Multipaper Spectral Estimation: An Alternative to the Welch Periodogram Approach

Technical Report · Thu Sep 05 04:00:00 EDT 2019

DOI:https://doi.org/10.2172/1560107· OSTI ID:1560107

Candy, J. V. ^[1]

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1. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Dynamic structural systems either operational or under test require complex spectral analysis in order to characterize their modal responses. In some applications constant vigilance in terms of analysis or potential failures demand an accurate methodology to estimate both modal frequencies as well as mode shapes. Typically, classical periodogram spectra are windowed and averaged applying the well-known Welch periodogram methodology (WPM) for spectral estimation [1]. In this report we discuss an alternative technique—the Multitaper Method (MTM) that can be applied to solve this challenging problem especially in the case of noisy, uncertain accelerometer measurements [2]. This approach is based on the development of a set of orthogonal tapers or windows enabling a superior statistical performance alleviating the need to section/overlap the measured data. Therefore, the MTM is capable of producing reliable and accurate spectral estimates enabling the extraction of the structural modal vibration frequencies.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• DOE Contract Number: AC52-07NA27344
• OSTI ID: 1560107
• Report Number(s): LLNL--TR-788954; 985540
• Country of Publication: United States
• Language: English

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