Noise Assessment of NASA Environmentally Responsible Aviation (ERA) Technologies and Concepts

Abstract

We present a comprehensive assessment of NASA Environmentally Responsible Aviation Project technologies across aircraft component, single event, and multi-event levels. Modeling capabilities appropriate for each level of abstraction are introduced. We examine noise technologies in terms of component-level performance effects, modeling considerations, and aircraft-level impacts. Single event performance results include discussion of reference vehicle models and their accuracy, as well as modeled vehicle performance in the form of noise certification point measurements and single event contours. We then present an assessment of the technology portfolio in the context of a generic airport multi-event study where the noise performance of industry project aircraft expected to enter the market over the next decade is also approximated. Results discussed provide a comprehensive characterization of noise reductions achievable with technologies in question and provide further analytical support for their continued development.

Multi-Disciplinary Survey of Engine Parameters and its Impact on Performance and Energy Maneuverability

“…21 The drawback of particularly high bypass fans is that shocks can occur near the tips of the blades which would increase noise. Therefore the fan speed and resultantly the fan pressure ratio (FPR) should be kept lower to minimize fan noise.…”