From Single Event to Scenario Noise Assessment of SST Business Jet Concept Aircraft

DLR is involved in ongoing technical discussions at ICAO CAEP to quantify aircraft noise generation and define certification regulations for novel supersonic transport aircraft. A major goal of this DLR involvement is to develop the means for a full environmental assessment of novel SST concepts and technologies to support CAEP's decision making process. This paper presents the most recent status of the assessment capabilities for the Landing and Take-off (LTO) phase of novel SST vehicles. Compared to previously published work, the assessment and prediction capabilities have been further updated and additional methods are incorporated. The paper shows the latest updates to the simulation process and presents a new application case. Two available SST business jets are assessed in detail for their single event LTO noise and describes the result transition into a scenario assessment. In the presented study, the departure procedures for both aircraft are optimized for lowest certification noise levels based on reduction measures as initially proposed by NASA, i.e., variation of take-off speed and thrust setting during departure, and fully compliant with proposed new certification regulations. Implications on certification levels, noise contour areas, and local air quality are evaluated along the different procedures. For the selected two concept aircraft, the required input data is generated to enable an overall scenario assessment with a corresponding CAEP approved, DOC9911 compatible tool. This data is comprised of NPD tables, spectra, and flight trajectories in fixed-point format. A full simulation of a large air traffic scenario was not in the scope of this work but the required single event input data is now available and has been checked for consistency and feasibility. A scenario assessment is not feasible until a later point in time when reliable data on potential demand and anticipated number of flight operations is established and publicly available. In conclusion, this paper demonstrates the updated capabilities at DLR and presents latest study results for an application of the multi-level simulation process, i.e., combining the assessment on a component level, to the single aircraft, and finally toward the full air traffic scenario.