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Method and system for determining grain size of alloy based on mapping monotonicity

A technology of grain size and determination method, used in manufacturing computing systems, instruments, design optimization/simulation, etc., can solve the problems of low evaluation accuracy, loss of evaluation effect, lack of accuracy of evaluation models, etc., and achieve small errors and measurement accuracy. High, good monotonicity

Active Publication Date: 2018-12-18
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the linear relationship between a single ultrasonic testing parameter and the grain size is only established, and the information about the grain size carried by characteristic parameters such as sound velocity, attenuation coefficient and nonlinear coefficient are all different, which leads to the lack of accuracy of the evaluation model
For the existing multi-parameter evaluation scheme, due to the increase of complex information on the microscopic grain size of the material to be tested, the grain size ultrasonic evaluation method built with the goal of minimizing the error cannot effectively characterize the grain size of complex alloy materials, forming an incomplete The monotonic curve makes the evaluation accuracy low, and even loses the evaluation effect

Method used

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  • Method and system for determining grain size of alloy based on mapping monotonicity
  • Method and system for determining grain size of alloy based on mapping monotonicity
  • Method and system for determining grain size of alloy based on mapping monotonicity

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Embodiment 1

[0075] figure 1 It is a flowchart of a method for determining alloy grain size based on mapping monotonicity provided by Embodiment 1 of the present invention. Such as figure 1 Shown, a kind of determination method based on the alloy grain size of mapping monotonicity, described determination method comprises:

[0076] Step 101: Obtain the ultrasonic fixed-point scanning signal, average thickness value, and grain size value of each experimental sample;

[0077] Step 102: Determine each ultrasonic detection parameter value of each experimental sample according to the average thickness value and the ultrasonic fixed-point scanning signal;

[0078] Step 103: Acquire interval step size, minimum threshold and current selection moment;

[0079] Step 104: According to the interval step size and the selection time, adopt the formula: determining the selection interval corresponding to the selection moment, where t represents the selection moment, Indicates the interval step siz...

Embodiment 2

[0102] figure 2A structural block diagram of a system for determining alloy grain size based on mapping monotonicity provided by Embodiment 2 of the present invention. Such as figure 2 Shown, a kind of determination system of alloy grain size, described determination system comprises:

[0103] The sample parameter acquisition module 201 is used to acquire the ultrasonic fixed-point scanning signal, average thickness value, and grain size value of each experimental sample;

[0104] An ultrasonic detection parameter value determination module 202, configured to determine each ultrasonic detection parameter value of each experimental sample according to the average thickness value and the ultrasonic fixed-point scanning signal;

[0105] Selection parameter acquisition module 203, used to acquire interval step size, minimum threshold and current selection moment;

[0106] Select the interval determination module 204, for according to the formula: determining the selection i...

Embodiment 3

[0128] In this embodiment, the influence of monotonic performance is taken as a strategy, and multiple ultrasonic detection parameters are preferably reduced to single-dimensional parameters and normalized, and the grain size of the primary α phase is fitted through a one-time item and the monotonicity (reduced to single-dimensional ultrasonic parameters) is formulated. The maximum sequence difference of detection parameter sample points (both positive or negative) is the optimization goal, and the self-adaptive differential evolution algorithm (self-adaptive differential evolution, SADE) algorithm is used to determine the optimization problem to optimize the goal, and the corresponding mapping function and fitting function are obtained by solving The undetermined coefficient of , so as to establish an ultrasonic evaluation method for the grain size of TC4 primary α phase that maps monotonicity.

[0129] Step 1: Conduct an experiment to obtain the ultrasonic fixed-point scannin...

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Abstract

The invention discloses a method and a system for determining the grain size of alloy based on mapping monotonicity. The invention adopts correlation measurement criterion to screen effective ultrasonic detection parameters step by step, and then with the monotonicity maximization objective, according to the final set of effective ultrasonic testing parameters, a soft-sensing model of grain size is established, which not only keeps the form of monotonous increasing or decreasing, but also realizes the validity of off-set testing of samples under the condition of ordered arrangement of grain size. Therefo0re, the soft sensing model of grain size established by the determination method and the determination system provided by the invention has the advantages of high measurement accuracy, good monotonicity, small error, intuitive and complete result diagram of the model and stable evaluation effect.

Description

technical field [0001] The invention relates to the field of ultrasonic detection technology and its characterization of alloy grain size, in particular to a method and system for determining alloy grain size based on mapping monotonicity. Background technique [0002] Titanium alloy has elastic resistance, corrosion resistance, fatigue resistance and good heat resistance, and is widely used in defense equipment such as advanced aircraft, spacecraft, high thrust-to-weight ratio aero-engines, ships, etc., as aero-engine fans and compressor wheels The components of key parts such as blades and blades are known as "space metal". The grain size of the primary α phase of titanium alloy has a certain influence on the yield strength, fatigue performance and corrosion resistance, and its various macroscopic properties will form corresponding characteristic responses with the change of grain size. Due to the particularity and importance of the application of titanium alloys are irre...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20Y02P90/30
Inventor 陈昊董金龙黎明邬冠华陈曦张聪炫李军华
Owner NANCHANG HANGKONG UNIVERSITY
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