M.S. Gubin1

1 St. Petersburg State University of Aerospace Instrumentation (St. Petersburg, Russia)

1 gubin.maxim@mail.ru

At the moment, products of complex geometric shapes such as Laval nozzles are widely used in industry. The work related to increasing the operational life of these products is relevant today. The creation of these products entails the use of a number of labor-intensive technological operations. At the same time, control of some product parameters is carried out by testing sample units from the series. Also, at the moment, some enterprises use non-destructive testing methods (eddy current control and magnetic control methods), but due to their use in manual mode, the control has low reliability and high labor intensity due to the human factor, since it is necessary to ensure a number of requirements for positioning transducers relative to the surface of products of complex geometric shape. There is also no data reflecting the effect of the curvature of the surface of products of complex geometric shapes such as Laval nozzles on the results of the measured parameters. Existing studies, as well as mathematical models, do not take into account the curvature of the surface. The purpose of the work is to increase the reliability and reduce the complexity of non-destructive quality control of coatings for products of complex geometric shapes such as Laval nozzles. In this paper, we investigate the effect of the accuracy of the spatial location of an eddy current transducer relative to the surface of a product of complex geometric shape on the results of the received signal from the eddy current transducer. The theoretical aspects reflecting the relationship between the deviation from the normal of the eddy current transducer and the surface of the object, the gap between the sensing element of the eddy current transducer and the surface of the object on the results of the received signal are presented. The received signal of an eddy current converter is modeled at different positions of the eddy current converter relative to the surface of a product of complex geometric shape such as a Laval nozzle in a Comsol Multiphysics environment. Based on the simulation, it is determined that the density of eddy currents increases as the radius of the conical surface decreases along the length. The results of the study showed that with an increase in the gap and deviation from the normal, the impedance increases, as the effect of the secondary magnetic field decreases. The presence of a conductive object is indicated by specific impedance values. At the same time, the impedance values differ from the values obtained as a result of modeling on products without curvature, with other identical model parameters. Accordingly, the positioning of the sensor relative to the ISGF based on the calculation of the analytical dependence is impossible, therefore, in order to obtain reliable control results, it is necessary to adjust the spatial location of the eddy current transducer relative to the surface of the product of complex geometric shape, based on the measurement results of the current impedance values.

Gubin M.S. Influence of the spatial location of a parametric eddy current sensor relative to the surface of a controlled product of complex geometric shape on the measured values. Information-measuring and Control Systems. 2025. V. 23. № 4. P. 13−18. DOI: https://doi.org/10.18127/j20700814-202504-02 (in Russian)

1. GOST 27.002-2015. Nadezhnost v tekhnike. Terminy i opredeleniya. M.: Standartinform. 2017. 4 s. (in Russian)
2. Dobrovolskii M.V. Zhidkostnye raketnye dvigateli. Osnovy proektirovaniya: uchebnik dlya vysshikh uchebnykh zavedenii. Pod red. D.A. Yagodnikova. Izd. 3-e, dop. M.: Izdatelstvo MGTU im. N.E. Baumana. 2016. 461 s. (in Russian)
3. Kaloshin V.A. Issledovanie i razrabotka metoda nerazrushayushchego kontrolya kachestva nikelevykh i nikel-khromovykh pokrytii uzlov zhidkostnykh raketnykh dvigatelei. Dissertatsiya na soiskanie uchenoi stepeni kandidata tekhnicheskikh nauk. Spetsialnost 05.11.13 "Pribory i metody kontrolya prirodnoi sredy, veshchestv, materialov i izdelii". NPO "Energomash" im. V.P. Glushko. M.: 2013. 173 s. (in Russian)
4. GOST R ISO 15549-2009. Kontrol nerazrushayushchii. Kontrol vikhretokovyi. Osnovnye polozheniya. M.: Standartinform. 2009. 7 s. (in Russian)
5. RD 32.150-2000 Vikhretokovyi metod nerazrushayushchego kontrolya detalei vagonov. Gosudarstvennoe unitarnoe predpriyatie "Vseros. nauchno-issledovatelskii institut zheleznodorozhnogo transporta (GUP VNIIZhT) MPS Rossii": M.: Standartinform. 2016. S. 65−70. (in Russian)
6. Ganzen M.I. Robotizirovannyi vikhretokovyi kontrol detalei GTD s ispolzovaniem neironnykh setei. Rybinsk: Vestnik RGATA imeni P.A. Soloveva. 2019. S. 65−70. (in Russian)
7. Glazunova V.A., Kheilo S.V. Novye mekhanizmy robototekhnicheskikh i izmeritelnykh sistem M.: Tekhnosfera. 2022. 244 s. (in Russian)
8. Sergeev D.S., Barinov A.V., Kinzhagulov I.Yu., Smirnov A.A., Stepanova K.A., Kaloshin V.A., Perfilov A.M., Machikhin A.S. Avtomatizirovannyi kompleks kontrolya tolshchiny tekhnologicheskikh pokrytii elementov ZhRD. Sb. trudov NPO Energomash. 2016. № 32. S. 275−288. (in Russian)
9. Blokhina E.V., Minchuk S.V., Pavlov V.V., Andronova N.V. Sozdanie kompleksa avtomatizirovannogo kontrolya tolshchiny teplozashchitnogo pokrytiya korpusov dvigatelei reaktivnykh snaryadov. Tekhnika XXI veka glazami molodykh uchenykh i spetsialistov. 2020. № 18. S. 217−222. (in Russian)
10. Carmelo Mineo, Stephen Gareth Pierce, Ben Wright. Robotic path planning for non-destructive testing of complex shaped surfaces. AIP Conference Proceedings. 2015. V. 1806. P. 1977−1987.
11. Bobrov A.L., Vlasov K.V., Lesnykh E.V. Osnovy vikhretokovogo nerazrushayushchego kontrolya: Ucheb. posobie. Sib. gos. un-t putei soobshcheniya. Novosibirsk: Izd-vo SGUPS. 2022. 123 s. (in Russian)
12. Nerazrushayushchii kontrol: Spravochnik. V 7 tomakh. Pod obshch. red. V.V. Klyueva. T. 2. M.: Mashinostroenie. 2003. 608 s. (in Russian)