Івано-Франківський національний технічний університет нафти і газу, вул. Карпатська, 15, 76019 Івано-Франківськ, Україна Запропоновано математичний модель міцнісних властивостей металевих труб під дією ударних навантажень. Одержано аналітичний розв'язок ди-намічної задачі пружніх коливань прихоплених бурильних труб із вмон-тованим механічним ясом. На основі результатів чисельного моделюван-ня проведено оцінку міцности прихопленої металевої труби з урахуван-ням пружньо-пластичних властивостей матеріялу. Наведено рекоменда-ції з підбору матеріялу для трубопроводу бурильних установок.Ключові слова: пружні хвилі, напруженість, пластичність, границя міц-ности, бурильна колона, металева труба, прихоплення.The mathematical model for describing strength properties of metal pipes under the shock loads' influence is proposed. An analytical solution of the dynamical problem of elastic vibrations of stuck drilling pipe with integrated mechanical jar is obtained. Based on results of numerical simulation, the strength of stuck metal pipe is assessed with taking into account elastoplastic material properties. The guidelines for the selection of material for piping drill rigs are represented.
The article examines the transport system with flywheel engine, which is increasingly used in technology. It is an ecologically clean energy source with a high specific power. It is reliable and durable.
The mechanical system occupies an intermediate place between the gyroscope and the flywheel, which rotates in rigidly fixed supports. It is necessary to conduct the row of researches on vibrofirmness for creation of such mechanical systems, to estimate them dynamic properties and to give out recommendations on creation of transport vehicles with the inertia stores of energy. Dependences of system kinetic and potential energy changes, Rayleigh function was brought by researchers. Damping of supports resilient elements was taken into account. Equalizations of the mechanical system motion were gotten. The analysis of fly-wheel motion was conducted and influence of equalizations nonlinear members on firmness of the mechanical system is conducted. The change of fly-wheel motion frequencies with depending on the parameters of the mechanical system was certain and its fitness for the practical use was appraised. Dependences of vibrations frequencies changes on the angulator of fly-wheel were gotten.
It was set that frequency of nutation at the increase of angulator of fly-wheel grows, and frequency of recession diminishes. Frequency of nutation with the increase of resilient elements inflexibility of supports grows also and the oscillations of the flywheel and the parameters of the mechanical system are interrelated.
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