## 4 Conclusions and Future Studies  
Considering the potential rerouting of aeronautic traffic from Otopeni Airport to Baneasa Airport, this study was conducted based on the fact that most of the aircraft operating at OTP are equipped with CFM 56-type engines. Thus, the first step of this research involved measuring the directivity of a CFM 56 engine mounted on an aircraft, during both the idling and maximum-load regimes.  
The second step involved designing a sound-absorbing panel through the evaluation of various perforated plate configurations via impedance tubes. Using the directivity data, a simulation was performed using the IMMI software, with the two engines of an aircraft serving as the acoustic power source and the directivity obtained from the experiments. The simulation was performed for the maximum operating regime of the engines when the plane was taking off and was on the ground, assuming a location in the vicinity of the area where the houses are closest to the runway. The subsequent round of simulations was performed by incorporating a panel with the characteristics determined in the laboratory and a height of 4 m. This panel would be made of fireproof and weather-resistant material and would be transparent, avoiding any visual disruptions or alterations to the local landscape for the residents in the area.  
The comparison showed a reduction in Leq of approximately 15 dB. These simulations indicate that Baneasa Airport could accommodate aircraft with CFM 56 engines without  
Figure 20: The noise contour for two CFM56 engines and the designed screen.  
causing additional acoustic impact to the inhabited area surrounding the runway. The noise reduction could be improved further by increasing the height of the panel.  
A 15 dB reduction in Leq is considered to be a substantial improvement in terms of reducing the noise impact on those living near the airport. However, the actual impact on the residents would vary, based on factors such as the initial noise levels, the residents' sensitivity to noise, and the duration and frequency of noise exposure. Further assessments are necessary to fully determine the impact.  
In the future, we aim to expand this study to include other types of aircraft equipped with different types of turbo engines. Additionally, we plan to conduct a study using different types of sound-absorbing panels. Another research direction will involve simulating aircraft movement on the take-off runway, using specialized software.  
Conceptualization, A.C.T. and G.C.; methodology, G.C. and D.-E.C.; software, A.C.T.; validation, G.C.; formal analysis, D.-E.C.; investigation, A.C.T. and G.C.; resources, A.C.T.; data curation, A.C.T. and G.C.; writing--original draft preparation, A.C.T., G.C. and D.-E.C.; writing--review and editing, A.C.T., G.C. and D.-E.C.; visualization, G.C.; supervision, D.-E.C.; project administration, A.C.T. All authors have read and agreed to the published version of the manuscript.  
This work has been carried out through the NUCLEU Program within the National Research, Development and Innovation Plan 2022-2027, implemented with the support of MCID, project no. PN23.12.03.01.  
Not applicable.  
The authors declare no conflict of interest.