CN114838802A - Touch slider sub-nanoscale harmonic detection system based on Hilbert-Huang transform - Google Patents
Touch slider sub-nanoscale harmonic detection system based on Hilbert-Huang transform Download PDFInfo
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- CN114838802A CN114838802A CN202210449219.4A CN202210449219A CN114838802A CN 114838802 A CN114838802 A CN 114838802A CN 202210449219 A CN202210449219 A CN 202210449219A CN 114838802 A CN114838802 A CN 114838802A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/008—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means by using ultrasonic waves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
The invention discloses a sub-nanometer harmonic detection system of a touch slider based on Hilbert-Huang transform, belonging to the technical field of magnetic head slider detection, and comprising: a measured piece; the intrinsic mode function detection mechanism is arranged at the upper end of the tested piece and used for executing the intrinsic mode function detection of the tested piece, and the intrinsic mode function detection mechanism comprises a laser Doppler velocity measurement sensor and a first filter, wherein the laser Doppler velocity measurement sensor is suspended at the upper ends of the magnetic disc and the sliding block, and the first filter is connected to one end, far away from the magnetic disc, of the laser Doppler velocity measurement sensor; the invention can detect the contact interval between the slider and the magnetic disk through the inherent mode function detection mechanism and the transient frequency detection mechanism, and can effectively judge the contact severity of the slider in the flying process.
Description
Technical Field
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
Currently, the flying characteristics of a slider for Thermal Flight Control (TFC) have been studied more. Previous studies have shown that TFC sliders have many nonlinear dynamic phenomena during flight. Xu et al investigated the motion of the slider and lubricant under the interaction of vertical, pitch, roll, off-track and down-track directions using a laser doppler vibrometer. Spectral analysis of the slider motion shows that the excitation of all degrees of freedom occurs at the same frequency. ChachiSV, BogyDB, studied the special dynamic response of certain slider designs observed in ground/contact testing. Nonlinear system theory is intended to emphasize the instability of the slider due to the vibration modes of the unfavorably coupled system under internal resonance conditions and theoretically predicts that large amplitude vibrations of the slider are likely to be caused by the excitation frequency and the main frequency response of the slider. GangChen discusses vibration caused by contact/friction of air bearing slider in hard disk systematically based on acoustic emission generated by contact/friction-vibration interaction, and provides a method for disc surface screening and mass production certification by using contact/friction induction acoustic emission technology. These studies highlight important air bearing curve design considerations that help prevent slider instability and reduce unnecessary slider vibration, thereby ensuring reliability at extremely low head-disk clearances. Furthermore, these studies have also shown that harmonic detection of vibrations is intended to characterize the nonlinear dynamics of thermal flight control sliders, and thus qualitatively understand the flying state of the magnetic head.
Detection of harmonics in the Fast Fourier Transform (FFT) is key to characterizing TFC slider nonlinear dynamics. The sound emission signals measured when the TFC slider is in contact with the ground are used as approximate vibration values by Sheng and Xu, and the dynamic characteristics of the flying height control slider are identified by using a high-order frequency response function. The results show that slider vibrations exhibit weak non-linear characteristics during the thermal contact transition phase and linear characteristics during the over-push and light contact phases. Chen, Zheng and Bogy studied different dynamic phases in the tapping process and verified that the slider can reach the surfing phase, which is characterized by a relatively low touch signal amplitude. The surfing condition also contains significant frequency content and exhibits angstrom-scale modulation on the movable portion of the lubricant layer. And the AngYang and YuWang respectively use different frequency bands to position the structural mode and the air flotation mode on the basis of the spectrum analysis. Furthermore, statistical methods and regression analysis techniques are used to quantitatively describe the relationship between the amount of wear and the dissipated energy extracted from the vibration signal. RahulRai and punetetbharmagava teach a method of detecting head-disk spacing variations using an Embedded Contact Sensor (ECS). The magnitude of the ECS frequency component can be used to determine the "feature spacing," and the frequency domain response of the ECS to the slider excitation can be used as a measurement to detect changes in head interface distance. The results show that ECS-based proximity metrology is able to capture changes in head spacing very well. These findings indicate that FFT-based spectral analysis is a good method of head-flight analysis. However, accurate detection of multiple harmonic vibrations of the TFC slider is a very challenging problem in reality because the harmonics in the FFT exhibit sub-nanometer peaks and are often contaminated by noise. Furthermore, due to uncertainty in interface lubricant and material wear, contact vibration of the TFC slider may be non-stationary with transient and abrupt contact information, while it is difficult to extract detailed incidental information using the spectral analysis method of the radix FFT.
When head crashes and rubs occur or develop, this can result in an uneven dynamic signal. More and more detailed information can be obtained by analyzing the head-disk contact signal using a new digitization process that is not stationary. Aiming at the problem of non-stationarity of a test signal, a singular value decomposition method is introduced into He and Chen to improve the detection precision of multiple harmonics. By the singular value decomposition theory, the attenuation of signal noise can be realized, and the contact information of transient mutation can be accurately extracted. The Sheng and He carry out experimental study on the transient dynamic characteristics of an air bearing slider (micro slider) with the diameter of less than 10 nanometers, and empirical mode decomposition is introduced to obtain the non-stationary nonlinear response of the slider. The result shows that the empirical mode decomposition method with the self-adaptive decomposition capability can clearly distinguish the weak influence of the slider and the defects on the magnetic disk and can represent the non-stable non-linear spectral characteristics of the slider contact response. Wang and Yuan introduced an improved neighborhood coefficient denoising and maximum-minimum threshold integrated noise reconstruction empirical mode decomposition (estimate) method to identify non-stationary and transient dynamics of sliders during impact. The results show that the ENEMD method can reveal the transient dynamics of the slider caused by impact and illustrate that the air bearing mode has a major influence on the slider dynamics when the slider is in contact.
However, in addition to the nonlinear response characteristics (including amplitude, frequency, etc.) caused by contact, the length of the contact interval is important for determining the flying state, and the length of the contact interval between the slider and the magnetic disk cannot be detected at present.
Disclosure of Invention
The invention aims to provide a touch slider sub-nanometer harmonic detection system based on Hilbert-Huang transformation, which aims to solve the problems that the length of a contact interval is important for judging a flight state besides nonlinear response characteristics (including amplitude, frequency and the like) caused by contact, and the length of the contact interval between a slider and a magnetic disk cannot be detected at present, which are proposed in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a touch slider sub-nanometer scale harmonic detection system based on Hilbert-Huang transform comprises:
a measured piece;
the intrinsic mode function detection mechanism is arranged at the upper end of the tested piece and used for executing the intrinsic mode function detection of the tested piece;
and the transient frequency detection mechanism is connected with the tested piece and is used for executing the transient frequency detection of the tested piece.
Preferably, the tested piece comprises a magnetic disk, a motor which is arranged at the bottom of the magnetic disk and drives the magnetic disk to rotate, and a sliding block which is suspended at the edge of the top of the magnetic disk, and the distance between the sliding block and the magnetic disk is 10 nanometers.
Preferably, the inherent modal function detection mechanism includes a laser doppler velocity measurement sensor suspended on the upper ends of the magnetic disk and the slider, a first filter connected to one end of the laser doppler velocity measurement sensor far away from the magnetic disk, and a first oscilloscope connected to one end of the first filter far away from the laser doppler velocity measurement sensor, where the first oscilloscope is connected to a PC terminal.
Preferably, the transient frequency detection mechanism includes a signal adjuster connected to the slider, a second filter connected to the signal adjuster and located at an end of the signal adjuster, the second filter being located at an end of the signal adjuster, the acoustic emission detector being disposed on the slider, a preamplifier connected to the acoustic emission detector and located at an end of the acoustic emission detector, a third filter connected to the preamplifier and located at an end of the preamplifier, the third filter being located at an end of the preamplifier and located at an end of the preamplifier, and the second oscilloscope is connected to the second filter, and both the second oscilloscope and the second filter are connected to a PC terminal.
Preferably, the size of the slide block is 0.85x0.7x0.23mm 3 。
Compared with the prior art, the invention has the beneficial effects that: according to the touch slider sub-nanometer harmonic detection system based on Hilbert-Huang transformation, the contact interval between a slider and a magnetic disk can be detected through the inherent modal function detection mechanism and the transient frequency detection mechanism, and the contact severity of the slider in the flying process can be effectively judged.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a diagram of IMFs of a non-contact LDV signal according to the present invention;
FIG. 3 is a schematic diagram of instantaneous frequencies of IMFs of the non-contact LDV signal of the present invention;
FIG. 4 is a diagram of IMFs of LDV signals under light contact according to the present invention;
FIG. 5 is a schematic diagram of the instantaneous frequencies of the IMFs of the LDV signals under light contact according to the present invention;
FIG. 6 is a diagram of IMFs of LDV signals under heavy touch in accordance with the present invention;
FIG. 7 is a schematic diagram of the instantaneous frequencies of IMFs of LDV signals under touchdown in accordance with the present invention;
FIG. 8 is a schematic diagram of the time domain waveform and instantaneous frequency of the IMF1 tap of the present invention;
FIG. 9 is a schematic diagram of the time domain waveforms and instantaneous frequency structure of IMFs 2 and 3 under heavy contact according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a touch slider sub-nanometer harmonic detection system based on Hilbert-Huang transform, which can detect the contact interval between a slider and a magnetic disk through an inherent modal function detection mechanism and a transient frequency detection mechanism, and can effectively judge the severity of contact in the flying process of the slider, and please refer to FIG. 1, which comprises the following steps: the device comprises a tested piece, a natural mode function detection mechanism and a transient frequency detection mechanism;
the part to be measured comprises a magnetic disk, a motor and a sliding block, wherein the motor is arranged at the bottom of the magnetic disk and drives the magnetic disk to rotate, the sliding block is suspended at the edge of the top of the magnetic disk, the distance between the sliding block and the magnetic disk is 10 nanometers, and the size of the sliding block is 0.85x0.7x0.23mm 3 ；
The intrinsic mode function detection mechanism is arranged at the upper end of the tested piece and used for executing the intrinsic mode function detection of the tested piece, the intrinsic mode function detection mechanism comprises a laser Doppler velocity measurement sensor suspended at the upper ends of the magnetic disc and the sliding block, a first filter connected to one end, far away from the magnetic disc, of the laser Doppler velocity measurement sensor and a first oscilloscope connected to one end, far away from the laser Doppler velocity measurement sensor, of the first filter, and the first oscilloscope is connected to the PC end;
the transient frequency detection mechanism is connected with the tested piece and used for executing transient frequency detection of the tested piece, and comprises a signal regulator connected to a sliding block, a second filter connected to the signal regulator and far away from one end of the sliding block, an acoustic emission detector arranged on the sliding block, a preamplifier connected to one end, far away from the sliding block, of the acoustic emission detector, a third filter connected to one end, far away from the acoustic emission detector, of the preamplifier, and a second oscilloscope connected to one end, far away from the preamplifier, of the third filter, wherein the second oscilloscope is connected with the second filter, and the second oscilloscope and the second filter are both connected to a PC (personal computer) end.
Examples
Non-contact case
For the non-contact case, the LDV signal is substituted into 5 main Intrinsic Mode Functions (IMFs) shown in fig. 2, in which a, b, c, d and e correspond to (a) -IMF1, (b) -IMF2, (c) -IMF3, (d) -IMF4 and (e) -IMF5, respectively, and the Instantaneous Frequencies (IF) thereof are as shown in fig. 3, in which a, b, c, d and e correspond to (a) -IF1, (b) -IF2, (c) -IF3, (d) -IF4 and (e) -IF5, respectively, and these two numbers do not show obvious regularity, but the higher the IMF, the higher the bandwidth;
light contact case
To obtain more detailed data, the same analysis was performed for the case of light contact (fig. 4 and 5), in which fig. 4 a, b, c, d and e correspond to the relationships (a) -IMF1, (b) -IMF2, (c) -IMF3, (d) -IMF4 and (e) -IMF5, respectively, and fig. 5 a, b, c, d and e correspond to the relationships (a) -IF1, (b) -IF2, (c) -IF3, (d) -IF4 and (e) -IF5, respectively. From FIG. 4, significant effects of IMF components can be observed from the extracted IMFs, which indicate crash contact information, FIG. 5 shows the first five transient frequencies (IF) of the IMFs, IF1 shows high fluctuations most of the time, except for some specific duration, which will be explained in the discussion section, and IF2 has similar impact information, which implies component instability;
case of severe contact
For the heavy contact case data (fig. 6 and 7), the relationships a, b, c, d and e in fig. 6 are (a) -IMF1, (b) -IMF2, (c) -IMF3, (d) -IMF4 and (e) -IMF5, respectively, and the relationships a, b, c, d and e in fig. 7 are (a) -IF1, (b) -IF2, (c) -IF3, (d) -IF4 and (e) -IF5, respectively, with significant vibration frequencies being seen in the IF1 at 360kHz, and in addition, unstable amplitudes being seen in the time domain, the amplitude of IMF2 collapses with a rapid rise in frequency over time, IMF3 illustrates the significant effect of amplitude and frequency, indicating its instability;
in the case of a light contact, the contact causes vibration to increase, but some random vibration of high frequency components is suppressed, for example, in fig. 8, when the slider is in contact with the disk, impact friction not only causes vibration amplitude to increase, but also limits the frequency under the constraint of support stiffness and damping, and the sharp rise of IMF amplitude and collapse of frequency fully illustrate the contact between the slider and the disk, and clearly prove that the EMD analysis is more reflective of contact details than FFT;
in the case of heavy contact, the contact increases the stiffness of the disk, which results in a new resonance frequency of 360kHz, as in FIGS. 6a and 7a, FIG. 9 is the amplitude waveform in the time domain of IMF2 and IMF3 and its transient frequencies IF2 and IF3, and when IMF2 "goes down", IF2 "jumps" from near 80kHz to near 210kHz, which means that the vibration is being transferred from a forced state to a free state, while the frequency is being transferred from the resonance frequency to the natural frequency, IMF3 shows the exact opposite trend in synchronism compared to IMF2, and therefore we evaluate that these compacted components are produced by stiffness changes due to the slider and disk disengagement and engagement;
from the above analysis, it can be seen that, whether the contact is light or heavy, the instantaneous frequency obtained by the LDV signal HHT contains periodically abrupt components, the high frequency component frequency of the light contact non-rubbing phase is relatively low, the high frequency component duration of the non-rubbing phase is long, the heavy contact is the opposite, and the non-rubbing phase with the high frequency component is narrow, so the severity and duration of rubbing can be determined by the frequency and duration of the periodically abrupt component, and in practice, the severity and duration of contact are the most concerned issues and are the important basis for flight quality assessment, so that the severity of contact during flight can be determined more effectively by the method proposed herein, and a better assessment result is obtained than the global methods such as FFT;
in the present invention, the LDV waveform caused by slider-disk contact is analyzed using the HHT method under three conditions of non-contact, micro-contact and heavy-contact, and by analyzing their primary Intrinsic Mode Functions (IMFs) and their transient frequencies (IFs), the following conclusions are made:
(1) both FFT and HHT can detect the contact frequency,
(2) the HHT can extract more detailed information about the amplitude of the vibration,
(3) in both the mild and severe cases, for some IMF components, the slider-to-disk engagement results in an increase in amplitude and a decrease in frequency,
(4) under the same heavy contact condition, the resonance frequency of both FFT and HHT appears at 360kHz,
(5) the severity and duration of rub-impact are judged by the frequency and time length of periodic mutation components obtained by HHT.
While the invention has been described above with reference to an embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the various features of the embodiments disclosed herein may be used in any combination, provided that there is no structural conflict, and the combinations are not exhaustively described in this specification merely for the sake of brevity and conservation of resources. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (5)
1. A touch slider sub-nanometer scale harmonic detection system based on Hilbert-Huang transform is characterized in that: the method comprises the following steps:
a measured piece;
the intrinsic mode function detection mechanism is arranged at the upper end of the tested piece and used for executing the intrinsic mode function detection of the tested piece;
and the transient frequency detection mechanism is connected with the tested piece and is used for executing the transient frequency detection of the tested piece.
2. The Hilbert-Huang transform-based touch slider sub-nanoscale harmonic detection system according to claim 1, wherein: the tested piece comprises a magnetic disk, a motor and a sliding block, wherein the motor is arranged at the bottom of the magnetic disk and drives the magnetic disk to rotate, the sliding block is suspended at the edge of the top of the magnetic disk, and the distance between the sliding block and the magnetic disk is 10 nanometers.
3. The Hilbert-Huang transform-based touch slider sub-nanoscale harmonic detection system according to claim 2, wherein: the inherent mode function detection mechanism comprises a laser Doppler velocity measurement sensor suspended at the upper ends of the magnetic disk and the sliding block, a first filter connected to one end, far away from the magnetic disk, of the laser Doppler velocity measurement sensor, and a first oscilloscope connected to one end, far away from the laser Doppler velocity measurement sensor, of the first filter, wherein the first oscilloscope is connected to a PC (personal computer) end.
4. The Hilbert-Huang transform-based touch slider sub-nanoscale harmonic detection system according to claim 3, wherein: the transient frequency detection mechanism comprises a signal adjuster connected to a sliding block, a second filter connected to the signal adjuster and far away from one end of the sliding block, an acoustic emission detector arranged on the sliding block, a preamplifier connected to the acoustic emission detector and far away from one end of the sliding block, a third filter connected to the preamplifier and far away from one end of the acoustic emission detector, and a second oscilloscope connected to the third filter and far away from one end of the preamplifier, wherein the second oscilloscope is connected with the second filter, and the second oscilloscope and the second filter are both connected to a PC (personal computer) end.
5. The Hilbert-Huang transform-based touch slider sub-nanoscale harmonic detection system according to claim 4, wherein: the size of the slide block is 0.85x0.7x0.23mm 3 。
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