Development of an aircraft noise emission model accounting for flight parameters

Zellmann, Christoph

doi:10.14279/depositonce-6712

Cited by 2 publications

(8 citation statements)

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“…The aircraft-specific noise emission models available in sonAIR are based on a set of multiple linear regression equations derived from a measurement dataset of real air traffic covering a wide range of typical aircraft operations [18]. A comprehensive validation study of the sonAIR emission models is provided in the work of Jäger et al [5].…”

Section: Sonair-based Noise Emission Modelmentioning

confidence: 99%

A comparative study of semi-empirical noise emission models based on the PANAM and sonAIR aircraft noise simulation tools

et al. 2023

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In the context of aircraft noise simulations, an accurate representation of the aircraft noise sources is crucial so that reliable predictions can be obtained. In this contribution, we present a comparative study between the predictions provided by the emission models based on the DLR in-house code PANAM and the sonAIR simulation software. Both are based on semi-empirical descriptions of the engine and airframe noise contributions, meaning that the emission levels are modeled separately for each noise source according to the operational conditions of the aircraft. This allows the comparison of the emission models not only in terms of the aircraft's overall noise levels, but also regarding its different noise sources. The comparative study considers models representing the noise emissions of an A319 aircraft, which are provided by both simulation tools but further simulated within the sonAIR software environment in order to yield noise immission levels on a large calculation area. In general, a good agreement is observed for the departure procedure due to the similar performance of the engine noise models. In contrast, larger differences are observed during the approach procedure and at larger distances from the runway, which might be explained by differences in the airframe noise models.

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Section: Sonair-based Noise Emission Modelmentioning

confidence: 99%

A comparative study of semi-empirical noise emission models based on the PANAM and sonAIR aircraft noise simulation tools

et al. 2023

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“…The computational predictions of the environmental noise caused by aircraft operations are hereby conducted using the software sonAIR [24]. The aircraft-specific noise emission models [16,37] available in sonAIR are based on a set of linear regression equa-tions derived from a database of experimental measurements covering a wide range of typical aircraft operations and flight configurations [37]. The overall noise emission is modeled as three-dimensional frequency-dependent directivity patterns accounting for the engine and airframe noise contributions, separately.…”

Section: Aircraft Noise Simulationmentioning

confidence: 99%

“…As discussed in Section 2.3, one characteristic of the simulation framework used by the software sonAIR is that the engine noise emissions are modeled using the N1 as the main parameter describing the engine settings. The use of N1 to model the engine noise instead of thrust, as commonly used by BPM [49,50], is justified by the fact that the N1 can describe the noise generated by the fan and the jet flow, the two dominant noise sources of a turbofan engine, as a parameter [16,37].…”

Section: Influence Of the N1 Valuesmentioning

confidence: 99%

“…The mean N1 values per aircraft type, holding procedure and flight phase are provided in Table 5. As no real N1 values are available to validate the N1 estimation methodology used in this work, a plausibility check is conducted by means of comparison with the mean N1 values provided by Zellmann [37]. The provided mean N1 values are calculated for the final approach flight phase, when the aircraft is aligned with the runway and stabilized for landing.…”

Section: Influence Of the N1 Valuesmentioning

confidence: 99%

“…According to Schwab and Zellmann [53] and Blinstrub [58], the stabilization usually occurs at an altitude of 1000 ft AGL (≈305 m AGL), when the landing gears and high-lift devices are fully deployed and the airspeed is kept constant by increasing the thrust accordingly. Therefore, mean N1 values and their corresponding standard deviation are computed considering all the flight trajectories calculated within the context of this contribution for an AGL of 15 ft ≤ z ≤ 1000 ft. For an Airbus A320 equipped with V2500 turbofan engines, the mean and standard deviation N1 values provided by Zellmann [37] for the final approach phase are ≈(48 ± 5)%. The mean and standard deviation N1 values of the flight trajectories calculated for the vertical holding stack are ≈(54 ± 1)%, while for the linear hold point merge they are ≈(56 ± 8)%.…”

Section: Influence Of the N1 Valuesmentioning

confidence: 99%

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Environmental Noise Assessment of Holding Approach Procedures Using a Multi-Level Simulation Framework

et al. 2022

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Computational models of sufficient quality are indispensable to quantitatively assess aircraft noise reduction measures. Within this study, a multi-level simulation framework is established in order to predict the environmental noise of holding approach procedures by coupling simulation models from three different domains: flight performance calculation employing the base of aircraft data (BADA), jet engine performance using the software Gasturb and aircraft noise simulations based on the software sonAIR. Two different concepts of holding approach procedures are investigated, namely, the vertical holding stack and the linear hold point merge. The study is conducted considering generic air traffic scenarios at a single-runway airport. Thereby, the investigated air traffic is based on a statistical analysis of traffic data at existing airports and thus assumed to be representative. As the aircraft’s noise emission depends on both the aircraft and the engine performance, reliable results can be expected only if all individual challenges and interdependencies are accounted for simultaneously. Addressing this challenge is the main contribution of the presented work. The presented results show the plausibility of the proposed multi-level simulation framework, thus supporting its use to investigate the environmental noise impact of air traffic scenarios.

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Development of an aircraft noise emission model accounting for flight parameters

Cited by 2 publications

References 0 publications

A comparative study of semi-empirical noise emission models based on the PANAM and sonAIR aircraft noise simulation tools

A comparative study of semi-empirical noise emission models based on the PANAM and sonAIR aircraft noise simulation tools

Environmental Noise Assessment of Holding Approach Procedures Using a Multi-Level Simulation Framework

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