Ioannis; Pachidis, Vassilios

doi:10.1016/j.ast.2020.106356

Cited by 13 publications

(7 citation statements)

References 27 publications

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“…This strategy is an expansion of the approach introduced by Goulos et al [16] and later adopted in Refs. [17,18,40].…”

Section: Design Space Exploration and Optimizationmentioning

confidence: 99%

“…This is done through a generic function y(x) approximated with ỹ(x) in the form of ỹ(x) = µ − z(x). This combines a regression model µ and a correlation model z(x) [41], where an exponential function is employed [16,17].…”

Section: Design Space Exploration and Optimizationmentioning

confidence: 99%

“…It was concluded that the All-Up-Mass (AUM) and mission profile highly affect the potential benefits of the investigated technologies. Polyzos et al [17] explored the impact of VRS with ABT on ground noise and NO X emitted for a twin-engine light helicopter in descending flight.…”

mentioning

confidence: 99%

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On the Effects of Optimal Implementation of Variable Rotor Speed and Power Management on Hybrid-Electric Rotorcraft

Saias

Goulos

Pachidis

et al. 2023

Journal of Engineering for Gas Turbines and Power

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The concept of Variable Rotor Speed (VRS) has been recognized as an efficient means to improve rotorcraft operational performance and environmental impact, with electrification being a potential technology to further contribute to that. This paper explores the impact of optimal implementation and scheduling of VRS and power management strategy for conventional and hybrid-electric rotorcraft on energy, fuel, and emissions footprint. A multidisciplinary simulation framework for rotorcraft performance combined with models for engine performance and gaseous emissions estimation is deployed. A holistic optimization approach is developed for the derivation of globally optimal schedules for combined rotor speed and power split targeting minimum energy consumption. Application of the derived optimal schedules at mission level resulted to a 6% improvement in range capability for the VRS tilt-rotor relative to its conventional counterpart. For the hybrid-electric tilt-rotor, combined optimization of VRS and power management leads to an increase in range to 18.4% at 40% and 25% reduced payload for current (250 Wh/kg) and future (450 Wh/kg) battery technology, respectively. For representative Urban Air Mobility (UAM) scenarios, it is demonstrated that the VRS concept resulted in up to 10% and 14% reductions in fuel burn and NOX relative to the nominal rotor speed case, respectively. The utilization of the combined optimum VRS and power split schedules can boost performance with reductions of the order of 20%and 25% in mission fuel/CO2 and NOX at a reduced payload relative to the conventional tilt-rotor.

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“…This strategy is an expansion of the approach introduced by Goulos et al [16] and later adopted in Refs. [17,18,40].…”

Section: Design Space Exploration and Optimizationmentioning

confidence: 99%

Section: Design Space Exploration and Optimizationmentioning

confidence: 99%

See 1 more Smart Citation

On the Effects of Optimal Implementation of Variable Rotor Speed and Power Management on Hybrid-Electric Rotorcraft

Saias

Goulos

Pachidis

et al. 2023

Journal of Engineering for Gas Turbines and Power

Self Cite

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“…The flow domain around rotor blades is determined using a CFD solver, and an integral method is employed to depict how the acoustic signals propagate to the far-field. The Kirchhoff method [1,2], the Impermeable Surface Ffowcs Williams-Hawkings (IS-FWH) equation [3][4][5], and the Penetrable Surface Ffowcs Williams-Hawkings (PS-FWH) equation [6,7] are the three most representative approaches for noise propagation.…”

Section: Introductionmentioning

confidence: 99%

Aeroacoustic modeling of helicopter transonic rotor noise

Vigevano

2022

Aerospace Science and Technology

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“…There has been a distinguished progress in OBC with various concepts [14,15]. Active leading-edge slat [16], active control trailing-edge flaps (ACF) [17,18], active twist rotor (ATR) [19][20][21], active gurney flap [22], active camber [23,24], etc. have been studied.…”

Section: Introductionmentioning

confidence: 99%

Optimal Segment Control of Active Twist Rotor for Power Reduction in Forward Flight

2021

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The segment control of active twist rotor is investigated to evaluate the effectiveness in rotor power reduction. A numerical model for predicting the isolated rotor power and loads in steady level flights is deployed and validated. A parametric sweep of the amplitude and phase angle for uniform single-harmonic active twist control is conducted to demonstrate the mechanism of active twist control in rotor power reduction. The optimal control schedules and segment layouts of the segment twist control for power reduction while considering saturation limits are obtained using an optimization framework based on genetic algorithm. Up to 5-seg configuration is considered. The results indicate that the segment twist control reduces the rotor power more than the uniform twist control by applying divergent control schedules to each segment. The load distribution of the rotor disk is harmonized in both circumferential and spanwise directions. The 2-seg and 3-seg control configurations are appropriate, while the configurations with more segments yield limited benefits and they may be penalized with an increase in system complexity.

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Multi-disciplinary optimization of variable rotor speed and active blade twist rotorcraft: Trade-off between noise and emissions

Cited by 13 publications

References 27 publications

On the Effects of Optimal Implementation of Variable Rotor Speed and Power Management on Hybrid-Electric Rotorcraft

On the Effects of Optimal Implementation of Variable Rotor Speed and Power Management on Hybrid-Electric Rotorcraft

Aeroacoustic modeling of helicopter transonic rotor noise

Optimal Segment Control of Active Twist Rotor for Power Reduction in Forward Flight

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