Delayed setting method for self-regulated uniformity open-circuit controller
An open-loop controller and self-leveling technology, applied in the direction of electric controller, electrical program control, deburring device, etc., can solve the problems of narrowing the value range, cumbersome time-consuming, low calculation accuracy, etc., to reduce the number of tests , The effect of improving the level of setting automation and high precision
Inactive Publication Date: 2007-02-28
SHANGHAI JIAO TONG UNIV
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[0003] After searching the existing technical documents, it was found that Wu Min discussed in the article "Mechanism and Process Test of USC Draw Frame Autolevelling Device" on pages 143-147 of "Cotton Textile Technology", Volume 26, No. 3, 1998 Geometric calculation method and dichotomous refinement method based on experiments: The geometric calculation method gives a formula related to the size of the equipment and the average length of the processed fiber, but its calculation accuracy is low, and it is generally only suitable for rough estimation or dichotomy The refinement method provides the initial value; the dichotomous refinement method based on the test, selects two values around the value recommended by the equipment manufacturer for the test, narrows the value range by analyzing the test results, and repeats this process to gradually narrow the value range. Satisfactory open-loop controller delay is obtained by final tuning, but this method is inconvenient to operate, tedious and time-consuming
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[0024] The following examples are provided in conjunction with the content of the method of the present invention:
[0025] This embodiment is adopted on a FA398 high-speed autoleveler draw frame of a joint stock company. The main machine is FA398 single-eye high-speed draw frame, and the control system adopts an integrated autoleveling control and online monitoring system. An open-loop controller that checks first and then controls is used. The implementation steps of this embodiment are as follows:
[0026] ①Set the delay τ of the sliver from the input detection point to the output detection point 1 , start the operation with fixed feeding sliver speed and output sliver speed, and set the linear density of sliver detected at the input detection point as ρ 1 (t), the linear density of the sliver detected at the output detection point is ρ 2 (t), then ρ 1 (t), ρ 2 (t) The waveforms of the two curves are similar but staggered from each other for a period of time, as shown...
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The invention relates to a method for delaying adjusting the self-adjust open controller, wherein the alternated time of two curvatures is the delay time of cotton bar from input detecting point to the output detecting point asTau1; the Tau relative to maximum cross-correlation function is needed delayTau1 from the input detecting point to the output detecting point; delayTau2 is the adjusted cotton bar from the comb speed-variable point to the output detecting point; and the Tau relative to maximum cross-correlation function is the time delayTau2 from the comb speed-variable point to the outlet detecting point; the invention calculates the time delay Tau of open controller as reducing the time delay from input detecting point to the output detecting point, from the time from comb speed-variable point to the output detecting point, thatTau=Tau1-Tau2. The invention only needs two groups of test data, to reduce the test times and improve the automatic degrees, compared with secondary test method.
Description
technical field [0001] The invention relates to a method in the technical field of automatic control, in particular to a method for delay setting of an autoleveler open-loop controller. Background technique [0002] Autoleveling control is widely used in textile machinery represented by carding machine and draw frame to improve the unevenness of delivery weight and improve the final yarn quality. An effective method to achieve short or ultra-short segment autoleveling control is to use an open-loop controller. The open-loop controller first detects the sliver (the cotton layer in the carding machine, and the sliver in the drawing frame, hereinafter referred to as: cotton sliver) linear density, and then control the draft ratio to adjust the linear density of the output sliver, which has the characteristics of strong pertinence. Theoretically speaking, if the time delay of the controller is properly matched with the time required between the sliver passing the detection poin...
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IPC IPC(8): G05B19/02G05B11/01D01G15/36
Inventor 张贵宝张秋涓李从心
Owner SHANGHAI JIAO TONG UNIV