Машинобудування http://repo.uipa.edu.ua/jspui/handle/123456789/625 2026-04-08T00:38:39Z 2026-04-08T00:38:39Z Фідровська, Н. М. Перевозник, І. А. http://repo.uipa.edu.ua/jspui/handle/123456789/9035 2024-10-31T10:23:21Z 2018-01-01T00:00:00Z

Название: Вплив засобу встановлення підкранової рейки на її напружений стан Авторы: Фідровська, Н. М.; Перевозник, І. А. Краткий осмотр (реферат): В статті розроблено різні схеми встановлення підкранової рейки і проведено розрахунки з урахуванням умов встановлення рейкової колії на мосту крана та закону розподілення навантаження від дії ходових колес, які пересуваються по головній балці мосту мостового крану.

2018-01-01T00:00:00Z Ковалевський, С. В. Залужна, Г. В. http://repo.uipa.edu.ua/jspui/handle/123456789/9034 2024-10-31T10:14:47Z 2018-01-01T00:00:00Z

Название: Шляхи підвищення надійності та забезпечення швидкодії спрацювання запираючих пристроїв пневмотранспортних установок для належного захисту навколишнього середовища Авторы: Ковалевський, С. В.; Залужна, Г. В.

2018-01-01T00:00:00Z Фролов, Е. А. Коробко, Б. О. Агарков, В. В. Дерябкина, Е. С. Frolov, E. Korobko, В. Agarkov., V. Deryabkina, E. http://repo.uipa.edu.ua/jspui/handle/123456789/9033 2024-10-30T09:59:14Z 2019-01-01T00:00:00Z

Название: Определение частоты свободных колебаний жесткого фундамента на упругом основании под действием импульса взрыва Авторы: Фролов, Е. А.; Коробко, Б. О.; Агарков, В. В.; Дерябкина, Е. С.; Frolov, E.; Korobko, В.; Agarkov., V.; Deryabkina, E. Краткий осмотр (реферат): The aim of the research was to create reliable methods for calculating foundations that en­sure the safe operation of stamping parts using shock-impulse loading (electro-hydraulic shock, ex­plosive loading, pneumatic and static-dynamic shock). For calculation, we consider a foundation located on the surface of an elastic base and loaded with an asymmetric load P (r, t). Considering the foundation to be rigid, a differential equation for the movement of the foundation without vibra­tions is obtained. Further, we assume that there is no horizontal displacement, then this assumption and the asymmetric nature of the problem make it possible to use the variational solution method. This allows you to write a differential equation, then the oscillatory motion of the elastic base under load is equal to the magnitude of the reaction of the soil located under the foundation. The obtained equation describes the movement of the elastic element outside the base and allows you to take into account the influence of the elastic and inertial forces of the soil in this area on the parameters of the movement of the foundation.It is assumed that the vibrational shape of the elastic base corresponds to a static draft. A general solution of the oscillation equation is obtained in the form of a modified Bessel function. Having completed the necessary transformations, we find that under the action of an instantaneous impulse, a rigid foundation on an elastic base performs harmonic oscillations with a circular fre­quency. To calculate the coefficients, you must know the nature of the movement along the depth of the base. The expressions obtained in the article for determining the frequency of free vibrations of a rigid foundation on an elastic foundation under the influence of pulsed loading allow us to solve a number of problems in choosing the modes of foundations of technological installations for shock- pulse loading carried out by the explosion energy in a hydraulic medium.

2019-01-01T00:00:00Z Ситников, Б. В. Маршуба, В. П. Мірошниченко, Н. М. Соловей, Л. В. Широков, Стефан Sitnikov, B. Marshuba, V. Miroshnichenko, N. Solovey, L. Shirokov, Stefan http://repo.uipa.edu.ua/jspui/handle/123456789/9032 2024-10-30T09:50:34Z 2019-01-01T00:00:00Z

Название: Використання інтегрованих технологій при визначенні поперечних деформацій металу в зоні шва при аргонодуговому зварюванні алюмінію марки АД0 Авторы: Ситников, Б. В.; Маршуба, В. П.; Мірошниченко, Н. М.; Соловей, Л. В.; Широков, Стефан; Sitnikov, B.; Marshuba, V.; Miroshnichenko, N.; Solovey, L.; Shirokov, Stefan Краткий осмотр (реферат): An experimental study of the patterns of changes in transverse displacements in the weld zone during crystallization during argon-arc welding of AD0 grade aluminum with a non­consumable electrode was carried out. The data obtained can be used to select the optimal welding mode, safe from the point of view of crystallization cracking.The article discusses the feasibility of using statistical methods for analyzing the accuracy, stability and control of TP, provides for process control on only one indicator of product quality. For a dimensionless quality indicator, parameter estimates are considered and numerical characteristics of these models are found. Based on the obtained estimates, a method for determining the quality of technological processes in mechanical engineering is proposed.The results obtained indicate that when butt welding without a gap, the base distance, depending on the welding speed and preheating temperature, may decrease, increase or remain unchanged. The moment when the rapprochement of the base points begins is of greatest interest from the point of view of assessing the possibility of the formation of crystallization cracks in the weld. Conditions under which a decrease in the base distance occurs simultaneously with the crystallization of the metal in the analyzed section is safe when creating crystallization cracks, since the weakened section of the weld is subjected to compressive action from the surrounding metal, fully or partially compensates for tensile stresses, which are caused by complex shrinkage. If the base distance remains unchanged during crystallization, this indicates the presence of tensile stress, which is due to complicated shrinkage. This also creates the risk of crystallization cracks, since stresses are usually concentrated in the weakest axial region of the weld, where the metal hardens last.When welding plates made of aluminum, grade AD0, 4 mm thick, an increase in the welding speed from 8 to 32 m/h leads to tensile stresses in the region where the weld metal is in a solid- liquid state, which can lead to crystallization cracks.

2019-01-01T00:00:00Z