CN102402232A - Non-contact straightness measuring system and work frequency control method thereof - Google Patents

Non-contact straightness measuring system and work frequency control method thereof Download PDF

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Publication number
CN102402232A
CN102402232A CN2010102782664A CN201010278266A CN102402232A CN 102402232 A CN102402232 A CN 102402232A CN 2010102782664 A CN2010102782664 A CN 2010102782664A CN 201010278266 A CN201010278266 A CN 201010278266A CN 102402232 A CN102402232 A CN 102402232A
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frequency
value
threshold value
judge
weighted value
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魏哲华
李博
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Siemens Ltd China
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Siemens Ltd China
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Abstract

The invention relates to a non-contact straightness measuring system and a work frequency control method thereof. The control method includes following steps: (a), FFT (FAST Fourier transform) with multiple sampling points is utilized to analyzing work frequency, a frequency spectrogram of the work frequency is obtained, and existing work frequency points are confirmed, (b), the best work frequency is calculated by the aid of window function weighting and scaling, (c), whether the work frequency is interfered or not is judged, and distribution conditions of interference frequency is determined, and (d), the work frequency is adjusted according to the interference frequency distribution conditions determined by the step (c) and the best work frequency calculated by the step (b), or the work efficiency is adjusted according to the interference frequency distribution conditions determined by the step (c). By the aid of the method, the non-contact straightness measuring system can control the work frequency in real time, the interference frequency can be avoided automatically to the utmost extent, and the work frequency always keeps better.

Description

The method for controlling operating frequency and the measuring system thereof of noncontact flatness measurement system
Technical field
The present invention relates to the method for controlling operating frequency and the measuring system thereof of noncontact flatness measurement system, relate in particular to a kind of method for controlling operating frequency and measuring system thereof of the noncontact flatness measurement system when cold-rolled steel sheet.
Background technology
In the cold-rolled steel sheet process, the measurement of strip profile and flatness can realize through noncontact flatness measurement system (SiFlat), compares with traditional contact radial force measuring technique, and this method can avoid scratching belt steel surface.Noncontact flatness measurement technology is in band steel bottom frequency conversion fan to be installed, and takes the air below the band steel away, forms different air pressures in both sides up and down at the band steel; Thereby the band steel is moved down, in the air channel of band steel bottom, eccentric roller is installed, can control the switching in air channel through eccentric roller; Make the air of band steel bottom produce periodic swinging; Thereby cause the periodic vibration of band steel, electricity consumption vortex flow sensor band steel amplitude, the amplitude that records can be exchanged into the flatness of band steel.
In process of production; In order to guarantee degree of accuracy, noncontact flatness measurement system can come the amplitude of closed-loop control band steel through the control of conversion blower fan, during with assurance production products of different specifications; The average amplitude basically identical of band steel makes electric vortex flow working sensor in the optimum measurement scope.
But in actual use; Measurement result can receive the interference of other vibration frequencies; Existing solution is the rotating speed according to other vibration frequency adjustment eccentric rollers; Band steel periodic vibration frequency is distinguished with being with other vibration frequencies in the steel production, and, exclude other outer vibrations of vibration frequency of setting through the frequency of operation of noncontact flatness measurement system is carried out fast Fourier transform (FFT); Make and have only the band steel vibration consistent just to be used, thereby can measure the flatness of band steel uninterruptedly by noncontact flatness measurement system with the eccentric roller rotational frequency.
But because the interfering frequency that other vibrations produce also is constantly to change; And the problem of spectral leakage appears in unescapable meeting when carrying out the FFT parsing; So resolve through the frequency of operation of noncontact flatness measurement system being carried out FFT; Interfering frequency can not be got rid of fully, the testing result of strip profile and flatness will be interfered with.
Summary of the invention
Therefore need further avoid interference frequency, the frequency of operation of noncontact flatness measurement system remained on the preferable frequency of operation, and also do not have correlation technique to overcome the above problems at present.
An object of the present invention is to provide the method for controlling operating frequency of a kind of noncontact flatness measurement system; Carry out the step of the inventive method through circulation; Can control the frequency of operation of noncontact flatness measurement system in real time, can maximum possible avoid interference frequency automatically, strengthen the robustness of measuring system; The frequency of operation of noncontact flatness measurement system is remained on the preferable frequency of operation, improve the accuracy of strip profile and flatness testing result.
Another object of the present invention provides a kind of noncontact flatness measurement system, can the Control work frequency remain on the preferable frequency of operation, improves the accuracy of strip profile and flatness testing result.
The method for controlling operating frequency of noncontact flatness measurement of the present invention system comprises:
(a) adopt the FFT of many sampled points that frequency of operation is resolved, obtain the spectrogram of frequency of operation, confirm the work on hand Frequency point;
(b) utilize window function weighted sum convergent-divergent calculating optimum frequency of operation;
(c) whether the judgment task frequency is disturbed, and determines the distribution situation of interfering frequency;
The OWF adjustment frequency of operation that the distribution situation of the interfering frequency of (d) judging according to step (c) and step (b) are calculated, the distribution situation of the interfering frequency of perhaps judging according to step (c) is adjusted frequency of operation.
In a kind of exemplary embodiment of the method for controlling operating frequency of noncontact flatness measurement of the present invention system, step (c) further comprises:
(ca), obtain left side weighted value E respectively to the range value distribution weighting of the left and right sides of the work on hand Frequency point in the spectrogram lWith right side weighted value E rIf, left side weighted value E lMore than or equal to threshold value T, if perhaps right side weighted value E rMore than or equal to threshold value T, judge that then frequency of operation is interfered;
(cb) whether the phase place of the complex result of the FFT of detection work on hand Frequency point drifts about, if drift judges then that greater than threshold value U frequency of operation is interfered;
(cc) obtain the distribution situation of interfering frequency according to step (ca), (cb), get into step (d).
In a kind of exemplary embodiment of the method for controlling operating frequency of noncontact flatness measurement of the present invention system, wherein step (ca) further comprises:
Obtain left side weighted value E respectively through following two formula lWith right side weighted value E r
E l = Σ i = 1 m ( A σ - i * W i )
E r = Σ i = 1 m ( A σ + i * W i )
In the formula: Ai is the range value that obtains after frequency of operation is resolved through FFT,
The a series of weighted values of Wi for from spectrogram figure, learning,
Figure BSA00000264889000023
i＝0，1，...，m。
In a kind of exemplary embodiment of the method for controlling operating frequency of noncontact flatness measurement of the present invention system, wherein the m value of above-mentioned formula is 12.
In a kind of exemplary embodiment of the method for controlling operating frequency of noncontact flatness measurement of the present invention system, wherein step (d) further comprises:
If judge left side weighted value E according to step (ca) lMore than or equal to threshold value T, and frequency of operation exceeds maximum limit, then jumps to OWF;
If judge right side weighted value E according to step (ca) rMore than or equal to threshold value T, and frequency of operation exceeds lower limit, then jumps to OWF;
If judge left side weighted value E according to step (ca) lMore than or equal to threshold value T, and right side weighted value E rMore than or equal to threshold value, then frequency of operation jumps to OWF;
If judge the phase place of complex result of the FFT of work on hand Frequency point according to step (cb) drift is arranged, drift is greater than threshold value U, and then frequency of operation jumps to OWF;
If judge left side weighted value E according to step (ca) lMore than or equal to threshold value T, and frequency of operation do not exceed maximum limit, and then frequency of operation is finely tuned to height;
If judge right side weighted value E according to step (ca) rMore than or equal to threshold value T, and frequency of operation do not exceed lower limit then frequency of operation to low fine setting;
If judge left side weighted value E according to step (ca) lWith right side weighted value E rAll, then keep frequency of operation constant less than threshold value T.
In a kind of exemplary embodiment of the method for controlling operating frequency of noncontact flatness measurement of the present invention system, step (b) further comprises:
(ba) obtain a series of range value Amp (f) with many sampled points FFT result;
(bb) handle through the distribution of range value Amp (f) being carried out window function weighted sum convergent-divergent, when obtaining frequency and being f by the assessed value disturb of interfering frequency (f):
disturb ( f ) = Σ i = 0 k [ W i · Amp ( f ± f · i σ ) ]
In the formula:
The a series of weighted values of Wi for from spectrogram figure, learning,
Figure BSA00000264889000032
i＝0，1，...，k；
(bc) frequency of calculating optimum frequency of operation: disturb (f) when getting minimum value is OWF.
In a kind of exemplary embodiment of the method for controlling operating frequency of noncontact flatness measurement of the present invention system, the k value of above-mentioned formula is 10.
The present invention also provides a kind of noncontact flatness measurement system that adopts method for controlling operating frequency of the present invention.
Method for controlling operating frequency of the present invention is a cyclic process, at first utilizes many sampled points FFT that frequency of operation is resolved, and obtains spectrogram and confirms the work on hand Frequency point in the drawings.Utilize window function weighted sum convergent-divergent calculating optimum frequency of operation point then; Carry out weighting through the range value in the spectrogram is distributed, and whether the phase place of complex result that detects the FFT of work on hand Frequency point drift about, judge whether frequency of operation is disturbed.Through testing result is judged, adjustment work on hand frequency obtains new frequency of operation, and finishes this circulation, makes new frequency of operation get into next cycle period at last.
Whether method for controlling operating frequency of the present invention can automatically detect frequency of operation with the noncontact flatness measurement system that utilizes the method and disturbed; And can find out preferable frequency of operation automatically; Make noncontact flatness measurement system have the ability that can avoid interference, can make frequency of operation reach preferable frequency of operation by self regulating and control.
Description of drawings
Fig. 1 carries out the schematic spectrogram that obtains after many sampled points FFT resolves according to the control method of noncontact flatness measurement system works frequency to frequency of operation.
Fig. 2 is the schematic flow sheet of a kind of exemplary embodiment of control method of noncontact flatness measurement system works frequency.
Fig. 3 is the schematic flow sheet that passes through a kind of exemplary embodiment of window function weighted sum convergent-divergent calculating optimum frequency of operation according to the control method of noncontact flatness measurement system works frequency.
Whether Fig. 4 is disturbed according to the control method judgment task frequency of noncontact flatness measurement system works frequency, and determines a kind of schematic flow sheet of exemplary embodiment of the distribution situation of interfering frequency.
Embodiment
To combine specific embodiments that method of the present invention is done more detailed explanation below.It will be appreciated by those skilled in the art that following embodiment all is used for the present invention's scope required for protection is carried out the description of exemplary, summarize the relative scope of each parameter of the present invention, thereby can not it be interpreted as a kind of concrete restriction of the present invention with this.
Fig. 1 is for carrying out the schematic spectrogram that obtains after many sampled points FFT resolves according to the method for controlling operating frequency of noncontact flatness measurement system to frequency of operation, and wherein the X axle is represented the frequency of operation point, and the Y axle is represented range value.
Fig. 2 is the schematic flow sheet of a kind of exemplary embodiment of method for controlling operating frequency of noncontact flatness measurement system.As shown in the figure:
Step S10: adopt the FFT of many sampled points that frequency of operation is resolved, obtain spectrogram as shown in Figure 1, from Fig. 1, can confirm the work on hand Frequency point according to the amplitude distribution in the spectrogram, the A point is the work on hand Frequency point among Fig. 1.Get into step S20 and step S30 then.
Step S20: utilize window function weighted sum convergent-divergent calculating optimum frequency of operation, get into step S40 then.
Step S30: whether the judgment task frequency is disturbed, and determines the distribution situation of interfering frequency, gets into step S40 then.
Step S40: get into and judge controlled step; The distribution situation of the interfering frequency of judging according to step S30 is adjusted frequency of operation with the OWF that step S20 calculates; The distribution situation adjustment frequency of operation of the interfering frequency of perhaps judging according to step S30 gets into step S50 then.
Step S50: frequency of operation control back is obtained new frequency of operation.
After obtaining new frequency of operation, the one-period of this method finishes, and gets into next cycle and through this method new frequency of operation is judged again and adjusted.Each FFT sampling period is a work period of the present invention.
Fig. 3 is the schematic flow sheet that passes through window function weighted sum convergent-divergent calculating optimum frequency of operation according to the method for controlling operating frequency of noncontact flatness measurement system.
Combine Fig. 3 to specify a kind of exemplary embodiment of step S20 at present.
As shown in the figure:
Step S22: obtain a series of range value Amp (f) with many sampled points FFT result.Frequency condition is: frequency step=0.125HZ, frequency range is 3～14HZ.Get into step S24.
It will be understood by those skilled in the art that the desired frequency condition of step S22 can change because of the external condition influence to some extent, is not limited to frequency condition of the present invention.
Step S24: window function weighted sum convergent-divergent is carried out in the distribution of range value Amp (f) handles, when obtaining frequency and being f by the assessed value disturb of interfering frequency (f), get into step S26 then.The formula that calculates disturb (f) is following:
disturb ( f ) = Σ i = 0 k [ W i · Amp ( f ± f · i σ ) ]
In the formula: a series of weighted values of Wi for from spectrogram figure, learning,
Figure BSA00000264889000042
i＝0，1，…，k。
Wherein the k value can be adjusted for the debugging measured data, in a kind of exemplary embodiment of the inventive method, and k=10.
Step S26: calculate the minimum value of disturb (f) in the certain frequency scope, the frequency during minimum value is an OWF, gets into step S40 then.Frequency range: 4～11HZ.
It will be understood by those skilled in the art that the desired frequency range of step S26 can change because of the external condition influence to some extent, is not limited to frequency range of the present invention.
Whether Fig. 4 is disturbed according to the method for controlling operating frequency judgment task frequency of noncontact flatness measurement system, and determines the schematic flow sheet of the distribution situation of interfering frequency.
Combine Fig. 4 to specify a kind of exemplary embodiment of step S30 at present.
As shown in the figure:
Step S32:, obtain left side weighted value E respectively to the range value distribution weighting of the left and right sides of the work on hand Frequency point in the spectrogram lWith right side weighted value E rIf, left side weighted value E lMore than or equal to threshold value T, if perhaps right side weighted value E rMore than or equal to threshold value T, judge that then frequency of operation is interfered.Get into step S36 then.
Wherein, threshold value T is the debugging measured data, because number of sensors is different, the value of T also can be different, in a kind of exemplary embodiment of the inventive method, and T=260.
In a kind of exemplary embodiment of step S32, E lAnd E rCan draw through following two formula:
E l = Σ i = 1 m ( A σ - i * W i )
E r = Σ i = 1 m ( A σ + i * W i )
In the formula: Ai is the range value that obtains after frequency of operation is resolved through FFT,
The a series of weighted values of Wi for from spectrogram figure, learning,
Figure BSA00000264889000053
i＝0，1，...，m。
It will be understood by those skilled in the art that the m value is the debugging measured data, can adjust that the m value is 12 in a kind of exemplary embodiment of the inventive method.
Step S34: whether the phase place of the complex result of the FFT of detection work on hand Frequency point drifts about, if drift judges then that greater than threshold value U the work on hand frequency is interfered, gets into step S36.
Wherein, threshold value U can adjust for the debugging measured data, in a kind of exemplary embodiment of the inventive method, and U=10.
Step S36: the distribution situation through step S33, S34 judge interfering frequency gets into step S40.
A kind of exemplary embodiment of step S40 is:
If judge left side weighted value E according to step S32 lMore than or equal to threshold value T, and frequency of operation then jumps to OWF above the upper limit;
If judge right side weighted value E according to step S32 rMore than or equal to threshold value T, and frequency of operation then jumps to OWF above lower limit;
If judge left side weighted value E according to step S32 lMore than or equal to threshold value T, and right side weighted value E rMore than or equal to preset threshold T, then frequency of operation jumps to OWF;
If judge the phase place of complex result of the FFT of work on hand Frequency point according to step S34 drift is arranged, drift is greater than threshold value U, and then frequency of operation jumps to OWF;
If judge left side weighted value E according to step S32 lMore than or equal to threshold value T, and frequency of operation surpasses the upper limit, and then frequency of operation is finely tuned to height;
If judge right side weighted value E according to step S32 rMore than or equal to threshold value T, and frequency of operation surpasses lower limit, and then frequency of operation is to low fine setting;
If judge left side weighted value E according to step S32 lWith right side weighted value E rAll, then keep frequency of operation constant less than threshold value T.
The measured data of the upper and lower bound value that it will be understood by those skilled in the art that frequency of operation during for debugging, value can be according to circumstances and different, and upper limit value is 12HZ in a kind of exemplary embodiment of the inventive method, and the lower limit value is 5HZ.
Method for controlling operating frequency through noncontact flatness measurement of the present invention system; Can make the noncontact flatness measurement system real-time regulated of utilizing the method; Whether automatically detect frequency of operation is disturbed; And can find out preferable frequency of operation automatically, guarantee the accuracy of testing result.
In this article, " schematically " expression " is served as instance, example or explanation ", should any diagram, the embodiment that be described to " schematically " in this article be interpreted as a kind of preferred or have more the technical scheme of advantage.
Be to be understood that; Though this instructions is described according to each embodiment; But be not that each embodiment only comprises an independently technical scheme, this narrating mode of instructions only is for clarity sake, and those skilled in the art should make instructions as a whole; Technical scheme among each embodiment also can form other embodiments that it will be appreciated by those skilled in the art that through appropriate combination.
The listed a series of detailed description of preceding text only is specifying to feasibility embodiment of the present invention; They are not in order to restriction protection scope of the present invention, allly do not break away from equivalent embodiment or the change that skill of the present invention spirit done and all should be included within protection scope of the present invention.

Claims (9)

1. the method for controlling operating frequency of a noncontact flatness measurement system comprises:
(a) adopt the FFT of many sampled points that frequency of operation is resolved, obtain the spectrogram of said frequency of operation, confirm the work on hand Frequency point;
(b) utilize window function weighted sum convergent-divergent calculating optimum frequency of operation;
(c) judge whether said frequency of operation is disturbed, and determine the distribution situation of interfering frequency;
The distribution situation of the said interfering frequency of (d) judging according to said step (c) and the said OWF that said step (b) is calculated are adjusted said frequency of operation, and the distribution situation of the said interfering frequency of perhaps judging according to said step (c) is adjusted said frequency of operation.
2. method for controlling operating frequency as claimed in claim 1, said step (c) further comprises:
(ca), obtain left side weighted value E respectively to the range value distribution weighting of the left and right sides of the said work on hand Frequency point in the said spectrogram lWith right side weighted value E rIf, said left side weighted value E lMore than or equal to threshold value T, if perhaps said right side weighted value E rMore than or equal to said threshold value T, judge that then said frequency of operation is interfered;
(cb) whether the phase place of the complex result of the FFT of the said work on hand Frequency point of detection drifts about, if said drift, judges then that said frequency of operation is interfered greater than threshold value U;
(cc) obtain the distribution situation of said interfering frequency according to said step (ca), (cb), get into said step (d).
3. method for controlling operating frequency as claimed in claim 2, wherein said step (ca) further comprises:
Obtain said left side weighted value E respectively through following two formula lWith said right side weighted value E r
E l = Σ i = 1 m ( A σ - i * W i )
E r = Σ i = 1 m ( A σ + i * W i )
In the formula: Ai is the range value that obtains after said frequency of operation is resolved through FFT,
The a series of weighted values of Wi for from said spectrogram figure, learning,
Figure FSA00000264888900013
i＝0，1，...，m。
4. method for controlling operating frequency as claimed in claim 3, wherein said m value is 12.
5. method for controlling operating frequency as claimed in claim 2, said step (d) further comprises:
If judge said left side weighted value E according to said step (ca) lMore than or equal to said threshold value T, and said frequency of operation exceeds maximum limit, then jumps to said OWF;
If judge said right side weighted value E according to said step (ca) rMore than or equal to said threshold value T, and said frequency of operation exceeds lower limit, then jumps to said OWF;
If judge said left side weighted value E according to said step (ca) lMore than or equal to said threshold value T, and said right side weighted value E rMore than or equal to said threshold value, then said frequency of operation jumps to said OWF;
If judge the phase place of complex result of the FFT of said work on hand Frequency point according to said step (cb) drift is arranged, said drift is greater than threshold value U, and then said frequency of operation jumps to said OWF;
If judge said left side weighted value E according to said step (ca) lMore than or equal to said threshold value T, and said frequency of operation do not exceed maximum limit, and then said frequency of operation is finely tuned to height;
If judge said right side weighted value E according to said step (ca) rMore than or equal to said threshold value T, and said frequency of operation do not exceed lower limit, and then said frequency of operation is to low fine setting;
If judge left side weighted value E according to said step (ca) lWith right side weighted value E rAll, then keep said frequency of operation constant less than said threshold value T.
6. method for controlling operating frequency as claimed in claim 3, said step (d) further comprises:
If judge said left side weighted value E according to said step (ca) lMore than or equal to said threshold value T, and said frequency of operation exceeds maximum limit, then jumps to said OWF;
If judge said right side weighted value E according to said step (ca) rMore than or equal to said threshold value T, and said frequency of operation exceeds lower limit, then jumps to said OWF;
If judge said left side weighted value E according to said step (ca) lMore than or equal to said threshold value T, and said right side weighted value E rMore than or equal to said threshold value, then said frequency of operation jumps to said OWF;
If judge the phase place of complex result of the FFT of said work on hand Frequency point according to said step (cb) drift is arranged, said drift is greater than threshold value U, and then said frequency of operation jumps to said OWF;
If judge said left side weighted value E according to said step (ca) lMore than or equal to said threshold value T, and said frequency of operation do not exceed said maximum limit, and then said frequency of operation is finely tuned to height;
If judge said right side weighted value E according to said step (ca) rMore than or equal to said threshold value T, and said frequency of operation do not exceed said lower limit, and then said frequency of operation is to low fine setting;
If judge left side weighted value E according to said step (ca) lWith right side weighted value E rAll, then keep said frequency of operation constant less than said threshold value T.
7. method for controlling operating frequency as claimed in claim 1, wherein said step (b) further comprises:
(ba) obtain a series of range value Amp (f) with many sampled points FFT result;
(bb) handle through the distribution of said range value Amp (f) being carried out window function weighted sum convergent-divergent, when obtaining frequency and being f by the assessed value disturb of interfering frequency (f):
disturb ( f ) = Σ i = 0 k [ W i · Amp ( f ± f · i σ ) ]
In the formula:
The a series of weighted values of Wi for from said spectrogram figure, learning,
Figure FSA00000264888900022
i＝0，1，...，k；
(bc) calculating the frequency of said OWF: disturb (f) when getting minimum value is OWF.
8. method for controlling operating frequency as claimed in claim 7, wherein said k value is 10.
9. utilize the noncontact flatness measurement system of the described method for controlling operating frequency of arbitrary claim in the claim 1 to 8.
CN2010102782664A 2010-09-10 2010-09-10 Non-contact straightness measuring system and work frequency control method thereof Pending CN102402232A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103279119A (en) * 2013-05-02 2013-09-04 东南大学 Method for setting double-ellipse fitting through grid frequencies and applications thereof
CN104731086A (en) * 2013-05-02 2015-06-24 东南大学 Grid frequency setting double-ellipse fitting method and application adopting same

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0560510A (en) * 1991-09-04 1993-03-09 Nippon Jiki Kogyo Kk Flatness measurement and magnetic particle inspection method for metallic component
JPH05248813A (en) * 1992-03-02 1993-09-28 Olympus Optical Co Ltd Data processing apparatus of scanning probe microscope
CN1502424A (en) * 2002-11-20 2004-06-09 Posco��ʽ���� Fault diagnosis apparatus and method for hot fine rolling band steel
CN101203334A (en) * 2005-06-23 2008-06-18 西门子Vai金属技术股份公司 Method and device for controlling a rolled product thickness at a tandem rolling mill output

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0560510A (en) * 1991-09-04 1993-03-09 Nippon Jiki Kogyo Kk Flatness measurement and magnetic particle inspection method for metallic component
JPH05248813A (en) * 1992-03-02 1993-09-28 Olympus Optical Co Ltd Data processing apparatus of scanning probe microscope
CN1502424A (en) * 2002-11-20 2004-06-09 Posco��ʽ���� Fault diagnosis apparatus and method for hot fine rolling band steel
CN101203334A (en) * 2005-06-23 2008-06-18 西门子Vai金属技术股份公司 Method and device for controlling a rolled product thickness at a tandem rolling mill output

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103279119A (en) * 2013-05-02 2013-09-04 东南大学 Method for setting double-ellipse fitting through grid frequencies and applications thereof
CN104731086A (en) * 2013-05-02 2015-06-24 东南大学 Grid frequency setting double-ellipse fitting method and application adopting same
CN104865920A (en) * 2013-05-02 2015-08-26 东南大学 Method for setting double-ellipse fitting through grid frequencies and capable of improving pneumatic control valve viscosity degree detection ratio
CN104865920B (en) * 2013-05-02 2017-06-20 东南大学 The grid frequency setting bielliptic(al) approximating method of the viscous degree recall rate of pneumatic control valve can be improved

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Application publication date: 20120404