A method of lpms quality estimation based on data matching
A quality estimation and quality technology, applied in the field of nuclear engineering, can solve problems such as slow learning speed, a large number of training samples, convergence, etc., to achieve the effect of satisfying real-time monitoring, strong anti-interference ability, and improving robustness
Active Publication Date: 2017-09-12
XI AN JIAOTONG UNIV
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[0003] (1) A mass estimation method based on the energy ratio of the high and low frequency bands of the collision signal; this method is extremely dependent on the selection of the high and low frequency band boundary points, and at the same time depends on the selection of the high and low frequency bands. Improper selection of the above parameters will produce quality estimation results with large errors
[0004] (2) A quality estimation method based on spectral features and pattern recognition; a method for realizing LPMS quality estimation using pattern recognition and artificial neural network theory, mainly has the following problems: a large number of training samples are required, the learning speed is slow, and local convergence may occur
In this case, it is difficult to accurately reflect the quality characteristics and ensure the accuracy of quality estimation only by relying on frequency information
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[0043] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0044] Take the simulated collision experiment of loose parts as an example. The size of the steel plate used to simulate the reactor pressure vessel wall in the experiment is 200cm×200cm×2cm. In order to minimize the impact of environmental noise, buffer isolation is added under the four edges of the steel plate. Each buffer isolation is composed of 3 supporting steel plates and 3 rubber plates. Starting from the bottom layer, they are supporting steel plates, rubber plates, supporting steel plates, rubber plates, supporting steel plates, and rubber plates, with a total thickness of about 9.6cm. Wherein, the size of the supporting steel plate is 20cm×20cm×1.2cm, and the size of the rubber plate is 20cm×20cm×2cm.
[0045] Such as figure 1 As shown, a method for LPMS quality estimation based on data matching includes the following steps:
[0046] St...
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A LPMS quality estimation method based on data matching, first arrange piezoelectric acceleration sensors; then collect impact signals of different masses and different drop heights; then perform Fourier transform on these time-domain signals and convert them into spectrum; Set the cut-off frequency to obtain the effective frequency band spectrum; then set the polynomial fitting order to perform curve fitting on the effective frequency band spectrum; then use all the fitted curves as samples to form a quality estimation database; then carry out on-site data collection and obtain the fitted curve; then perform correlation matching analysis between the obtained curve and all samples in the database; then calculate the single-channel quality estimate based on the correlation coefficient and sample information; and then remove outliers to calculate the final quality estimate. The invention avoids the influence of falling height factors and environmental noise factors, has the advantages of high precision and strong anti-interference ability, and has robustness.
Description
technical field [0001] The invention relates to the technical field of nuclear engineering, in particular to an LPMS quality estimation method based on data matching. Background technique [0002] Loose part monitoring system (LPMS) is one of the basic safety tools for primary circuits of nuclear power plants, and is of great significance to the safe operation of nuclear power plants. Among them, the quality estimation of loose parts is one of the basic functions of LPMS system. Accurately estimate the mass of the loose parts when they are detached or collided, and then judge the type and degree of damage of the loose parts, providing a basis for subsequent fault diagnosis and elimination. The currently commonly used LPMS quality estimation methods are: [0003] (1) A mass estimation method based on the energy ratio of the high and low frequency bands of the collision signal; this method is extremely dependent on the selection of the high and low frequency band boundary po...
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IPC IPC(8): G06F19/00
Inventor 林京华佳东曾亮高飞黄利平罗志
Owner XI AN JIAOTONG UNIV