Hilbert-Huang transformation-based touch sliding block sub-nanoscale harmonic detection system
A harmonic detection and sub-nano technology, applied in measuring devices, using wave/particle radiation, measuring ultrasonic/sonic/infrasonic waves, etc., can solve problems such as the inability to detect the contact interval between sliders and disks
Pending Publication Date: 2022-08-02
NANJING VOCATIONAL UNIV OF IND TECH
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Problems solved by technology
[0006] The purpose of the present invention is to provide a touch slider sub-nanoscale harmonic detection system based on Hilbert-Huang transformation, to solve the non-linear response characteristics (including amplitude, frequency, etc.) caused by contact in the above background technology , the length of the contact interval is also very important for the judgment of the flight state. At present, it is impossible to detect the length of the contact interval between the slider and the disk.
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[0031] Contactless Case
[0032] For the non-contact case, the LDV signal is substituted into figure 2 The five main intrinsic mode functions (IMFs) shown in the figure, the corresponding relationships of a, b, c, d and e in the figure are (a)-IMF1, (b)-IMF2, (c)-IMF3, (d) )-IMF4 and (e)-IMF5, whose transient frequency (Instantaneous frequency, IF) is as image 3 As shown in the figure, the corresponding relationships of a, b, c, d and e in the figure are (a)-IF1, (b)-IF2, (c)-IF3, (d)-IF4 and (e)-IF5, respectively. Neither figure shows obvious regularity, but the higher the IMF, the higher the bandwidth;
[0033] light contact case
[0034] In order to obtain more detailed data, the same analysis was performed on the cases of light exposure ( Figure 4 and 5 ), Figure 4 The corresponding relationships of a, b, c, d and e are (a)-IMF1, (b)-IMF2, (c)-IMF3, (d)-IMF4 and (e)-IMF5, respectively. Figure 5 The corresponding relationships of a, b, c, d and e are (a)-IF1, (b...
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The invention discloses a touch control sliding block sub-nanometer scale harmonic detection system based on Hilbert-Huang transformation in the technical field of magnetic head sliding block detection. The touch control sliding block sub-nanometer scale harmonic detection system comprises a detected piece; the intrinsic mode function detection mechanism is arranged at the upper end of the detected piece and is used for executing intrinsic mode function detection of the detected piece; the intrinsic mode function detection mechanism comprises a laser Doppler velocity measurement sensor suspended at the upper ends of the magnetic disk and the sliding block, and a first filter connected to one end, far away from the magnetic disk, of the laser Doppler velocity measurement sensor; the intrinsic mode function detection mechanism is used for detecting the length of a contact interval between a sliding block and a magnetic disk, the transient frequency detection mechanism is connected with the detected piece and used for detecting the transient frequency of the detected piece, and the intrinsic mode function detection mechanism and the transient frequency detection mechanism can detect the length of the contact interval between the sliding block and the magnetic disk; and the contact severity of the sliding block in the flying process can be effectively judged.
Description
technical field [0001] The invention relates to the technical field of magnetic head slider detection, in particular to a touch slider sub-nanometer scale harmonic detection system based on Hilbert-Huang transformation. Background technique [0002] At present, the flight characteristics of magnetic head thermal flight control (thermal flight control, TFC for short) sliders have been studied a lot. Previous studies have shown that there are many nonlinear dynamic phenomena in the TFC slider during flight. Xu et al. used a laser Doppler vibrometer to study the motion of the slider and the lubricant under the interaction of vertical, pitch, roll, off-track and down-track directions. Spectral analysis of the slider motion shows that the excitation for all degrees of freedom occurs at the same frequency. ChachiSV, BogyDB investigated the peculiar dynamic response of certain slider designs observed in ground / contact tests. The nonlinear system theory is used to emphasize the i...
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IPC IPC(8): G01H9/00
CPCG01H9/00G01H9/008Y02T90/00
Inventor 王昭昕宋增禄
Owner NANJING VOCATIONAL UNIV OF IND TECH