Pressure vessel LPMS quality estimation method based on simulation database
A technology for pressure vessel and quality estimation, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as unrealistic, reactor pressure vessel damage, etc.
Active Publication Date: 2015-11-11
XI AN JIAOTONG UNIV
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Problems solved by technology
However, in the actual nuclear power plant reactor pressure vessel, it is unrealistic to establish a database through a large number of knocking experiments, because a large number of knocking experiments will cause damage to the reactor pressure vessel
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[0049] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0050] Take the simulated collision experiment of loose parts as an example. The size of the steel plate used to establish the simulation database in the experiment is 200cm×200cm×2cm, and its schematic diagram is as follows figure 1 shown. The simulated structure of the reactor pressure vessel is as figure 2 As shown, its tip is used in the mass estimation experiment of this example.
[0051] Such as image 3 As shown, the pressure vessel LPMS quality estimation method based on the simulation database includes the following steps:
[0052] Step 1), simulation database establishment:
[0053]1.1) Install a first piezoelectric acceleration sensor at any position on the steel plate, and the first piezoelectric acceleration sensor is glued on the steel plate with 502 instant dry adhesive;
[0054] 1.2) Steel balls of different masses are dropped f...
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A pressure vessel LPMS quality estimation method based on a simulation database comprises steps of: disposing a piezoelectric acceleration sensor on a steel plate to collect impact signals corresponding to different mass from different falling heights; performing a Fourier transform to obtain a frequency spectrum; setting a cut-off frequency to obtain an effective frequency band and frequency spectrum; setting a polynomial fitting order to perform curve fitting on the effective frequency band and frequency spectrum; using the fitted curve as a sample to form a quality estimate simulation database; then, arranging one piezoelectric acceleration sensor in a pressure vessel of a nuclear reactor; obtaining 3-5 groups of calibration signals by a tapping experiment; performing correlation matching analysis between the calibration signal and the sample in the simulation database; performing quality estimation according to a correlation coefficient and sample information; solving an optimal correction coefficient; and finally, arranging three piezoelectric acceleration sensors at arbitrary positions of the pressure vessel; obtaining corrected quality estimation values; removing abnormal values; and calculating a final quality estimation value. According to the method provided by the present invention, the mass of a dropped loose part can be estimated accurately.
Description
technical field [0001] The invention relates to the technical field of LPMS fault diagnosis of nuclear power plant pressure vessels, in particular to a pressure vessel LPMS quality estimation method based on a simulation database. Background technique [0002] LPMS is one of the basic safety tools for the primary circuit of a nuclear power plant, and is of great significance to the safe operation of a nuclear power plant. 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. [0003] The invention patent with the application number of 201410667958.6 "a method for LPMS quality estimation based on data matching" achieves quality estimation by establishing a database. The accuracy of quality estimation in this method depend...
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Inventor 林京曾亮华佳东高飞罗志黄利平
Owner XI AN JIAOTONG UNIV