CPD in Aircraft Noise

Description

Aircraft noise is a prominent environmental issue that concerns airports, aircraft operators, decisionmakers, aviation regulators, and communities living near airports. Nearly all airfield operations are
regulated and there is now a vast body of technical documentation, law and local regulations on the
general problem of aviation noise. This course will address many of the environmental issues from a
technical and engineering point of view. It will focus specifically on the aspects of noise generation, noise
propagation and mitigation strategies (design & operational). There will be consideration of certification,
compliance requirements, with access to the latest noise regulations for commercial aviation (ICAO/EASA)

Additional Description

Class 1: Critical introduction to aircraft noise
• Psychoacoustics effects of aircraft noise (commercial and military)
• Basic definitions of sound and noise
• Airports regulations, noise certificates, and aircraft noise trends
• Legal aspects of aircraft noise (including ICAO, FAA)

Class 2: Definition of noise metrics
• Instantaneous noise metrics
• Tonal and broadband noise
• Time-averaged metrics (ANSI definitions)
• Integral metrics (EPNL, SEL)
• Short- and long-term metrics (day, season, year)
• Noise quotas and Quota Counts (QC)
• Demo: interpreting key noise metrics

Class 3: Aircraft noise measurements techniques
• Standard equipment, description, accuracy (SLM, or sound level meters)
• Noise event identification
• Measurement locations; integration with other systems (FDR, GPS, ADS-B/Mode-S)
• Automatic noise tracking at airfields (FIDS)


Class 4: Practical demo of noise measurements
• Statistical analysis and data processing
• Beamforming techniques
• Comparison between departure and arrival noise signatures
• Noise characterisation (turbofan and turboprop engines)
Class 5: Airframe Noise Sources

• Engineering systems and network analysis
• Sources, characterisation, modelling, prediction
• Lifting surfaces noise (broadband noise models)
• Landing gear noise (various alternatives)
• High-lift system noise

Class 6: Propulsion Noise Sources, Part I *
• Network analysis of propulsion noise
• Fan system noise
• Acoustic liners

Class 7: Propulsion Noise Sources, Part II *
• Engine core noise (compressor, combustor, gas turbines)
• Jet noise and corresponding models (single and dual stream jets)
• Jet noise shielding
• Auxiliary Power Unit (APU) noise
• Demo: Use of APU on the ground

Class 8: Propeller and propfan noise
• Nature of noise generation
• Tonal noise modelling
• Broadband noise models
• Minimum-noise design and configurations: synchrophasing, etc.
• Contra-rotating propeller noise

Class 9: Introduction to aircraft noise propagation
• Long-range noise propagation models
• Effects of atmospheric winds, humidity, turbulence on propagation
• Low-order methods:
o ANSI/SAE-AIR method
o Noise-Power-Distance (NPD)
• High-order methods
o Wave equation
o Ray tracing methods
o Other field methods

Class 10: Aircraft noise reduction by trajectory optimisation
• Elements of multi-objective optimisation
• Trajectory constraints and typical operations
• Noise abatement procedures: NADP (noise abatement departure procedures)
• Demo: Steep-descent, continuous descent, displaced landing; noise breakdown analysis

Class 11: Noise footprints
• Characteristics of noise footprints
• Determination of footprints, metrics, differential effects, and assessment
• Airport/airfield models
• Computational models for noise footprints
• Demo: unsteady effects on noise maps

Period	15 Oct 2024 → 31 Oct 2024
Event type	Course