Problems related to sustainable urban transport have gained in importance with the rapid growth of agglomerations. There is, therefore, a need support decision-making processes this area, trend that is visible literature. Many methods already been presented as useful tool field. However, it still significant challenge properly determine relevance criteria because one most critical points many techniques solve decision problems. In work, we propose two new approaches determining particular...

In the first part of this article devoted to assessment fatigue life structural steels at low temperatures, a study was conducted on effect pre-cycling in low-cycle mode time dependences acoustic emission parameters. Commonly used St-3 steel tested −60 °C with varying durabilities, after which it fractured once during static tests. The multilevel model made possible estimate parameter stage elastoplastic deformation. active development microcracks and their coalescence corresponds...

The article presents an approach to assessing the fracture toughness of structural alloys based on thermally activated crack growth and recording acoustic emission signals. kinetic features stable initiated are estimated using a multilevel model time dependence logarithm cumulative count. provides evaluation constants included in equation thermal fluctuation steps according literature sources method. It is shown that parameters such as activation energy, area before tip, rate non-activation...

The issues of durability and fatigue life various structural materials occupy an important place in the operation equipment elements subjected to high stresses. To correctly predict its time, knowledge unique internal structure a particular piece operating is required. obtain such data, multilevel model acoustic emission signal flow proposed article, which based on kinetic concept strength selection stages destruction kinetics damage accumulation. selected information, accounts for...

Прогнозирование напряженно-деформированного состояния трубопровода в зоне сварных соединений имеет важнейшее значение для решения задач по обеспечению его надежной и безопасной эксплуатации. С целью создания систем прогнозирования качества оптимизации управления сварочным производством настоящее время широко используется компьютерное моделирование сварочных процессов. При этом причине существенной сложности указанных процессов их описание математическими зависимостями крайне затруднительно,...

This article describes an approach that makes it possible to substantiate quality control criteria and methods improve strengthening technologies. The was used test the of products made using these technologies analyze different applied structural materials. In experiment, samples welded joints subjected various types were underwent acoustic emission (AE) testing. results quick evaluations produced by proposed multilevel model pulse flow compared with long-term cyclic tests make a conclusion...

The ambiguous connection between the results of acoustic emission control and strength materials makes acoustic-emission diagnosis ineffective actualizes problem metrological heterogeneity. Inhomogeneity is some deviation from a certain norm. real object always heterogeneous, homogeneity an assumption that simplifies image solution tasks associated with it. need to consider heterogeneity due clarify particular task transition more complex level research. Accounting for requires definition...

BAsed oN ACoUsTIC eMIssIoN PARAMeTeRsна примере производственных испытаний абсорбера очистки сероводорода и лабораторных колец, моделирующих корпуса подводных аппаратов, оптимизируется расчет анализируется диагностическая ценность вытекающих из микромеханической модели акустической эмиссии гетерогенных материалов, связанных с ресурсом акустико-эмиссионных показателей прочности