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Neutron energy spectrum real number solution genetic algorithm with linear constraint

A genetic algorithm and linear constraint technology, applied in genetic models and other directions, can solve problems such as ineffective use of initial information and discrete solution space, low accuracy of spectral solution results, and SAND-II iterative algorithm relying on initial spectrum, etc., to achieve Prevent local optimal convergence, improve calculation speed, and avoid the effects of immature convergence

Inactive Publication Date: 2019-06-25
NORTHWEST INST OF NUCLEAR TECH
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Problems solved by technology

[0050] The purpose of the present invention is to provide a real-number genetic algorithm for neutron energy spectrum resolution with linear constraints, to solve the problem that the accuracy of the simple genetic algorithm is not high, the initial information problem and the solution space discrete problem cannot be effectively used, and at the same time solve the problem of SAND-II The iterative algorithm requires accurate group-to-group correspondence to the initial spectral problem and the SAND-II iterative algorithm heavily relies on the initial spectral problem

Method used

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  • Neutron energy spectrum real number solution genetic algorithm with linear constraint
  • Neutron energy spectrum real number solution genetic algorithm with linear constraint
  • Neutron energy spectrum real number solution genetic algorithm with linear constraint

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Embodiment Construction

[0097] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0098] The flow chart of the steps of the real number genetic algorithm spectrum resolution method in this embodiment is as follows image 3 Shown:

[0099] 1. Irradiate a series of activated foils in the neutron radiation field to be measured. These activated foils are irradiated to induce radioactivity. After the irradiation is over, take out these activated foils, measure their radioactivity, and process to obtain the measured activation rate. (is the method's data preparation).

[0100] 2. Determine the solution space range, the upper limit of the solution space range is taken as ub (unit: n cm -2 ·s -1 ), the lower limit of the solution space is taken as lb (unit: n cm -2 ·s -1 ).

[0101] 3. Randomly select N according to a uniform distribution within the scope of the solution space 0 initial spectrum, the initial spectrum is 640 g...

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Abstract

The invention relates to a neutron spectrum real number solution genetic algorithm with linear constraint, a constraint penalty function is introduced in the algorithm process, priori information of afew groups can be fully utilized, and the accuracy and the calculation speed of the spectrum solution method can be effectively improved by using valuable priori information. Solving the problems that simple genetic algorithm is not accurate, and cannot effectively use the initial information problem and the solution space discrete. At the same time, solving the SAND-II iterative algorithm requires accurate cluster corresponding initial spectrum problem and the SAND-II iterative algorithm is heavily dependent on the initial spectrum.

Description

technical field [0001] The invention relates to a neutron energy spectrum solution algorithm, in particular to a neutron energy spectrum solution real number genetic algorithm with linear constraints. Background technique [0002] When the multi-foil activation method is used to measure the neutron energy spectrum, a group of foil detectors with known cross-sections are put into the neutron field to be irradiated. Due to the nuclear reaction between the neutrons and the detectors, the irradiated foil detectors It is activated to produce induced radioactivity; by measuring the radioactivity of the foil detector after irradiation, the mononuclear activation rate of a group of nuclides can be obtained, and the relationship between the irradiated neutron energy spectrum and the mononuclear activation rate can be determined. Measure the neutron spectrum. [0003] Under steady-state conditions, the illuminated foil detector satisfies the activation equation: [0004] [0005]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06N3/12
Inventor 李达张守杰马燕苏春磊宋晓靓于青玉余小任苗亮亮朱广宁
Owner NORTHWEST INST OF NUCLEAR TECH
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