Simultaneous Use of Ground Reflection and Lateral Attenuation Noise Models

Berton, Jeffrey J.

doi:10.2514/1.c036488

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Cited by 8 publications

References 38 publications

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Numerical study on the flow-induced noise from waterjet-propelled ship regarding a flexible boundary

Li,

Zhang,

Yang

2023

Ocean Engineering

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Numerical study on the flow-induced noise from waterjet-propelled ship regarding a flexible boundary

Li,

Zhang,

Yang

2023

Ocean Engineering

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Variable Noise Reduction Systems for a Notional Supersonic Business Jet

Berton

2023

Journal of Aircraft

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A variable noise reduction system consists of equipment on board an airplane that is designed to reduce noise in the vicinity of airports. They are anticipated to be used on supersonic civil aircraft currently under development by industry. They are investigated in this paper for a notional 55,000 kg supersonic business jet. The airplane concept was developed by NASA for use in environmental impact studies conducted by the International Civil Aviation Organization. The variable noise reduction system investigated implements a programmed thrust lapse procedure and a programmed flap retraction procedure. The procedures are expected to reduce noise in aircraft certification as well as in operational practice. Behavior of the aircraft in a noise certification setting is considered. Variables of the procedures are optimized to reduce noise levels. The optimization results in a reduction of 5.2 decibels (in the cumulative effective perceived noise level, measured in EPNdB) relative to levels reported previously. Certification considerations unique to these systems are discussed for transport-category large airplanes and jet-powered airplanes. A novel method for evaluating lateral noise is used.

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Automatic Continuous Thrust Control for Supersonic Transport Takeoff Noise Reduction

Voet,

Prashanth,

Speth

et al. 2024

Journal of Aircraft

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Advanced takeoff trajectories are proposed for supersonic transport noise reduction by capitalizing on excess engine thrust and improved aerodynamic efficiency at higher takeoff speeds. These novel trajectories use i) automatic continuous control of thrust, ii) increased takeoff speed, and iii) reduced cut-back altitude, compared to conventional pilot-initiated discrete thrust cut-back procedures currently used for subsonic transport. In this paper, we develop an optimal control framework to assess the attributes of effective takeoff trajectories for supersonic transport that yield minimum noise levels. We quantify the noise reduction potential of advanced takeoff trajectories for the eight-passenger, 55-metric-ton, Mach-1.4 NASA Supersonic Technology Concept Airplane. For the aircraft examined, these advanced takeoff trajectories enable a cumulative certification noise reduction of 10.6 EPNdB, which is insufficient to meet current subsonic transport noise limits.

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Simultaneous Use of Ground Reflection and Lateral Attenuation Noise Models

Cited by 8 publications

References 38 publications

Numerical study on the flow-induced noise from waterjet-propelled ship regarding a flexible boundary

Numerical study on the flow-induced noise from waterjet-propelled ship regarding a flexible boundary

Variable Noise Reduction Systems for a Notional Supersonic Business Jet

Automatic Continuous Thrust Control for Supersonic Transport Takeoff Noise Reduction

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