CN102963770A - IIR filtering method for tension sensing signals - Google Patents
IIR filtering method for tension sensing signals Download PDFInfo
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- CN102963770A CN102963770A CN2012105370646A CN201210537064A CN102963770A CN 102963770 A CN102963770 A CN 102963770A CN 2012105370646 A CN2012105370646 A CN 2012105370646A CN 201210537064 A CN201210537064 A CN 201210537064A CN 102963770 A CN102963770 A CN 102963770A
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Abstract
The invention relates to an IIR (Infinite Impulse Response) filtering method for tension sensing signals. As louder noise exists when tension sensors output voltages, certain difficulties are brought to the following tension control. According to the IIR filtering method, infinite impulse response lowpass filtering is conducted on the voltages output by the continuous sensors, and the sensors are effectively prevented from outputting the noise to a greater extent, so that 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 infinite impulse response (IIR) 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 IIR 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 IIR 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 IIR filtering output value of following formula recursion calculation pressure sensor:
Wherein above-mentioned filter coefficient is corresponding to the coefficient of step low-pass iir 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 IIR filtering output value of following formula recursion calculation pressure sensor:
Wherein above-mentioned filter coefficient is corresponding to the coefficient of step low-pass iir filter.
Design the coefficient that obtains this iir 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 filter type of selection is the Butterworth type.
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 2.49V, 2.85V and 3.25V, and standard variance is respectively 0.08V, 0.09V and 0.15V.This shows, use the inventive method and can suppress largely the sensor output noise.
Claims (1)
1. the IIR 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 IIR filtering output value of following formula recursion calculation pressure sensor:
Wherein filter coefficient is corresponding to the coefficient of step low-pass iir filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105370646A CN102963770A (en) | 2012-12-13 | 2012-12-13 | IIR filtering method for tension sensing signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105370646A CN102963770A (en) | 2012-12-13 | 2012-12-13 | IIR filtering method for tension sensing signals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102963770A true CN102963770A (en) | 2013-03-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012105370646A Pending CN102963770A (en) | 2012-12-13 | 2012-12-13 | IIR filtering method for tension sensing signals |
Country Status (1)
| Country | Link |
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| CN (1) | CN102963770A (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 CN2012105370646A patent/CN102963770A/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: 20130313 |