The research of the dynamic processes of control system of hydraulic drive of belt conveyors with variable cargo flows

Study of the dynamic stability of the belt conveyor adaptive drive

“…First, the calculation scheme of the control system of the conveyor hydraulic drive ( Fig. 1) was developed for the investigation of dynamic characteristics of its operation [24,31,32]. Then its improvement was carried out at the expense of jointing the calculation model of the transporting part of the belt conveyor, that takes into account elastic-inertia characteristics of small length belt conveyor (Fig.…”

“…In the process of model development the generally accepted assumptions [24] were used, their correctness was proved by the comparison of theoretical results and results of experimental studies of the similar systems [6,33].…”

“…equations (1 -9) such designations are used: М 0moment of forces of useful resistance; р n -pressure in hydraulic supply line of the hydraulic drive; р 1 , р 2 -are pressures of sensor 4 opening and in the cavity of plunger 6, correspondingly; m 1 , m 2 , m 3 -are ball masses of sensor 4, distribution valve 4 and plunger 6, correspondingly; x, y, z -are the coordinates of corresponding masses displacement; k 1 , k 2 , k 3 , x 0 , y 0 , z 0 -are rigidities and initial deformation of the springs, correspondingly; q n ,n n -is characteristic volume of the pump 1 and rotation frequency of its shaft, correspondingly; q m1 , q m2 -is characteristic volume of the hydraulic motor 7 and 8, correspondingly; βis the compliance coefficient with the account of work fluid compressibility; μ -is the discharge coefficient; ρ -is the density of working fluid; f 1 , f 2 , f 3 , f 4 , f 5 -are the contact areas of the fluid with the sensor 4 in the open and close positions and areas in distribution valve 3 ends surfaces and plunger 6, correspondingly; W п , W 1 , W 2 -is the volume of pressure pipe of hydraulic drive , sensor 4 and plunger 6, correspondently; d 1 , d 2 , d 3 -is the diameter of sensor 4 ball, distribution valve 3 and plunger 6, correspondingly; b 1 , b 2 , b 3 -are the viscous damping coefficients for hydraulic drive; F g1 , F g2 -are hydro dynamic forces, acting on the ball of the sensor 4 and distribution valve 3[24]; Fa -is the reaction of half-couplings clutching, І 1 , І 2 , І 3 , І 4 -are the inertia moments of the main 7, additional 8 hydraulic motors, drive 10 and tail 12 drums, correspondingly; φ 1 , φ 2 , φ 3 , φ 4 -are turning angles of the main 7, additional 8 hydraulic motors, drive 10 and tail 12 drums, correspondingly; r 3 , r 4 -are the diameters of drive and tail 12 drums; C f -is the torsional stiffness of the communicator 9; ν f -is the damping of the communicator 9; C s -is the rigidity of the conveyor belt 11; ν s -is the dynamic viscosity of the belt 11; u -is the transfer ratio of the communicator 9; A s -is the area of the belt cross-section; L s -is the length of the belt; Е s -is the static modulus of elasticity of the conveyor belt; Е d -is the dynamic modulus of elasticity of the belt. Calculation were carried out, using such initial values of control system parameter: М up to 12000Nm; М 0 =1200Nm; Е s =510·10 6 MPa; Е d =2400MPa; A s =2·10…”

Experimental research characteristics of counterbalance valve for hydraulic drive control system of mobile machine

“…Simulation modeling [9][10][11][12]18,19,[24][25][26] of hydraulic drive control system of mobile machines by means of program products MAPLE, MATLAB Simulink, ANSYS, Solidworks Flow Simulation, Autodesk Simulation CFD enables to solve complex engineering problems of hydraulic equipment design. Such method of the design is economically efficient and accurate.…”

Application of Hydraulic Automation Equipment for the Efficiency Enhancement of the Operation Elements of the Mobile Machinery

“…The efficiency of the driveoperation is provided [17] applying in it the developed control system with the friction clutch for the switchingof the additional hydraulic motor. To reduce the resistance forces during the start of the addition hydraulic motor the control device of such system operates in such mode: first, with the small time delay the shaft displacement of the additional hydraulic motor occurs, then the friction clutch of the driving gear pinion is activated.…”