scholarly journals The study of Improvement on Dynamic Characteristics of Position Control System by Viscous Controllable Fluid Damper. 1st Report. Improvement of Dynamic Characteristics of Ball Screw Driving Mechanism by Auxiliary Mass Viscous Damper with Ferro Magnetic Fluid.

1998 ◽  
Vol 64 (618) ◽  
pp. 683-689 ◽  
Author(s):  
Akemi HIGASHIMOTO ◽  
Toshiaki WATANABE ◽  
Yoshiaki KAKINO ◽  
Ziye LI ◽  
Y. NAKANO ◽  
...  
Keyword(s):  
Dynamic Characteristics ◽  
Position Control ◽  
Ball Screw ◽  
Driving Mechanism ◽  
Viscous Damper ◽  
Fluid Damper ◽  
Ferro Magnetic ◽  
Screw Driving ◽  
Position Control System ◽  
Auxiliary Mass

scholarly journals A Simplified Measuring Method of Static and Dynamic Characteristics of Ball-screw Driving Mechanism.

1991 ◽  
Vol 57 (9) ◽  
pp. 1645-1650
Author(s):  
Yoshiaki KAKINO ◽  
Ziye LI ◽  
Fumiya YAGI ◽  
Akemi HIGASHIMOTO ◽  
Toshiaki WATANABE ◽  
...  
Keyword(s):  
Dynamic Characteristics ◽  
Measuring Method ◽  
Ball Screw ◽  
Driving Mechanism ◽  
Static And Dynamic Characteristics ◽  
Screw Driving

The Dynamic Characteristics of an Electro-Hydraulic Servovalve

1976 ◽  
Vol 98 (4) ◽  
pp. 395-406 ◽  
Author(s):  
D. J. Martin ◽  
C. R. Burrows
Keyword(s):  
Control System ◽  
Steady State ◽  
Dynamic Characteristics ◽  
Position Control ◽  
Experimental System ◽  
Second Order ◽  
Frequency Responses ◽  
Model Based ◽  
Valve Model ◽  
Position Control System

The frequency responses of an experimental electro-hydraulic position control system and a simulation of the system are compared. Three different valve models are used in the simulation in an attempt to highlight the important parameters of an electro-hydraulic servovalve. It is found that a second order compensated valve model based on steady-state considerations provides a good correlation with the experimental system up to 35Hz and can be used for stability calculations up to 80Hz.

Trajectory Planning of Knife Position of Slitter Robot Based on Identification of Friction and Viscous Damping, and Position Control Experiments

2008 ◽  
Vol 2 (5) ◽  
pp. 354-359
Author(s):  
Hiroyuki Kojima ◽  
◽  
Daiki Orihara ◽  
Yamato Matsuda ◽  
Yusuke Inoue ◽  
...  
Keyword(s):  
Trajectory Planning ◽  
Position Control ◽  
Planning Method ◽  
Ball Screw ◽  
Driving Mechanism ◽  
Identification Algorithm ◽  
Viscous Damping ◽  
Driving Mechanisms ◽  
Ac Motor ◽  
Planning Algorithm

In this study, the trajectory planning method of the knife position of a slitter robot is proposed, and the experimental and numerical simulation results are demonstrated. The slitter robot consists of upper and lower knife driving mechanisms, and a knife driving mechanism was constructed with a worm gear, a ball screw and an alternating current (AC) motor. In the trajectory planning, first, the identification algorithm of the friction and the viscous damping is derived by using the equation of motion of the knife drive mechanism and the experimental results of the dynamic response with constant AC motor torque. Then, the trajectory planning algorithm of the knife position is presented, and a knife position control system is constructed. Furthermore, the experiments and numerical calculations have been carried out, and the usefulness of the present trajectory planning method is confirmed.

702 Design of Two-degree-of Freedom Control for Ball Screw Driving Mechanism

2005 ◽  
Vol 2005.58 (0) ◽  
pp. 243-244
Author(s):  
Hiroshi HAMAMATSU ◽  
Kohtaro KOYAMA ◽  
Yoshito TANAKA ◽  
Shigeru FUTAMI ◽  
Teruo TSUJI
Keyword(s):  
Degree Of Freedom ◽  
Ball Screw ◽  
Driving Mechanism ◽  
Screw Driving ◽  
Two Degree Of Freedom

High-Precision Tracking Control of Machine Tool Feed Drives Based on ADRC

2016 ◽  
Author(s):  
Chengyong Zhang ◽  
Yaolong Chen
Keyword(s):  
Machine Tool ◽  
High Precision ◽  
Tracking Control ◽  
Position Control ◽  
Feedback System ◽  
Pi Controller ◽  
Ball Screw ◽  
Feed Drives ◽  
Precision Tracking ◽  
Precision Tracking Control

In this paper, the active-disturbance-rejection control (ADRC) is applied to realize the high-precision tracking control of CNC machine tool feed drives. First, according to the number of the feedback channel, the feed systems are divided into two types: signal-feedback system, e.g., linear motor and rotary table, and double-feedback system, e.g., ball screw feed drive with a load/table position feedback. Then, the appropriate controller is designed to ensure the closed-loop control performance of each type of system based on the idea of ADRC. In these control frameworks, the extended state observers (ESO) estimate and compensate for unmodeled dynamics, parameter perturbations, variable cutting load, and other uncertainties. For the signal-feedback system, the modified ADRC with an acceleration feedforward term is used directly to regulate the load/table position response. However, for the double-feedback system, the ADRC is applied only to the motor position control, and a simple PI controller is used to achieve the accurate position control of the load. In addition, based on ADRC feedback linearization, a novel equivalent-error-model based feedforward controller is designed to further improve the command following performance of the double-feedback system. The experimental results demonstrate that the proposed controllers of both systems have better tracking performance and robustness against the external disturbance compared with the conventional P-PI controller.

scholarly journals Dynamic Modeling and Experiment Research on Twin Ball Screw Feed System Considering the Joint Stiffness

Symmetry ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 686 ◽  
Author(s):  
Meng Duan ◽  
Hong Lu ◽  
Xinbao Zhang ◽  
Yongquan Zhang ◽  
Zhangjie Li ◽  
...  
Keyword(s):  
Dynamic Modeling ◽  
Dynamic Characteristics ◽  
Friction Model ◽  
Numerical Control ◽  
Ball Screw ◽  
Cnc Machine Tools ◽  
Axial Stiffness ◽  
Cnc Machine ◽  
Feed System ◽  
Lumped Mass

It is of great significance to study the dynamic characteristics of twin ball screw (TBS) feed system to improve the precision of gantry-type dual-driven computer numerical control (CNC) machine tools. In this paper, an equivalent dynamic model of the TBS feed system is established utilizing lumped mass method considering the stiffness of joints. Equivalent axial stiffness of screw-nut joints and bearing joints are both calculated by Hertz contact theory. Furthermore, a friction model is proposed because the friction force of the screw nut affects the stiffness of the joints. Then, the friction parameters are obtained by using the nonlinear system identification method. Meanwhile, a finite element model (FEM) is developed to assess the dynamic characteristics of TBS feed system under the stiffness of joints. Finally, validation experiments are conducted, and the results show that the positions of the nut and the velocities of worktable greatly affect the dynamic characteristics of the TBS feed system. Compared with the theoretical calculation, FEM and experiments indicate that the dynamic modeling proposed in this article can reach a higher accuracy.

Sign in / Sign up

Export Citation Format

Share Document