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Grid frequency setting double ellipse fitting method and its application

A frequency setting, double ellipse technology, applied in the direction of comprehensive factory control, electrical testing/monitoring, etc., can solve the problems of unsatisfactory detection effectiveness, interference, and inability to obtain estimated quantities, so as to achieve considerable economic benefits and improve detection The effect of improving the efficiency and increasing the degree of automation

Inactive Publication Date: 2015-07-29
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complex factors such as a large amount of noise in the actual field data used for the above analysis and calculation, the interference of the "ellipse fitting" test results, and some cases of actual stickiness, if the methods in the existing literature are used, but no estimate for the presence of viscous
That is to say, the methods proposed in the existing literature to detect the stickiness of pneumatic control valves have the problem of unsatisfactory detection effectiveness.

Method used

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  • Grid frequency setting double ellipse fitting method and its application
  • Grid frequency setting double ellipse fitting method and its application
  • Grid frequency setting double ellipse fitting method and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] like figure 1 As shown, the basic steps of the grid frequency setting double ellipse fitting method include:

[0030] S1, assignment, initialization, setting the upper limit f of the upper cut-off frequency of the bandpass filter Hmax and lower bound f Hmin , the upper limit f of the lower cut-off frequency Lmax and lower bound f Lmin , and the upper cutoff frequency step Step_H and the lower cutoff frequency step Step_L, assign 0 to i and P max ; for example, the upper limit f of the upper cutoff frequency of the bandpass filter Hmax is 0.5, the lower limit f Hmin is 0.02; the upper limit f of the lower cut-off frequency Lmax Less than 0.02, lower limit f Lmin is 0.001; the step size of the upper cut-off frequency Step_H is 0.01-0.05, and the step size of the lower cut-off frequency Step_L is 0.001-0.002.

[0031] S2. Use the double loop method to search for the upper and lower cut-off frequencies, the lower cut-off frequency is the outer loop, and the upper cu...

Embodiment 2

[0034] S1, assignment, initialization, setting the upper limit f of the upper cut-off frequency of the bandpass filter Hmax and lower bound f Hmin , the upper limit f of the lower cut-off frequency Lmax and lower bound f Lmin , and the upper cutoff frequency step Step_H and the lower cutoff frequency step Step_L, assign 0 to i and P max ; for example, the upper limit f of the upper cutoff frequency of the bandpass filter Hmax is 0.5, the lower limit fHmin is 0.02; the upper limit f of the lower cut-off frequency Lmax Less than 0.02, lower limit f Lmin is 0.001; the step size of the upper cut-off frequency Step_H is 0.01-0.05, and the step size of the lower cut-off frequency Step_L is 0.001-0.002. S2. Search the upper cut-off frequency and the lower cut-off frequency, and calculate the percentage of the subset data segment points between the inner ellipse and the outer ellipse accounting for all the points of the entire subset data segment; the inner ellipse is reduced by ...

Embodiment 3

[0040] The difference between this embodiment and the previous implementation is in step S2:

[0041] S2.21. For a given lower cut-off frequency f L , the upper cut-off frequency f H Follow the upper cutoff frequency step Size Step_H from the upper limit f Hmax lower down or from the lower limit f Hmin Increase upwards, for each set of given upper cutoff frequency and lower cutoff frequency, calculate the percentage P of the number of points in the subset data segment between the inner ellipse and the outer ellipse to all points in the entire subset data segment new ;

[0042] S2.22, the upper limit f of the lower cut-off frequency Lmax and lower bound f Lmin Between, change the lower cut-off frequency f according to the lower cut-off frequency step Step_L L value, repeat step S2.21; obtain the percentage P new The maximum percentage P in max , record the upper and lower cutoff frequencies corresponding to this percentage.

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Abstract

The invention discloses a method for setting double-ellipse fitting through grid frequencies. The method comprises the following steps: selecting cut-off frequency groups composed of upper cut-off frequencies and lower cut-off frequencies in the upper cut-off frequencies and the lower cut-off frequencies; aiming at each cut-off frequency group, calculating the percentage of the count of a subset data segment between an inner ellipse and an outer ellipse in all counts of the whole subset data segment; and finally obtaining the maximum percentage and the upper cut-off frequency and the lower cut-off frequency corresponding to the maximum percentage. The selection process of the upper cut-off frequencies and the lower cut-off frequencies of a band-pass filter is optimized. According to the method, the detection rate of the viscosity property can be increased, and the degree of automation of algorithm is increased.

Description

technical field [0001] The invention belongs to the technical field of a control circuit performance monitoring system, and in particular relates to a method for detecting a sticking fault in a pneumatic control valve. Background technique [0002] In continuous process industries such as electric power, steel, petroleum, chemical industry, etc., with the increasing production scale, the installed capacity of a single set of equipment is getting larger and larger, and it is very important for energy saving, cost control, production safety, product quality, and environmental protection. The requirements for indicators such as are also constantly improving, resulting in the role of process control in the entire production becoming more and more important. However, due to various reasons such as the increasing complexity of modern industrial processes and the lack of daily maintenance of a large number of controllers on site, there are a large number of problems of poor perform...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B23/02
CPCY02P90/02
Inventor 曹鸣
Owner SOUTHEAST UNIV