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脈沖渦流TR探頭解析模型的快速求解方法
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南京航空航天大學(xué)自動(dòng)化學(xué)院

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TG115.28

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國家重點(diǎn)研發(fā)計劃課題(2018YFF01012900),中國自然科學(xué)基金青年(61903193),中國博士后科學(xué)基金第67批面上基金(2020M671476),南京航空航天大學(xué)2020年研究生開(kāi)放(kfjj20200317),南京航空航天大學(xué)2021年江蘇省研究生實(shí)踐創(chuàng )新計劃(SJCX21_0100)。


Research on lift-off measurement method based on pulsed eddy current transmit-receive probe
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    摘要:

    作為分析脈沖渦流響應的常用工具,解析模型因具有物理意義明確、精度高、計算速度快等優(yōu)點(diǎn)而得到了廣泛關(guān)注。近年來(lái),隨著(zhù)脈沖渦流陣列探頭的應用,對其陣列單元——即激勵和接收線(xiàn)圈非同軸的Transmitter-Receiver陣列單元(以下簡(jiǎn)稱(chēng)TR探頭)的解析分析需求迫切。而當前關(guān)于TR探頭的解析模型大多數將試件缺陷等效為大面積壁厚減薄缺陷,模型精度較低。為提高TR傳感器解析模型的求解精度,將構件缺陷等效為平底盲孔缺陷,建立了含平底盲孔構件脈沖渦流TR探頭的解析模型,且提出了一種快速求解該模型解析解的方法:首先,通過(guò)分析典型模型解析解的形式,發(fā)現其由廣義反射系數、線(xiàn)圈系數等乘積組成,且廣義反射系數僅與構件結構有關(guān),線(xiàn)圈系數僅與探頭有關(guān);然后,參考已有的含平底盲孔構件同軸式探頭檢測模型和均勻壁厚減薄缺陷的TR探頭模型,分別獲取廣義反射系數和線(xiàn)圈系數解析表達式;最后,將其組合得到含平底盲孔構件脈沖渦流TR探頭的解析解。通過(guò)和實(shí)驗數據做比較驗證了上述解析解的正確性。所提出的方法可應用到其他脈沖渦流解析模型的快速求解中,降低解析模型的求解難度。

    Abstract:

    As a common tool for analyzing the response of pulsed eddy current, an analytical model has been widely paid attention because of its advantages, such as clear physical meaning, high accuracy, fast calculation speed, etc. In recent years, with the application of pulsed eddy current array probe, an analysis of the transmitter and receiver array unit (hereinafter referred to as TR probe), whose coils are not coaxial, is in urgent need. However, the component defect is always equivalent to a large area wall thinning defect in most of the analytical models of TR probe, which causes a low calculation accuracy. In order to improve the solution accuracy of the analytical model of the TR sensor, the component defect is equivalent to a flat-bottomed blind hole defect, an analytical model of the pulse eddy current TR probe for a component with a flat-bottomed blind hole is established, and a fast method to solve the analytical model is proposed: Firstly, by analyzing the typical model, it is found that the form of its analytical solution is composed of the product of generalized reflection coefficient, coil coefficient, etc. The generalized reflection coefficient is only related to the structure of the component, and the coil coefficient is only related to the probe. Then, by referring to the coaxial probe detection model with flat-bottomed blind hole component and the TR probe model with uniform wall thickness thinning defect, the analytical expressions of generalized reflection coefficient and coil coefficient are obtained, respectively. Finally, the analytical solutions of pulsed eddy current TR probe with flat-bottomed blind hole component can be calculated by combining these two coefficients. The correctness of the above analytical solution is verified by comparison with experimental data. The proposed method can be applied to the rapid solution of other pulsed eddy current analytical models, reducing the difficulty of solving analytical models.

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張卿,李曉光,孫加偉,孔玉瑩,朱悅銘,程婧婷,王海濤.脈沖渦流TR探頭解析模型的快速求解方法計算機測量與控制[J].,2022,30(2):172-178.

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  • 收稿日期:2021-07-08
  • 最后修改日期:2021-08-04
  • 錄用日期:2021-08-06
  • 在線(xiàn)發(fā)布日期: 2022-02-22
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