Comprehensive evaluation system for electromagnetic field control effect of underwater target

Abstract

The invention relates to a comprehensive evaluation system for an electromagnetic field control effect of a target in water. The system is characterized by comprising an electromagnetic field characteristic data storage module, an electromagnetic field characteristic data classification module, an electromagnetic field control evaluation index subjective evaluation weighting module, an electromagnetic field control evaluation index objective evaluation weighting module and an electromagnetic field control evaluation index subjective and objective evaluation integrated weighting module. An evaluation index correlation degree calculation module; and an evaluation result output module. The electromagnetic field control effect comprehensive evaluation method adopting the electromagnetic field control effect comprehensive evaluation system is visual, simple and rapid, the evaluation process adopting a specific algorithm not only reflects subjectivity, but also reflects the internal objective relation of electromagnetic field control indexes, and the result is objective and comprehensive.

Description

Technical Field

[0001] The present invention relates to the technical field of underwater target control, and in particular to a comprehensive evaluation system for the electromagnetic field control effect of an underwater target. Background Art

[0002] Due to the use of magnetic materials, corrosion and anti-corrosion effects, underwater targets will excite magnetic and electric fields in the surrounding seawater and air. Magnetic and electric field signals have become an important signal source that threatens the safety of underwater targets. In view of the characteristics of the magnetic field, fixed demagnetization and boat-borne demagnetization devices have been used to control the fixed magnetic field and the induced magnetic field respectively; in view of the characteristics of the electric field, cathodic protection system optimization technology and active shaft grounding devices have been used to control the electrostatic field and shaft frequency electric field respectively.

[0003] Based on the assessment needs and effect evaluation of the control effects of different magnetic field sources and electric field sources, it is necessary to establish an index system and evaluation system that can reflect the characteristics of magnetic field targets and electric field targets. However, at present, there are only single evaluation indicators for the magnetic field or electric field characteristics of underwater targets. For example, for the static magnetic field of materials of underwater targets, only the maximum value of the magnetic field at the standard depth is evaluated, and there are no evaluation indicators such as gradient value and rate of change; for the corrosion and anti-corrosion electromagnetic field of underwater targets, only the electric field at the standard depth is evaluated, and there is no coupled magnetic field evaluation indicator. Considering the multiplicity of threats faced by magnetic field and electric field characteristics, as well as the coupling between magnetic field and electric field, it is necessary to establish an evaluation system that comprehensively reflects the comprehensive control effect of electromagnetic field. Summary of the invention

[0004] The present invention provides a comprehensive evaluation system for electromagnetic field control effect of underwater targets, the comprehensive evaluation system for electromagnetic field control effect of underwater targets includes an electromagnetic field control evaluation index subjective evaluation weighting module, an electromagnetic field control evaluation index objective evaluation weighting module, an electromagnetic field control evaluation index subjective and objective evaluation integrated weighting module and an evaluation index correlation calculation module;

[0005] The electromagnetic field evaluation index subjective evaluation weighting module determines the subjective weighting value and ranking of the evaluation index according to the experience and subjectivity of the experts;

[0006] The magnetic field evaluation index objective evaluation weighting module determines the objective weighting value and ranking of the evaluation index according to the intrinsic relationship between the electromagnetic field evaluation index parameters;

[0007] The electromagnetic field evaluation index subjective and objective evaluation integrated weighting module performs integrated weighting according to the subjective weighting value and the objective weighting value to determine the optimal weight and ranking of the evaluation index;

[0008] The evaluation index correlation calculation module calculates the grey correlation of the evaluation index according to the optimal weight to determine the pros and cons of the scheme.

[0009] Furthermore, the steps of integrating the subjective weighting value and the objective weighting value are as follows:

[0010] Determine the subjective weight set W of each indicator based on the subjective and objective evaluation weighting method s and the objective weight set W b ;

[0011] For each evaluation index, the weight w is calculated based on the moment estimation theory. sj and w bj Expected value;

[0012] Determine the important coefficients α and β of the subjective and objective weights of each indicator based on the moment estimation theory;

[0013] Based on the principle of minimizing the deviation between the optimal combination weight and the subjective and objective weight, the optimal combination weight w is established. j Solve the model using particle swarm optimization algorithm.

[0014] Furthermore, the subjective weight set W of each indicator s and the objective weight set W b for:

[0015]

[0016] Among them, l is the number of subjective evaluation weighting methods, q is the sum of the number of subjective evaluation weighting methods and objective evaluation weighting methods, m is the number of evaluation indicators, and w is the number of subjective evaluation weighting methods. sj is the subjective weight vector, w bj is the objective weight vector, s is the subjective weight number, and b is the objective weight number.

[0017] Furthermore, the weight w sj and w bj The expected value of is:

[0018]

[0019] Where E(w sj ) is the weight w sj The expected value of E(w bj ) is w bj expected value.

[0020] Furthermore, the important coefficients α and β of the subjective and objective weights are:

[0021]

[0022] α j is a subjective judgment index, β j It is an objective judgment indicator.

[0023] Furthermore, the objective function of the particle swarm optimization algorithm is:

[0024]

[0025] H is the weight optimization target, w j represents the optimal combination weight.

[0026] Furthermore, the steps of integrating the subjective weighting value and the objective weighting value are as follows:

[0027] The dimensionless decision matrix R is determined based on the set of solutions determined by the comprehensive evaluation method and the optimal value set of each evaluation indicator:

[0028]

[0029] Where: r ij is the jth evaluation index d of scheme i ij (1≤i≤n, 1≤j≤m) attribute value after dimensionless processing; is the reference value of the evaluation index, taking the minimum value of the index in each scheme;

[0030] Determine the grey correlation coefficient of the jth evaluation index of the i-th scheme

[0031]

[0032] Where: ρ is the resolution coefficient; is the absolute minimum; is the absolute maximum value;

[0033] Determine the grey correlation degree P of the decision-making scheme i :

[0034]

[0035] The evaluation result output module is used to output the evaluation result of the quality of the evaluation, the grey correlation degree P i The larger the value, the closer it is to the optimal evaluation index.

[0036] Furthermore, the underwater target electromagnetic field control effect comprehensive evaluation system also includes an electromagnetic field characteristic data storage module, which is used to store various electromagnetic field characteristic original data of the underwater target measured at a measurement station or the like.

[0037] Furthermore, the comprehensive evaluation system for the control effect of the underwater target electromagnetic field also includes an electromagnetic field characteristic data classification module, which is used to perform time-frequency analysis on the original electromagnetic field characteristic data, and classify the original data according to the established underwater target electromagnetic field control index system to obtain evaluation index parameters of the control effects of different electromagnetic field sources.

[0038] The beneficial effects of the present invention are:

[0039] The comprehensive evaluation system for the electromagnetic field control effect of underwater targets proposed by the present invention can effectively guide the design of magnetic field control and electric field control of underwater targets, as well as the evaluation of the control effect of magnetic field and electric field characteristics of underwater targets;

[0040] The comprehensive evaluation system for the electromagnetic field control effect of underwater targets proposed by the present invention combines the advantages of subjective evaluation weighting method and objective evaluation weighting method, and can realize objective and comprehensive evaluation of electromagnetic field comprehensive control schemes in a simple, fast and intuitive manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The advantages of the above and additional aspects of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0042] Figure 1 It is composed of the comprehensive evaluation system of the underwater target electromagnetic field control effect of the present invention.

[0043] Figure 2 The invention discloses the sources and classifications of electromagnetic fields generated by underwater targets. DETAILED DESCRIPTION

[0044] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0045] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0046] As attached Figure 1 As shown, the present invention provides a comprehensive evaluation system for the electromagnetic field control effect of underwater targets, including an electromagnetic field characteristic data storage module, an electromagnetic field characteristic data classification module, an electromagnetic field control evaluation index subjective evaluation weighting module, an electromagnetic field control evaluation index objective evaluation weighting module, an electromagnetic field control evaluation index subjective and objective evaluation integrated weighting module, an evaluation index correlation calculation module and an evaluation result output module.

[0047] The electromagnetic field characteristic data storage module is used to store various electromagnetic field characteristic raw data of underwater targets measured at measurement stations and other places.

[0048] The electromagnetic field characteristic data classification module is used to perform time-frequency analysis on the original electromagnetic field characteristic data, and classify the original data according to the established underwater target electromagnetic field control index system to obtain evaluation index parameters for the control effects of different electromagnetic field sources.

[0049] The electromagnetic field control index system of underwater targets is as follows: Figure 2 As shown in Table 1, the electromagnetic field sources are divided into three types of magnetic sources and eight types of electrical sources according to the different generation mechanisms. The magnetic sources include fixed magnetic fields, induced magnetic fields, and induced electromagnetic fields generated by the movement of magnetic hulls. The electrical sources include corrosion electromagnetic fields, anti-corrosion electromagnetic fields, leakage current electromagnetic fields, stray electromagnetic fields, metal hull movement induced electromagnetic fields, rotating rotor induced electromagnetic fields, wake electromagnetic fields, friction electromagnetic fields, etc. According to the different frequency characteristics, the evaluation system proposes evaluation indicators such as peak value, mean square value, gradient peak value, and change rate peak value for DC components, and peak-to-peak value, change rate peak value, and frequency doubling percentage for AC components.

[0050] Table 1 Evaluation indexes for comprehensive control of electromagnetic fields of underwater targets

[0051]

[0052] The subjective evaluation weighting module of electromagnetic field evaluation indicators determines the subjective weighting value and ranking of evaluation indicators according to the experience and subjectivity of experts. The subjective evaluation weighting method adopts hierarchical analysis method or expert scoring method.

[0053] The objective evaluation weighting module of the magnetic field evaluation index determines the objective weighting value and ranking of the evaluation index according to the intrinsic connection between the electromagnetic field evaluation index parameters. The objective evaluation weighting method adopts nonlinear principal component analysis or entropy weight method.

[0054] The integrated weighting module of the subjective and objective evaluation of electromagnetic field evaluation indicators performs integrated weighting according to the subjective weighting value and the objective weighting value to determine the optimal weight and ranking of the evaluation indicators in the following steps:

[0055] 1) Determine the subjective weight set W of each indicator based on the subjective and objective evaluation weighting method s and the objective weight set W b :

[0056]

[0057] Where: W s is the subjective weight set, W brepresents the objective weight set, l is the number of subjective evaluation weighting methods, q is the sum of the number of subjective evaluation weighting methods and objective evaluation weighting methods, m is the number of evaluation indicators, j is the serial number of the evaluation indicator, and w sj represents the subjective weight vector, w bj represents the objective weight vector.

[0058] 2) For each evaluation indicator d j (1≤j≤m), the weight w is obtained based on the moment estimation theory sj and w bj The expected value of is:

[0059]

[0060] Where E(w sj ) is the weight w sj The expected value of E(w bj ) is w bj expected value.

[0061] 3) Based on the moment estimation theory, the important coefficients α and β of the subjective and objective weights of each indicator are determined as follows:

[0062]

[0063]

[0064] 4) Based on the principle of minimizing the deviation between the optimal combination weight and the subjective and objective weight, establish the optimal combination weight w j To solve the model, we use the particle swarm optimization algorithm, and the objective function is:

[0065]

[0066] The evaluation index correlation calculation module is based on the optimal weight w j The grey correlation degree P of the evaluation index i Calculate to determine the pros and cons of the plan. The specific steps are as follows:

[0067] 1) Determine the dimensionless decision matrix R based on the set of solutions determined by the comprehensive evaluation method and the optimal value set of each evaluation indicator:

[0068]

[0069] Where: r ij is the jth evaluation index d of scheme i ij (1≤i≤n, 1≤j≤m) attribute value after dimensionless processing; is the reference value of the evaluation index, taking the minimum value of the index in each scheme.

[0070] 2) Determine the grey correlation coefficient of the jth evaluation index of the i-th scheme

[0071]

[0072] Where: ρ is the resolution coefficient; is the absolute minimum; is the absolute maximum value.

[0073] 3) Determine the grey correlation degree P of the decision-making scheme i :

[0074]

[0075] The evaluation result output module is used to output the evaluation result of the quality of the evaluation, the grey correlation degree P i The larger the value, the closer it is to the optimal evaluation index.

[0076] The above specific data calculations can all be performed using MATLAB.

[0077] The present invention is not limited to the above-mentioned specific implementation modes. A person skilled in the art may implement the present invention in various other specific implementation modes according to the embodiments and the disclosure of the drawings. Therefore, any design that adopts the design structure and concept of the present invention and makes some simple transformations or changes shall fall within the scope of protection of the present invention.

Claims

1. A comprehensive evaluation system for the electromagnetic field control effect of an underwater target, characterized in that: The comprehensive evaluation system for the electromagnetic field control effect of underwater targets includes an electromagnetic field control evaluation index subjective evaluation weighting module, an electromagnetic field control evaluation index objective evaluation weighting module, an electromagnetic field control evaluation index subjective and objective evaluation integrated weighting module and an evaluation index correlation calculation module; The electromagnetic field evaluation index subjective evaluation weighting module determines the subjective weighting value and ranking of the evaluation index according to the experience and subjectivity of the experts; The magnetic field evaluation index objective evaluation weighting module determines the objective weighting value and ranking of the evaluation index according to the intrinsic relationship between the electromagnetic field evaluation index parameters; The electromagnetic field evaluation index subjective and objective evaluation integrated weighting module performs integrated weighting according to the subjective weighting value and the objective weighting value to determine the optimal weight and ranking of the evaluation index; The evaluation index correlation calculation module calculates the grey correlation of the evaluation index according to the optimal weight to determine the pros and cons of the scheme.

2. The comprehensive evaluation system for the control effect of an underwater target electromagnetic field according to claim 1 is characterized in that: The steps of integrating the subjective weighting value and the objective weighting value are as follows: Determine the subjective weight set W of each indicator based on the subjective and objective evaluation weighting method s and the objective weight set W b ; For each evaluation index, the weight w is calculated based on the moment estimation theory. sj and w bj Expected value; Determine the important coefficients α and β of the subjective and objective weights of each indicator based on the moment estimation theory; Based on the principle of minimizing the deviation between the optimal combination weight and the subjective and objective weight, the optimal combination weight w is established. j Solve the model using particle swarm optimization algorithm.

3. The comprehensive evaluation system for the control effect of an underwater target electromagnetic field according to claim 2 is characterized in that: The subjective weight set W of each indicator s and the objective weight set W b for: Among them, l is the number of subjective evaluation weighting methods, q is the sum of the number of subjective evaluation weighting methods and objective evaluation weighting methods, m is the number of evaluation indicators, and w is the number of subjective evaluation weighting methods. sj is the subjective weight vector, w bj is the objective weight vector, s is the subjective weight number, and b is the objective weight number.

4. The comprehensive evaluation system for the control effect of an underwater target electromagnetic field according to claim 3 is characterized in that: Weight w sj and w bj The expected value of is: Where E(w sj ) is the weight w sj The expected value of E(w bj ) is w bj expected value.

5. The comprehensive evaluation system for the control effect of underwater target electromagnetic fields according to claim 4 is characterized in that: The important coefficients α and β of subjective and objective weights are: α j is a subjective judgment index, β j It is an objective judgment indicator.

6. The comprehensive evaluation system for the control effect of an underwater target electromagnetic field according to claim 5 is characterized in that: The objective function of the particle swarm optimization algorithm is: H is the weight optimization target, w j represents the optimal combination weight.

7. The comprehensive evaluation system for the control effect of an underwater target electromagnetic field according to claim 1 is characterized in that: The steps of integrating the subjective weighting value and the objective weighting value are as follows: The dimensionless decision matrix R is determined based on the set of solutions determined by the comprehensive evaluation method and the optimal value set of each evaluation indicator: Where: r ij is the jth evaluation index d of scheme i ij (1≤i≤n,1≤j≤m) attribute value after dimensionless processing; is the reference value of the evaluation index, taking the minimum value of the index in each scheme; Determine the grey correlation coefficient of the jth evaluation index of the i-th scheme Where: ρ is the resolution coefficient; is the absolute minimum; is the absolute maximum value; Determine the grey correlation degree P of the decision-making scheme i : The evaluation result output module is used to output the evaluation result of the quality of the evaluation, the grey correlation degree P i The larger the value, the closer it is to the optimal evaluation index.

8. The comprehensive evaluation system for the control effect of an underwater target electromagnetic field according to claim 1 is characterized in that: The underwater target electromagnetic field control effect comprehensive evaluation system also includes an electromagnetic field characteristic data storage module, which is used to store various electromagnetic field characteristic original data of the underwater target measured at a measurement station or the like.

9. The comprehensive evaluation system for the control effect of an underwater target electromagnetic field according to claim 1, characterized in that: The comprehensive evaluation system for the control effect of the underwater target electromagnetic field also includes an electromagnetic field characteristic data classification module, which is used to perform time-frequency analysis on the original electromagnetic field characteristic data and classify the original data according to the established underwater target electromagnetic field control index system to obtain evaluation index parameters for the control effects of different electromagnetic field sources.

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