caa a22 4500 477092721 CHVBK 20180405111519.0 cr unu---uuuuu 170330e19961101xx s 000 0 eng 10.1007/BF01893301 doi (NATIONALLICENCE)springer-10.1007/BF01893301 Extraction of turbulent wall-pressure time-series using an optimal filtering scheme [Elektronische Daten] [A. Naguib, S. Gravante, C. Wark] Accurate measurements of pressure beneath turbulent wall-bounded flows are generally difficult to achieve due to signal contamination resulting from facility-induced noise, sensor vibration, etc. This is particularly true at low Reynolds numbers where the noise signature overwhelms the low-level turbulent fluctuations. In the current work a noise-cancellation technique based on an optimal filtering approach is developed. This technique is particularly useful for conditions of low signal-to-noise ratio and therefore it is well suited for low to moderate Reynolds number measurements. Unlike the conventional, subtraction-based, noise-cancellation methods, the utility of the optimal-filter scheme is not limited to the extraction of the turbulent statistics but it can be used to obtain the noise-canceledtime-series. Furthermore, the energy of the low-frequency turbulent motion lost due to the application of the noise-cancellation scheme is an order of magnitude smaller in the case of the optimal filter as compared to the subtraction scheme. Employment of the technique developed here is not confined to two-dimensional flows and therefore it is also useful for measurements in applications involving non-equilibrium flows. Springer-Verlag, 1996 Naguib A. Mechanical and Aerospace Engineering Dept., Illinois Institute of Technology, 60616, Chicago, IL, USA aut Gravante S. Mechanical and Aerospace Engineering Dept., Illinois Institute of Technology, 60616, Chicago, IL, USA aut Wark C. Mechanical and Aerospace Engineering Dept., Illinois Institute of Technology, 60616, Chicago, IL, USA aut Experiments in Fluids Springer-Verlag 22/1(1996-11-01), 14-22 0723-4864 22:1<14 1996 22 348 https://doi.org/10.1007/BF01893301 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01893301 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Naguib A. Mechanical and Aerospace Engineering Dept., Illinois Institute of Technology, 60616, Chicago, IL, USA aut NATIONALLICENCE 700 1- Gravante S. Mechanical and Aerospace Engineering Dept., Illinois Institute of Technology, 60616, Chicago, IL, USA aut NATIONALLICENCE 700 1- Wark C. Mechanical and Aerospace Engineering Dept., Illinois Institute of Technology, 60616, Chicago, IL, USA aut NATIONALLICENCE 773 0- Experiments in Fluids Springer-Verlag 22/1(1996-11-01), 14-22 0723-4864 22:1<14 1996 22 348 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer