Simulation Methodologies of Engine Noise Shielding by Wings Within Conceptual Aircraft Design

2020 ◽  
Vol 57 (6) ◽  
pp. 1202-1211
Author(s):  
Ana Vieira ◽  
Marc Koch ◽  
Lothar Bertsch ◽  
Mirjam Snellen ◽  
Dick G. Simons
Keyword(s):  
Aircraft Design ◽  
Engine Noise ◽  
Noise Shielding ◽  
Conceptual Aircraft Design

Acoustic Double Holography Method and its Application to Engine Noise Research

1997 ◽  
Author(s):  
Milsuo Nakano ◽  
Masao Nagamatsu ◽  
Kohei Suzuki ◽  
Takuya Yoshimura
Keyword(s):  
Noise Source ◽  
Near Field ◽  
Wave Length ◽  
Pressure Data ◽  
Acoustic Holography ◽  
Engine Noise ◽  
Simplified Approach ◽  
Noise Shielding ◽  
Full Load Operation ◽  
Control Work

Abstract The acoustic holography (AH) method with single measuring plane has been well known as the conventional method and can be implemented by far field measurement with simple instruments. However, the noise source resolution of the AH is not sufficient. In order to improve the resolution in the noise source identification, several kinds of the acoustic holography methods have been so far proposed. For example, the near field acoustic holography (NAH) can provide high and accurate resolution of the holography by the nearfield measurement. However, the nearfield measurement within one wave length is sometimes impossible in the actual circumstances. The Acoustic Double Holography (A D H) proposed in this paper is a simplified approach with higher resolution of the noise source locations than that of the conventional AH methods. The ADH method basically uses dual measuring planes and does not require nearfield measurement. The sound pressure data detected on the rear plane are transformed into the virtual pressure data on the front plane taking into account of the distance between the plane and the object. Comparing the virtual pressure data with the actual data measured on the front plane, resolution on holography can be improved significantly. Computer simulation and an experiment with two loud speakers were executed in order to confirm the fundamental feature of the proposed method. Several advantages on the method with respect to resolution over the conventional AH method were discussed. Furthermore, the ADH measurement was carried out on running engine under the full load operation. Through these results, the highly noise radiating areas on the engine surface were detected and reduced with noise shielding material. The overall engine noise level was reduced by 1.5dBA as the first stage in this noise control work.

Environmental assessment of hybrid-electric propulsion in conceptual aircraft design

2020 ◽  
Vol 247 ◽  
pp. 119477 ◽  
Author(s):  
João Ribeiro ◽  
Frederico Afonso ◽  
Inês Ribeiro ◽  
Bruna Ferreira ◽  
Hugo Policarpo ◽  
...  
Keyword(s):  
Environmental Assessment ◽  
Electric Propulsion ◽  
Aircraft Design ◽  
Conceptual Aircraft Design ◽  
Hybrid Electric

scholarly journals Conceptual Advanced Transport Aircraft Design Configuration for Sustained Hypersonic Flight

Aerospace ◽  
2018 ◽  
Vol 5 (3) ◽  
pp. 91 ◽  
Author(s):  
Can Alkaya ◽  
Ashish Alex Sam ◽  
Apostolos Pesyridis
Keyword(s):  
Aircraft Design ◽  
Combined Cycle ◽  
Cfd Analysis ◽  
Conceptual Approach ◽  
Transport Aircraft ◽  
Hypersonic Flight ◽  
Hypersonic Aircraft ◽  
Conceptual Aircraft Design

The conceptual aircraft design and its integration with a combined cycle engine for hypersonic cruise at Mach 8 is documented in this paper. The paper describes the process taken to develop a hypersonic aircraft from a conceptual approach. The discussion also includes the design and CFD analysis of the integrated combined cycle engine. A final conceptual hypersonic transport aircraft with an integrated combined cycle engine was achieved through this study. According to the analysis carried out, the aircraft is able to take-off and land at the airports it is intended to be used and will be able to generate enough thrust to sustain hypersonic cruise at an altitude of 30 km.

Low noise engine design for the Silent Aircraft Initiative

2009 ◽  
Vol 113 (1147) ◽  
pp. 599-607 ◽  
Author(s):  
C. A. Hall
Keyword(s):  
Aircraft Design ◽  
Low Noise ◽  
Urban Environments ◽  
Massachusetts Institute Of Technology ◽  
Engine Noise ◽  
Novel Technologies ◽  
Component Design ◽  
Design Changes ◽  
Institute Of Technology ◽  
The University

Abstract The Silent Aircraft Initiative was a Cambridge-MIT Institute programme involving a large team of researchers from both the University of Cambridge and the Massachusetts Institute of Technology (MIT). The aim of the project was to produce a concept aircraft design that would be so quiet it would be imperceptible in the urban environments around airports.. This paper gives an overview of how all the sources of engine noise were carefully addressed within the Silent Aircraft design. Novel technologies, a new engine configuration, improved airframe integration, new operational procedures and advanced component design were all required in order to reduce the overall engine noise level to the Silent Aircraft target. The study suggests that in order to dramatically reduce the noise of future aircraft engines a number of major design changes must be combined.

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