CN113111092B - Silicon steel iron loss prediction method based on cold rolling full-process data - Google Patents
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Abstract
The invention relates to a cold-rolled full-process data-based silicon steel iron loss prediction method, which is used for performing full-process material tracking on cold-rolled silicon steel, classifying the cold-rolled silicon steel based on a clustering algorithm, selecting a representative process as a training set of a neural network to predict the iron loss of the cold-rolled silicon steel, and exploring the influence of the processes of each cold-rolling unit on the iron loss of the cold-rolled silicon steel.
Description
Technical Field
The invention relates to the technical field of cold-rolled silicon steel, in particular to a silicon steel iron loss prediction method based on cold-rolled full-process data.
Background
The iron loss is the most important quality parameter of the cold-rolled silicon steel, and directly determines the service performance of the cold-rolled silicon steel. The current literature mainly considers that the influence of steelmaking components and temperature, and hot rolling heating and cooling system on the iron loss of silicon steel is large, for example, the analysis and control method of the cause of poor iron loss of 50W1300 in new steel finds that the cause of poor iron loss of 50W1300 is mainly related to higher heating temperature of a hot rolling heating furnace, lower temperature of a contact part between a plate blank and a water beam of the heating furnace, uneven heating temperature of the heating furnace and the like through analysis. Also, for example, the influence of steelmaking process and component system on the iron loss of B50A1300 silicon steel discusses the RH oxygen blowing amount of refining, w [ Mn ]]2/w[Si]The ratio, the FeAl pre-deoxidation effect, the continuous casting molten steel calming time and the like on the iron loss of the B50A1300 silicon steel.
However, in actual production, each process of cold-rolled silicon steel production, including a normalizing pickling line, a rolling mill, a continuous annealing coating line and the like, has a great influence on the iron loss of the cold-rolled silicon steel, but at present, no mechanism model of the process of each cold-rolled line and the iron loss of the cold-rolled silicon steel is established, and even no relevant quantitative analysis data model is found.
Disclosure of Invention
The invention aims to provide a silicon steel iron loss prediction method based on cold rolling full-process data so as to find out the influence of cold rolling of each unit process on the iron loss of cold-rolled silicon steel.
The specific scheme is as follows:
a silicon steel iron loss prediction method based on cold rolling full-process data comprises the following steps:
s1, performing full-flow material tracking on cold-rolled silicon steel, wherein the full-flow material tracking at least comprises process data of a normalized pickling unit, a rolling mill and a continuous annealing coating unit, completing process data acquisition of each unit experienced by a steel coil and online iron loss data acquisition of the silicon steel, and obtaining length positions of each unit corresponding to each position of raw materials, process parameters and final iron loss values of the position through length mapping among the units, and each raw material position of each coil steel obtains a group of data d which comprises input data di (process data) and output data do (iron loss data);
s2, acquiring all group data D of each raw material roll to form a data set D; wherein the data set D comprises an input data set Di and an output data set Do;
performing clustering analysis on Di by using a DBSCAN clustering method to obtain N1 clusters;
performing cluster analysis on Do by using a DBSCAN clustering method to obtain N2 clusters;
s3, in step S2, the Di and Do clusters are completely and independently operated, and N1 × N2 is obtained as M cluster combinations, that is, each data D belongs to one of the M cluster combinations, and the current cnt group data is selected from the M clusters to form a new data set D; if the number of the data d included in the cluster is less than cnt, selecting all the data d;
s4, carrying out BP neural network training on the training data set, wherein input data of the BP neural network is an input data set Di, and output data of the BP neural network is an output data set Do; the BP neural network adopts a three-layer network, the number of neurons in a first layer is the number E of process data, the number of neurons in a hidden layer is E/2.5 and is an integer, and the number of neurons in an output layer is 1, wherein the number of neurons in the first layer is more than 6 and less than 15;
and S5, performing iron loss prediction on the new silicon steel coil by using the established neural network.
Further, the data selecting process in step S3 is as follows:
s31, calculating the Euclidean distance of each group of data relative to a zero point;
s32, arranging according to the ascending order of the distances;
and S33, and then selecting according to the distance at equal intervals.
Compared with the prior art, the silicon steel iron loss prediction method based on cold rolling full-process data provided by the invention has the following advantages:
1. an influence model of the iron loss of the cold-rolled silicon steel is established to find out the influence of the processes of each cold-rolling unit on the iron loss of the cold-rolled silicon steel.
2. The cold-rolled silicon steel iron loss is predicted based on cold-rolled full-process data, and the quality of the cold-rolled silicon steel can be effectively improved.
3. The influence of the processes of each cold rolling unit on the iron loss of the cold-rolled silicon steel is established by adopting a neural network, and the technical bottleneck of the mechanism model research process is overcome.
4. Based on clustering algorithm classification, and selecting a representative process as a training set of the neural network, the negative influence of the quality of a training sample on the training effect of the neural network is solved.
Drawings
Fig. 1 shows a flowchart of a silicon steel iron loss prediction method.
FIG. 2 is a diagram illustrating the data of the full-run material tracking process performed on cold-rolled silicon steel in one embodiment.
Detailed Description
To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
The invention will now be further described with reference to the accompanying drawings and detailed description.
As shown in fig. 1, the present embodiment provides a method for predicting iron loss of silicon steel based on cold rolling full-process data, which includes the following steps:
s1: cold rolling full process material tracking
The method comprises the steps of carrying out full-flow material tracking on cold-rolled silicon steel, at least comprising process data of a normalizing pickling unit, a rolling mill and a continuous annealing coating unit, completing process data acquisition of each unit experienced by a steel coil, online iron loss data acquisition of the silicon steel, and obtaining length positions of each unit corresponding to each position of raw materials, process parameters and a final iron loss value of the position through length mapping between the units, so that each raw material position of each coil of steel can obtain a group of data d, and each raw material position of each coil of steel comprises input data di (process data) and output data do (iron loss data). Specific data for one embodiment is shown in fig. 2.
S2: DBSCAN cluster analysis
For each roll of stock, all their sets of data D are acquired, constituting a data set D. Where data set D includes an input data set Di (process data set) and an output data set Do (core loss data set).
And (5) carrying out cluster analysis on the Di by using a DBSCAN clustering method to obtain N1 clusters.
And (4) performing cluster analysis on the Do by using a DBSCAN clustering method to obtain N2 clusters.
DBSCAN (sensitivity-Based Spatial Clustering of Applications with Noise) is a relatively representative Density-Based Clustering algorithm. Given a set of points in a space, the algorithm can group nearby points (points with many neighboring points) and mark the outlying points (points closest to it are also quite far away) that are located in low density areas.
DBSCAN requires two parameters: epsilon (eps) and the minimum number of points needed to form a high density region (minPts), starting with an arbitrary unvisited point, then explore the epsilon-neighborhood of this point, and if there are enough points in the epsilon-neighborhood, create a new cluster, otherwise this point is labeled as a murmurmur. This point may then be found in the epsilon neighborhood of other points, which may have enough points to add to the cluster.
The DBSCAN has the following advantages compared with the K-means algorithm:
(1) DBSCAN does not require a pre-declared cluster number. Moreover, the DBSCAN can find any shape of cluster, even one cluster, which surrounds but is not connected to another cluster, and in addition, due to the minPts parameter, single-link effect (different clusters are connected by a point or a very young line and are regarded as one cluster) can be effectively avoided.
(2) DBSCAN can distinguish noise (local point).
(3) DBSCAN requires only two parameters and is almost insensitive to the order of the points within the database (the points of the edge between two clusters have a chance to be sorted into different clusters affected by the order, and the order of the other clusters will be affected by the order of the points).
(4) DBSCAN can be designed as a database structure that can be accessed in conjunction with acceleration ranges.
(5) Appropriate parameters may also be selected to obtain the best classification. If a point is in a dense region of a cluster, the points in its epsilon-neighborhood also belong to the cluster, and when these new points are added to the cluster, the points in its epsilon-neighborhood will also be added to the cluster if it(s) are also in the dense region. This process is repeated until no more points can be added, such that a densely connected cluster is completely found, and then an unaccessed point is explored to find a new cluster or noise.
The DBSCAN has the advantages that the DBSCAN can achieve a better effect in the silicon steel iron loss prediction process based on cold rolling full-flow data.
S3: training sample selection
The above two clustering runs are completely independent. This results in N1 × N2 being M cluster combinations, i.e., each data d belongs to one of the M cluster combinations. And (4) selecting the existing cnt group data in the M kinds of clusters to form a new data set D. And if the number of the data d included in the cluster is less than the cnt, selecting all the data d.
The data selection process is as follows:
s31: and calculating the Euclidean distance of each group of data relative to the zero point.
S32: arranged in ascending order of distance.
S33: and then picked at equal intervals according to the distance.
The main reason for selecting the training samples is that the iron loss produced by the same process parameters fluctuates, if the data are put into a neural network training set, the training results have larger deviation, and therefore, after clustering is adopted, the representative samples are selected, so that the problem can be solved.
S4: BP neural network based training
And carrying out BP neural network training on the training data set. Obviously, the input data of the BP neural network is an input data set Di, and the output data is an output data set Do. The BP neural network adopts a three-layer network, the number of neurons in the first layer is the number E of process data, the number of neurons in the hidden layer is E/2.5, and integers are taken to ensure that the number is more than 6 and less than 15. The number of neurons in the output layer is 1.
S5: silicon steel iron loss prediction
The iron loss prediction can be carried out on the new silicon steel coil by using the established neural network. The process parameters can be reversely controlled based on the neural network, so that the iron loss is lower or the iron loss consistency in the full-length direction of the strip steel is better.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (2)
1. A silicon steel iron loss prediction method based on cold rolling full-process data is characterized by comprising the following steps:
s1, performing full-process material tracking on cold-rolled silicon steel, wherein the full-process material tracking at least comprises process data of a normalizing pickling unit, a rolling mill and a continuous annealing coating unit, completing process data acquisition of units experienced by steel coils and on-line iron loss data acquisition of the silicon steel, and obtaining length positions of the units corresponding to the positions of raw materials, process parameters and final iron loss values at the positions through length mapping among the units, wherein each raw material position of each coil steel obtains a group of data d which comprises input data di and output data do, do and iron loss data;
s2, acquiring all group data D of each raw material roll to form a data set D; wherein the data set D comprises an input data set Di and an output data set Do;
performing clustering analysis on Di by using a DBSCAN clustering method to obtain N1 clusters;
performing cluster analysis on Do by using a DBSCAN clustering method to obtain N2 clusters;
s3, in step S2, the Di and Do clusters are completely and independently operated, and N1 × N2 is obtained as M cluster combinations, that is, each data D belongs to one of the M cluster combinations, and the current cnt group data is selected from the M clusters to form a new data set D; if the number of the data d included in the cluster is less than cnt, selecting all the data d;
s4, carrying out BP neural network training on the training data set, wherein input data of the BP neural network is an input data set Di, and output data of the BP neural network is an output data set Do; the BP neural network adopts a three-layer network, the number of neurons in a first layer is the number E of process data, the number of neurons in a hidden layer is E/2.5 and is an integer, and the number of neurons in an output layer is 1, wherein the number of neurons in the first layer is more than 6 and less than 15;
and S5, performing iron loss prediction on the new silicon steel coil by using the established neural network.
2. The silicon steel iron loss prediction method of claim 1, wherein the data selection process in step S3 is as follows:
s31, calculating the Euclidean distance of each group of data relative to a zero point;
s32, arranging according to the ascending order of the distances;
and S33, and then selecting according to the distance at equal intervals.
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