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Abstract <p>Pressure-sensitive paint (PSP) measurements were denoised using projected multivariate singular spectrum analysis (PMSSA) to extract sub-Pascal surface pressure fluctuations. Combined with coherent output power (COP) analysis, the method reduced the noise floor by more than an order of magnitude, enabling resolution as low as 0.1&#xa0;Pa<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(^2\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow /> <mn>2</mn> </mmultiscripts> </math></EquationSource> </InlineEquation>/Hz. Application to a two-dimensional NACA 0012 airfoil reveals coherent surface-pressure structures associated with tonal trailing-edge noises, including a secondary component that is not an integer multiple of the primary tone at a Reynolds number of <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(3.5\times 10^5\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>3.5</mn> <mo>×</mo> <msup> <mn>10</mn> <mn>5</mn> </msup> </mrow> </math></EquationSource> </InlineEquation>. A two-dimensional mid-chord structure on the suction side overlaps with that of the primary tone and is consistent with a laminar separation bubble. Quantitatively, the COP obtained from PSP data processed with PMSSA was lower than that from the pressure transducer, indicating partial attenuation of trailing-edge noise components.</p> Graphic abstract <p></p>

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Denoising pressure-sensitive paint measurements to detect sub-Pascal surface pressure fluctuations associated with aeroacoustic tones

  • 期刊论文

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  • 发表日期：

    2026年5月25日

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  • Masato Imai,
  • Keita Ogura,
  • Akihiro Fukuda,
  • Kohei Konishi,
  • Yuya Ohmichi,
  • Kazuyuki Nakakita,
  • Masaharu Kameda

摘要

Abstract

Pressure-sensitive paint (PSP) measurements were denoised using projected multivariate singular spectrum analysis (PMSSA) to extract sub-Pascal surface pressure fluctuations. Combined with coherent output power (COP) analysis, the method reduced the noise floor by more than an order of magnitude, enabling resolution as low as 0.1 Pa \(^2\) 2 /Hz. Application to a two-dimensional NACA 0012 airfoil reveals coherent surface-pressure structures associated with tonal trailing-edge noises, including a secondary component that is not an integer multiple of the primary tone at a Reynolds number of \(3.5\times 10^5\) 3.5 × 10 5 . A two-dimensional mid-chord structure on the suction side overlaps with that of the primary tone and is consistent with a laminar separation bubble. Quantitatively, the COP obtained from PSP data processed with PMSSA was lower than that from the pressure transducer, indicating partial attenuation of trailing-edge noise components.

Graphic abstract