CN102976156A - FIR (Finite Impulse Response) filtering method of tension sensing signal - Google Patents
FIR (Finite Impulse Response) filtering method of tension sensing signal Download PDFInfo
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- CN102976156A CN102976156A CN2012105370631A CN201210537063A CN102976156A CN 102976156 A CN102976156 A CN 102976156A CN 2012105370631 A CN2012105370631 A CN 2012105370631A CN 201210537063 A CN201210537063 A CN 201210537063A CN 102976156 A CN102976156 A CN 102976156A
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Abstract
The invention relates to an FIR (Finite Impulse Response) filtering method of a tension sensing signal. Because output voltage of a tension sensor often has larger noise, a certain difficulty is brought for subsequent tension control. According to the FIR filtering method, the output noise of the sensor can be greatly restricted by carrying out FIR low-pass filtering on a plurality of continuous output voltage values of the sensor, and therefore the output tension stability of a tension controller is improved.
Description
Technical field
The invention belongs to field of textile machinery, be specifically related to finite impulse response (FIR) filtering method of tension force transducing signal in a kind of tension control assembly.
Background technology
In modern textile machinery, the control of yarn is a very important problem, and the quality of fiber and yarn directly affects the tension force of yarn, and other parameters during production also can impact yarn tension.Tenslator mainly is the density that guarantees to keep certain when yarn is on being wound into bobbin and certain tension force, and overtension can make the elasticity cataphoretic failure, even causes broken yarn; On the other hand, also will guarantee certain uniform tension in the yarn winding process, if there is not tenslator, yarn tension can cataphoretic failure in the unwinding process.
At present, the yarn tension controller can be divided into servo-type tensioner, electronic type tensioner, magnetic force magnetic tension device, mechanical tension device etc. from high to low substantially by performance, and wherein the electronic type tension control assembly is because its higher cost performance has obtained more and more widely application.The electronic type tension control assembly feeds back to microcomputer chip to the tension signal that detects, and regulates and guarantee all even constant of yarn tension by the torque that changes motor.The key of electronic type tension control assembly is the accurate detection of tension signal, because the operating speed of sensor is higher, and the existing measured error of sensor itself etc., there is larger noise in the tension signal that causes detecting.Present existing electronic type tension control assembly is less to be processed this tension force transducing signal, certainly will bring certain difficulty to follow-up tension force control.
Summary of the invention
Purpose of the present invention overcomes the deficiencies in the prior art exactly, proposes a kind of FIR filtering method of tension force transducing signal, can effectively overcome the impact of tension pick-up noise, improves the output tension stability degree of tension control assembly.
Tension force transducing signal FIR filtering method of the present invention, concrete steps are:
(1) yarn in reeling is measured owing to overcome the corresponding output voltage values of moment of torsion that produces when magnetic hysteresis power is rotated under the tension force effect by the Hall element of electromagnetism magnetic hysteresis braking effect
,
(2) filtering output initial value is set
(3) for
, according to the FIR filtering output value of following formula recursion calculation pressure sensor:
Wherein above-mentioned filter coefficient is corresponding to the coefficient of step low-pass FIR filter.
The inventive method can overcome the impact of tension pick-up noise largely, improves the output tension stability degree of tension control assembly.
The specific embodiment
Below in conjunction with a specific embodiment of the present invention, describe the concrete steps of tension force transducing signal IIR filtering method of the present invention in detail.
(1) yarn in reeling is measured owing to overcome the corresponding output voltage values of moment of torsion that produces when magnetic hysteresis power is rotated under the tension force effect by the Hall element of electromagnetism magnetic hysteresis braking effect
,
(2) filtering output initial value is set
(3) for
, according to the FIR filtering output value of following formula recursion calculation pressure sensor:
Wherein above-mentioned filter coefficient is corresponding to the coefficient of step low-pass FIR filter.
Design the coefficient that obtains this FIR filter by the fdatool instrument under the MATLAB software among the present invention, the LPF cut-off frequecy of passband of selecting during design is 0.04 π, the stopband cutoff frequency is 0.2 π, and stopband attenuation is 20dB, and the FIR filter design method such as is at the corrugation methods.
In specific embodiments of the invention, drag yarn with three kinds of different constant-tensions respectively, the output voltage average that tension pick-up is corresponding is respectively 2.46V, 2.83V and 3.26V, and the output voltage standard variance of non-filtered is respectively 0.47V, 0.65V and 0.75V; And the pressure sensor filtering that obtains after application the inventive method output average is respectively 2.46V, 2.82V and 3.26V, and standard variance is respectively 0.09V, 0.10V and 0.14V.This shows, use the inventive method and can suppress largely the sensor output noise.
Claims (1)
1. the FIR filtering method of a tension force transducing signal is characterized in that the concrete steps of the method are:
(1) yarn in reeling is measured owing to overcome the corresponding output voltage values of moment of torsion that produces when magnetic hysteresis power is rotated under the tension force effect by the Hall element of electromagnetism magnetic hysteresis braking effect
,
(2) filtering output initial value is set
(3) for
, according to the FIR filtering output value of following formula recursion calculation pressure sensor:
Wherein filter coefficient is corresponding to the coefficient of step low-pass FIR filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105370631A CN102976156A (en) | 2012-12-13 | 2012-12-13 | FIR (Finite Impulse Response) filtering method of tension sensing signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105370631A CN102976156A (en) | 2012-12-13 | 2012-12-13 | FIR (Finite Impulse Response) filtering method of tension sensing signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102976156A true CN102976156A (en) | 2013-03-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012105370631A Pending CN102976156A (en) | 2012-12-13 | 2012-12-13 | FIR (Finite Impulse Response) filtering method of tension sensing signal |
Country Status (1)
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| CN (1) | CN102976156A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101470033A (en) * | 2007-12-28 | 2009-07-01 | 爱吉尔电子股份公司 | Yarn tension measuring apparatus |
| EP2266908A2 (en) * | 2009-06-23 | 2010-12-29 | Sentex Chemnitz GmbH | Method and assembly for contactless determination of the tensile force of thread |
-
2012
- 2012-12-13 CN CN2012105370631A patent/CN102976156A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101470033A (en) * | 2007-12-28 | 2009-07-01 | 爱吉尔电子股份公司 | Yarn tension measuring apparatus |
| EP2266908A2 (en) * | 2009-06-23 | 2010-12-29 | Sentex Chemnitz GmbH | Method and assembly for contactless determination of the tensile force of thread |
Non-Patent Citations (1)
| Title |
|---|
| 吕愉斌: "基于Nios软核的经纱张力控制***的研究", 《中国优秀硕士学位论文全文数据库 工程科技I辑》, no. 7, 15 July 2008 (2008-07-15), pages 6 - 19 * |
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Application publication date: 20130320 |