CN102506682A

CN102506682A - Method for distinguishing apparent parameters of bunchy yarns

Info

Publication number: CN102506682A
Application number: CN201110289137XA
Authority: CN
Inventors: 练军; 徐伯俊
Original assignee: Jiangnan University
Current assignee: Jiangnan University
Priority date: 2011-09-27
Filing date: 2011-09-27
Publication date: 2012-06-20

Abstract

The invention discloses an exact method for distinguishing apparent parameters of bunchy yarns. The method comprises the steps of: converting capacitance change caused by density differences of bunchy yarns into continuous change of output voltage by a capacitive transducer, and transmitting the continuous change into a computer to be converted into a discrete time sequence signal after analogue-to-digital conversion. According to the method disclosed by the invention, slub length, slub space and slub amplitude are determined by a signal handler so that the design circle rules of the bunchy yarns are further determined; and the labor intensity can be reduced and the labor production efficiency can be improved in copying and production control processes of the bunchy yarns.

Description

A kind of recognition methods of slub apparent parameter

Technical field

The present invention relates to a kind of computer Recognition method of slub apparent parameter.

Background technology

Slub is a kind of of FANCY YARNS, and the fabrics cloth cover that is made into slub has relief effect, is widely used in fields such as denim, high-grade underwear and adornment.The slub length of slub, slub space and ring multiplying power are three main technological parameters, are determining the outward appearance of fabric that slub is made into.Domestic detection to the slub apparent parameter at present all is the method that adopts manual detection, and it is not high to exist measuring accuracy, and therefore the drawback that wastes time and energy presses for a kind of method that fast and effeciently detects the slub apparent parameter of invention.

Summary of the invention

The present invention adopts parallel plate capacitor to become voltage signal to the thickness conversion of signals of the slub through therebetween, is input to computing machine analysis through analog to digital conversion.Because checkout equipment and precision and external interference, there is certain noise in the data that collected, therefore must carry out Filtering Processing earlier to the signal that collects, elimination high frequency noise, the accuracy of identification of raising slub apparent parameter.

When definite slub base yarn number was counted, the method that adopts ordering to divide into groups was confirmed basic yarn number number thereby find out class mean.Adopt the method for first order difference to confirm the acquired signal local maximum.The confirming of ring and basic yarn separation rises through statistics, and the algebraic sum of the accumulative total and the accumulative total that descends confirms, thus through calculate between right separation of ring and the left separation difference and and setting threshold compare bimodal on the noise peak got rid of on the basic yarn and the ring.

Description of drawings

The slub signal that Fig. 1 collects for parallel plate capacitor of the present invention.

Fig. 2 is definite figure of ring and basic yarn separation.

Fig. 3 is a slub apparent parameter detection system process flow diagram.

Fig. 4 is the sequence chart of slub length and slub space.

Embodiment

Below in conjunction with practical implementation the present invention is done further to set forth in detail.

The plane-parallel capacitor of

the TEST I type detection head that adopts converts the non-electric charge quantity signalling of yarn linear density into electric quantity signal; The width of capacity plate antenna is to adopt 8mm; Slub is 50 meters/minute through the speed of parallel plate electrode; Adopt 64 capture card samplings, SF is 900HZ.After the A/D conversion, send into computing machine; Become discrete signal; Seek local peaking and add up the separation that rising and accumulative total descent method are confirmed ring and basic yarn through first difference method, draw the parameters such as slub length, slub space and ring multiplying power of slub, seeing a pair of combination to adjacent slub length and slub space; Represent with vertical line that on two dimensional surface ring and slub space are represented with various colors.After all combination diagrams, through observing the colored type circulation that to confirm slub, shown in accompanying drawing.

Data to collecting are carried out the wave spectrogram that Fourier transform draws slub; And the apparent parameter that obtains with the front combines the circulation law of analyzing slub; Simulate the outside drawing and the square wave figure of slub, can show each item apparent parameter of slub more intuitively.

Claims

1. slub converts the different thicknesses in the certain fragment of slub to through parallel plate capacitor formula sensor the variation of parallel plate electrode electric capacity with certain speed; Further convert the variation of voltage again to; Carry out analog to digital conversion input computing machine through data collecting card and become discrete time series signal, shown in accompanying drawing 1.Discrete signal is carried out signal Processing, confirm slub length, slub space and ring multiplying power, shown in accompanying drawing 2, thus the outward appearance geometric parameter of definite slub.

2. the acquisition method of slub apparent parameter signal according to claim 1; It is characterized in that: (1) slub speed with 50 meters/minute after the roller traction is the parallel plate electrode electric capacity of 8mm through width; Adopt the capture card more than 32, SF is 900HZ.(2) in order to eliminate random noise signal, the voltage signal of output will pass through LPF and amplification earlier, so that signal Processing subsequently, shown in accompanying drawing 3.

3. according to definite method of right 1 described slub apparent parameter, it is characterized in that: (1) is sorted, is divided into groups the discrete series signal of input computing machine, thereby finds out the basic yarn diameter that class mean is confirmed slub.(2) the discrete-time series signal to the input computing machine carries out local optimal searching; Combine first difference method to find out local maximum simultaneously; For ghost peak that occurs at the slub space place or the bimodal misjudged situation on the ring, can be in definite ring left and right sides eliminate during separation.(3) ring and basic yarn separation confirm rise through statistics that the algebraic sum of the accumulative total and the accumulative total that descends confirms, thereby through calculate between right separation of ring and the left separation difference and and setting threshold compare bimodal on the noise peak got rid of on the basic yarn and the ring.

4. according to definite method of right 1 described slub flower type circulation law, it is characterized in that: seeing a pair of combination to adjacent slub length and slub space, on two dimensional surface, representing that ring and slub space are represented with various colors with vertical line.After all combination diagrams, through observing the colored type circulation that to confirm slub, shown in Figure of description 4.