期刊名称：Scientific Journals of the Maritime University of Szczecin
印刷版ISSN：1733-8670
电子版ISSN：2392-0378
出版年度：2018
卷号：56
页码：41-46
DOI：10.17402/312
语种：English
出版社：MUS
摘要：The authors of this article have been looking for new parameters and dynamic characteristics which can be applied to the non–destructive testing of welded joints.All the characteristics have been based on the recorded data generated during the vibration tests of welded joints both with and without failures.This article has dealt with the methods of assessing welded joints using either 2D or 3D time–frequency dynamic characteristics.The calculation procedure that was used for analyzing the simultaneous changes of the response modules,registered by acceleration sensors,has been presented.The vibration amplitudes were transformed into a function of time and frequency (simultaneously) and presented over 2D or 3D time–frequency characteristics.The analyses of the characteristics were performed for a plate without a welded joint,for a plate with a non–defective welded joint and for a plate with a defective welded joint caused by edge bonding.Having analyzed and registered the 2D or 3D time–frequency dynamic characteristics it could be noticed that by presenting the responses,analyzed simultaneously against time and frequency,allowed for the evaluation of whether the examined system maintained non–linearity and,at the same time,allowed for the quality of the welded joint to be indirectly assessed.The proposed measurement parameters of the quality of a welded joint can be defined as a dispersion of the colors from the obtained characteristics.The faults (and the vibration nonlinearity) of the welded joints will be bigger if the dispersion is greater.
其他摘要：Представлены теоретико–методические основы и практический опыт созда– ния обзорной электронной карты «Геосистемы бассейна оз.Байкал» и производных от неё– «Чувствительность» и «Экологическая устойчивость» геосистем бассейна оз.Байкал» для решения задач устойчивого развития.Специфика исследования заключается в развитии геосистемного картографического аспекта как основного приема анализа и синтеза гео– графической информации о природной среде исследуемого региона,а также географическо– го прогноза ее возможных изменений в результате спонтанного развития или внешнего,в том числе антропогенного воздействия.Базовая карта составлена на принципах региональ– но–типологического подхода и структурно–функциональной классификации геосистем,про– изводные–посредством экологической интерпретации информации базовой карты..
