Modelling of Piling Technology by Vibroimpact Device with Hydropulse Drive

Abstract

Based on the analysis of the developed mathematical model, this paper proposes optimal operating modes of the vibroimpact device to ensure the intensification of driving construction piles. It is an original design of a modern, highly efficient device for driving construction piles, equipped with a compact, powerful hydraulic impulse drive unit. To develop a mathematical model of the construction pile driving technology, the following methods were used: mechanoreological phenomenology, hydrodynamics, and generalised laws of mechanics. Mathematical models of the dynamics of technological processes of driving construction piles with a vibroimpact device are improved based on a hydraulic impulse drive unit in the form of a spatial non-stationary formulation of the problem and integral equations of dynamic characteristics of the moving elements of the drive unit. The study obtained the distribution of the pressure and velocity of the working fluid in the hydraulic unit of the vibroimpact device, as well as changes in the kinematic parameters of the elements of the technological equipment based on the mathematical model developed by the finite volume method, using numerical modelling and high-performance computer systems. Optimal modes of operation of a hydraulic impulse drive of a vibroimpact device are proposed to provide an intensification of the construction pile driving technology. It was found that when low-frequency vibration is applied, the driving of construction piles is intensified. Application of a hydraulic impulse drive that is based on two-stage vibration excitation allowed implementing the vibroimpact modes of the device. The average pile driving speed with a vibroimpact interaction is five times higher compared to conventional driving methods

Modeling of Wave Processes in Hydraulic Drive Systems of Technological Equipment

“…The time constants TT1 and TT2 and the relative damping coefficients ξТ1 and ξТ2 are determined from the frequency characteristics of the hydraulic lines with the distribution parameters described by equations ( 4), based on the condition of equality of the first resonant frequencies and amplitudes (at these frequencies) of the characteristics of the corresponding elements AT(jω), BT(jω), CT(jω), and DT(jω) based on equations ( 4) and (8). Under these conditions, the following relations will be obtained [4,8]:…”

“…It describes the properties of objects in a narrow range of changes in such operating parameters as the amplitude and frequency of oscillation of hydraulic drive elements. Moreover, this leads to the limitation of the area of use of the results of mathematical modeling, which do not take into account the influence of all transient processes in the hydraulic circuit [12], which leads to the accumulation of excess, not implemented by the systems of technological movements [2][3][4].…”

“…One of the current scientific problems in hydromechanics is the description of the motion of a viscous, weakly compressed fluid, which is described by the continuity and Navier-Stokes equations [4,10,11]. These include fluid movement problems during laminar and turbulent flow around bodies of finite dimensions, currents in the wake zone and areas of flow disruption, and mixing and boundary layers at the body surface [17].…”

“…Analyzing the ambiguity of the dynamic properties of hydraulic drive elements shows the fundamental complexity of the mathematical description of hydrodynamic processes. Thus, the modern hydraulic drive of technological equipment is classified as a complex dynamic object, for the effective study of which, it is advisable to use mathematical and computer modeling [4].…”

Dynamic Processes Modeling in a Peristaltic Pump with a Hydraulic Drive for the Bingham Fluid

“…Studies of the issue of the flow pulsations reducing of the mixture which is pumped have been considered in work [1]. One of the ways to reduce the pulsations can be the use of classical management methodology with a feedback mechanism [5]. In this case, however, a level decrease of pulsations leads to an increase in the injection pressure of the solution.…”