What is it about?
To make the urban air mobility a reliable and acceptable scenario, innovative solutions and strategies have to be found. These have to guarantee an environmentally sustainable aviation in agreement with the increasingly demanding constraints in terms of noise emissions. In this framework, it is examimed the possibility to reduce the noise emitted by multi-rotor systems by identification of trim strategies more suitable for generating the minimum acoustic nuisance. This is performed by applying a novel energy-based trim procedure able to optimise selected target functions by suitably setting the redundant controls which are typically present in multi-rotor systems. In this work, the control strategies are based on a pure rotor angular velocity control, a pure blade collective pitch control and a combined angular velocity and blade collective pitch control. For each configuration, the acoustic emissions are evaluated and compared, for different flight conditions, demonstrating the effect of the adopted trim strategy on the emitted noise.
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Why is it important?
Urban Air mobility systems represents a potential answer to the infrastructure congestion, overcoming the limited capacity of ground transport. Evolving the mobility from two to three dimensions by introducing fully electric vertical take-off and landing vehicles, represents not only a faster and reliable mode of transportation, but also an energy-efficient, safer, and quieter solution. Nevertheless, some unresolved issues have to be dealt with in order to make the air mobility aviation an acceptable scenario. Between them, being the community noise one of the major barriers to entry-into-service of urban aerial vehicles, low-noise technologies and strategies have to be found and exploited to guarantee environmentally sustainable aviation in agreement with the increasingly demanding requirements and certification rules.
Perspectives
The numerical investigations have demonstrated the significant influence of the trim strategy on the radiated noise. Therefore, it is proven that a suitable choice of the trim strategy is a viable mean to reduce the noise emission of multi-rotor configurations. The presented preliminary numerical investigation suggests that, for instance, the combined command of angular velocity and collective pitch angle obtained by a trim procedure that considers the minimization of a noise-based objective function is a possible suitable solution to reduce the noise emission of multi-rotor vehicles.
Caterina Poggi
Universita degli Studi Roma Tre
Read the Original
This page is a summary of: Influence of trim control strategy on noise radiated by multi-rotor systems, June 2022, American Institute of Aeronautics and Astronautics (AIAA),
DOI: 10.2514/6.2022-2971.
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