Experimental Study of the Direct Drive Hydraulic System with the Torque Mode

Abstract

The torque mode is more suitable for the direct drive 6 degree of freedom (6-DOF) parallel mechanism than the speed mode that both dynamic coupling and current coupling among motors are easily solved, but its key parameters and dynamic characteristics have never been studied, which are important and are the goals of this paper. First the hydraulic system of the direct drive 6-DOF parallel mechanism is simplified. Then the transfer function of the direct drive hydraulic system with the torque mode is deduced together with that of the speed mode. Finally, comparative experiments are conducted. Results show that the dynamic characteristics of the system with the torque mode which are generally worse than those with the speed mode, are mainly determined by the parameters of the motor-pump second-order element of the transfer function composed of two under-damped second-order elements, proportion differentiation (PD) control strategy and dynamic pressure feedback (DPF) control strategy are useful for the system with the torque mode, but practical and effective methods are still needed.

Research and application of adaptive anti-interference based VU-fuzzy-PID algorithm in temperature control system of platic extruder

“…Considering Considering the in-trinsic relationship between the error e and the rate of change of the error ec, let the input variables e and ec The fundamental domains of the input variables e and e c are [-E, E] and [-Ec , Ec] respectively [29], and the fundamental domains of the output var-iables u i are [-U, U]. The fundamental domain of the output variable u i is [-U, U], The variational domain is processed to give equations ( 11), ( 12) and (13).…”

“…Plastic is plasticised into a homogeneous melt by the extrusion system [11,12],By establishing a certain pressure through the screw speed and the head, the melt will be fixed pressure, temperature and Constant volume extrusion head. The function of the drive system is to drive the screw [13,14],Rotates the screw uniformly with a specific torque,The material is plasti-cised and then extruded from the barrel in a certain shape. The heating unit is mainly used to melt and plasticise the plastic by means of a heater, reaching its own viscous flow temperature [15,16].…”

Research and Application of Plastic Extruder Temperature System Based on Variable Universe Fuzzy PID Control

“…Plastic is plasticised into a homogeneous melt by the extrusion system [11,12],By establishing a certain pressure through the screw speed and the head, the melt will be fixed pressure, temperature and Constant volume extrusion head. The function of the drive system is to drive the screw [13,14],Rotates the screw uniformly with a specific torque,The material is plasticised and then extruded from the barrel in a certain shape. The heating unit is mainly used to melt and plasticise the plastic by means of a heater, reaching its own viscous flow temperature [15,16].…”

“…Considering Considering the intrinsic relationship between the error e and the rate of change of the error ec, let the input variables e and ec The fundamental domains of the input variables e and e c are [-E, E] and [-Ec , Ec] respectively [29], and the fundamental domains of the output variables u i are [-U, U]. The fundamental domain of the output variable u i is [-U, U], The variational domain is processed to give equations ( 11), ( 12) and (13).…”