Development and research of elastic-damping device with variable stiffness

Abstract

The article is devoted to the reduction of dynamic loads of actuating mechanisms of mining machines based on the use of elastic-damping devices with variable parameters built into the construction of these machines. It is shown that the determination of the parameters of these devices can be represented as a solution of the inverse dynamic problem based on a differential equation with variable coefficients. Using the example of a damping device proposed for reducing the dynamic loads of the digging mechanism of dragline ES 20.90, we describe the procedure for constructing the desired differential equation for synthesizing the device parameters and present the results of a numerical study of its effectiveness.

A Study of the Effect of Impact Speed on the Dynamics of Mechanical Interactions of Bodies

“…Dynamic loads are dangerous, as they can reach large values and destroy the structures. Therefore, many scientific works are aimed at mathematical and physical modeling of the processes of interaction of bodies and mechanical systems under dynamic loads [1,2,[19][20][21][22][23].…”

“…There are a lot of studies dealing with the issue of dynamic interactions of bodies and mechanical systems. This trend is due to the wider use of dynamic processes (vibration and impact) when designing technological machines [1,2]. Working conditions of machines are becoming increasingly difficult.…”

The choice of Methods of Dynamic Errors Compensation in Motion Control of Elastic Mechatronic Systems

“…At present time the problem of compensation the dynamic errors of mechatronic systems is solved by the methods of machine mechanics associated with the choice of design parameters (inertial, stiffness and dissipative) actuators [7][8][9][10][11], and by the methods of control theory using the purposeful choice of the structure and parameters of the controllers of the electric drive control system [12][13][14][15][16][17][18][19]. The technical solutions proposed in these works are based more on engineering experience and intuition than on a scientific and methodological basis, which would allow formalizing the procedure for the structuralparametric synthesis of controls means the dynamic state of mechatronic systems.…”

Synthesis of the parameters of the elastic-damping device in the excavator’s digging mechanism based on the use of the integral equation

“…Analytical methods of synthesis include methods based on the use of a concept of inverse dynamic problems, which consists in determining the required parameters from given finite or differential equations that ensure the desired nature of controlled motion. This concept was used in the works [14] and [15] to select the EDD parameters of dragline mechanisms based on setting the law of oscillatory motion of the operating mechanism and the form of its differential equation. At the same time, the task of the finite or differential equation of motion requires finding the natural oscillation frequency that limits the possibilities of using this approach.…”

“…The recommended ranges for the optimal combination of parameters of the polynomial (7) Let's investigate the change of the coefficients of the characteristic polynomial (7) at fixed values of the parameters of the digging mechanism [15]:…”