PSI - Issue 32

Available online at www.sciencedirect.com Available online at www.sciencedirect.com Sci nceDirect Structural Integrity Procedia 00 (2021) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2021) 000 – 000

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Procedia Structural Integrity 32 (2021) 299–305

© 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the XXIIth Winter School on Continuous Media Mechanics” Abstract An effective method that allows determining the presence of a defect and its characteristics is proposed. The proposed method is based on the control of changes in the parameters of dynamic process. To increase the informativeness of the proposed method the special mathematical approach for processing of the recorded signal is used. A special feature of the approach is an adaptively adjustable orthonormal basis. This approach maximizes the diversity of signal images obtained after processing, corresponding to the different types of defects. The proposed approach allows to significantly increase the efficiency of inhomogeneity recognition. A series of experiments demonstrating the high efficiency of the method is carried out. © 2021 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license ( https://creativecommons.org/licenses/by-nc-nd/4.0 ) Peer- review under responsibility of the scientific committee of the XXIIth Winter School on Continuous Media Mechanics” Keywords: heterogeneity, non-destructive testing, surface wave field 1. Introduction Nowadays scientist and engineers solve problem of structures material consumption reducing and design lightweight structures. As a result of weight optimization structures often operate at a high stress state. Continuous operation under high loads and vibrations can lead to the hidden defects and delamination that significantly reduce strength and stiffness characteristics of structures or even destruct them. This problem become especially actual then new materials are used for parts with increased requirements for their characteristics. To control the state of the Abstract An effective method that allows determining the presence of a defect and its characteristics is proposed. The proposed method is bas d on th contr l of change in the paramet rs of dynamic process. To in rease the nformativen ss of the pr posed method the special mathematical approach for processing of the recorded signal is used. A special feature of the approach is an a aptively adjustable orthonormal b sis. This approa h maximizes the diver ity of signal images obtained after processing, corresponding to the different types of defects. The proposed approach allows t ificantly increas the effici ncy of inhomoge ei y recognition. A series exp riments dem nstrating the high efficiency of the method s arri d out. © 2021 The uthor . Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license ( https://creativecommons.org/licenses/by-nc-nd/4.0 ) Peer- review u der responsibility of h scientific committee of the XXIIth Winter School on Continuous Media Mechanics” K ywords: heterog neity, non-des ructive te ting, surfa e wave field 1. Introduction Nowadays scientist and engineers solve problem of structures material consumption reducing and design lightweight stru tures. As a r sult of weight o timization structures often operate at a high stress state. Continuous operation under high loads and vibrations can lead to the hidden defects and delamination that ignificantly reduce str ngth and stiffness ch racteristics of stru tures or even destruct them. This problem become especially actual then new material are u ed for parts with increas d requirem nts for their c aracteristics. To control the sta e of the XXIIth Winter School on Continuous Media Mechanics Low frequency method for monitoring the state of structural heterogeneous objects Bocharova O.V. a, * , Andzjikovich I.E. b , Sedov A.V. c , Kalinchuk V.V. a,b a Southern Scientific Center of the Russian Academy of Sciences, Chehova st., 41, Rostov-on-Don 344006, Russia b Southern Federal University, Bolshaya Sadovaya st., 105/42, Rostov-on-Don 344006, Russia c Platov South-Russian State Polytechnic University, Prosveshcheniya st., 132, Novocherkassk 346428, Russia XXIIth Winter School on Continuous Media Mechanics Low frequency method for monitoring the state of structural heterogeneous objects Bocharova O.V. a, * , Andzjikovich I.E. b , Sedov A.V. c , Kalinchuk V.V. a,b a Southern Scientific Center of the Russian Academy of Sciences, Chehova st., 41, Rostov-on-Don 344006, Russia b outhern Federal University, Bolshaya Sadovaya st., 105/42, Rostov-on-Don 344006, Russia c Platov South-Russian St te Polytechnic University, Prosveshcheniya st., 132, Novocherkassk 346428, Russia

* Corresponding author. Tel.: +7-863-250-9810. E-mail address: olga.v.bocharova@gmail.com * Corresponding author. Tel.: +7-863-250-9810. E-mail ad ress: olga.v.bocharova@gmail.com

2452-3216 © 2021 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license ( https://creativecommons.org/licenses/by-nc-nd/4.0 ) Peer-review under responsibility of the scientific committee of the XXIIth Winter Sch ool on Continuous Media Mechanics” 2452-3216 © 2021 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license ( https://creativecommons.org/licenses/by-nc-nd/4.0 ) Peer-review u der re ponsibility of scientific committe of the XXIIth Winter Sch ool on Continuous Media Mechanics”

2452-3216 © 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the XXIIth Winter School on Continuous Media Mechanics” 10.1016/j.prostr.2021.09.043