JPH0559685A - Controller for paper-making machine - Google Patents

Abstract

PURPOSE:To carry out the delicate control calculation of a papermaking machine in high efficiency by referring a memory containing plural sets of corresponding standard output patterns for each standard deviation pattern and determining the optimum operation extent independent of the type of the paper-making machine. CONSTITUTION:An operation rule memory part 20 contains plural sets of standard deviation patterns TDVH and corresponding standard output patterns MPV. The control deviation pattern DVH' and the standard deviation pattern are corrected by the optimum gain Go in a normalizing operation part 22 and the compatibility is calculated by a compatibility calculation part 24. An output pattern adjusting part 26 corrects the standard output pattern using the gain. The calculation control part 28 performs a series of the above calculation for each operation terminal on each standard deviation pattern stored in the operation rule memory. The control deviation determining part 30 performs the weighted calculation of the output pattern obtained by the output pattern adjusting part according to the compatibility of each standard deviation pattern for each operation terminal to obtain the execution control deviation E'n for the operation terminal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a paper machine or a coating machine used in the paper manufacturing industry, and more particularly to an improvement for efficiently performing fine control calculation.

[0002]

2. Description of the Related Art The applicant of the present invention has disclosed, for example, in Japanese Patent Laid-Open No. 63-120
Japanese Patent No. 191 proposes a so-called PI operation type control device. In the PI calculation type, the output value calculated with respect to the control deviation is distributed to the operation terminals before and after the control value at a constant rate for output, for example, according to the following formula.

[Equation 1] As a result, a phenomenon peculiar to profile control is dealt with in that, when one operating end is moved, the control amount before and after the operating end is also affected.

[0003]

However, the output of the PI operation type is distributed by multiplying the control output of the operating end by a certain ratio, and therefore, there is the following problem. The output is also output to the operating end with no control deviation. Control deviation with a short wavelength (for example, 1-2 of the operating end interval)
However, the output may be output in the direction opposite to the original control deviation.

Therefore, Japanese Patent Application No. 2-208484 proposes a control device which combines a so-called expert method and fuzzy control. However, since the contents of the operation rule and the evaluation function are defined separately for each rule, which operation rule is used when applied to a wide variety of paper machines.
There is a problem in that it is difficult to determine whether the optimal rule is optimal.

The present invention has solved such a problem, and can easily determine the optimum operation amount regardless of the type of paper machine using an operation rule prepared in advance for the current control deviation. An object of the present invention is to provide a paper machine control device that can be used.

[0006]

SUMMARY OF THE INVENTION The present invention which achieves such an object is to measure a control deviation pattern corresponding to each operation end of a papermaking process, and use this control deviation pattern in the direction of decreasing the deviation. In addition, the paper machine control device that calculates the current operation amount of the operation end has the following configuration.

That is, a standard deviation pattern and an operation rule storage unit having a plurality of sets of standard output patterns corresponding to the standard deviation pattern, a control deviation pattern and a standard deviation pattern of a papermaking process. -A normalization calculation unit that normalizes at least one of the two with a gain that minimizes the deviation from it, and a degree of conformance that calculates the degree of conformity between this normalized control deviation pattern and standard deviation pattern. The operation unit, the output pattern adjusting unit that multiplies the gain calculated by the normalization operation unit on the standard output pattern corresponding to the standard deviation pattern, and the operation rule unit that stores the values. With respect to the standard deviation pattern, a control deviation pattern for each operating end is given to the normalization operation unit, and the conformity operation unit and the output pattern are used by using the result calculated by the normalization operation unit. -Operation management unit that executes the operation of the adjustment unit , The output pattern obtained by the output pattern adjustment unit is weighted according to the conformity of each standard deviation pattern for each operating end, and the control deviation is determined as the execution control deviation of the operating end. And a section.

[0008]

Each component of the present invention has the following action. The operation rule memory section prepares a typical control deviation pattern and several kinds of standard output patterns for dealing with it. The normalization calculation unit corrects the values of the control deviation pattern and the standard deviation pattern with an optimum gain, and the goodness of fit calculation unit calculates the goodness of fit. The output pattern adjustment unit uses this gain to correct the standard output pattern. The operation management unit uses a normalization operation unit, a fitness operation unit, and an output pattern adjustment unit to perform a series of operations, and each standard deviation pattern stored in the operation rule storage unit.
This is done for each operating end. The control deviation determining unit calculates the execution control deviation of this time by using the calculated conformance and the standard output pattern for each operation end. The operation amount of the operation end is calculated in the direction of reducing the execution control deviation.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. Figure 1
FIG. 3 is a configuration block diagram showing an embodiment of the present invention. In the figure, the input processing unit 10 compares the distribution (profile) in the paper width direction such as the basis weight measured at the detection end with a target value to obtain a control deviation. The position corresponding portion 12 defines the position correspondence between the measurement point in the paper width direction and the operating end. For example, the technique disclosed in Japanese Patent Laid-Open No. Sho 63-92793 may be used, and the position corresponding to the middle of the actual operating end. When providing a virtual half slice, the technique disclosed in Japanese Patent Laid-Open No. 1-282395 is used.

The operation rule storage unit 20 has a standard deviation pattern.
TDVH and a plurality of standard output pattern MPV corresponding to this standard deviation pattern are provided, and a specific example will be described later. The normalization calculation unit 22 normalizes the control deviation pattern DVH 'in the papermaking process with a gain Go that minimizes the deviation from the standard deviation pattern. Here, the control deviation pattern DVH' is Corrected with gain Go and standard deviation pattern TDVH
However, the standard deviation pattern TDVH may be expanded or contracted to conform to the control deviation pattern DVH '. Here, in the sense of the least squares method, the difference between the control deviation pattern DVH 'and the normalized control deviation pattern SDVH is minimized. Fitness calculator 24
Is the normalized control deviation pattern SDVH and the standard deviation pattern TD
The degree of conformity with the pattern with VH is calculated. The details of this calculation will be described later. The output pattern adjusting unit 26 uses the gain Go calculated by the normalization calculating unit 22 as the standard output pattern MPV corresponding to the standard deviation pattern TDVH used for the calculation.
Is multiplied by to obtain the output magnitude corresponding to the control deviation pattern DVH '. The calculation management unit 28 includes the operation rule storage unit 2
For each standard deviation pattern TDVH stored as 0, the control deviation pattern DVH 'for each operating end is given to the normalization calculation unit 22 and the result calculated by this normalization calculation unit 22 is used. The compatibility calculation section 24 and the output pattern adjustment section 26 are operated. The control deviation determination unit 30 performs a weighting calculation on the output pattern obtained by the output pattern adjustment unit 26 according to the conformity of each standard deviation pattern for each operation end, and executes control of the operation end. The deviation is En '. Output processing unit 4
0 inputs the execution control deviation En ′ and outputs the operation amount in the direction of decreasing this value to each operation end.

The details of the apparatus thus configured will be described below. 2A and 2B are explanatory diagrams of the rules of the operation rule storage unit 20, where FIG. 2A is a graph in which the vertical axis is the fitness and the horizontal axis is the control deviation, and FIG. Graph using relative operating end position on axis, (C) is standard output pattern MP on vertical axis
V is a graph using the relative operating end position on the horizontal axis. The five curves in (B) represent the standard deviation pattern TDVH and the goodness-of-fit pattern TDVH1-4. Here, the goodness-of-fit patterns TDVH1 to 4 represent the division points of the goodness-of-fit 0,1,1,0, respectively. The relative operating end position on the horizontal axis is 0 at the center.
At the position where the operating end exists, ± 1 represents the adjacent operating end and ± 0.5 represents the half slice. Therefore, the standard output pattern MPV is effective for the three lines 0 and ± 1. Is defined. If the center 0 is the position where the half slice exists, ± 1 indicates the adjacent half slice, and ± 0.5 indicates the adjacent operating end. Therefore, the standard output pattern MPV is used.
Is effectively defined for two lines of ± 0.5.

FIG. 3 is a three-dimensional representation of FIGS. 2A and 2B, in which two axes in the plane represent the control deviation and the relative operating end position, and the vertical axis represents the degree of conformity. Allotted. Although it is easy to grasp the three-dimensional display, it is necessary to have a detailed structure when designing actual parameters.
The display like this is used to display the operation rule.

FIG. 4 is an explanatory diagram of the normalization calculation unit 22.
(A) shows the control deviation pattern DVH ', (B) shows the standard deviation pattern TDVH, (C) shows the normalized control deviation pattern SDVH, and the horizontal axis is the relative operating end position. .. In general, the control deviation pattern DVH 'and the standard deviation pattern TDVH are different in absolute value, so that the fitness cannot be calculated directly. Therefore, the control deviation pattern DVH 'is divided by the gain Go to have a size commensurate with the standard deviation pattern TDVH, and then sent to the conformance calculating section 24. Where gain Go
Is the corrected standard deviation pattern TDVH and the control deviation pattern.
Since it is determined that the difference between the DVH 'and the DVH' is the minimum in the meaning of the least squares method, it also represents the absolute magnitude of the control deviation. The gain Go is given by the following equation.

[Equation 2] Here, the subscript r of the standard deviation pattern TDVH represents the number of the rule stored in the operation rule storage unit 20, and specifies any of the rules 1 to 16 described later, for example. The subscript i of the control deviation pattern DVH 'represents the number of the operating end. Some paper machines have about 40 operating ends, and when the half slice is included, 1/2 is added to the natural number. It becomes a value. The subscript j is the five operation ends / har which are used to calculate the fitness.
It represents a fuslice, and the central operating end is defined by the subscript i. The normalized control deviation pattern SDVH is defined by the following equation.

[Equation 3] It takes less time to calculate the goodness of fit by dividing the control deviation pattern DVH 'by the gain Go and calculating the degree of conformity than when calculating the standard deviation pattern TDVH by the gain Go. Has the property of being completed.

FIG. 5 is an explanatory diagram of the calculation contents of the conformance calculating section 24. The conformity is calculated from the normalized control deviation pattern SDVH and the standard deviation pattern TDVH. First, the fitness fp for each operating end position is calculated by the following equation.

[Equation 4] Next, an operation corresponding to the logical product of the fuzzy operations is performed by the following equation to obtain the fitness fr of the rule.

[Equation 5]

Next, the control deviation determining section 30 will be described. The execution control deviation En ′ is calculated based on the goodness of fit fr calculated by the goodness of fit calculator 24. In order to make the calculation smooth, the numerator fou for output calculation and the denominator fol for output calculation are calculated by the following formulas for the operating end i at the operating end position.

[Equation 6] Here, MVP = "No" means that the standard output pattern MPV is not reflected in the determination of the execution control deviation En '. As a result, the output is determined by other rules. Setting MVP = 0.0 affects the output calculation, and if the weighted average calculation is performed on the output with a low conformity with MVP not 0.0 and the output with a high conformance with MVP 0.0, the output value close to 0.0. Is output.

The output calculation numerator fou and the output calculation denominator fo1 are calculated by the following equations for the operating end i at the half slice position.

[Equation 7] Then, according to the following formula, each control deviation pattern DVH '
The output calculated by the above equation is weighted averaged for each operation end position by the following equation to obtain the execution control deviation En '.

[Equation 8]

FIG. 6 is a flow chart illustrating the operation of the apparatus of FIG. When the current control cycle is started, the calculation management unit 2
The number of the operating end i is initialized by 8 (S10), and it is determined whether the calculation of all operating ends is completed (S12). The arithmetic management unit 28 also initializes the rule number j (S14), and completes all rules.
It is determined whether the calculation of the rule has been completed (S16).

In the normal calculation process, the operation rule storage unit 2
The rule j is read from 0, and the normalization calculation unit 22 calculates the gain Go of the rule j with respect to the operation end position i (S18).
Then, the goodness-of-fit calculation unit 24 compares the (standard deviation pattern TDVH * gain Go) with the control deviation pattern DVH 'to calculate the goodness of fit (S20). Further, the output pattern adjusting unit 26 calculates the output of the rule j by (standard output pattern MPV * gain Go) (S22). Then, the calculation management unit 28 updates the rule number (S24), and if the calculation for all rules is completed (S16), updates the operation end number (S2).
6).

When the calculation for all the operating ends is completed (S1
2) The calculation by the control deviation determination unit 30 is started. First, the operation end number is initialized (S30), and the execution control deviation becomes the output value by the gravity center calculation from the output from each rule and the goodness of fit.
En 'is calculated (S32). Then, the operation end number is updated (S34), and when the operation of all the operation ends is completed (S30), the operation in the current profit control cycle is completed and the operation amount is output to the operation end via the output processing unit 40. To be done.

FIG. 7 is a block diagram of the entire paper machine controller. In the input processing unit 10, the measured values measured in the paper width direction are normally averaged in a section corresponding to the operation end, and if necessary, smoothing calculation is performed between the measured values and past measured values.

The control processing unit 50 calculates the deviation between the measured value PVi and the target value SVi to calculate the control deviation DVi,
Next, the control deviation DVi is corrected by the nonlinear gain corresponding to the nonlinearity of the papermaking process. Pattern recognition is performed on the corrected control deviation En'i, and the operation rule storage unit, the normalization calculation unit, the fitness calculation unit, the output pattern adjustment unit, the calculation management unit, and the control deviation shown in FIG. The execution control deviation En ′ is obtained by a series of calculations performed by the determining unit. And P
The I operation unit determines the deviation operation amount Δyi at this time.

In the output processing section 60, the grammage at the paper edge is reduced as compared with the value at the center to facilitate winding on the reel, and the time constant and the life of the response at the operating edge are corrected. Considering the above, the deviation manipulated variable Δyi is limited between the upper limit value and the lower limit value. Also, it is empirically known that if the operation amount greatly deviates from the adjacent operation end, it is not preferable for the operation of the paper machine. The average value of is optimized considering the responsiveness of the process. Since the manipulated variable yi is mechanically limited, the manipulated variable yi is limited by a limiter so that the manipulated variable yi is corrected so as not to cause an unreasonable operation with respect to the operating end and the papermaking process, and converted into an output signal.

Finally, the contents of the operation rule storage unit 20 will be described. Since there are 16 rules here, they will be described with reference to the drawings. FIG. 8 is an explanatory diagram of the rule 1. As in FIG. 2, (A) is a graph in which the vertical axis is the goodness of fit and the horizontal axis is the control deviation, and (B) is the vertical axis, the control deviation and the horizontal axis are relative. (C) shows the standard output pattern MPV on the vertical axis and the relative operation end position on the horizontal axis. Rule 1 represents a case where only the central operation end is operated and the adjacent operation end is not operated.

FIG. 9 is an explanatory diagram of the rule 2. Rule 2
Is applied when the center is a half slice, and outputs in the same direction are produced at two adjacent operating ends. FIG. 10 is an explanatory diagram of the rule 3. The rule 3 outputs in the same direction to the operation end in the center and the adjacent operation end on the right side, and suspends the output for the operation end adjacent to the left side. Figure 4 is rule 4
FIG. The rule 4 outputs in the same direction to the central operating end and the adjacent operating end on the left side, and suspends the output for the operating end adjacent to the right side.

FIG. 12 is an explanatory diagram of the rule 5. The rule 5 outputs the same amount to the left and right operation ends adjacent to the central operation end. FIG. 13 is an explanatory diagram of the rule 6. Rule 6
Outputs the same amount to the left and right operation ends adjacent to the central operation end, but the absolute value of the output is smaller than that of rule 5. FIG. 14 is an explanatory diagram of the rule 7. The rule 7 is a case where a half slice exists in the center, and the same amount of output is performed at the adjacent left and right operation ends. 15 to 20
Shows the rules 8 to 13, respectively, and all of them are forgotten the output of the operating end.
In general, in areas where the profile is greatly disturbed, wait for the operation to wait until the profile becomes more stable,
It is empirically known that this is preferable for control.
FIG. 21 is an explanatory diagram of the rule 14. The rule 14 outputs to the left and right operation ends adjacent to the center operation end in the same direction, but the output amount is large in the center. Figure 22 shows
FIG. The rule 15 is a case where a half slice exists in the center, and outputs the same amount to the adjacent left and right operation ends. FIG. 23 is an explanatory diagram of the rule 16. The rule 16 gives a small output to the central operation end,
The output is abandoned for the adjacent left and right operation ends.

In the above embodiment, five operation ends including half slices are used for calculating the rules of the operation rule storage unit and the fitness, but the present invention is not limited to this. However, the density of virtual operating ends may be increased as compared with the half slice, and the number of operating ends used for calculation may be increased or decreased.

[0027]

As described above, the present invention has the following effects. Since a typical pattern is prepared in the operation rule storage unit, fine control can be performed according to the control deviation pattern DVH '. Since the standard deviation pattern TDVH and the control deviation pattern DVH 'are compared via the normalization calculation unit, it is not necessary to provide a rule for each control deviation size, and a wide variety of paper machines can be used. Can be dealt with universally. Since the output pattern adjusting unit multiplies the standard output pattern MPV by the gain Go, it is possible to perform an output corresponding to the magnitude of the control deviation. The control deviation determination unit combines the output results for multiple rules into one, so a more rational execution control deviation
En´ is defined. Conventionally, the control deviation pattern DVH 'was sometimes averaged in the time direction to perform the control calculation, but in the present invention, it is not necessary to perform the time averaging, so it is used for the control calculation without rising the control deviation. It is possible to improve the responsiveness.

[Brief description of drawings]

FIG. 1 is a configuration block diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram of rules of an operation rule storage unit 20.

FIG. 3 is a graph showing (A) and (B) of FIG. 2 in a three-dimensional manner.

FIG. 4 is an explanatory diagram of a normalization calculation unit 22.

FIG. 5 is an explanatory diagram of calculation contents of a conformance calculation unit 24.

6 is a flow chart illustrating the operation of the apparatus of FIG.

FIG. 7 is a configuration diagram of the entire paper machine control device.

FIG. 8 is an explanatory diagram of a rule 1.

FIG. 9 is an explanatory diagram of a rule 2.

FIG. 10 is an explanatory diagram of a rule 3.

FIG. 11 is an explanatory diagram of a rule 4.

FIG. 12 is an explanatory diagram of a rule 5.

FIG. 13 is an explanatory diagram of a rule 6.

FIG. 14 is an explanatory diagram of a rule 7.

FIG. 15 is an explanatory diagram of a rule 8.

FIG. 16 is an explanatory diagram of a rule 9.

FIG. 17 is an explanatory diagram of a rule 10.

FIG. 18 is an explanatory diagram of a rule 11.

FIG. 19 is an explanatory diagram of a rule 12.

FIG. 20 is an explanatory diagram of a rule 13.

FIG. 21 is an explanatory diagram of the rule 14.

22 is an explanatory diagram of the rule 15. FIG.

FIG. 23 is an explanatory diagram of a rule 16.

[Explanation of symbols]

 10 ... Input processing unit 20 ... Operation rule storage unit 22 ... Normalization calculation unit 24 ... Fitness calculation unit 26 ... Output pattern adjustment unit 28 ... Calculation management unit 30 ... Control deviation determination unit 40 ... Output processing unit DVH ´… Control deviation pattern En´… Execution control deviation Go… Gain MPV… Standard output pattern SDVH… Normalized control deviation pattern TDVH… Standard deviation pattern

Claims (1)

[Claims] 1. A paper machine control for inputting a control deviation pattern corresponding to each operation end of a papermaking process, and calculating a current operation amount of the operation end in the direction of decreasing the control deviation pattern. The machine has a standard deviation pattern and an operation rule storage section that has multiple sets of standard output patterns corresponding to this standard deviation pattern, a control deviation pattern and a standard deviation pattern for the papermaking process. The normalization calculation unit that normalizes at least one of the two with a gain that minimizes the deviation from the standard deviation, and the goodness of fit that calculates the goodness of fit between the normalized control deviation pattern and the standard deviation pattern. The calculation part and the output pattern that multiplies the standard output pattern corresponding to the gain and the standard deviation pattern calculated by the normalization calculation part
For the standard deviation patterns stored in the operation adjusting section and the operation rule section, a control deviation pattern for each operating end is given to the normalizing operation section, and this normalizing operation section An operation management section for executing the calculations of the fitness calculation section and the output pattern adjustment section using the calculated results, and an output pattern obtained by the output pattern adjustment section are output for each operation end. A paper machine controller, comprising: a control deviation determination unit that performs a weighting calculation according to the conformity of each standard deviation pattern to obtain an execution control deviation of the operating end.