A new method for modal parameter identification based on analytical modal decomposition and Hilbert transformation

作者：Li Jing; Cao Deng Qing; Liu Shao Kui; Yu Tian Hu; Wang Qing Yang

来源：Journal of Vibration and Shock, 2016, 35(1): 34-39.

DOI：10.13465/j.cnki.jvs.2016.01.007

• Closely spaced modes
• Hilbert transformations
• Low-frequency
• Modal damping ratios
• Modal decomposition

In order to identify modal parameters of spacecraft structures with low frequencies and closely spaced modes, a new identification method based on analytical modal decomposition (AMD) and Hilbert transformation (HT) was proposed. The modal frequencies and modal damping ratios of a structure were obtained with its impulse responses at any point. A satellite model composed of a central rigid body and two panels was taken as a typical example of spacecraft structures. The low-order modal parameters of a single panel and the satellite model under fixed boundary conditions were identified using this method. The comparison between the results obtained with this method and those obtained with tests and other simulation methods showed that the new proposed method is valid, especially, for spaceraft structures with low frequencies and closely spaced modes.

• 出版日期2016