Розглянуто умови виникнення хитливої роботи шнека, коли сумарною напірною характеристикою шнеко-відцентрового насоса є спадаюча функція витрати.

Розглянуто способи забезпечення стійкості роботи шнекової електротепломеханічної системи в області низьких частот обертання. Запропоновано основу для створення методик проектування ШЕТМС на базі характеристик режиму навантаження, що враховує розподіл моментів руху, теплогідродинамічний і технологічний вплив.

Індекс рубрикатора НБУВ: И310.13 + И131.111.6

Рубрики:

Розробка потужних пластів

Шнекове буріння свердловин

Шифр НБУВ: РА321845 Пошук видання у каталогах НБУВ 

Purpose. To analyze the impulsive force impact on nonlinear torsional vibrations of a screw. Methodology. The methodology is based on the Bubnova - Galorcina's and Van-der-Pol's methods combination, which allowed receiving the equations in a standard form in terms of the impulsive force impacts. Findings. The mathematical model of torsional vibrations of the screw in terms of the impulsive force impact was presented. The abrupt nature of changes in the amplitude-frequency characteristics of torsional vibrations of the screw was studied. The resonance torsional vibrations of the screw were considered under the impulsive force impacts. The torsional vibrations of the screw were explored on condition that the moment of forces of resistance is proportional to the relative angular velocity of the screw motion and the moment of impulsive forces is approximated by a nonlinear function. It has been determined, that in such a case the influence of impulsive forces becomes apparent only while changing the screw vibration frequency. The amplitude frequency characteristics of the torsional vibrations of the screw in different geometric parameters were presented. Originality. The influence of impulsive forces on resonance and on non-resonance torsional vibrations of the screw was explored. The proper amplitude frequency characteristics were established. Practical value. It has been established that in the non-resonance terms the impulsive nature of the screw loading results in the abrupt change of the screw amplitude and the phase of vibrations when the impulsive forces are performed. Its influence rises as the time of the screw machines exploration passes and it can result in considerable amplitudes of torsional vibrations of the screw. It has been established that the screw resonance falls as the vibration frequency raises.

Purpose. To create a mechatron model of vacuum tube vibration system for rock cutting by flat auger tools based on physical and mechanical properties of processed array and kinematic characteristics of the instrument. Methodology. The analytical model of the fracture process of rock cutting by tool vibration considering plastic properties of the massif was developed. The main technological parameters of massif vibrating cutting with normal variations were modelled: dependences of normal and tangential pressure in the zone of working body interaction with the medium, normal and shear stresses in the zone of destruction, rock characteristics of the medium, vibration parameter dependences on the characteristics of mechatronic system geometry of the contact area of flat chisel treated with medium. Findings. The choice of the computational model of the vibration rock cutting with the normal to the direction of movement of the working body fluctuations was substantiated considering the processes arising from destruction: the occurrence of compressive and tensile stresses. The main stages and interconnection options in the simulation of vibration cutting were established. Originality. Scientific novelty lies in the development of a method of analysis of contact interaction of roller working body molding machine with an array taking into account the changes in the stabilization process of physical and mechanical properties of the treated medium, the aim of which is to predict the required voltage and depth of the formed layer. Practical value. The theoretical basis of rock cutting by flat auger tool taking into account the normal component of the vibration with regard to the movement direction allowing for the deformation of the rock mass and the contact interaction with the working body was established, that allows improving the technology of drilling wells by reducing the power consumption of the cutting process. The results enable us to determine the parameters of power and kinematic conditions for the occurrence of the vibration cutting.