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Johannes Timmermann, Norbert Hövelmann and Delf Sachau
From a strategic point of view, it is essential to protect underwater vehicles from being detected by opponents. Modern mono- or bistatic sonar systems are capable of precisely determining the position of a watercraft. In order to triangulate the positio...
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Ilaria Ronconi, Roberta Salierno, Ling Liu, Andrea Giglio, Francesco Ripamonti and Ingrid Paoletti
The limitations of active noise control (ANC) in coping with low frequencies and of passive noise control (PNC) in coping with middle-high frequencies are objects of research that present the potentialities of hybrid noise control (HBC). It aims at combi...
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Muhammad Hamza, Saima Bukhat Khan and Adnan Maqsood
The use of passive, active, or hybrid flow control techniques is often investigated to reduce the acoustic signature, wave drag, and aerodynamic heating associated with the supersonic flow regime. This research explores passive and hybrid flow control te...
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Jianguo Wang, Philip Rubini and Qin Qin
Passive control devices for combustion noise reduction in gas turbine engines and/or other general flow noises.
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Yuze Sun, Dan Zhao and Xiaowei Zhu
In the present work, 3D Unsteady Reynolds-Averaged Navier-Stokes (URANS) simulations are performed to investigate the generation and mitigation mechanism of combustion-sustained thermoacoustic instabilities in a modelled swirl combustor. The effects of (...
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Venanzio Giannella, Francesco Branda, Jessica Passaro, Giuseppe Petrone, Mattia Barbarino and Roberto Citarella
This work illustrates the development of passive noise control (PNC) improvements of aircraft headrests to enhance the acoustic comfort for passengers. Two PNC improvements were studied with the aim of reducing the noise perceived by passengers during fl...
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Jianguo Wang, Philip Rubini, Qin Qin and Brian Houston
Passive control devices for combustion instability and combustion noise in gas turbine engines.
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László Sujbert and Attila Szarvas
Office employees are exposed to acoustic noise, especially in an open office environment. Passive or active headsets sufficiently reduce the level of noise, but their long-time wear is uncomfortable. The paper presents an active headrest system built int...
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Alessandro Corsini, Anthony G. Sheard
Pág. 3 - 16
The paper presents a design procedure for anti-vortex end-plates that are fitted to tip limited blades of the subsonic axial fans utilised in compact cooling units. The authors study the impact of tip leakage vortex bursting on the performance of the stu...
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