obr2The article describes a diagnostic method, on the basis of which it is possible to assess whether there is a loose connection in the clamping system (detection) and to determine which of them is loose (localization) and what extent of release occurred (quantification). The diagnostic method is based on comparing the drops in the natural frequencies of a measured system with respect to a reference system, which simulates the desired state. When analysing the drop in natural frequencies in order to locate the loosening, it is necessary to relate this drop to the position of the clamping joints within the considered mode shape. To determine the extent of loosening, it is necessary to know the relationship between the changes in natural frequencies and the modeled loosening of clamping joints.

Stephan Nell, United Grinding Group AgThe UNITED GRINDING Group, one of the world's leading machine tool manufacturers, and its long-standing partner company in the Indian market, Francis Klein, are pooling their expertise in a joint venture.

Sosnovich Olesia robot figAbstract: In the modern world, communications representing pipelines with various lengths, sections and axis shapes are widely used, for example, pipelines for supplying and discharging water, oil, gas, etc. The total length of pipelines is millions of kilometers, therefore, issues of efficient operation and services are relevant.

0901d19680367714 Gas production on the sea at sunrise shutterstock 186689360The main task to reduce environmental pollution and increase the profitability of oil fields is to extract unstable and stable hydrocarbons from associated petroleum gas. In this case, it is possible to obtain a liquid fraction, which can be transported by mobile transport.

20 01 13 imageThe paper deals with the question of modeling of the drill mandrel with the shock absorber connected to the mandrel using a viscoelastic clutch. A mathematical model of drill mandrel vibration, machine support and inertia (damper) in the form of a differential equation system has been developed.

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